/// <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());

        }

        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 };

        }

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();

        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" };

        }

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);

        }

    }

}

-- 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

        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);

        }

public static void UpdateTableCache()

{

    //標記自已是正在執行的 Thread. 讓舊的 Thread 在執行完畢之後, 應該會自動結束. 以防舊的 Thread 執行超過 10 秒.

    CurrentThreadId = System.Threading.Thread.CurrentThread.ManagedThreadId;



    try

    {

        //確認自已是正在執行的 Thread, 重覆執行. (另一個 Thread 插入執行)

        while (CurrentThreadId == System.Threading.Thread.CurrentThread.ManagedThreadId)

        {

            LastUpdateDate = DateTime.Now;



            foreach (var dbId in CachedDbs)

            {

                var sql = @"select * from table_monitor";



                var dt = Su.PgSql.DtFromSql(sql, dbId);



                foreach (DataRow row in dt.Rows)

                {

                    string changeId = row["update_count"].DBNullToDefault();

                    string CacheKey = TableCacheKey(dbId, row["table_name"].DBNullToDefault());

                    ObjectCache cache = MemoryCache.Default;



                    string OldValue = (string)cache[CacheKey];



                    if (OldValue == null)

                    {

                        cache.Set(CacheKey, changeId, DateTime.MaxValue);

                    }

                    else

                    {

                        if (changeId != OldValue)

                        {

                            cache.Remove(CacheKey);

                            cache.Set(CacheKey, changeId, DateTime.MaxValue);

                        }

                    }

                }

            }



            //每兩秒檢查一次

            System.Threading.Thread.Sleep(2000);

        }

    }

    catch (Exception)

    {

        //依經驗, 只要 DB 能通, 這裡幾乎不會有問題, 所以這裡暫時不處理, 未來有問題時可以考慮寫入文字檔比較好.

    }

}

        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

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

        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

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!;

}

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?"}

    };

}

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);

            }

        }

    }

}

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();

        }

    }

}

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();

        }

    }

}

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"));

            }

        }

    }

}