如何通过for循环从DataTable中检索n个行

Question

Hi i am facing problem while i am trying to retrieve the data from the database which encrypted, during sending data into database.

Now i want decrypted the data during retrieving time and view it in Data grid-view control. I have decrpyt function as well which is like decrypted(string Decrypting);. But the issue is i am not able to implement the Loop and implement the decrypted function so that i can get actual data into data Grid-View control. Please help me that will be appreciated.

  public void SelectData() {   try    {  DataTable dt = new SQLTool().ExecuteOutput("Select * from CustomerTable where Date  between '" + TextBox1.Text.Trim() + "' and '" + TextBox2.Text.Trim() + "'");       

        gvCustomerDetails.DataSource = dt;           

    }
    catch (Exception)
    {

    }

    //Button2.Enabled = true;
    //Button1.Enabled = false;


}

Answer 1

在将dt作为数据源分配给数据网格之前，可以解密dt中的数据并进行更新。

Answer 2

You need to loop through every record and place at the smae spot

Just Try Adding

for (int i = 0; i < dt.Rows.Count; i++)
{
for (int j = 0; j < dt.Columns.Count; j++)
{
    dt.Rows[i][j] = decrypted(dt.Rows[i][j].ToString());
}
}

Answer 3

Try this

for (int i = 0; i < dt.Rows.Count; i++)
{
   for (int j = 0; j < dt.Columns.Count; j++)
   {
       dt.Rows[i]["column_name"] = YourDecriptionFunction(dt.Rows[i]["column_name"].ToString());
   }
}

Answer 4

Try something like this:

dt.Rows.AsEnumerable().ForEach(x => dt.Columns.ToList().ForEach(y => dt.Rows[x][y] = decryptedFunction(dt.Rows[x][y].ToString())))

**Is untested, but it's suppose to go through every row and columns decrypting and storing in the same row, column