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Newtonsoft.Json.JsonConvert.DeserializeObject 失敗的情況
test...more
dotnet ef dbcontext scaffold
...more
[ASP.NET] 利用 aspnet_regiis 加密 web.config
...more
IIS ARR (reverse proxy) 服務安裝
...more
[錯誤訊息] 請加入 ScriptResourceMapping 命名的 jquery (區分大小寫)
...more
用 Javascript 跨網頁讀取 cookie (Cookie cross page, path of cookie)
...more
線上客服 - MSN
本人信箱被盜用以致資料外洩，是否可以請貴平台予以協助刪除該信箱之使用謝謝囉...more
插入文字到游標或選取處
aaaaa...more
IIS 配合 AD (Active Directory) 認証, 使用 .Net 6.0
太感謝你了~~~你救了我被windows 認證卡了好幾天QQ...more
PostgreSQL 的 monitor trigger
FOR EACH ROW 可能要改為 FOR EACH STATEMENT ...more

標籤

搜尋 write 結果：

網站字型檔跨站CORS問題處理

因為想把同一網站下的靜態檔用另一個 domain 處理
但是 css 如果有設定下載字型檔 .ttf or .woff
就會出現 CORS 問題，其他 js, css，圖片就能正常

為了解決CORS的問題，其實只要 Response Header 要設定 Access-Control-Allow-Origin: *
或是設定特定網站 Access-Control-Allow-Origin: https://www.s3.com.tw

後來發現 IIS 網站可以設定 web.config 設定 response header 解決
當然要先裝一下 urlrewrite 2.0 才可以使用
只針對 font 類型的靜態檔

<configuration>

<system.webServer>

    <rewrite>

     <outboundRules>

        <rule name="Add CORS header for fonts" preCondition="IsFontFile">

         <match serverVariable="RESPONSE_Access-Control-Allow-Origin" pattern=".*" />

         <action type="Rewrite" value="*" />

        </rule>

        <preConditions>

         <preCondition name="IsFontFile">

            <add input="{REQUEST_URI}" pattern="\.woff2$|\.woff$|\.ttf$|\.eot$|\.otf$" />

         </preCondition>

        </preConditions>

     </outboundRules>

    </rewrite>

</system.webServer>

</configuration>

{REQUEST_URI} 也可以改為 {PATH_INFO}

More...

darren, 2026/3/4 下午 05:02:35

AWS SES 建立 SNS 通知

在 powershell 執行以下的指令



# List of SES identities

$identities = @(

    "wztech.com.tw",

    "s3.com.tw",

    "jdcard.com.tw",

    "mskcable.com",

    "uwinfo.com.tw",

    "bike.idv.tw",

    "richwave.com.tw",

    "ctcn.com.tw",

    "jcard.com.tw",

    "bike@bike.idv.tw",

    "ee@ier.org.tw"

)



foreach ($identity in $identities) {

    # Convert identity to a valid topic name by replacing '@' and '.' with '_'

    $safeIdentity = $identity -replace "@", "_" -replace "\.", "_"

    $topicName = "SES_NOTIFY_$safeIdentity"

    $endpoint = "https://working.uwinfo.com.tw/aws/api/sns/receive?topic=$topicName"



    # Validate topic name format

    if ($topicName -notmatch '^[a-zA-Z0-9_\-\$]+$') {

        Write-Host "❌ Invalid topic name: $topicName"

        continue

    }



    # 1. Create SNS topic

    $topicArn = aws sns create-topic `

        --name $topicName `

        --query 'TopicArn' `

        --output text



    Write-Host "✔ Created topic: $topicArn"



    # 2. Subscribe webhook

    aws sns subscribe `

        --topic-arn $topicArn `

        --protocol https `

        --notification-endpoint $endpoint



    Write-Host "✔ Subscribed webhook: $endpoint"



    # 3. Link SES notifications

    foreach ($type in @("Delivery", "Bounce", "Complaint")) {

        aws ses set-identity-notification-topic `

            --identity $identity `

            --notification-type $type `

            --sns-topic $topicArn

        Write-Host "✔ $type linked to $topicName"

    }



    Write-Host "✅ Setup complete for $identity\n"

}



Write-Host "🎉 All identities processed."

收到的 log 會放在這裡: E:\WebBackup\195\ASP.NET Project\working\Data\Log\sns

More...

Bike, 2025/4/16 上午 10:40:39

AWS SES 建立 SNS 通知

在 powershell 執行以下的指令

# List of SES identities
$identities = @(
"wztech.com.tw",
"s3.com.tw",
"jdcard.com.tw",
"mskcable.com",
"uwinfo.com.tw",
"bike.idv.tw",
"richwave.com.tw",
"ctcn.com.tw",
"jcard.com.tw",
"bike@bike.idv.tw",
"ee@ier.org.tw"
)

foreach ($identity in $identities) {
# Convert identity to a valid topic name by replacing '@' and '.' with '_'
$safeIdentity = $identity -replace "@", "_" -replace "\.", "_"
$topicName = "SES_NOTIFY_$safeIdentity"
$endpoint = "https://working.uwinfo.com.tw/aws/api/sns/receive?topic=$topicName"

# Validate topic name format
if ($topicName -notmatch '^[a-zA-Z0-9_\-\$]+$') {
Write-Host "❌ Invalid topic name: $topicName"
continue
}

# 1. Create SNS topic
$topicArn = aws sns create-topic `
--name $topicName `
--query 'TopicArn' `
--output text

Write-Host "✔ Created topic: $topicArn"

# 2. Subscribe webhook
aws sns subscribe `
--topic-arn $topicArn `
--protocol https `
--notification-endpoint $endpoint

Write-Host "✔ Subscribed webhook: $endpoint"

# 3. Link SES notifications
foreach ($type in @("Delivery", "Bounce", "Complaint")) {
aws ses set-identity-notification-topic `
--identity $identity `
--notification-type $type `
--sns-topic $topicArn
Write-Host "✔ $type linked to $topicName"
}

Write-Host "✅ Setup complete for $identity\n"
}

Write-Host "🎉 All identities processed."

--

收到的 log 會放在這裡: E:\WebBackup\195\ASP.NET Project\working\Data\Log\sns

More...

Bike, 2025/4/16 上午 10:40:31

IIS ARR (reverse proxy) 服務安裝

IIS 如果要使用 reverse proxy server 服務，其實網路上已經有很多文章可以參考
這篇文章只是記錄一下安裝上要注意的事

過去安裝 IIS 套件可以透過 Web Platform Installer 搜尋下載
但現在 IIS 的 Web Platform Installer 已經不讓人搜尋下載可安裝的套件
所以要直接去微軟網站找相關套件可以用 IIS ARR 搜尋
https://www.iis.net/downloads/microsoft/application-request-routing
下載 requestRouter_amd64.msi 安裝這個 (3.0版 2021 年以後就沒有更新了)
安裝前，IIS也要預先安裝 URLRewrite 2 套件

安裝很簡單，msi 安裝後，IIS重啟就可以看到
IIS 的主機設定，可以看到 "Application Reuest Routing Cache" --> 點進後右邊有 Server Proxy Settings
proxy 的設定有一些地方要注意一下，避免未來採到雷

首先當然先開啟 Enable proxy，下面針對一些要注意的屬性說明一下

1. Time-out : 預設120秒，如果你後端的站台有一些操作可能超過兩分鐘(例如處理報表)，這個就調長一點
2. Reverse rewrite host in response header: 這個勾勾預設是開的，他的好意是同站台redirect(302) 到其他網頁，可以覆蓋
host 讓 client端能跑到正常的網址。但如果你是 redirect 到其他站台，建議把它關掉，不然後端網站如果下
redirect (302) 到別的站台，他會主動把 redirect網址 host 改為本站 (被雷過，所以要特別記下來)
3. Include TCP port from client IP: 這是一個 X-Forwarded-For 設定，預設是打開，這樣後端主機抓 client 來源 IP就會類似
"112.121.100.100:443" ，但後端網站在抓 client端IP通常不會管 port number，因此就會造成比對 IP 發生錯誤
所以建議還是把它關閉
4. Enable disk cache: 預設是勾勾打開，如果後端是靜態網站，例如圖片server，這個打開沒有問題，但如果後端網站是動態網站
那還是關掉

More...

darren, 2025/1/10 上午 11:01:38

Chrome 連接藍芽 BLE 印表機(出單機)，使用 ESC / POS 列印繁體中文和 Qrcode

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <title>BLE Printer Test</title>

    <script src="https://cdn.jsdelivr.net/npm/iconv-lite-umd@0.6.10/lib/iconv-lite-umd.js"></script>

</head>

<body>

    <h1>BLE Printer Test 123</h1>

    <button id="printTestButton">Test Print</button>

    <button id="printAgain">Print Again</button>

    <pre id="log"></pre>

    <script>

        // Function to log messages on the page

        function logMessage(message) {

            const logElement = document.getElementById('log');

            logElement.textContent += message + '\n';

        }

        var device;

        var server;

        var service;

        var characteristic;

        var name = 'T58_6752'; // 藍芽設備的名稱

        var uuid = 0x1800; //service UUID (用 BLE Scanner 找到的)

        var characteristicUuid = 0x2A00; // characteristic UUID (用 BLE Scanner 找到的)

        // Function to connect to BLE printer and send test data



        async function connectAndTestPrint() {



            try {

                logMessage("Requesting Bluetooth device...");



                // Request the BLE device

                device = await navigator.bluetooth.requestDevice({

                    //acceptAllDevices: true,

                    filters: [

                        { name: name }

                    ],

                    optionalServices: [uuid] // Replace with the correct service UUID

                });



                logMessage(`Device selected: ${device.name}`);

                logMessage(`Device uuid: ${device.id}`);



                await printAgain();





            } catch (error) {

                logMessage(`Error: ${error.message}`);

            }

        }



        // 转码方法

        function stringToGbk(str) {

            const ranges = [

                [0xA1, 0xA9, 0xA1, 0xFE],

                [0xB0, 0xF7, 0xA1, 0xFE],

                [0x81, 0xA0, 0x40, 0xFE],

                [0xAA, 0xFE, 0x40, 0xA0],

                [0xA8, 0xA9, 0x40, 0xA0],

                [0xAA, 0xAF, 0xA1, 0xFE],

                [0xF8, 0xFE, 0xA1, 0xFE],

                [0xA1, 0xA7, 0x40, 0xA0],

            ]

            const codes = new Uint16Array(23940)

            let i = 0



            for (const [b1Begin, b1End, b2Begin, b2End] of ranges) {

                for (let b2 = b2Begin; b2 <= b2End; b2++) {

                    if (b2 !== 0x7F) {

                        for (let b1 = b1Begin; b1 <= b1End; b1++) {

                            codes[i++] = b2 << 8 | b1

                        }

                    }

                }

            }

            const cstr = new TextDecoder('gbk').decode(codes)



            // 编码表

            const table = new Uint16Array(65536)

            for (let i = 0; i < cstr.length; i++) {

                table[cstr.charCodeAt(i)] = codes[i]

            }

            const buf = new Uint8Array(str.length * 2)

            let n = 0



            for (let i = 0; i < str.length; i++) {

                const code = str.charCodeAt(i)

                if (code < 0x80) {

                    buf[n++] = code

                } else {

                    const gbk = table[code]

                    buf[n++] = gbk & 0xFF

                    buf[n++] = gbk >> 8

                }

            }

            u8buf = buf.subarray(0, n)

            // console.log(u8buf);

            return u8buf

        }



        async function printAgain() {

            // Connect to the GATT server

            server = await device.gatt.connect();

            logMessage("Connected to GATT server.");



            // Get the printer service

            service = await server.getPrimaryService(uuid); // Replace with your printer's service UUID

            logMessage("Printer service retrieved.");



            // Get the characteristic for writing data

            characteristic = await service.getCharacteristic(characteristicUuid); // Replace with the correct characteristic UUID

            logMessage("Printer characteristic retrieved.");



            // Prepare test print data

            const encoder = new TextEncoder();

            const testData = encoder.encode("TEST PRINT: Hello from Web Bluetooth!\n");

            const finalData = encoder.encode("--\n--\n \n \n");



            const setFontSize = new Uint8Array([0x1D, 0x21, 0x11]); // GS ! n

            const setFontSize2 = new Uint8Array([0x1D, 0x21, 0x22]); // GS ! n

            const setFontSize3 = new Uint8Array([0x1D, 0x21, 0x33]); // GS ! n



            // Write test data to the printer

            logMessage("Sending test data to printer...");



            await characteristic.writeValue(new Uint8Array([0x1D, 0x21, 0x00]));

            await characteristic.writeValue(encoder.encode("1x1!\n"));

            await characteristic.writeValue(setFontSize);

            await characteristic.writeValue(encoder.encode("2x2!\n"));

            await characteristic.writeValue(setFontSize2);

            await characteristic.writeValue(encoder.encode("3x3!\n"));

            await characteristic.writeValue(setFontSize3);

            await characteristic.writeValue(encoder.encode("4x4!\n"));





            const initPrinter = new Uint8Array([0x1B, 0x40]); // ESC @

            await characteristic.writeValue(initPrinter);



            // 3. 設置字符集為 GBK

            const setGBK = new Uint8Array([0x1B, 0x74, 0x11]); // ESC t 0x11 (GBK)

            await characteristic.writeValue(setGBK);



            const text = "繁體中文測試\n \n";

            const encodedText = stringToGbk(text);

            await characteristic.writeValue(encodedText);

            logMessage("Test data sent successfully!");



            // QrCode 列印

            const qrData = "https://example.com"; // Your QR code data

            const qrDataLength = qrData.length + 3;

            const pL = qrDataLength & 0xFF; // Low byte

            const pH = (qrDataLength >> 8) & 0xFF; // High byte



            const commands = [

                0x1B, 0x40, // Initialize printer

                0x1D, 0x28, 0x6B, pL, pH, 0x31, 0x50, 0x30, ...new TextEncoder().encode(qrData), // Store data

                0x1D, 0x28, 0x6B, 0x03, 0x00, 0x31, 0x51, 0x30 // Print QR code

            ];



            const buffer = new Uint8Array(commands);

            await characteristic.writeValue(buffer);

            logMessage("QrCode sent successfully!");



            await characteristic.writeValue(finalData);

            logMessage("finalData sent successfully!");



            // Disconnect the GATT server

            server.disconnect();

            logMessage("Disconnected from printer.");

        }



        // Bind the function to the button

        document.getElementById('printTestButton').addEventListener('click', connectAndTestPrint);

        document.getElementById('printAgain').addEventListener('click', printAgain);

    </script>

</body>

</html>

More...

Bike, 2025/1/2 下午 02:20:15

查詢所有執行中的 SQL (mssql) keyword: 長時間, 總時間

用以下指令可以對 Ms-SQL Server 查出所有正在執行的 SQL 指令，並且依執行總時間反向排序

SELECT      r.scheduler_id as 排程器識別碼,

            status         as 要求的狀態,

            r.session_id   as SPID,

            r.blocking_session_id as BlkBy,

            substring(

                ltrim(q.text),

                r.statement_start_offset/2+1,

                (CASE

                 WHEN r.statement_end_offset = -1

                 THEN LEN(CONVERT(nvarchar(MAX), q.text)) * 2

                 ELSE r.statement_end_offset

                 END - r.statement_start_offset)/2)

                 AS [正在執行的 T-SQL 命令],

            r.cpu_time      as [CPU Time(ms)],

            r.start_time    as [開始時間],

            r.total_elapsed_time as [執行總時間],

            r.reads              as [讀取數],

            r.writes             as [寫入數],

            r.logical_reads      as [邏輯讀取數],

            -- q.text, /* 完整的 T-SQL 指令碼 */

            d.name               as [資料庫名稱]

FROM        sys.dm_exec_requests r 

            CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS q

            LEFT JOIN sys.databases d ON (r.database_id=d.database_id)

WHERE       r.session_id <> @@SPID

ORDER BY    r.total_elapsed_time desc

More...

Bike, 2024/12/2 下午 04:44:39

AddPath優化

改寫成可輸入多參數，效能也比較好的版本。
以下為測試碼，請自行依照專案需求做修改。

var root = "C://wdqd/qwewq";

var addPath = @"//\\/fwef/qwf";

var addPath2 = @"5fwfef/qwf";

var addPath3 = @"//fwef/qwf";

var addPath4 = @"\\\fwef/qwf";

var addPath5 = @"\\\\\/fwef/qwf";





var result = root.AddPath(addPath, addPath2, addPath3, addPath4, addPath5);



Console.WriteLine(result);



public static class Helper

{

    public static string AddPath(this string value, params string[] addPaths)

    {

        if (string.IsNullOrEmpty(value))

        {

            throw new Exception("起始目錄不可以為空字串");

        }



        if (value.Contains("..") || addPaths.Any(x => x.Contains("..")))

        {

            throw new Exception($"value: {value}, addPaths: {addPaths.Where(x => x.Contains("..")).ToOneString()} 檔名與路徑不可包含 ..");

        }



        var paths = addPaths.Select(x => x.Substring(x.FindLastContinuousCharPosition('/', '\\') + 1).SafeFilename()).ToList();



        if (paths.Any(x => System.IO.Path.IsPathRooted(x)))

        {

            throw new Exception("不可併入完整路徑 ..");

        }



        paths.Insert(0, value.SafeFilename());



        return System.IO.Path.Combine(paths.ToArray());

    }



    public static string ToOneString<T>(this IEnumerable<T> list, string separator = ",")

    {

        var strList = list.Select(x => x.ToString());

        return string.Join(separator, strList);

    }



    public static int FindLastContinuousCharPosition(this string input, params char[] targets)

    {

        int lastPosition = -1;



        for (int i = 0; i < input.Length; i++)

        {

            if (targets.Contains(input[i]))

            {

                lastPosition = i;

            }

            else

            {

                break;

            }

        }



        return lastPosition;

    }



    public static string SafeFilename(this string value)

    {

        return GetValidFilename(value);

    }



    public static string GetValidFilename(string value)

    {

        string ValidFilenameCharacters = @"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\-_$.@:/# ";

        if (value.Contains(".."))

        {

            throw new Exception("路徑中不可包含 .. ");

        }



        string newUrl = "";

        for (int i = 0; i < value.Length; i++)

        {

            var c = value.Substring(i, 1);

            int k = ValidFilenameCharacters.IndexOf(c);

            if (k < 0)

            {

                throw new Exception($"檔名 '{value}' 中有非法的字元 '" + c + "'。");

            }

            newUrl += ValidFilenameCharacters.Substring(k, 1);

        }



        return newUrl;

    }

}

More...

梨子, 2023/8/28 上午 09:43:49

.Net Framework 的檔案檢查機制 Web API 和 MVC 5

我們的目標是在啟動時，掛一個 global filter 來檢查上傳的檔案附檔名，避免上傳未預期的可執行檔。使用 global filter 可以防止程式設計師忘了做檔案檢查，發生危險。我們目前用到的 .Net Framework 有兩個類別，一個是 System.Web.Http.ApiController，另一個是 System.Web.Mvc.Controller，兩個要分開處理。

1. Web API (System.Web.Http.ApiController)
.Net Framework 的 Web API 2 在接收檔案時，必需使用 Request.Content.ReadAsMultipartAsync 把上傳的資料存入 MultipartMemoryStreamProvider 之後再來處理。
範例如下:

    public class UploadController : ApiController

    {

        public async Task<object> PostFormData()

        {

            var provider = new MultipartMemoryStreamProvider();



            if (! Request.Content.IsMimeMultipartContent())

            {

                return "no file";

            }



            //要注意這裡的 await

            await Request.Content.ReadAsMultipartAsync(provider);



            foreach (var content in provider.Contents)

            {

                if (content.Headers.ContentDisposition.FileName != null)

                {

                    string localFilename = content.Headers.ContentDisposition.FileName.Replace("\"", "");

                    System.IO.Directory.CreateDirectory(HttpContext.Current.Server.MapPath(@"~/App_Data/Temp/"));

                    string filename = HttpContext.Current.Server.MapPath(@"~/App_Data/Temp/" + localFilename);

                    if (System.IO.File.Exists(filename))

                    {

                        System.IO.File.Delete(filename);

                    }



                    using (var fileStream = new FileStream(filename, FileMode.Create, FileAccess.Write))

                    {

                        var contentStream = await content.ReadAsStreamAsync();

                        await contentStream.CopyToAsync(fileStream);

                        Trace.WriteLine("Save To" + filename);

                    }

                }

            }

            return "OK";

        }

    }

程式碼中有個地方我沒有注意到。我一開始是用 Request.Content.ReadAsMultipartAsync(provider); 把資料讀進 provider，但前方沒有加上 await，造成有時讀不到檔案的情況，再次提醒自己 Async 和 Await 的關係。

直覺的想法是在 filter 中執行一樣的程式碼，不存檔，只要抓出檔名來檢查即可。但這時遇到一個問題 Request.Content.ReadAsMultipartAsync 不能執行兩次，Google 了一陣子，也沒找不到類似 seek(0) 的操作。所以只好自己寫一個暫存的機製。

這裡決定使用 System.Web.HttpContext.Current.Items 來暫存 provider，最後的 OnActionExecutingAsync 結果如下:

        /// <summary>

        /// 檔案檢查

        /// </summary>

        /// <param name="actionContext"></param>

        /// <param name="cancellationToken"></param>

        /// <returns></returns>

        public override async Task OnActionExecutingAsync(HttpActionContext actionContext, CancellationToken cancellationToken)

        {

            Trace.WriteLine("ApiCheckFile OnActionExecutingAsync");



            var request = actionContext.Request;

            if (!request.Content.IsMimeMultipartContent())

            {

                return;

            }



            var provider = new MultipartMemoryStreamProvider();

            await request.Content.ReadAsMultipartAsync(provider);



            //把 provider 存入 System.Web.HttpContext.Current.Items 之中，以便在 controller 中再度使用

            System.Web.HttpContext.Current.Items["MimeMultipartContentProvider"] = provider;



            foreach (var content in provider.Contents)

            {

                if (content.Headers.ContentDisposition.FileName != null)

                {

                    var filename = content.Headers.ContentDisposition.FileName.Replace("\"", "");

                    Trace.WriteLine(filename);



                    var ext = System.IO.Path.GetExtension(filename);

                    if (!".jpg,.jpeg,.png".Contains(ext.ToLower()))

                    {

                        throw new Exception("file format error.");

                    }

                }

            }



            return;

        }

而 controller 中的 Action 則改為以下的版本；本版本中，除了把上傳的檔案存檔以外，還有讀取 form data 中其它欄位的範例:

        public async Task<object> PostFormData()

        {

            //改由 HttpContext.Current.Items 中，讀取資料。

            MultipartMemoryStreamProvider provider = (MultipartMemoryStreamProvider)System.Web.HttpContext.Current.Items["MimeMultipartContentProvider"];



            //如果沒有經過 filter，provider會是 null, 這時就要直接由 Request.Content 讀入 provider

            if (provider == null)

            {

                provider = new MultipartMemoryStreamProvider();

                Request.Content.ReadAsMultipartAsync(provider);

            }



            foreach (var content in provider.Contents)

            {

                if (content.Headers.ContentDisposition.FileName != null)

                {

                    string localFilename = content.Headers.ContentDisposition.FileName.Replace("\"", "");

                    Trace.WriteLine("FileName: " + localFilename);

                    Trace.WriteLine("FileName: " + @"~/App_Data/Temp/" + localFilename);

                    System.IO.Directory.CreateDirectory(HttpContext.Current.Server.MapPath(@"~/App_Data/Temp/"));

                    string filename = HttpContext.Current.Server.MapPath(@"~/App_Data/Temp/" + localFilename);

                    if (System.IO.File.Exists(filename))

                    {

                        System.IO.File.Delete(filename);

                    }



                    using (var fileStream = new FileStream(filename, FileMode.Create, FileAccess.Write))

                    {

                        var contentStream = await content.ReadAsStreamAsync();

                        await contentStream.CopyToAsync(fileStream);

                        Trace.WriteLine("Save To" + filename);

                    }

                }

                else

                {

                    var contentStream = await content.ReadAsStreamAsync();

                    var reader = new System.IO.StreamReader(contentStream);

                    var data = reader.ReadToEnd();

                    Trace.WriteLine("data: " + data);

                }

            }

            return "OK";

        }

以上是展示 Web Api 的 Filter。

如果是 MVC 的 Controller，就簡單多了，直接讀取 actionContext.HttpContext.Request.Files 裡面各檔案的 FileName 即可。不過也遇到了一個和直覺不同的地方，對 actionContext.HttpContext.Request.Files 居然不能用 foreach 請見下方註解掉的地方。也許是我的用法有問題，如果有人找到可以使用的方法也麻煩告知。

        public override void OnActionExecuting(ActionExecutingContext actionContext)

        {

            Debug.WriteLine("MvcCheckFileFilter OnActionExecuting");

            if (actionContext.HttpContext.Request.Files.Count > 0)

            {

                for (int i = 0; i < actionContext.HttpContext.Request.Files.Count; i++)

                {

                    System.Web.HttpPostedFileBase file = actionContext.HttpContext.Request.Files[i];

                    if (System.IO.Path.GetExtension(file.FileName) != ".jpg")

                    {

                        throw new Exception("file format error.");

                    }

                    Debug.WriteLine(i + "MvcCheckFileFilter OnActionExecuting File type: " + file.FileName.ToString());

                }

            }



            //以下寫法會發生錯誤: 無法將類型 'System.String' 的物件轉換為類型 'System.Web.HttpPostedFileBase'。

            //foreach (HttpPostedFileBase file in actionContext.HttpContext.Request.Files)

            //{

            //    if (System.IO.Path.GetExtension(file.FileName) != ".jpg")

            //    {

            //        throw new Exception("file format error.");

            //    }

            //}

        }

最後是把 filter 掛在 global filter 裡，如下:
Web API Controller 的部份:
在 WebApiConfig.cs 裡加上 config.Filters.Add(new ApiCheckFile()); 見下圖:

附帶一提，Register 是在 global.asax 裡被叫用的。微軟的架構常常這樣，硬是拉到另一個目錄的獨立檔案裡，如果 global.asax 沒有這一行，不知所以的人，在 App_Start 裡，建立了一個 WebApiConfig.cs 然後會發現完全沒做用... 見下圖

MVC Controller 的部份，
在 FilterConfig.cs 中，加上 filters.Add(new MvcCheckFileFilter()); 如下圖

一樣是在 global.asax 中呼叫 FilterConfig.RegisterGlobalFilters，見下圖:

不過有趣的地方是，在 global.asax 裡, WebApiConfig.Register 和 FilterConfig.RegisterGlobalFilters 的叫用方法不同，一個是把 function 當作變數，一個是直接呼叫 function, 大家可以比較一下。

附註 1, 關於 OnActionExecutingAsync 和 OnActionExecuting:

Web API 的 filter 中，提供了 OnActionExecutingAsync 和 OnActionExecuting 兩個 method 可以 override ，我實驗的結果是如果兩個 method 都 override 了，只有 OnActionExecutingAsync 會被呼叫。

MVC 的 filter 中，只有 OnActionExecuting 可以 override。

More...

Bike, 2022/5/15 上午 10:01:11

C# Regular Expression 的 \w

最近發生 email 有人輸入中文可以過的狀況。測試後才發現 \w 在 C# 可以輸入中文驗證過

        string strPattern = @"^[\w\.-]{1,}@[a-zA-Z0-9][\w\.-]*\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$";

        System.Text.RegularExpressions.Regex regEx = new System.Text.RegularExpressions.Regex(strPattern);

        string email = "darrenTEST@gmail.com";

        Response.Write(email + " - > " + regEx.IsMatch(email) + "<br/>");

        email = "darren_東@gmail.com";

        Response.Write(email + " - > " + regEx.IsMatch(email) + "<br/>");



// darrenTEST@gmail.com - > True

// darren_東@gmail.com - > True

把 \w 換成 A-Za-z0-9_ 就可以驗證過

string strPattern = @"^[a-zA-Z0-9_\.-]{1,}@[a-zA-Z0-9][\w\.-]*\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$";

        System.Text.RegularExpressions.Regex regEx = new System.Text.RegularExpressions.Regex(strPattern);

        string email = "darrenTEST@gmail.com";

        Response.Write(email + " - > " + regEx.IsMatch(email) + "<br/>");

        email = "darren_東@gmail.com";

        Response.Write(email + " - > " + regEx.IsMatch(email) + "<br/>");



// darrenTEST@gmail.com - > True

// darren_東@gmail.com - > False

可是搬到 js 處理，就可以過

        const regex = /^[\w\.-]{1,}@[a-zA-Z0-9][\w\.-]*\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$/;

        console.log(regex.test('darrenTEST@gmail.com')); // true

        console.log(regex.test('darren_東@gmail.com')); // false

我想這是 C# 把 \w 當作 [word] 處理的關係，非符號都當作是文字
其他程式語言沒有測試過。不知是不是 c# 獨有的狀況

More...

darren, 2022/4/27 上午 09:29:25

使用Lucene.Net達成全文檢索！基礎解說(二)

上一集當中我們完成了Lucene基本操作中的Create與Read，這一集會將CRUD中的Update與Delete的操作方法告訴你，並且本集會著重於講解關於"Norms"與權重(Boost)在Lucene中的運作概念。

首先我們建立一個.Net 6的主控台應用程式

建立好後於右側專案右鍵選擇"管理Nuget套件"，並選擇"瀏覽">於搜索列中搜尋"Lucene">安裝3.0.3最新穩定版與 "System.Configuration.ConfigurationManager"

安裝好後就可以於專案內使用Lucene套件囉!
再來依照上一篇的教學建立一套簡單的Lucene查詢

using Lucene.Net.Analysis.Standard;

using Lucene.Net.Documents;

using Lucene.Net.Index;

using Lucene.Net.QueryParsers;

using Lucene.Net.Search;

using Lucene.Net.Store;



var _dir = new DirectoryInfo("LuceneDocument");

if (!File.Exists(_dir.FullName))

{

    System.IO.Directory.CreateDirectory(_dir.FullName);

}

var analyzer = new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_CURRENT);

CreateIndex(GetProductsInformation(), _dir, analyzer);



while (true)

{

    Console.Write("請輸入欲查詢字串 :");

    var searchValue = Console.ReadLine();

    Search(searchValue, _dir, analyzer);

}



void CreateIndex(List<Product> information, DirectoryInfo dir, StandardAnalyzer analyzer)

{

    using (var directory = FSDirectory.Open(dir))

    {

        using (var indexWriter = new IndexWriter(directory, analyzer, true, IndexWriter.MaxFieldLength.LIMITED))

        {

            foreach (var index in information)

            {

                var document = new Document();

                document.Add(new Field("Id", index.Id.ToString(), Field.Store.YES, Field.Index.NO));

                document.Add(new Field("Name", index.Name, Field.Store.YES, Field.Index.ANALYZED));

                document.Add(new Field("Description", index.Description, Field.Store.YES, Field.Index.ANALYZED));

                indexWriter.AddDocument(document);

            }

            indexWriter.Optimize();

            indexWriter.Commit();

        }

    }

}

void Search(string searchValue, DirectoryInfo dir, StandardAnalyzer analyzer)

{

    using (var directory = FSDirectory.Open(_dir))

    {

        var parser = new QueryParser(Lucene.Net.Util.Version.LUCENE_CURRENT, "Description", analyzer).Parse(searchValue);

        using (var indexSearcher = new IndexSearcher(directory))

        {

            var queryLimit = 20;

            var hits = indexSearcher.Search(parser, queryLimit);

            if (!hits.ScoreDocs.Any())

            {

                Console.WriteLine("查無相關結果。");

                return;

            }

            Document doc;

            foreach (var hit in hits.ScoreDocs)

            {

                doc = indexSearcher.Doc(hit.Doc);

                Console.WriteLine("Score :" + hit.Score + ", Id :" + doc.Get("Id") + ", Name :" + doc.Get("Name") + ", Description :" + doc.Get("Description"));

            }

        }

    }

}



List<Product> GetProductsInformation()

{

    return new List<Product> {

            new Product{ Id = 1, Name = "蘋果", Description = "一天一蘋果，醫生遠離我。"},

            new Product{ Id = 2, Name = "橘子", Description = "醫生給娜美最珍貴的寶藏。"},

            new Product{ Id = 3, Name = "梨子", Description = "我是梨子，比蘋果好吃多囉!"},

            new Product{ Id = 4, Name = "葡萄", Description = "吃葡萄不吐葡萄皮，不吃葡萄倒吐葡萄皮"},

            new Product{ Id = 5, Name = "榴槤", Description = "水果界的珍寶!好吃一直吃。"}

        };

}

class Product

{

    public long Id { get; set; }

    public string Name { get; set; } = null!;

    public string Description { get; set; } = null!;

}

好囉! 接下來我們要如何更新索引呢?
更新其實就是將存在的索引刪除並重新建立Document，不存在的則直接新增。
首先準備一組資料準備更新

List<Product> GetUpdateProductsInformation()

{

    return new List<Product>

    {

        new Product{ Id = 6, Name = "香蕉", Description = "運動完後吃根香蕉補充養分。"},

        new Product{ Id = 2, Name = "橘子", Description = "橘子跟柳丁你分得出來嗎?"}

    };

}

*欲更新的Document必須與創建所引時使用的Document欄位相同*

void Update(string key, List<Product> information, DirectoryInfo dir, StandardAnalyzer analyzer)

{

    using( var directory = FSDirectory.Open(dir))

    {

        using(var indexWriter = new IndexWriter(directory, analyzer, false, IndexWriter.MaxFieldLength.LIMITED))

        {

            foreach (var index in information)

            {

                var document = new Document();

                document.Add(new Field("Id", index.Id.ToString(), Field.Store.YES, Field.Index.NO));

                document.Add(new Field("Name", index.Name, Field.Store.YES, Field.Index.ANALYZED));

                document.Add(new Field("Description", index.Description, Field.Store.YES, Field.Index.ANALYZED));

                indexWriter.UpdateDocument(new Term("Name", key) ,document);

            }

        }

    }

}

來測試看看

可以看見 Name = 橘子的索引已經改為我們新準備的資料囉。
再來是刪除!
與更新非常相似，只需要使用deleteDocument()就可以了。

void Delete(string key, DirectoryInfo dir, StandardAnalyzer analyzer)

{

    using (var directory = FSDirectory.Open(dir))

    {

        using (var indexWriter = new IndexWriter(directory, analyzer, false, IndexWriter.MaxFieldLength.LIMITED))

        {

            indexWriter.DeleteDocuments(new Term("Name", key));

            indexWriter.Optimize();

            indexWriter.Commit();

        }

    }

}

再來看看輸出結果
可以發現 Score :0.7554128, Id :2, Name :橘子, Description :醫生給娜美最珍貴的寶藏。這筆索引已經被移除囉!

可以發現筆者於更新或刪除時都是輸入單一字來做異動，除了表達可以對索引做複合更動外，
是因為更新與刪除索引同樣會使用到分詞器(analyzer)，
*所輸入的索引值非ID等數值時必須要配合分詞器的分詞能力*才能取得所想異動的索引喔!

Boost是什麼呢?
Boost 分為 :
1. Index Time Boost : 在建立索引時就計算好的值。例如上一篇中提到的(NORMS)
2. Query Time Boost : 查詢時賦與搜尋條件不同的值以影響結果。
我們先來測試Index Time Boost的部分

void CreateIndexWithBoost(List<Product> information, DirectoryInfo dir, StandardAnalyzer analyzer)

{

    using (var directory = FSDirectory.Open(dir))

    {

        using (var indexWriter = new IndexWriter(directory, analyzer, true, IndexWriter.MaxFieldLength.LIMITED))

        {

            foreach (var index in information)

            {

                var document = new Document();

                document.Add(new Field("Id", index.Id.ToString(), Field.Store.YES, Field.Index.NO));

                document.Add(new Field("Name", index.Name, Field.Store.YES, Field.Index.ANALYZED));

                document.Add(new Field("Description", index.Description, Field.Store.YES, Field.Index.ANALYZED));

                document.GetField("Name").Boost = 1.5F;

                document.GetField("Description").Boost = 0.5F;



                indexWriter.AddDocument(document);

            }

            indexWriter.Optimize();

            indexWriter.Commit();

        }

    }

}

並記得重新CreateIndex才能刷新欄位的權重值喔。

很明顯的搜尋出來的Score分數變動了! 但是有沒有發現明明Name欄位的Boost改成了1.5，蘋果的數值卻仍然只有一半呢?
這是因為我們的Search中所參照的欄位為Description，所以在計算Score的時候其實是完全沒有參與的喔!
另外要記得，使用Index Time Boost的時候，欲給予銓重分配的欄位Field.Index不能使用NO_NORMS，不然這個欄位並不會紀錄權重的資料。

再來我們試試看Query Time Boost

void SearchWithBoost(string searchValue, DirectoryInfo dir, StandardAnalyzer analyzer)

{

    using (var directory = FSDirectory.Open(_dir))

    {

        using (var indexSearcher = new IndexSearcher(directory))

        {

            var query = new QueryParser(Lucene.Net.Util.Version.LUCENE_CURRENT, "Name", analyzer).Parse(searchValue);

            var query2 = new QueryParser(Lucene.Net.Util.Version.LUCENE_CURRENT, "Description", analyzer).Parse(searchValue);



            query.Boost = 2.0F;

            query2.Boost = 0.5F;



            BooleanQuery booleanQuery = new BooleanQuery();

            booleanQuery.Add(query, Occur.SHOULD);

            booleanQuery.Add(query2, Occur.SHOULD);



            var hits = indexSearcher.Search(booleanQuery, 20);

            if (!hits.ScoreDocs.Any())

            {

                Console.WriteLine("查無相關結果。");

                return;

            }

            Document doc;

            foreach (var hit in hits.ScoreDocs)

            {

                doc = indexSearcher.Doc(hit.Doc);

                Console.WriteLine("Score :" + hit.Score + ", Id :" + doc.Get("Id") + ", Name :" + doc.Get("Name") + ", Description :" + doc.Get("Description"));

            }

        }

    }

}

這次我們搜尋兩個欄位"Name"與"Description"，並使用 BooleanQuery來將其組合。
BooleanQuery中的 Occur有三種參數 : "MUST","MUST_NOT","SHOULD"，功能與字面上的意思一樣為"必須要有","必須沒有"與"有無都包含"。

查詢出來的分數就不一樣囉!

以上就是這一次的分享，Lucene是一款容易入門但是要實際上戰場卻又十分複雜的功能，想要達成真正高效能的全文檢索，在前期的文件規畫配置與資料的權重配比都是一個巨大的挑戰。未來會繼續分享關於Lucene的其他有趣功能，還請繼續期待呦!
另外也可以到GitHub下載我的範例來參考呦!
GitHub: https://github.com/g13579112000/Lucene

參考文件:
1. 黑暗大大的全文檢索筆記 : https://blog.darkthread.net/blog/lucene-net-notes-1/
2. Makble : http://makble.com/lucene-field-boost-example
3. CSDN Jack2013tong 文章 : https://blog.csdn.net/huwei2003/article/details/53408388

More...

梨子, 2022/4/20 下午 09:34:03