ClipboardAccessPolicy.ThrowAlways() Method

Applies a policy that suppresses all clipboard-related operations in DevExpress WinForms and WPF controls.

Namespace: DevExpress.Data.Utils

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

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

Declaration

C#

public static void ThrowAlways()

VB.NET

Public Shared Sub ThrowAlways

Remarks

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

Use AllowOperation and/or AllowDataFormats methods to enable specific operations for all or certain data formats when the restrictive policy is enabled.

C#

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

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.AllowOperation(ClipboardOperation.Copy, DataFormats.Text);
            ClipboardAccessPolicy.ThrowAlways();
            Application.Run(new Form1());
        }
    }
}

VB.NET

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

Namespace DXApplication
    Friend Module Program
        ''' <summary>
        ''' The main entry point for the application.
        ''' </summary>
        <STAThread>
        Sub Main()
            Application.EnableVisualStyles()
            Application.SetCompatibleTextRenderingDefault(False)
            ClipboardAccessPolicy.AllowOperation(ClipboardOperation.Copy, DataFormats.Text)
            ClipboardAccessPolicy.ThrowAlways()
            Application.Run(New Form1())
        End Sub
    End Module
End Namespace

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.