A method of bidirectional sorting in a DataGrid

datagrid| sorting in. Net The DataGrid has the ability to sort, but does not support bidirectional sorting. Use, read some related posts, I tried a method, unexpectedly also can make sense, hehe

The main is to use Datagrid.attributes to save a parameter, at the same time in Onsortcommand modified DataGridColumn sortexpression. The code is as follows:

private void Binddata ()
{
DataTable dt = ...;
if (dt!= null)
{
DataView dv = dt. DefaultView;
if (datagrid1.attributes["sortby"]!= null)
{
Dv. Sort = datagrid1.attributes["SortBy"];
}

DataGrid1.DataSource = DV;
Datagrid1.databind ();
}
}

private void Datagridsort (object source, System.Web.UI.WebControls.DataGridSortCommandEventArgs e)
{
datagrid1.attributes["sortby"] = sortstr;
This. Binddata ();

Find the sorted column and modify the sort attribute to put it

DataGridColumn CLM = null;

for (int i=0;i<datagrid1.columns.count;i++)
{
if (datagrid1.columns[i). SortExpression = = e.sortexpression)
{
CLM = Datagrid1.columns[i];
Break
}
}

if (CLM = null) return;

if (E.sortexpression.tolower (). IndexOf ("desc") > 0)
{
Clm. SortExpression = E.sortexpression.tolower (). Replace ("desc", "ASC");
}
Else
{
if (E.sortexpression.tolower (). IndexOf ("ASC") > 0)
{
Clm. SortExpression = E.sortexpression.tolower (). Replace ("ASC", "desc");
}
Else
{
Clm. SortExpression = E.sortexpression.tolower () + "desc";
}
}
}