Why DataGridTableStyle ccc = new DataGridTableStyle (); returns empty object

boss1997

dataGrid1.DataSource = temp_1; bound data source dataGrid displays normally
DataGridTableStyle ccc = new DataGridTableStyle ();
ccc = dataGrid1.TableStyles ["temp_1"]; Get TableStyles object of dataGrid1
Why can't I get the TableStyles object when the screen has displayed data?

苹果小刀

When TABLESTYLES.COUNT in DATAGRID is greater than 0, the style sheet exists. Similarly, you can also determine the value of GridColumnStyles.Count. Just set the DataSource. Although it can be displayed, it cannot refer to its TableStyle.
   Create TableStyle at design time, or execute a sentence:
   TableStyle ts = new TableStyle ();
   DataGrid1.TableStyles.add (ts);

kalian2000

By default, the collection returned by the TableStyles property does not contain any DataGridTableStyle objects.

ak41sl

The value of the TableStyles property must be set first.

逍遥恶魔

Before binding, you should add a DataGridTableStyle