爲什麼我無法使用LINQ to SQL將數據更新到數據庫中？

Question

我正試圖在數據庫中讀取數據時更新數據，請參閱下文。 但整個事情完成後，數據沒有得到更新。

是否有我需要指定的任何事務語法？ （當我調試，我可以看到我有權利記錄中檢索。）

using (conn = new SqlConnection(MyConnectionString)) 
       using (SqlCommand cmd = new SqlCommand("dbo.MyProcedure", conn)) 
       { 
        cmd.CommandType = CommandType.StoredProcedure; 
        cmd.Parameters.AddWithValue("@Count", count); 
        conn.Open(); 
        using (SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection)) 
        { 
         while (reader.Read()) 
         { 
          // wrapper object, not related to database 
          SampleModel c = new SampleModel(); 
          c.ID= (string)reader["ID"]; 
          c.Name = (string)reader["Name"]; 
          c.Type = (int)reader["Type"]; 

          // modeList will return to outside, not related to database 
          modelList.Add(c); 

          sampleTable1 table1 = context.sampleTable1s.SingleOrDefault(t=> t.id = c.ID); 

          // try to update the "isRead", but it doesn`t work....!!! 
          // about the datatype, in the data base, it is "smallInt" 
          // in linq to sql, it is "short?" 
          // PS Default value all should be 0 
          table1.isRead = 1; 
          context.SubmitChanges(); <--- here, it doesn`t do the job // context is new from Linq to SQL 
         } 
        } 
        conn.Close(); 
       } 

這裏是我的方法：

SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 
CREATE PROCEDURE MyProcedure  
    @Count int = 100 
AS 
BEGIN 

    SELECT TOP (@Count) 
     t1.id AS ID, 
     t1.name AS Name, 
     t2.type AS TYPE  
    FROM sampleTable1 as t1 with (nolock), 
     sampleTable2 as t2 with (nolock)   
    WHERE (t1.t2Id = t2.Id)  
ORDER BY t1.name asc 

END 
GO 

如果我把我所有的代碼中TransactionScope塊

using (TransactionScope scope = new TransactionScope()) 
{ 
    // all the C# code above 
    scope.Complete(); 
} 

我將得到一個異常「服務器'localhost-sqlserver2005'上的MSDTC不可用。」

如果我只是把一些代碼的，沒有例外，但數據did`t得到更新

using (TransactionScope scope = new TransactionScope()) 
{ 
    sampleTable1 table1 = context.sampleTable1s.SingleOrDefault(t=> t.id = c.ID); 

    table1.isRead = 1; 
    context.SubmitChanges(); 

    scope.Complete(); 
} 

感謝。

Answer 1

檢查以便在L2S設計器中至少將相關實體類中的一個成員標記爲主鍵成員。如果一個實體沒有任何PK成員，L2S將在提交更新時靜靜地忽略它（默默地拋出，沒有更新的SQL語句生成併發送到數據庫）。

Answer 2

確保您擁有該表的主鍵集。如果你不能在db中這樣做，請在linq2sql設計器中執行。

回答了這個here,here和here。還提到它linq to sql pitfalls。