試了這兩個 Sample:

https://learn.microsoft.com/en-us/training/modules/store-local-data/4-exercise-store-data-locally-with-sqlite

和 

https://blazorhelpwebsite.com/ViewBlogPost/61

結果專案在 Windows 環境下都可以正常執行，但切換到 Android Emulator 就無法存檔。

在查了很多資料後，發現需要裝額外的 Package，需安裝的 Package 如下:

    <ItemGroup>

     <PackageReference Include="sqlite-net-pcl" Version="1.8.116" />

     <PackageReference Include="SQLiteNetExtensions.Async" Version="2.1.0" />

     <PackageReference Include="SQLitePCLRaw.bundle_green" Version="2.1.4" />

     <PackageReference Include="SQLitePCLRaw.core" Version="2.1.4" />

     <PackageReference Include="SQLitePCLRaw.lib.e_sqlite3" Version="2.1.4" />

     <PackageReference Include="SQLitePCLRaw.provider.dynamic_cdecl" Version="2.1.4" />

     <PackageReference Include="System.Data.DataSetExtensions" Version="4.5.0" />

    </ItemGroup>

其它的發現為:
1. 雙點專案，就可以開啟 csproj 檔案。下方的 ItemGroup 就是已安裝的 package

2. 可以把 chrome 連接到 Android Emulator 的方法，在網址列輸入以下指令:
chrome://inspect/#devices

HttpWebRequest vs HttpClient httpClient

Post File
Token
Cookie
檔案不落地

以下的程式碼不能縮寫: 
var oldFilename = content.Headers.ContentDisposition.FileName.Trim('\"');
            var contentStream = await content.ReadAsStreamAsync();

            return await PostFile(url, inputName, contentStream, oldFilename,
                authorizationToken, IsAddIpHeaders);
        }

FtpWebRequest類別沒有提供移動檔案的命令，但是可以透過WebRequestMethods.Ftp.Rename達成相同效果的功能。

    FtpWebRequest ftp_Request = null/* TODO Change to default(_) if this is not a reference type */;
    FtpWebResponse ftp_Response = null/* TODO Change to default(_) if this is not a reference type */;
    string str_FtpAct = "XXX";
    string str_FtpPwd = "XXX";

    // Try to create backup folder. If folder already created, resume to backup. 
    try
    {
        ftp_Request = (FtpWebRequest)WebRequest.Create("D:/testfolder/backup");
        ftp_Request.Credentials = new NetworkCredential(str_FtpAct, str_FtpPwd);
        ftp_Request.Method = WebRequestMethods.Ftp.MakeDirectory;
        ftp_Response = ftp_Request.GetResponse();
    }
    catch (WebException ex_Web)
    {
        FtpWebResponse ftp_ResponseEx = ex_Web.Response;
        int int_ErrCode = ftp_ResponseEx.StatusCode;
        // 550: Access is denied, means directory already exist
        if (int_ErrCode != 550)
            Console.WriteLine("Create Folder Failed!");
    }

    try
    {
        ftp_Request = (FtpWebRequest)WebRequest.Create("D:/testfolder/test.txt");
        ftp_Request.Credentials = new NetworkCredential(str_FtpAct, str_FtpPwd);
        ftp_Request.Method = WebRequestMethods.Ftp.Rename;
        ftp_Request.RenameTo = "../testfolder/backup/test.txt";
        ftp_Response = (FtpWebResponse)ftp_Request.GetResponse();
    }
    catch (WebException webex)
    {
        // Get FTP Error code and exception status
        FtpWebResponse ftp_ResponseEx = webex.Response;
        int int_FtpCode = ftp_ResponseEx.StatusCode;
         // Do something
    }


    finally
    {
        if (ftp_Response != null)
            ftp_Response.Close();
    }

LINE Pay款流程： 
reserve Page(紅科) 發送 reserve API => 取得 payment URL => 轉址到 payment URL => LINE Pay 檢查USER狀態 => 轉回confirm page(紅科), 發送 confirm API => DOWN.

付款需要程式： 
reserve API, confirm API:

send request JSON and read return JSON:
C#: 

using System.Net;

using System.IO;



public partial class TEST : System.Web.UI.Page

{

    DB.OrderMain oOrderObj = null;

    protected void Page_Load(object sender, EventArgs e)

    {

        //Setting request header

        HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create("__APIRootURL__");

        httpWebRequest.ContentType = "application/json; charset=UTF-8";

        httpWebRequest.Method = "POST";

        httpWebRequest.Headers.Add("X-LINE-ChannelId", DB.SysConfig.LINEPay.ChannelId);

        httpWebRequest.Headers.Add("X-LINE-ChannelSecret", DB.SysConfig.LINEPay.SecretKey);



        //加入參數

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))

        {

            string requestJSON = "{\"productName\": \"" + DB.SysConfig.SYSTEM_NAME + "\"," +

                                "\"productImageUrl\": \"" + DB.SysConfig.URL_Shopping + "images/Logo.jpg\"," +

                                "\"amount\": " + oOrderObj.TotalAmount() + "," +

                                "\"currency\": \"TWD\"," +

                                "\"orderId\": \"" + oOrderObj.DisplayOrderId + "\"," +

                                "\"confirmUrl\": \"" + DB.SysConfig.URL_Shopping + "Handler/LinePay/GotoComfirm.aspx?Id=" + oOrderObj.Id + "\"," +

                                "\"cancelUrl\": \"" + DB.SysConfig.URL_Shopping + "Shopping/OrderComplete.aspx?Id=" + oOrderObj.Id + "\"," +

                                "\"capture\": \"true\"," +

                                "\"confirmUrlType\": \"CLIENT\"}";



            streamWriter.Write(requestJSON);

            streamWriter.Flush();

            streamWriter.Close();

        }



        //取得回覆資訊

        var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();

        //解讀回覆資訊

        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))

        {

            var responseJSON = streamReader.ReadToEnd();

            //將 JSON 轉為物件

            GN.LinePay.reserveRes.ReturnJSON oReturnObj = (GN.LinePay.reserveRes.ReturnJSON)Newtonsoft.Json.JsonConvert.DeserializeObject(responseJSON, typeof(GN.LinePay.reserveRes.ReturnJSON));



            if (oReturnObj.returnCode == "0000")

            {

                //成功

            }

            else

            {

                //失敗

                string ErrMsg = "Error Code: " + oReturnObj.returnCode + "\r\n" + oReturnObj.returnMessage;

            }

        }

    }

}

.vb

Imports System.Net

Imports System.IO



Partial Class TEST

    Inherits System.Web.UI.Page



    Dim oOrderObj As DB.OrderMain

    Private Sub Admin_TEST_Load(sender As Object, e As EventArgs) Handles Me.Load

        'Setting request header

        Dim httpWebRequest As HttpWebRequest = WebRequest.Create("__APIRootURL__")

        httpWebRequest.ContentType = "application/json; charset=UTF-8"

        httpWebRequest.Method = "POST"

        httpWebRequest.Headers.Add("X-LINE-ChannelId", DB.SysConfig.LINEPay.ChannelId)

        httpWebRequest.Headers.Add("X-LINE-ChannelSecret", DB.SysConfig.LINEPay.SecretKey)

        '加入參數

        Using streamWriter As New StreamWriter(httpWebRequest.GetRequestStream())

            Dim requestJSON As String = "{""productName"": """ + DB.SysConfig.SYSTEM_NAME + """," +

                                        """productImageUrl"": """ + DB.SysConfig.URL_Shopping + "images/Logo.jpg""," +

                                        """amount"": " + oOrderObj.TotalAmount() + "," +

                                        """currency"": ""TWD""," +

                                        """orderId"": """ + oOrderObj.DisplayOrderId + """," +

                                        """confirmUrl"": """ + DB.SysConfig.URL_Shopping + "Handler/LinePay/GotoComfirm.aspx?Id=" + oOrderObj.Id + """," +

                                        """cancelUrl"": """ + DB.SysConfig.URL_Shopping + "Shopping/OrderComplete.aspx?Id=" + oOrderObj.Id + """," +

                                        """capture"": ""true""," +

                                        """confirmUrlType"": ""CLIENT""}"



            streamWriter.Write(requestJSON)

            streamWriter.Flush()

            streamWriter.Close()

        End Using

        '取得回覆資訊

        Dim httpResponse As HttpWebResponse = httpWebRequest.GetResponse

        '解讀回覆資訊

        Using streamReader As New StreamReader(httpResponse.GetResponseStream())

            Dim responseJSON As String = streamReader.ReadToEnd()

            '將 JSON 轉為物件

            Dim oReturnObj As GN.LinePay.reserveRes.ReturnJSON = Newtonsoft.Json.JsonConvert.DeserializeObject(responseJSON, GetType(GN.LinePay.reserveRes.ReturnJSON))



            Dim ResMsg As String = ""

            If oReturnObj.returnCode = "0000" Then

                '成功



            Else

                '失敗

            End If

        End Using

    End Sub

End Class

工具網站：
JSON 轉物件 http://json2csharp.com/
C# to VB : http://converter.telerik.com/



#專案： 紅科

Post 的資料好像會變大, 要改 Web.config

<system.web>

    <httpRuntime requestValidationMode="2.0" maxRequestLength="1024000"/>

</system.web>

程式碼如下:

public string UploadFilesToRemoteUrl(string url, string[] files, NameValueCollection formFields = null)

    {

        string boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x");



        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

        request.ContentType = "multipart/form-data; boundary=" +

                                boundary;

        request.Method = "POST";

        request.KeepAlive = true;



        Stream memStream = new System.IO.MemoryStream();



        var boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" +

                                                                boundary + "\r\n");

        var endBoundaryBytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" +

                                                                    boundary + "--");





        string formdataTemplate = "\r\n--" + boundary +

                                    "\r\nContent-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}";



        if (formFields != null)

        {

            foreach (string key in formFields.Keys)

            {

                string formitem = string.Format(formdataTemplate, key, formFields[key]);

                byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);

                memStream.Write(formitembytes, 0, formitembytes.Length);

            }

        }



        string headerTemplate =

            "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n" +

            "Content-Type: application/octet-stream\r\n\r\n";



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

        {

            memStream.Write(boundarybytes, 0, boundarybytes.Length);

            var header = string.Format(headerTemplate, "uplTheFile", files[i]);

            var headerbytes = System.Text.Encoding.UTF8.GetBytes(header);



            memStream.Write(headerbytes, 0, headerbytes.Length);



            using (var fileStream = new FileStream(files[i], FileMode.Open, FileAccess.Read))

            {

                var buffer = new byte[1024];

                var bytesRead = 0;

                while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)

                {

                    Response.Write("bytesRead: " + bytesRead.ToString() + "<br>");

                    memStream.Write(buffer, 0, bytesRead);

                }

            }

        }



        memStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);

        request.ContentLength = memStream.Length;



        using (Stream requestStream = request.GetRequestStream())

        {

            memStream.Position = 0;

            byte[] tempBuffer = new byte[memStream.Length];

            memStream.Read(tempBuffer, 0, tempBuffer.Length);

            memStream.Close();

            requestStream.Write(tempBuffer, 0, tempBuffer.Length);

        }



        try

        {

            using (var response = request.GetResponse())

            {

                Stream stream2 = response.GetResponseStream();

                StreamReader reader2 = new StreamReader(stream2);

                return reader2.ReadToEnd();

            }

        }

        catch (Exception ex)

        {

            return (ex.ToString());

            throw;

        }

    }

客戶要求
1. 檔案只能放在 Firewall 內的後台用 Web server (Server A).
2. 使用者只能存取 DMZ 的 Web server (Server B).
3. Server B 只能用 HTTP 通過 Firewall 向 Server A 要資料.(i.e.  Server B 不能掛戴 Server A 的目錄成為虛擬目錄)

所以在 Server B 上面建立了一支程式用 HTTP 的方式讀取 Server A 的檔案再寫出去.

例如, http://ServerB/Upload/test.pdf 會讀取 http://ServerA/Upload/test.pdf 再送到 Client 端

namespace WWW.Controllers

{

    public class UploadController : Controller

    {

        // GET: Upload

        public void Index(string Filename)

        {

            //Create a stream for the file

            Stream stream = null;



            //This controls how many bytes to read at a time and send to the client

            int bytesToRead = 10000;



            // Buffer to read bytes in chunk size specified above

            byte[] buffer = new Byte[bytesToRead];



            string url = "http://admin-dev.nanya.bike.idv.tw/newnanyaback/Upload/" + Filename;



            // The number of bytes read

            try

            {

                //Create a WebRequest to get the file

                HttpWebRequest fileReq = (HttpWebRequest)HttpWebRequest.Create(url);



                //Create a response for this request

                HttpWebResponse fileResp = (HttpWebResponse)fileReq.GetResponse();



                if (fileReq.ContentLength > 0)

                    fileResp.ContentLength = fileReq.ContentLength;



                //Get the Stream returned from the response

                stream = fileResp.GetResponseStream();



                // prepare the response to the client. resp is the client Response

                var resp = HttpContext.Response;



                if (Filename.ToLower().EndsWith(".png") ||

                    Filename.ToLower().EndsWith(".jpg") ||

                    Filename.ToLower().EndsWith(".jpeg") ||

                    Filename.ToLower().EndsWith(".gif")

                    )

                {

                    resp.ContentType = "image";

                }

                else

                {

                    //Indicate the type of data being sent

                    resp.ContentType = "application/octet-stream";



                    //Name the file

                    resp.AddHeader("Content-Disposition", "attachment; filename=\"" + HttpUtility.UrlEncode(Filename, Encoding.UTF8) + "\"");

                }



                resp.AddHeader("Content-Length", fileResp.ContentLength.ToString());



                int length;

                do

                {

                    // Verify that the client is connected.

                    if (resp.IsClientConnected)

                    {

                        // Read data into the buffer.

                        length = stream.Read(buffer, 0, bytesToRead);



                        // and write it out to the response's output stream

                        resp.OutputStream.Write(buffer, 0, length);



                        // Flush the data

                        resp.Flush();



                        //Clear the buffer

                        buffer = new Byte[bytesToRead];

                    }

                    else

                    {

                        // cancel the download if client has disconnected

                        length = -1;

                    }

                } while (length > 0); //Repeat until no data is read

            }

            finally

            {

                if (stream != null)

                {

                    //Close the input stream

                    stream.Close();

                }

            }

        }

    }

}

但不是這樣就好了, 在 RouteConfig.cs 中要加上:
            routes.MapRoute(
                name: "Upload",
                url: "Upload/{filename}",
                defaults: new { controller = "Upload", action = "Index", filename = UrlParameter.Optional }
            );

此外在 Web.Config 中也要加上:

  <system.webServer>
    <handlers>
      <add name="UrlRoutingHandler_Upload"
           type="System.Web.Routing.UrlRoutingHandler, 
               System.Web, Version=4.0.0.0, 
               Culture=neutral, 
               PublicKeyToken=b03f5f7f11d50a3a"
           path="/Upload/*"
           verb="GET"/>
    </handlers>
  </system.webServer>

參考:
http://stackoverflow.com/questions/5596747/download-stream-file-from-url-asp-net

http://blog.darkthread.net/post-2014-12-05-mvc-routing-for-url-with-filename.aspx

這是一篇加密文章，需輸入密碼才可閱讀

今天網站升到 .Net Framework 4.0 時，突然有幾個頁面一執行就會load不停，並且造成 w3wp.exe 的CPU飆高。

經查詢之後發現，問題發生在執行SQL時；會load不停的頁面所呼叫的連線字串中，都將屬性Connection Timeout=0

，因此將Connection Timeout=0拿掉就好了。

<add key="xxxxxx" value="server={server};database={DB};uid={uid};pwd={pwd};Max Pool Size={size};Connection Timeout=0"/>

http://msdn.microsoft.com/zh-cn/library/system.data.oracleclient.oracleconnection.connectiontimeout(v=vs.110).aspx

所以在設定連線字串時，應避免將Connection Timeout設成0，否則會無限期的等待連接。


p.s. 很神奇的事是，在 .Net Framework 2.0 是正常的，但升成 4.0 後才會load不停，不知道為什麼。

這是一篇加密文章，需輸入密碼才可閱讀

我找到了我一直很想要的用滑鼠滑一滑就可以關掉頁面和上一頁下一頁的擴充套件啦~​​​

Smooth Gestures 

是這裡分享的>>​幸運草的吉光片羽

他還有分享其他很好用的套件,大家可以安裝來用用唷~