When you select a row in the DataGrid and scroll it out of view using the mouse wheel, you cannot get it back into view. Here is a workaround.
dataGrid1.MouseWheel += new MouseEventHandler( dataGrid1_MouseWheel );
// ...
private void dataGrid1_MouseWheel( object sender, MouseEventArgs e )
{
dataGrid1.Select();
}
Contributed from George Shepherd's Windows Forms FAQ
Q:
How do I determine the DataGridTableStyle.MappingName that should used for a DataGrid to make sure the grid uses a custom table style?
The DataGrid looks for a DataGridTableStyle.MappingName that is the type name of its DataSource. So, depending upon what DataSource you are using, this may be "ArrayList" for an ArrayList, "SomeType[]" for an array of SomeType objects, or "MyTableName" for a DataTable.
Here is a code snippet that you can use to see exactly what MappingName is required for your DataSource.
[C#]
void ShowMappingName( object src )
{
IList list = null;
Type type = null;
if ( src is Array )
{
type = src.GetType();
list = src as IList;
}
else
{
if ( src is IListSource )
src = (src as IListSource).GetList();
if ( src is IList )
{
type = src.GetType();
list = src as IList;
}
else
{
MessageBox.Show( "error" );
return;
}
}
if ( list is ITypedList )
MessageBox.Show( (list as ITypedList).GetListName( null ) );
else
MessageBox.Show( type.Name );
}
[Visual Basic]
Private Sub ShowMappingName(ByVal src As Object)
Dim list As IList = Nothing
Dim type As Type = Nothing
If TypeOf (src) Is Array Then
type = src.GetType()
list = CType(src, IList)
Else
If TypeOf src Is IListSource Then
src = CType(src, IListSource).GetList()
End If
If TypeOf src Is IList Then
type = src.GetType()
list = CType(src, IList)
Else
MessageBox.Show("Error")
Return
End If
End If
If TypeOf list Is ITypedList Then
MessageBox.Show(CType(list, ITypedList).GetListName(Nothing))
Else
MessageBox.Show(type.Name)
End If
End Sub
The method would be used like this.
ShowMappingName( dataGrid1.DataSource );
George Shepherd, Syncfusion, and NoiseEHC
Q:
How do I access other values in other columns of a DataGrid from the Paint override of a class derived from DataGridColumnStyle?
You can get a reference to the DataGrid like this.
Dim grid As DataGrid = DataGridTableStyle.DataGrid
Once you have the grid, you can use an indexer to get the value of any particular column on the same row.
Dim someValue as Object = grid(rowNum, 5) ' value in column 5....
Contributed from George Shepherd's Windows Forms FAQ
