ClipboardAccessPolicy.Failed Event

Allows you to respond to associated failures.

Namespace: DevExpress.Data.Utils

Assembly: DevExpress.Data.Desktop.v23.2.dll

NuGet Packages: DevExpress.Data.Desktop, DevExpress.ExpressApp.Win.Design

Declaration

C#

public static event EventHandler<ClipboardAccessPolicy.FailedEventArgs> Failed

VB.NET

Public Shared Event Failed As EventHandler(Of ClipboardAccessPolicy.FailedEventArgs)

Event Data

The Failed event's data class is ClipboardAccessPolicy.FailedEventArgs. The following properties provide information specific to this event:

Property	Description
DataFormat	Gets the data format. Inherited from ClipboardAccessPolicy.ClipboardOperationEventArgs.
DataObject	Gets an object that defines a format-independent mechanism for transferring data. Inherited from ClipboardAccessPolicy.ClipboardOperationEventArgs.
Exception	Gets the exception.
IsClearOperation	Gets a value that indicates whether the clipboard clear operation is being processed. Inherited from ClipboardAccessPolicy.ClipboardOperationEventArgs.
IsCopyOperation	Gets a value that indicates whether the copy-to-clipboard operation is being processed. Inherited from ClipboardAccessPolicy.ClipboardOperationEventArgs.
IsPasteOperation	Gets a value that indicates whether the paste-from-clipboard operation is being processed. Inherited from ClipboardAccessPolicy.ClipboardOperationEventArgs.
Operation	Gets the clipboard-related operation being processed. Inherited from ClipboardAccessPolicy.ClipboardOperationEventArgs.
Throw	Gets or sets whether to throw an exception.

The event data class exposes the following methods:

Method	Description
ToString()	Returns a string representation of the current object.

Remarks

The ThrowAlways() method disables all clipboard-related operations (copy, paste, clear) in DevExpress WinForms and WPF controls. The Clipboard Access Policy throws an exception when a user or UI control attempts to perform an operation with the clipboard.

Handle the Failed event to respond to associated failures:

C#

using System;
using System.Windows.Forms;
using DevExpress.Data.Utils;

namespace DXApplication {
    internal static class Program {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main() {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            ClipboardAccessPolicy.ThrowAlways();
            ClipboardAccessPolicy.Failed += ClipboardAccessPolicy_Failed;
            Application.Run(new Form1());
        }
        private static void ClipboardAccessPolicy_Failed(object sender, ClipboardAccessPolicy.FailedEventArgs e) {
            if (e.DataFormat == DataFormats.Text)
                e.Throw = false;
        }
    }
}

VB.NET

Imports System
Imports System.Windows.Forms
Imports DevExpress.Data.Utils

Namespace DXApplication
    Friend Module Program
        ''' <summary>
        ''' The main entry point for the application.
        ''' </summary>
        <STAThread>
        Sub Main()
            Application.EnableVisualStyles()
            Application.SetCompatibleTextRenderingDefault(False)
            ClipboardAccessPolicy.ThrowAlways()
            AddHandler ClipboardAccessPolicy.Failed, AddressOf ClipboardAccessPolicy_Failed
            Application.Run(New Form1())
        End Sub
        Private Sub ClipboardAccessPolicy_Failed(ByVal sender As Object, ByVal e As ClipboardAccessPolicy.FailedEventArgs)
            If e.DataFormat = DataFormats.Text Then
                e.Throw = False
            End If
        End Sub
    End Module
End Namespace

Read the following topic for additional information: Clipboard Access Policy.