System.Data.DataRowView我該如何解決

Question

在我的代碼中，我爲每個按鈕做了一個方法，例如我有雞肉和牛肉按鈕，他們有自己的方法，當我點擊拳頭時間的雞肉按鈕時裝載它的表單將會顯示在列表框中，但是當我在雞之後點擊牛肉按鈕時，它會向我顯示一個System.ArgumentException。 這將如何解決？

private void Chicken() 
{ 
    using (connection = new SqlConnection(connectionString)) 
     using (SqlDataAdapter adapter = new SqlDataAdapter("select Chicken_Name,WithOrWithout_Name,Chicken_Price from Tbl_Add a full outer join tbl_Chicken b ON b.Chicken_ID = a.Chicken_ID full outer join Tbl_WithORWithot c ON a.WorWO_ID = c.WithOrWothout_ID ; ", connection)) 
     { 
      DataTable tbl_Chicken = new DataTable(); 
      adapter.Fill(tbl_Chicken); 

      lst_SHowdata.DisplayMember = "Chicken_Name"; 
      lstSHowdata2.DisplayMember = "Chicken_Price"; 

      lst_SHowdata.ValueMember = "Chicken_ID"; 
      lst_SHowdata.ValueMember = "Beef_ID"; 

      lst_SHowdata.DataSource = tbl_Chicken; 
      lstSHowdata2.DataSource = tbl_Chicken; 
     } 
} 

private void Beef() 
{ 
    using (connection = new SqlConnection(connectionString)) 
     using (SqlDataAdapter adapter = new SqlDataAdapter("select Beef_Name,WithOrWithout_Name ,Beef_Price from Tbl_Add a full outer join Tbl_Beef b ON b.Beef_ID = a.Beef_ID full outer join Tbl_WithORWithot c ON a.WorWO_ID = c.WithOrWothout_ID ; ", connection)) 
     { 
      DataTable tbl_Beef = new DataTable(); 
      adapter.Fill(tbl_Beef); 

      lst_SHowdata.DisplayMember = "Beef_Name"; 
      lstSHowdata2.DisplayMember = "Beef_Price"; 

      lst_SHowdata.ValueMember = "Beef_ID"; 
      lst_SHowdata.ValueMember = "Chicken_ID"; 

      lst_SHowdata.DataSource = tbl_Beef; 
      lstSHowdata2.DataSource = tbl_Beef; 
     }  
} 

private void button1_Click(object sender, EventArgs e) 
{ 
    Chicken(); 
} 

private void button2_Click(object sender, EventArgs e) 
{ 
    Beef(); 
} 

，我試圖通過使爲使異常

//lst_SHowdata.ValueMember = "Chicken_ID"; 
// lst_SHowdata.ValueMember = "Beef_ID"; 

還挺已經固定線路註釋，以解決它，但我需要點擊按鈕兩次，當我點擊它的第一次它會顯示在列表框System.Data.DataRowView。 如何解決它，並使其只顯示在第一次點擊？

Answer 1

糾正我，如果我錯了。這是如何理解它。 您正試圖將數據綁定到按鈕單擊上的列表框。 你有2個列表框控件綁定到。

在分配成員之前先分配數據源。它無法綁定，因爲它尚未被賦予數據源。

private void Chicken() 
    { 
      using (connection = new SqlConnection(connectionString)) 
      using (SqlDataAdapter adapter = new SqlDataAdapter("select Chicken_Name,WithOrWithout_Name,Chicken_Price from Tbl_Add a full outer join tbl_Chicken b ON b.Chicken_ID = a.Chicken_ID full outer join Tbl_WithORWithot c ON a.WorWO_ID = c.WithOrWothout_ID ; ", connection)) 
     { 
      DataTable tbl_Chicken = new DataTable(); 
      connection.Open(); //opens the connection 
      adapter.Fill(tbl_Chicken); 
      connection.Close(); //Closes the connection 

      lst_SHowdata.DataSource = tbl_Chicken; //assigns a datasource 
      lst_SHowdata.DisplayMember = "Chicken_Name"; //assigns display 
      lst_SHowdata.ValueMember = "Chicken_ID"; //assigns id 


      lst_SHowdata2.DataSource = tbl_Chicken; 
      lst_SHowdata2.DisplayMember ="Chicken_Price"; 
      lst_SHowdata2.ValueMember = "Chicken_ID"; 

     } 
    } 

    private void Beef() 
    { 
    using (connection = new SqlConnection(connectionString)) 
    using (SqlDataAdapter adapter = new SqlDataAdapter("select Beef_Name,WithOrWithout_Name ,Beef_Price from Tbl_Add a full outer join Tbl_Beef b ON b.Beef_ID = a.Beef_ID full outer join Tbl_WithORWithout c ON a.WorWO_ID = c.WithOrWothout_ID ; ", connection)) 
     { 
     DataTable tbl_Beef = new DataTable(); 
     connection.Open(); 
     adapter.Fill(tbl_Beef); 
     connection.Close(); 

     lst_SHowdata.DataSource = tbl_Beef 
     lst_SHowdata.DisplayMember = "Beef_Name"; 
     lst_SHowdata.ValueMember = "Beef_ID"; 

     lst_SHowdata2.DataSource = tbl_Beef; 
     lst_SHowdata2.ValueMember = "Beef_ID"; 
     lst_SHowdata2.DisplayMember = "Beef_Price"; 
    }  
} 

Answer 2

因爲當您嘗試將ValueMember設置爲「Bee_Name」時，該列表綁定到tbl_chicken，而tbl_chicken沒有Beef_Name，因此它正確地投訴。

要解決此問題，請將數據源設置爲tbl_beef，然後設置ValueMember。

Answer 3

錯誤是因爲valuemember是「Beef_ID」和「Chicken_ID」。這些在數據表中不可用。您需要將其更改爲「Beef_Name」或在sql select語句中包含「Beef_ID」。 也爲同一個列表框設置兩個不同的值成員。

Answer 4

正確的代碼^^它

private void Chicken() 
    { 
     using (connection = new SqlConnection(connectionString)) 
     using (SqlDataAdapter adapter = new SqlDataAdapter("select * from Tbl_Add a full outer join tbl_Chicken b ON b.Chicken_ID = a.Chicken_ID full outer join Tbl_WithORWithot c ON a.WorWO_ID = c.WithOrWothout_ID ; ", connection)) 
     { 
      DataTable tbl_Chicken = new DataTable(); 
      connection.Open(); //opens the connection 
      adapter.Fill(tbl_Chicken); 
      connection.Close(); //Closes the connection 

      lst_Menu.DataSource = tbl_Chicken; //assigns a datasource 
      lst_Menu.DisplayMember = "Chicken_Name"; //assigns display 
      lst_Menu.ValueMember = "Chicken_Name"; 

      lst_worwout.DataSource = tbl_Chicken; 
      lst_worwout.DisplayMember = "WithOrWithout_Name"; 
      lst_worwout.ValueMember = "WithOrWithout_Name"; 

      lst_Price.DataSource = tbl_Chicken; 
      lst_Price.DisplayMember = "Chicken_Price"; 
      lst_Price.ValueMember = "Chicken_Price"; 


     } 
    }