Редагувати

Поділитися через

DataRowChangeEventHandler Delegate

  • Reference

Definition

Namespace:
System.Data
Assembly:
System.Data.Common.dll
Assembly:
System.Data.dll
Assembly:
netstandard.dll

Represents the method that will handle the RowChanging, RowChanged, RowDeleting, and RowDeleted events of a DataTable.

public delegate void DataRowChangeEventHandler(System::Object ^ sender, DataRowChangeEventArgs ^ e);
public delegate void DataRowChangeEventHandler(object sender, DataRowChangeEventArgs e);
type DataRowChangeEventHandler = delegate of obj * DataRowChangeEventArgs -> unit
Public Delegate Sub DataRowChangeEventHandler(sender As Object, e As DataRowChangeEventArgs)

Parameters

sender
Object

The source of the event.

e
DataRowChangeEventArgs

A DataRowChangeEventArgs that contains the event data.

Examples

The following example adds a DataRowChangeEventHandler and the procedure to handle the event when a row is changed. The procedure prints the action and value of the changed row.

private DataTable dataTable;

private void AddHandler(){
   dataTable = new DataTable("dataTable");
   dataTable.RowChanged +=
      new System.Data.DataRowChangeEventHandler(dataTable_Changed);
}

private void dataTable_Changed(object sender,
System.Data.DataRowChangeEventArgs e)
{
   Console.WriteLine("Row Changed", e.Action,
      e.Row[dataGrid1.CurrentCell.ColumnNumber]);
}

Private dataTable As DataTable    
   
Private Sub [AddHandler]()
    dataTable = New DataTable("dataTable")
    AddHandler dataTable.RowChanged, AddressOf dataTable_Changed
End Sub    
   
Private Sub dataTable_Changed _
   (sender As Object, e As System.Data.DataRowChangeEventArgs)

    Console.WriteLine("Row Changed", e.Action, _
       e.Row(dataGrid1.CurrentCell.ColumnNumber))
End Sub

Remarks

When you create a DataRowChangeEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, until you remove the delegate. For more information about delegates, see Handling and Raising Events.

Extension Methods

GetMethodInfo(Delegate)

Gets an object that represents the method represented by the specified delegate.

Applies to

See also