如何更改数据表列中的特定数据？

Question

我已经使用DataAdapter填充了一个DataTable，但是我想动态更改DataTable中该列中所有行的值。我如何去做这件事？

这里是我当前的代码：

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(); 

感谢

Answer 1

一切看起来除非通过迭代行，您可以访问像这样的列好...

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

Answer 2

您需要填写，然后再改变！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(); 

马克