How to Format DataTable Column after load Datatable without extra loop ??

Question

How to Format Column after load Datatable without extra loop ??
I dont want to do extra logic which can cause performance thing.
I have datatable which get fill from Dataset after database query, now i need to format column as decimal but without extra logic.
I was thinking to create clone and than Import row loop but it ll kill performance, its WPF application.
Thanks
Jumpingboy

Answer 1

You cannot do any custom things at all without doing some "extra logic". Formatting a number as decimal is certainly not a performance killer in any way whatsoever though.
If you are displaying the contents of the DataTable in a DataGrid you could specify a StringFormat in the XAML:
<DataGrid x:Name="dg1" AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Header="Number" Binding="{Binding num, StringFormat=N2}"/>
</DataGrid.Columns>
</DataGrid>
Or if you are using auto-generated columns you could handle the AutoGeneratingColumn event:
public MainWindow() {
InitializeComponent();
DataTable table1 = new DataTable();
table1.Columns.Add(new DataColumn("num")
DataType = typeof(decimal)
table1.Rows.Add(1.444444444444);
table1.Rows.Add(7.444444444444);
dg1.ItemsSource = table1.DefaultView;
dg1.AutoGeneratingColumn += dg1_AutoGeneratingColumn;
void dg1_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e) {
if (e.PropertyName == "num") {
DataGridTextColumn column = e.Column as DataGridTextColumn;
column.Binding.StringFormat = "N2";
<DataGrid x:Name="dg1" />
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