I'm really hoping someone can help me out here. I have a DataGrid in my program that has a checkbox column. The ItemsSource for the DataGrid is a DataSet loaded programmatically. When I select a couple of items in the DataGrid and then scroll it, I get some very odd behavior. For example, when I check two of the CheckBoxes, it tells me that I have "2 selected", but then if I scroll up or down in the DataGrid, the number changes. If I scroll back to the initial position it goes back to the "2 selected". As odd as it sounds, it seems like it's calling the Checked/Unchecked events when I scroll the box...very odd...
I have the following defined at the top of my code:
private DataSet MyDataSet;
int selected_count = 0;
Then I have the following code in my method to load the information into the DataSet:
MyDataSet = new DataSet();
DataTable tempDataTable = new DataTable();
MyDataSet.Tables.Add(tempDataTable);
DataColumn tempCol = new DataColumn("Checked", typeof(bool));
tempDataTable.Columns.Add(tempCol);
for (int i = 0; i < 50; i++)
{
DataRow tempRow = tempDataTable.NewRow();
tempDataTable.Rows.Add(tempRow);
tempRow["Checked"] = false;
}
MyList.ItemsSource = MyDataSet.Tables[0].DefaultView;
I have the IsChecked property binded to the DataColumn named "Checked" using the following XAML:
<dtgrd:DataGrid x:Name="MyList" AutoGenerateColumns="False" CanUserAddRows="False" CanUserResizeRows="False" HeadersVisibility="Column" SelectionUnit="FullRow" HorizontalGridLinesBrush="#FF688CAF" VerticalGridLinesBrush="#FF688CAF">
<dtgrd:DataGrid.Columns>
<dtgrd:DataGridTemplateColumn x:Name="CheckCol" CanUserSort="True" CanUserResize="False">
<dtgrd:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<CheckBox Name="MyCheckBox" IsChecked="{Binding Checked}" HorizontalAlignment="Center" VerticalAlignment="Center" Checked="MyCheckBox_Checked" Unchecked="MyCheckBox_Unchecked" />
</DataTemplate>
</dtgrd:DataGridTemplateColumn.CellTemplate>
</dtgrd:DataGridTemplateColumn>
</dtgrd:DataGrid.Columns>
</dtgrd:DataGrid>
Then, I have the following events that are called by checking/unchecking one of the checkboxes:
private void MyCheckBox_Checked(object sender, RoutedEventArgs e)
{
selected_count++;
TxtSelectedCount.Text = "" + selected_count + " selected";
}
private void MyCheckBox_Unchecked(object sender, RoutedEventArgs e)
{
selected_count--;
TxtSelectedCount.Text = "" + selected_count + " selected";
}
I have also tried other things, but get different bugs. For example, I removed the Binding from the XAML code and tried to set it programmatically using the following Checked/Uncheck events:
private void MyCheckBox_Checked(object sender, RoutedEventArgs e)
{
DataRow tempRow = MyDataSet.Tables[0].Rows[MyList.Items.IndexOf(MyList.SelectedItems[0])];
tempRow["Checked"] = true;
selected_count++;
TxtSelectedCount.Text = "" + selected_count + " selected";
}
private void MyCheckBox_Unchecked(object sender, RoutedEventArgs e)
{
DataRow tempRow = MyDataSet.Tables[0].Rows[MyList.Items.IndexOf(MyList.SelectedItems[0])];
tempRow["Checked"] = false;
selected_count--;
TxtSelectedCount.Text = "" + selected_count + " selected";
}
When I use that code, the number of checked items stays the same, but the actual checks move around to different items while I'm scrolling.
I honestly have no clue what's going on, but it's very frustrating! Any help would be GREATLY appreciated!