UW -> DB 物件產生器會產生兩個function
GetAllDataFromBaseTableWithCache(string OrderFields = "_Default", bool IsCopy = true )
以及
Get物件名稱FromCachedDT(string Key)
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設計上是希望將所有資料Cache在記憶體，然後前端直接抓出資料，不須到資料庫抓資料
理論上網頁速度應該比較佳，實際上卻發現是效能殺手

原因在於 GetAllDataFromBaseTableWithCache 是抓出整個table的資料放到 Cache
然後又做了一件事，當有人要資料時，會把整個 DataTable 做 Copy() 再 return
也就是說，當DataTable有數千筆資料列時
每叫用一次 "Get物件名稱FromCachedDT(string Key)" 就會把數千筆資料整個複製一次
再從複製出來的DataTable Select 出一列 return
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解決方法:
Get物件名稱FromCachedDT(string Key)  --> 改成一筆一筆資料做 Cache，這樣 Copy() 只會Copy一筆
實測上，原本頁面要跑1.8秒，調整後可以 0.4 秒就完成
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結論:
PG產生器就把 GetAllDataFromBaseTableWithCache 拿掉吧

目標收集 SEO 的 10 個最重要的原則. 10 個就好....

1. 每一頁都要有 title, description. 但不可以有 keyword.

2. 使用 URL Rewrite.

3. 產品說明: https://developers.google.com/search/docs/data-types/product

4. 圖片加上 title 和 alt

5. Description 中, 重點關鍵字要出現兩次.

6. 使用 canonical 集合積分統計統果.

點選開始結帳卻發現觸發後面商品數量的select按鈕
若select z-index=200 則蓋在上面的按鈕則z-index=201
上面的z-index要比下面的z-index大
就可以解決了

 

        public void TEST(SEPM.SEPMDataContext oDC)

        {

            //一般 LINQ 寫法, 欄位只能寫死, 如:

            var Q = query.OrderBy(r => r.statusId).ToList();



            //若 OrderBy 的欄位不是固定的



            //方法一：條列

            var orderBy = "XXX";

            if (orderBy == "ownerId")

            {

                Q = Q.OrderBy(r => r.ownerId).ToList();

            }

            else if (orderBy == "endDate")

            {

                Q = Q.OrderBy(r => r.endDate).ToList();

            }



            //方法二：

            Q = Q.OrderBy(r => GetPropertyValue(r, orderBy)).ToList();

        }



        private object GetPropertyValue(object obj, string property)

        {

            System.Reflection.PropertyInfo propertyInfo = obj.GetType().GetProperty(property);

            return propertyInfo.GetValue(obj, null);

        }

參考：http://coderemind.blogspot.tw/2013/10/linq.html

https://stackoverflow.com/questions/628565/display-lines-number-in-stack-trace-for-net-assembly-in-release-mode/628590#628590

1. Go into the Properties window for the project where you want to see stack trace line numbers.
2. Click on the Build "vertical tab".
3. Select "Release" configuration. Check the DEBUG constant parameter.
4. Uncheck the "Optimize code" parameter to avoid the occasional trace issue with inlined code (this step is not essential).
5. Press the Advanced... button and choose Output -> Debug Info -> pdb-only.
6. Deploy the generated .pdb file with the assembly.

 
 
 

以前年輕不懂事, 寫了一些很遜的程式碼, 例如:

舊的程式碼:

        public static DataTable DTFromSQL(string Sql, string DBC = null, Int32 timeout = 0)

        {

            SqlDataAdapter DA = new SqlDataAdapter(Sql, GetDBC(DBC));



            DataTable DT = new DataTable();

            try

            {

                DA = new SqlDataAdapter(Sql, DBC);

                if (timeout > 0)

                {

                    DA.SelectCommand.CommandTimeout = timeout;

                }



                DA.Fill(DT);

            }

            catch (Exception ex)

            {

                throw new Exception(ex.ToString());

            }

            finally

            {

                DA.Dispose();

            }



            return DT;

        }

新的程式碼:

        public static DataTable DTFromSQL(string Sql, string DBC = null, Int32 timeout = 30)

        {

            using (var DA = new SqlDataAdapter(Sql, GetDBC(DBC)))

            {

                //不可為 null

                DataTable DT = new DataTable();



                DA.SelectCommand.CommandTimeout = timeout;



                DA.Fill(DT);



                return DT;

            }

        }

可以參考:
https://dotblogs.com.tw/yc421206/archive/2012/01/03/64154.aspx
 

試分析以下兩個 function..

        public static void WriteText1(string FileName, List<string> ltData)

        {

            foreach(string data in ltData)

            {

                System.IO.File.AppendAllText(FileName, data);

            }

        }



        public static void WriteText2(string FileName, List<string> ltData)

        {

            var Res = "";

            foreach (string data in ltData)

            {

                Res += data;

            }



            System.IO.File.WriteAllText(FileName, Res);

        }

https://www.techrepublic.com/article/working-with-the-aspnet-globalasax-file/

Application_BeginRequest
Application_AuthenticateRequest
Application_AuthorizeRequest
Application_ResolveRequestCache
Application_AcquireRequestState
Application_PreRequestHandlerExecute
Application_PreSendRequestHeaders
Application_PreSendRequestContent
<<code is executed>>
Application_PostRequestHandlerExecute
Application_ReleaseRequestState
Application_UpdateRequestCache
Application_EndRequest

抓出每個 Block_Id 中, End_Date 最小的資料.

語法 A:
With TempBlock as (
Select *, 
ROW_NUMBER() OVER(PARTITION BY B.Block_Id ORDER BY B.End_Date, B.Id) AS rk 
from BlockData B Where IsDelete = 'N' and End_Date >= getDate())
Select * from TempBlock Where rk = 1

語法 B:
Select * from (
Select *, 
ROW_NUMBER() OVER(PARTITION BY B.Block_Id ORDER BY B.End_Date, B.Id) AS rk 
from BlockData B Where IsDelete = 'N' and End_Date >= getDate()) TempBlock 
Where rk = 1

修改欄位設定時，出現需要刪除資料表(drop table)再建立資料表(create table)才能修改時，
於 [工具] > [選項] > [設計工具]
清除防止儲存需要重新建立資料表的變更] 核取方塊，即可。
如下圖


參考網址：https://support.microsoft.com/zh-tw/help/956176/error-message-when-you-try-to-save-a-table-in-sql-server-saving-change