WITH DepartmentTree AS (
    SELECT       
        Id, 
        Code,
        Name,
        UpDepartmentId,
        1 as Level
    FROM       
        SaintEir_Department
    WHERE Id  = 1
    UNION ALL
    SELECT 
        e.Id, 
        e.Code,
        e.Name,
        e.UpDepartmentId,
        o.Level + 1 as Level
    FROM 
        SaintEir_Department e
        INNER JOIN DepartmentTree o 
            ON o.Id = e.UpDepartmentId
)
SELECT * FROM DepartmentTree;

請得要用 using 來初始化物件 或是 dispose 

            using(var provider = new SHA512CryptoServiceProvider())
            {
                byte[] hashvalue2 = provider.ComputeHash(data2ToHash);
                return BitConverter.ToString(hashvalue2).Replace("-", "").ToLower();
            }

先貼一下，有空再整理
XmlReaderSettings settings = new XmlReaderSettings();
            settings.DtdProcessing = DtdProcessing.Prohibit;
            settings.XmlResolver = null;            
            XmlReader xmlReader = XmlReader.Create(new StringReader(value), settings);
  
            XmlDocument doc = new XmlDocument();
            doc.XmlResolver = null; //弱掃修正
            doc.Load(xmlReader);
            return doc;

Entity Framework 提供了 ExecuteSqlRawAsync 和 FromSqlRaw  之後，可以和 Dapper 非常類似的用法。

我們在用 Dapper 時。最常用的就是 sql command 加上一個物件做為參數，就可以執行 CRUD 的動作。

其實用 Entity Framework 的 ExecuteSqlRawAsync 和 FromSqlRaw 也可以逹到幾乎一樣的效果。

ExecuteSqlRawAsync 和 FromSqlRaw 接受的參數是 object array (其實是 Microsoft.Data.SqlClient.SqlParameter 的 array)

所以我們先做一個 Object to Microsoft.Data.SqlClient.SqlParameter Array 的擴充, 可參考: https://gist.github.com/aliozgur/75182b2e9b0a58b83443

不過很奇怪的是，原作者提供的擴充轉出來的會是 System.Data.SqlClient.SqlParameter  Array 無法直接使用於 ExecuteSqlRawAsync 和 FromSqlRaw，所以要稍微改一下，把 using System.Data.SqlClient; 改為 using Microsoft.Data.SqlClient; 即可:



另外，我們再自行 對 DbContext 做一個擴充如下:

        /// <summary>

        /// 會把物件 Parameter 的各 Property 帶入 SQL 中.

        /// </summary>

        /// <param name="dbct"></param>

        /// <param name="sql"></param>

        /// <param name="parameters"></param>

        /// <returns></returns>

        public static async Task<int> ExecuteParameterSqlAsync(this DbContext dbct, string sql, object parameters)

        {

            return await dbct.Database.ExecuteSqlRawAsync(sql, parameters.ToSqlParamsArray());

        }

最後的結果可以做到以下的效果: (res3 和 res4 是配合 FormattableString 的範例 )

 
範例程式碼:

        public async Task<object> EfTest()

        {

            var dbct = Ds.NewContext.GvContext;

            var insertSql = @"Insert into ProfileEvent(JobId,[Name],GvShoplineId,LiShoplineId,Phone,Email,LineId,GaClientId)

            Values(@JobId, @Name, null , null , null , @Email, @GaClientId , @GaClientId )";



            //執行 SQL 的原生寫法

            await dbct.Database.ExecuteSqlRawAsync(insertSql, new object[]

            {

                new SqlParameter("@JobId", 10),

                new SqlParameter("@Email", "XX'TT"),

                new SqlParameter("@Name", "AA'BB"),

                new SqlParameter("@GaClientId", "GaClientId"),

            });



            //執行 SQL 的擴充寫法

            await dbct.ExecuteParameterSqlAsync(insertSql, new

            {

                JobId = 10,

                Email = "XX'TT",

                Name = "AA'BB",

                GaClientId = "GaClientId"

            });



            //關於查詢

            string name = "%'B%";

            //原生寫法

            var res1 = await dbct.ProfileEvents.FromSqlRaw("Select top 100 * from ProfileEvent where Name like @name",

                new object[]

                    {

                        new SqlParameter("@name", "%'B%")

                    })

                .ToListAsync();



            //擴充, object to SqlParameter array

            var res2 = await dbct.ProfileEvents.FromSqlRaw("Select top 100 * from ProfileEvent where Name like @name",

                new { name }.ToSqlParamsArray())

                .ToListAsync();



            var res3 = await dbct.ProfileEvents.FromSql($"Select top 100 * from ProfileEvent where Name like {name}")

                .ToListAsync();



            var res4 = await dbct.ProfileEvents.FromSqlInterpolated($"Select top 100 * from ProfileEvent where Name like {name}")

                .ToListAsync();



            return new { res1, res2, res3, res4 };

        }

 

這個指令還是會把所有的資料 Select 出來，再更新

原指令:

UPDATE Job Set En_Status = 200 Where En_Status = 100 and LastTouchAt < '2023-05-06 12:34:56'
其中  '2023-05-06 12:34:56' 是 DateTime.Now.AddMinutes(-2) 的結果(Web Server 端的時間扣 2 分鐘)

但，若是改使用 UpdateFromQueryAsync 如下:
var c = await Ds.NewContext.GvContext.Jobs.Where(j => j.En_Status == Cst.Job.Status.Running && j.LastTouchAt < DateTime.Now.AddMinutes(-2))
                .UpdateFromQueryAsync(j => new Ds.Gv.Job { En_Status = Cst.Job.Status.ReStarting });

產生的 SQL 如下:
UPDATE A 
SET A.[En_Status] = @zzz_BatchUpdate_0
FROM [Job] AS A
INNER JOIN ( SELECT [j].[Id], [j].[CancelledAt], [j].[CancelledBy], [j].[En_Status], [j].[EndAt], [j].[Exception], [j].[Filename], [j].[InformationJson], [j].[InitAt], [j].[Is_CheckOnly], [j].[LastTouchAt], [j].[LastTouchMessage], [j].[LoopStartAt], [j].[Name], [j].[ScheduleId], [j].[TotalTouch], [j].[TouchCount]
FROM [Job] AS [j]
WHERE [j].[En_Status] = 100 AND [j].[LastTouchAt] < DATEADD(minute, CAST(-2.0E0 AS int), GETDATE())
           ) AS B ON A.[Id] = B.[Id]

有兩個要注意的地方:
1. 它會先 Select 全欄位，再做更新

2. 它的時間是 DB Server 的現在時間。不是 Web Server 端的時間。


順便記錄一下。若是要執行 Update xx Ser cc = cc + 1 Where ...

EF 可寫為:
var c = await Ds.NewContext.GvContext.Jobs.Where(j => j.En_Status == Cst.Job.Status.Running && j.LastTouchAt < DateTime.Now.AddMinutes(-2))
                .UpdateFromQueryAsync(j => new Ds.Gv.Job { TotalTouch = j.TotalTouch + 1 });

轉換的 SQL 為:
UPDATE A 
SET A.[TotalTouch] = B.[TotalTouch] + 1
FROM [Job] AS A
INNER JOIN ( SELECT [j].[Id], [j].[CancelledAt], [j].[CancelledBy], [j].[En_Status], [j].[EndAt], [j].[Exception], [j].[Filename], [j].[InformationJson], [j].[InitAt], [j].[Is_CheckOnly], [j].[LastTouchAt], [j].[LastTouchMessage], [j].[LoopStartAt], [j].[Name], [j].[ScheduleId], [j].[TotalTouch], [j].[TouchCount]
FROM [Job] AS [j]
WHERE [j].[En_Status] = 100 AND [j].[LastTouchAt] < DATEADD(minute, CAST(-2.0E0 AS int), GETDATE())
           ) AS B ON A.[Id] = B.[Id]

dotnet publish -f:net7.0-android -c:Release

在新增 .Net 7 專案時。不用特別指定 app.UseRouting() 就可以使用 attribute routing.

但會遇到一個問題:

原來應該出靜態檔案的 Request 會被符合 Routing Rule 的 Action 攔截。

解決的方法是 :

在 UseStaticFiles 之後手動再加上 app.UseRouting(), 範例如下:

app.UseStaticFiles(new StaticFileOptions

{

    OnPrepareResponse = ctx =>

    {

        const int durationInSeconds = 60 * 60 * 24 * 365; //一年

        ctx.Context.Response.Headers[HeaderNames.CacheControl] =

            "public,max-age=" + durationInSeconds;

    }

});



app.UseRouting();

我們會使用 Validation Attribute 來客製化 Validation 的輸出結果，但在 .Net 7 的專案突然失效了。原因是 [ApiController] 會自動回傳 400 錯誤，攔截了 Validation Attribution 的執行。

解決方法, 在 program.cs 中加上以下的程式碼:

builder.Services.Configure<ApiBehaviorOptions>(options
=> options.SuppressModelStateInvalidFilter = true);
 

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

產生 FileStreamResult 物件的 function 如下: (目前置於 SU 之中，以便轉移)

        static List<Brush> CaptchaBrushes = null;

        public static FileStreamResult CreateCaptcha(string captcha)

        {

            if (CaptchaBrushes == null)

            {

                CaptchaBrushes = new List<Brush>();

                CaptchaBrushes.Add(Brushes.White);

                CaptchaBrushes.Add(Brushes.Gold);

                CaptchaBrushes.Add(Brushes.LightSkyBlue);

                CaptchaBrushes.Add(Brushes.LimeGreen);

                CaptchaBrushes.Add(Brushes.AliceBlue);

                CaptchaBrushes.Add(Brushes.AntiqueWhite);

                CaptchaBrushes.Add(Brushes.BurlyWood);

                CaptchaBrushes.Add(Brushes.Silver);

            }



            int width = 90;

            int height = 45;



            //https://stackoverflow.com/questions/61365732/cannot-access-a-closed-stream-when-returning-filestreamresult-from-c-sharp-netc

            //Using statements close and unload the variable from memory set in the using statement which is why you are getting an error trying to access a closed memory stream.You don't need to use a using statement if you are just going to return the result at the end.



            //這個 memory stream 不用關閉或 dispose

            var ms = new MemoryStream();



            // 釋放所有在 GDI+ 所佔用的記憶體空間 ( 非常重要!! )

            using (Bitmap _bmp = new Bitmap(width, height))

            using (Graphics _graphics = Graphics.FromImage(_bmp))

            using (Font _font = new Font("Courier New", 24, FontStyle.Bold)) // _font 設定要出現在圖片上的文字字型、大小與樣式

            {

                // (封裝 GDI+ 繪圖介面) 所有繪圖作業都需透過 Graphics 物件進行操作

                _graphics.Clear(Color.Black);



                // 如果想啟用「反鋸齒」功能，可以將以下這行取消註解

                //_graphics.TextRenderingHint = TextRenderingHint.AntiAlias;



                // 將亂碼字串「繪製」到之前產生的 Graphics 「繪圖板」上

                var x = 10;

                for(var i = 0; i < captcha.Length; i++)

                {

                    _graphics.DrawString(captcha.Substring(i, 1), _font, CaptchaBrushes[Su.MathUtil.GetRandomInt(CaptchaBrushes.Count)], x, Su.MathUtil.GetRandomInt(15));

                    x += 10 + Su.MathUtil.GetRandomInt(10);

                }



                // 畫線

                

                _graphics.DrawLine(new Pen(CaptchaBrushes[Su.MathUtil.GetRandomInt(CaptchaBrushes.Count)], 1),

                    Su.MathUtil.GetRandomInt(0, Convert.ToInt32((width * 0.9 / 2))), 0, Su.MathUtil.GetRandomInt(Convert.ToInt32(width / 2), Convert.ToInt32(width * 1.9 / 2)), height);

                

                _graphics.DrawLine(new Pen(CaptchaBrushes[Su.MathUtil.GetRandomInt(CaptchaBrushes.Count)], 1),

                    Su.MathUtil.GetRandomInt(Convert.ToInt32(width / 2), Convert.ToInt32(width * 1.9 / 2)), 0, Su.MathUtil.GetRandomInt(0, Convert.ToInt32((width * 0.9 / 2))), height);

                

                _graphics.DrawLine(new Pen(CaptchaBrushes[Su.MathUtil.GetRandomInt(CaptchaBrushes.Count)], 1),

                    0,

                    Su.MathUtil.GetRandomInt(height / 2),

                    width,

                    height / 2 + Su.MathUtil.GetRandomInt(height / 2)

                    );



                _graphics.DrawLine(new Pen(CaptchaBrushes[Su.MathUtil.GetRandomInt(CaptchaBrushes.Count)], 1),

                 0,

                 height / 2 + Su.MathUtil.GetRandomInt(height / 2),

                 width,

                    Su.MathUtil.GetRandomInt(height / 2)

                 );



                _bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

            }



            ms.Seek(0, SeekOrigin.Begin);



            // Controller 的型別為 FileResult

            return new FileStreamResult(ms, "image/jpeg")

            { FileDownloadName = $"{DateTime.Now.Ymdhmsf()}.jpg" };

        }

輸出用的 Controller 和 Action 如下:

namespace Web.Controllers

{

    public class CaptchaController : Controller

    {

        [Route("captcha")]

        public async Task<FileStreamResult> Index()

        {

            //產生 Captcha 並存入 Session 之中。目前是四位數字

            string captcha = (await Ah.ReGetAsync<object>("api/kol/create-captcha-code")).ToString();



            //產生圖檔並回傳 FileStreamResult

            return Su.Wu.CreateCaptcha(captcha);

        }

    }

}