如何更改數據表列中的特定數據？

Question

我已經使用DataAdapter填充了一個DataTable，但是我想動態更改DataTable中該列中所有行的值。我如何去做這件事？

這裏是我當前的代碼：

SqlConnection conn = null; 
string sSQL = ""; 
string connString = "Datasourceetc"; 

sSQL = "SELECT TEST_ID FROM TEST_TABLE"; 

SqlDataAdapter sda = new SqlDataAdapter(sSQL, conn); 

DataTable dt = new DataTable(); 

sda.Fill(dt); 

foreach (DataRow row in dt.Rows) 
{ 
    dt.Columns["TEST_ID"] = "changed"; //Not changing it?! 
} 

GridView1.DataSource = dt; 

GridView1.DataBind(); 

感謝

Answer 1

一切看起來除非通過迭代行，您可以訪問像這樣的列好...

foreach (DataRow row in dt.Rows) 
{ 
    row["ColumnName"] = "changed"; //Not changing it?! 
} 

Answer 2

您需要填寫，然後再改變！上述

SqlConnection conn = new SqlConnection(connString); 
string sSQL = "SELECT TEST_ID FROM TEST_TABLE"; 

DataTable dt = new DataTable(); 

SqlDataAdapter sda = new SqlDataAdapter(sSQL, conn); 

// fill the DataTable - now you should have rows and columns! 
sda.Fill(dt); 

// one you've filled your DataTable, you should be able 
// to iterate over it and change values 
foreach (DataRow row in dt.Rows) 
{ 
    row["TEST_ID"] = "changed"; //Not changing it?! 
} 

GridView1.DataSource = dt; 
GridView1.DataBind(); 

馬克