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頁數 5 / 40 上一頁 下一頁
搜尋 0 結果:
sessionStorage 跨分頁無法讀取
問題:
在開出新分頁後,無法讀取 sessionStorage 的資料


可能原因:
Chrome 某個版本,Stop cloning sessionStorage for windows opened with noopener
a标签_blank默认 rel="noopener" ,所以a标签需要加入rel=“opener” 而才能像window.open("同源页面")这种方式新开的页面会复制之前的sessionStorage


解決方法:
開新分頁前,加入 rel=“opener”參數即可。
例:
<a href="http://..." target="_blank" rel="opener">Link</a>

$(".hlkPrint").click(function () {
    $("form").setPostDataToStorage();

    $("form").attr("rel", "opener");
    $("form").attr("target", "_blank");
    $("form").attr("action", "xxxxx.aspx");
    $("form").submit();
});





參考:
面试官:你确定多窗口之间sessionStorage不能共享状态吗???
More...
Reiko, 2022/12/1 下午 05:57:23
.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
資料庫 where 條件要注意的兩件事
最近剛好發生跟 MS SQL 有關的狀況,所以就記錄一下

1. where 字串欄位要不要加 N''  (unicode)
    範例: Select * from OrderDetail where OrderDetailId= N'20220923084533'
    基本上,欄位是 char、varchar 就不需要。nvarchar nchar 就要加 N
    這好像是廢話,但往往寫程式會沒注意,甚至是會覺得通通加 N 比較沒問題
    但如果欄位牽涉到 index 就會影響搜尋 ,所以寫程式當下要注意
-- 假設 OrderDetailId 是 varchar(20)
-- OrderDetail 有千萬筆資料

Select * from OrderDetail where OrderDetailId= N'20220923084533'
-- 結果跑超級久 (未使用 PK 找,掃整個 table)
Select * from OrderDetail where OrderDetailId= '20220923084533'
-- 結果一下就出來 (使用 PK 找)
-- **資料庫設計最好以數值來當 key 比較好

    
2.  當欄位有 null 值,where [clumnName] not in ('A')  也會排除 null 的狀況
     直覺上,只要下 not in (..)  那會其他項目都會抓出,但是實際上,該欄位是 null的資料也會被排除
     因為資料庫一旦你對某欄位下條件,他就會排除 null 的欄位,除非你指定  [clumnName] is null 才會有資料
 
More...
darren, 2022/9/23 下午 04:06:22
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
VS2022 上面安裝 NSwag (.Net 6.0)
改用 NSwag 時直接 Copy 舊專案,發現找不到 AddOpenApiDocument 和 UseOpenApi 以及 UseSwaggerUi3 如下圖:

 
 

找了一些文件,要求安裝套件,都沒有用,後來發現在 Dependencies 的 Packages 直接新增 NSwag.AspNetCore 即可 





 
不要用 NuGet Package Manager 哦...
More...
Bike, 2022/9/3 下午 05:31:14
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
合併兩個 Expression -- Combining two expressions (Expression>)
找了很久,原來就在 梨子給的範例裡。

假設有兩個 expression: e1, e2

            var combineBody = Expression.AndAlso(e1.Body, Expression.Invoke(e2, e1.Parameters[0]));
            var finalExpression = Expression.Lambda<Func<TestClass, bool>>(combineBody, e1.Parameters).Compile();


同理,把上面的 AndAlso 換成 OrElse 就可以用 Or 合併。

即使只有兩行,還是不太可能背起來,所以當然要來做一下擴充

    public static class ExpressionExtension
    {
        public static Expression<Func<T, bool>> AndAlso<T>(this Expression<Func<T, bool>> e1, Expression<Func<T, bool>> e2)
        {
            var combineE = Expression.AndAlso(e1.Body, Expression.Invoke(e2, e1.Parameters[0]));

            return Expression.Lambda<Func<T, bool>>(combineE, e1.Parameters);
        }

        public static Expression<Func<T, bool>> OrElse<T>(this Expression<Func<T, bool>> e1, Expression<Func<T, bool>> e2)
        {
            var combineE = Expression.OrElse(e1.Body, Expression.Invoke(e2, e1.Parameters[0]));

            return Expression.Lambda<Func<T, bool>>(combineE, e1.Parameters);
        }
    }


使用範例:

            Expression<Func<Market, bool>> e1 = e => e.Is_Deleted == isDelete;

            Expression<Func<Market, bool>> e2 = e => string.IsNullOrEmpty(marketNo) || e.MarketNo.ToUpper().Contains(marketNo.ToUpper());

            return new
            {
                andMarkets = Ds.PageContext.ShopBandContext.Markets.Where(e1.AndAlso(e2)).ToList(),
                orMarkets = Ds.PageContext.ShopBandContext.Markets.Where(e1.OrElse(e2)).ToList(),
            };



 再補兩個擴充, 可以把多個 Expression 用 AndAlso 或 OrElse 串在一起:

        public static Expression<Func<T, bool>> OrElseAll<T>(this IEnumerable<Expression<Func<T, bool>>> exps)
        {
            if (exps.Count() == 1)
            {
                return exps.First();
            }

            var e0 = exps.First();

            var orExp = exps.Skip(1).Aggregate(e0.Body, (x, y) => Expression.OrElse(x, Expression.Invoke(y, e0.Parameters[0])));

            return Expression.Lambda<Func<T, bool>>(orExp, e0.Parameters);
        }

        public static Expression<Func<T, bool>> AndAlsoAll<T>(this IEnumerable<Expression<Func<T, bool>>> exps)
        {
            if (exps.Count() == 1)
            {
                return exps.First();
            }

            var e0 = exps.First();

            var orExp = exps.Skip(1).Aggregate(e0.Body, (x, y) => Expression.AndAlso(x, Expression.Invoke(y, e0.Parameters[0])));

            return Expression.Lambda<Func<T, bool>>(orExp, e0.Parameters);
        }


使用範例:

            Expression<Func<Market, bool>> q = e =>
            e.Is_Deleted == "N"
            && (string.IsNullOrEmpty(marketNo) || e.MarketNo.ToLower().Contains(marketNo.ToLower()))
            && (string.IsNullOrEmpty(isCombination) || isCombination != "Y" || e.TypeEnum == 200);

            if (!string.IsNullOrEmpty(name))
            {
                var nameList = name.Split(',').Select(e => e.Trim())
                    .Where(e => !string.IsNullOrEmpty(e));

                if (nameList.Any())
                {
                    q = q.AndAlso(nameList
                        .Select(s => (Expression<Func<Market, bool>>)(e => e.Name.ToLower().Contains(s.ToLower())))
                        .OrElseAll());
                }
            }






另外在 google,整理了 stackoverflow 幾篇文章之後得到的另一個方法,比較複雜, 不過可以讓人理解一下 Expression 比較底層的東西,也留下來參考一下。

    internal class MergeTool : ExpressionVisitor
    {
        private readonly ParameterExpression _parameter;

        protected override Expression VisitParameter(ParameterExpression node)
        {
            return base.VisitParameter(_parameter);
        }

        internal MergeTool(ParameterExpression parameter)
        {
            _parameter = parameter;
        }

        public static Expression<Func<T, bool>> MergedExpression<T>(Expression<Func<T, bool>> e1, Expression<Func<T, bool>> e2)
        {
            ParameterExpression param = Expression.Parameter(typeof(T));

            BinaryExpression MergeBody = Expression.AndAlso(e1.Body, e2.Body);

            var ReplacedBody = (BinaryExpression)new MergeTool(param).Visit(MergeBody);

            return Expression.Lambda<Func<T, bool>>(ReplacedBody, param);
        }
    }

使用時要 Compile

            var mergedExpression = MergeTool.MergedExpression(e1, e2);

            var list = testList.Where(mergedExpression.Compile());

More...
Bike, 2022/8/13 下午 05:53:28
.Net MAUI 測試
使用 android device 時,遇到 "若要建立此專案,必須安裝下列工作負載: maccatalyst" 這個錯誤



In Terminal, install the latest public build of .NET MAUI:

dotnet workload install maui --source https://api.nuget.org/v3/index.json

dotnet workload install android

安裝後要重新啟動 Visual Studio
More...
Bike, 2022/7/30 下午 09:07:35
冷知識 關於CPU超頻與多核的關係
這篇文章中的回答提到 https://ithelp.ithome.com.tw/questions/10209520

多核使用時CPU的運作頻率會被限制,因此當使用多執行續進行大資料量處理時(先不考慮硬碟速度)對每個CPU核心的效率會下降,因此為了進行多核處理進行資料分割的成本考量會有不小的影響。

 
More...
梨子, 2022/7/28 下午 03:59:25
Shopee V2 Api 取得AccessToken
從github抓取應用程式
https://github.com/g13579112000/ShopeeApiV2
More...
梨子, 2022/7/21 下午 09:40:45
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