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頁數 1 / 7 下一頁
搜尋 date 結果:
PrintDocument 另存成 PDF
如果列印主機是 windows server 主機,通常會有 "Microsoft Print to PDF" 名稱的印表機
那使用 Print Document 物件另存成 PDF code 如下
pd.PrinterSettings.PrinterName = "Microsoft Print to PDF";
pd.PrinterSettings.PrintToFile = true;
pd.PrinterSettings.PrintFileName = @"C:\TEMP\XPS\" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".pdf";
More...
darren, 2025/5/12 下午 04:36:12
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
mysql 使用 EF model 要注意的地方
近日處理我們公司某個使用 my sql 的專案,已經被雷的幾次,紀錄一下

1.  使用 EF Scaffolding 指令去更新 Model ,有些欄位原本是明確型別 變成 可null型別
     也就是本來是 datetime 變成 datetime?, int 變成 int?
     看起來是一些 view 的欄位會有這些狀況,這時就要去 git revert ,避免build專案又一堆錯誤
2.  使用 IQueryable 語法處理時間要小心,不要在裡面計算時間。
     
DateTime shouldBeGiveCoinDateTime = DateTime.Now.AddDays(-14);
return dbContext.ViewOrderForCoinCronJob.AsNoTracking().Where(x =>
    x.CompletedAt <= shouldBeGiveCoinDateTime
    && x.CreatedAt >= DateTime.Now.AddYears(-1) // -> 這裡轉換mysql指令會出錯
    && x.DeletedAt == null
    && x.CoinAmount > 0
    && x.Status == (byte)ORDER_STATUS.COMPLETED
    && dbContext.PackingMain.Any(y => y.OrderId == x.Id)
    && x.IsGiveCoin != 0
    && !dbContext.CoinLog.Any(y =>
        y.OrderId == x.Id
        && y.StrKey.Contains(COIN_LOG.STRING_KEY_PREFIX.ORDER_ACCUMULATION)
    )
).ToList();

要把時間計算先算出來,再帶入式子
DateTime shouldBeGiveCoinDateTime = DateTime.Now.AddDays(-14);
DateTime createDateStartAt = DateTime.Now.AddYears(-1); // -> 先算出日期
return dbContext.ViewOrderForCoinCronJob.AsNoTracking().Where(x =>
    x.CompletedAt <= shouldBeGiveCoinDateTime
    && x.CreatedAt >= createDateStartAt // -> 帶入算好的日期
    && x.DeletedAt == null
    && x.CoinAmount > 0
    && x.Status == (byte)ORDER_STATUS.COMPLETED
    && dbContext.PackingMain.Any(y => y.OrderId == x.Id)
    && x.IsGiveCoin != 0
    && !dbContext.CoinLog.Any(y =>
        y.OrderId == x.Id
        && y.StrKey.Contains(COIN_LOG.STRING_KEY_PREFIX.ORDER_ACCUMULATION)
    )
).ToList();


 
More...
darren, 2025/3/10 下午 05:43:38
Restful 的 API 範例
Restful 的 API 範例,比較特別的是取得單一筆資料時,不是用一般常見的 {id} 而是用 get?id=xxx 的方式,以避免 XXS 的功擊。(不要把原網頁中的參數拼入 API 網址,要改用 Query String 的方式傳給 API)

using Ds;
using Ds.Gv;
using iText.Kernel.Geom;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using NPOI.SS.Formula.Functions;
using NPOI.SS.Util;
using Su;
using System.Linq.Expressions;

namespace CallCampaign.Api
{
    /// <summary>
    /// 行銷活動
    /// </summary>
    [Route("api/call-campaign")]
    [ApiController]
    [SetAuthorizationFilter(Sh.AuthCode.不設限)]
    public class ReserveCampaignController : Controller
    {
        /// <summary>
        /// 取得行銷活動列表
        /// </summary>
        /// <param name="reserveCampaignName"></param>
        /// <param name="currentPage"></param>
        /// <param name="pageSize"></param>
        /// <param name="orderByName"></param>
        /// <param name="sort"></param>
        /// <returns></returns>
        /// <exception cref="Exception"></exception>
        [HttpGet("")]
        public async Task<object> ListAsync([FromQuery] string reserveCampaignName = "", [FromQuery] int? currentPage = 1, [FromQuery] int? pageSize = 20, [FromQuery] string orderByName = "OrderNo", [FromQuery] string sort = "asc")
        {
            if (pageSize > 500)
            {
                pageSize = 500;
            }

            if (!(sort == "asc" || sort == "desc"))
            {
                throw new CustomException(System.Net.HttpStatusCode.BadRequest, "sort只能是asc或desc");
            }

            var temp = new V_ReserveCampaign().GetType().GetProperty(orderByName);
            if (temp == null)
            {
                throw new CustomException(System.Net.HttpStatusCode.BadRequest, "不存在欄位");
            }

            Expression<Func<V_ReserveCampaign, bool>> q = p => p.Is_Deleted == "N"
                    && (string.IsNullOrEmpty(reserveCampaignName) || (p.ReserveCampaignName != null && p.ReserveCampaignName.Contains(reserveCampaignName)))
                    ;

            if (orderByName.ToLower().Trim() != "id")
            {
                orderByName += " " + sort + ", id desc";
            }
            else
            {
                orderByName += " " + sort;
            }

            var ct = NewContext.GvContext;
            var list = await ct.GetPageListAsync(q, columns: "Id, ReserveCampaignName, OrderNo, StartAt, EndAt, ModifierName, ModifyDate, CreatorName, CreateDate", page: currentPage ?? 1, pageSize: pageSize ?? 20, orderByName);
            //var list = await ct.GetPageListAsync(q, page: currentPage ?? 1, pageSize: pageSize ?? 20, orderByName + " " + sort);
            return list;
        }

        /// <summary>
        /// 取得行銷活動
        /// </summary>
        /// <param name="Id"></param>
        /// <returns></returns>
        /// <exception cref="Exception"></exception>
        [HttpGet("get")]
        public async Task<dynamic> GetAsync([FromQuery] int Id)
        {
            var res = await Ds.NewContext.GvContext.ReserveCampaigns.Where(r => r.Id == Id)
                .FirstOrDefaultAsync();

            if (res == null)
            {
                throw new CustomException(System.Net.HttpStatusCode.BadRequest, "查無資料 " + Id.ToString());
            }
            return res;
        }
                
        /// <summary>
        /// 建立行銷活動
        /// </summary>
        /// <param name="dto"></param>
        /// <returns></returns>
        /// <exception cref="CustomException"></exception>
        [HttpPost("")]
        public async Task<object> CreateAsync(Dtos.CreateReserveCampaign dto)
        {
            var ct = NewContext.GvContext;
            var res = await Models.ReserveCampaignHelper.CreateReserveCampaignAsync(ct, dto);
            return res;
        }

        /// <summary>
        /// 編輯行銷活動
        /// </summary>
        /// <param name="dto"></param>
        /// <returns></returns>
        /// <exception cref="CustomException"></exception>
        [HttpPatch("")]
        public async Task<object> UpdateAsync(Dtos.UpdateReserveCampaign dto)
        {
            var ct = NewContext.GvContext;
            var res = await Models.ReserveCampaignHelper.UpdateReserveCampaignAsync(ct, dto);
            return res;
        }

        /// <summary>
        /// 刪除行銷活動
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        /// <exception cref="CustomException"></exception>
        [HttpDelete("")]
        public async Task<object> DeleteAsync([FromQuery] int id)
        {
            var res = await Ds.NewContext.GvContext.MarkDeleteAsync<Ds.Gv.ReserveCampaign>(id, Sh.ModifyInfo);
            return res;
        }
    }
}



再增加一個同步範例(只例出 action)


        /// <summary>
        /// 取得列表
        /// </summary>
        /// <param name="name"></param>
        /// <param name="currentPage"></param>
        /// <param name="pageSize"></param>
        /// <param name="orderByName"></param>
        /// <param name="sort"></param>
        /// <returns></returns>
        [HttpGet("")]
        public object List([FromQuery] string name = "", [FromQuery] int? currentPage = 1, [FromQuery] int? pageSize = 20, [FromQuery] string orderByName = "OrderNo", [FromQuery] string sort = "asc")
        {
            return "";
        }

        /// <summary>
        /// 取得明細資料
        /// </summary>
        /// <param name="Id"></param>
        /// <returns></returns>
        /// <exception cref="Exception"></exception>
        [HttpGet("get")]
        public object Get([FromQuery] int id)
        {
            return "";
        }

        /// <summary>
        /// 建立
        /// </summary>
        /// <param name="dto"></param>
        /// <returns></returns>
        /// <exception cref="CustomException"></exception>
        [HttpPost("")]
        public object Create(Dtos.PhysicalCheckUpType dto)
        {
            return "";
        }

        /// <summary>
        /// 編輯
        /// </summary>
        /// <param name="dto"></param>
        /// <returns></returns>
        /// <exception cref="CustomException"></exception>
        [HttpPatch("")]
        public object Update(Dtos.PhysicalCheckUpType dto)
        {
            return "";
        }

        /// <summary>
        /// 刪除
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        /// <exception cref="CustomException"></exception>
        [HttpDelete("")]
        public object Delete([FromQuery] int id)
        {
            return 1;
        }
More...
Bike, 2023/12/13 上午 08:54:28
ubuntu server安裝配置
ubuntu安裝時依照版本不同有些會需要先配置mirror site
mirror site的功用是提供下載套件與系統更新的站台
而要連網確認mirror site會需要配置網路接口,DNS與開放防火牆
17.10以後版本可前往 /etc/netplan 底下的.yaml文件內查看設置
相關參數說明↓
addresses: 對外ip (ex: 192.168.1.10/24)
gateway4: 網路關口, IPv4從本機連結網際網路的端口, 通常設定路由器的IP地址
nameservers: 底下的 addresses為DNS位置, 可設置 8.8.8.8 (google的公共服務器)
設置完後執行 sudo netplan apply變更配置
17.10以前的自己去問GPT, 配置差不多只是位置不一樣

輸入'systemd-resolve --status'查看配置
輸入'ping google.com'測試網路是否正常

以上配置完畢 防火牆有開ubuntu以後可以配置mirror site↓
ubuntu官方承認的Site清單
*注意!! 更新封包皆會從設定的Site取得, 雖是官方認證但是仍有風險, 有高度資安需求建議自行架設mirror site*
mirror site的配置於 /etc/apt/sources.list
'deb http://{domain}' 的皆需修改
可使用 ctrl + \ 來一次修改
完成後執行 'sudp apt-get update' 測試mirror site是否連通
More...
梨子, 2023/12/6 上午 10:39:22
關於 Entity Framework Extensions 的 UpdateFromQueryAsync
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]
More...
Bike, 2023/4/29 下午 08:44:31
.Net 6 的 Captcha 實做
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);
        }
    }
}
More...
Bike, 2022/9/25 下午 10:03:44
資安問題 -- Random 的替代 function
        static System.Security.Cryptography.RandomNumberGenerator RandomNumberGenerator = null;

        /// <summary>
        /// 回傳大於等於 0 小於 1
        /// </summary>
        /// <returns></returns>
        public static double NextDouble()
        {
            if (RandomNumberGenerator == null || LastRandomGenerateTime < DateTime.Now.AddMinutes(-1))
            {
                RandomNumberGenerator = System.Security.Cryptography.RandomNumberGenerator.Create();
            }

            // Generate four random bytes
            byte[] four_bytes = new byte[4];
            RandomNumberGenerator.GetBytes(four_bytes);

            // Convert the bytes to a UInt32
            uint scale = BitConverter.ToUInt32(four_bytes, 0);

            // And use that to pick a random number >= min and < max
            // 0 <= (scale / (uint.MaxValue + 1.0)) < 1
            return scale / (uint.MaxValue + 1.0);
        }

        /// <summary>
        /// 回傳值介於 min ~ (max - 1)
        /// </summary>
        /// <param name="min"></param>
        /// <param name="max"></param>
        /// <returns></returns>
        public static int GetRandomInt(int min, int max)
        {
            if(max < min)
            {
                throw new Exception("最大值不可小於最小值");
            }

            // Generate four random bytes
            byte[] four_bytes = new byte[4];
            RandomNumberGenerator.GetBytes(four_bytes);

            // And use that to pick a random number >= min and < max
            return (int)(min + (max - min) * NextDouble()); //因為 NextDouble 會小於 1,所以用無條件捨去.
        }

        /// <summary>
        /// 產生 0 ~ (max - 1) 的亂數
        /// </summary>
        /// <param name="max"></param>
        /// <returns></returns>
        public static int GetRandomInt(int max)
        {
            return GetRandomInt(0, max);
        }

        /// <summary>
        /// 產生 0 ~ (int.MaxValue - 1) 的亂數
        /// </summary>
        /// <returns></returns>
        public static int GetRandomInt()
        {
            return GetRandomInt(int.MaxValue);
        }
More...
Bike, 2022/9/22 下午 08:30:03
Postgres 中使用 Transaction (TransactionScope) 必需要自已實做重試的功能
在 Postgres 使用 TransactionScope 似乎很空易就會發生 Transaction Abort 的情況。所以必需自行實做 retry 的機制

            int tries = 0;
            while (tries < Su.PgSql.maxTransactionAborted)
            {
                try
                {
                    using (var scop = new System.Transactions.TransactionScope(TransactionScopeAsyncFlowOption.Enabled))
                    {
                        var context = ShopBandContext.Context;

                        updateCount = await context.UpdateAsync<MarketDiscount>(dto, Sc.ModifyInfo,
                            onlyColumns: "StartAt,EndAt,NewPrice,FrontEndMemo,BackEndMemo");

                        scop.Complete();
                        break; //這個 Break 很重要
                    }
                }
                catch (Exception ex)
                {
                    // 我發現因為是非同步模式,所以要檢查很多層的 InnerException
                    if (tries < Su.PgSql.maxTransactionAborted
                        && ((ex.InnerException != null && ex.InnerException is Npgsql.PostgresException && ((Npgsql.PostgresException)ex.InnerException).SqlState == "40001")
                            || (ex.InnerException.InnerException != null && ex.InnerException.InnerException is Npgsql.PostgresException && ((Npgsql.PostgresException)ex.InnerException.InnerException).SqlState == "40001")))
                    {
                        //隨機休息 10 ~ 20 ms, 等另一個 job 完工
                        System.Threading.Thread.Sleep(Su.MathUtil.Random.Next(10, 20));
                        tries++;
                    }
                    else
                    {
                        throw;
                    }
                }
            }
More...
Bike, 2022/8/25 上午 09:19:35
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