c＃错误与数据集更新

我有列表中的名称为temp1的字符串在此列表中我有一组单词为每个单词即时计算N00，N01，N10，N11，MI最后它是抛出异常更新无法找到TableMapping ['sample']或DataTable'sample'。 .plz帮助c＃错误与数据集更新

DataSet dsSelectAll = new DataSet(); 
    SqlCommand cmdSelectAll = new SqlCommand("select * from sample", con); 
    SqlDataAdapter daSelectAll = new SqlDataAdapter(cmdSelectAll); 
    SqlCommandBuilder scb = new SqlCommandBuilder(daSelectAll); 
    daSelectAll.FillSchema(dsSelectAll,SchemaType.Mapped, "sample"); 

    foreach (string ri in temp1) 
    { 
     //for (int a3 = 0; a3 < ssl.Count; a3++) 
     { 


       cmdT.CommandText = @"SELECT * FROM [vijay].[dbo].[sample] where keyword in ('y','" + ri + "')"; 
       // ds.Tables.Clear(); 
       da.Fill(ds); 

       // row 1 ::  1 0 0 1 0 0 
       // row 2::  2 7 0 0 0 1 

       int N00 = 0; 
       int N01 = 0; 
       int N10 = 0; 
       int N11 = 0; 

       for (int i = 0; i < ds.Tables[0].Columns.Count; i++) 
       { 
        // N00 
        if (ds.Tables[0].Rows[0][i].ToString() == "0") 
        { 
         if (ds.Tables[0].Rows[1][i].ToString() == "0") 
         { 
          N00++; 
         } 
        } 

        // N01 
        if (ds.Tables[0].Rows[0][i].ToString() == "1") 
        { 
         if (ds.Tables[0].Rows[1][i].ToString() == "0") 
         { 
          N01++; 
         } 
        } 

        // N10 
        if (ds.Tables[0].Rows[0][i].ToString() == "0") 
        { 
         if ((ds.Tables[0].Rows[1][i].ToString()) !="0") 
         { 
          N10++; 
         } 
        } 

        // N11 
        if (ds.Tables[0].Rows[0][i].ToString() == "1") 
        { 
         if (ds.Tables[0].Rows[1][i].ToString()!="0") 
         { 
          N11++; 
         } 
        } 
       } 

       //if (a3 == (ssl.Count - 1)) 
       { 
        //SqlCommand ins = new SqlCommand("update sample set N00=" + N00 + " where KeyWord='" + ri + "'", con); 
        //ins.ExecuteNonQuery(); 

        DataRow[] drSelectAll = ds.Tables[0].Select("KeyWord='" + ri + "'"); 
        drSelectAll[0]["N00"] = N00; 
        drSelectAll[0]["N01"] = N01; 
        drSelectAll[0]["N10"] = N10; 
        drSelectAll[0]["N11"] = N11; 


        double n = N00 + N11 + N10 + N01; 
        double w1 = Convert.ToDouble((N11/n) * (Math.Log(((n * N11)/((N10 + N11) * (N01 + N11))), 2))); 
        double w2 = Convert.ToDouble((N01/n) * (Math.Log(((n * N01)/(((N01 + N00) * (N01 + N11)))), 2))); 
        double w4 = Convert.ToDouble((N00/n) * (Math.Log(((n * N00)/(((N00 + N01) * (N00 + N10)))), 2))); 
        double w3 = Convert.ToDouble((N10/n) * (Math.Log(((n * N10)/(((N10 + N11) * (N00 + N10)))), 2))); 
        if (w1.ToString() == "NaN") 
        { 
         w1 = 0; 
        } 
        if (w2.ToString() == "NaN") 
        { 
         w2 = 0; 
        } 
        if (w3.ToString() == "NaN") 
        { 
         w3 = 0; 
        } 
        if (w4.ToString() == "NaN") 
        { 
         w4 = 0; 
        } 

        double ni = w1 + w2 + w3 + w4; 

        drSelectAll[0]["MI"] = ni; 
        ds.Tables[0].Rows.Add(drSelectAll); 
       } 

     } 
    } 


    try 
    { 

     daSelectAll.Update(ds, "sample"); 

    } 
    catch (Exception) 
    { 

     throw;//error 
    }

错误：更新找不到TableMapping [ '样品']或DataTable的 '样本'。

来源

2010-09-03 user347640

我想你在你的代码中缺少tablemapping。

来自MSDN：“如果您在调用DataAdapter的Fill或Update方法时未指定TableName或DataTableMapping名称，则DataAdapter将查找名为”Table“的DataTableMapping。如果该DataTableMapping不存在， DataTable的TableName将为“Table”，您可以通过创建名为“Table”的DataTableMapping来指定默认的DataTableMapping。

http://msdn.microsoft.com/en-us/library/ks92fwwh(vs.71).aspx

来源

2010-09-03 08:58:06

c＃错误与数据集更新

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