LocalMessageSender Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Represents the sending end of a local messaging channel between two Silverlight-based applications.

Inheritance Hierarchy

System.Object
  System.Windows.Messaging.LocalMessageSender

Namespace:  System.Windows.Messaging
Assembly:  System.Windows (in System.Windows.dll)

Syntax

'Declaration
Public NotInheritable Class LocalMessageSender

public sealed class LocalMessageSender

The LocalMessageSender type exposes the following members.

Constructors

	Name	Description
	LocalMessageSender(String)	Initializes a new instance of the LocalMessageSender class and configures it to send messages to the receiver with the specified name.
	LocalMessageSender(String, String)	Initializes a new instance of the LocalMessageSender class and configures it to send messages to the receiver with the specified name and domain.

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Properties

	Name	Description
	ReceiverDomain	Gets the domain of the LocalMessageReceiver that this sender will send messages to.
	ReceiverName	Gets the name of the LocalMessageReceiver that this sender will send messages to.

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Methods

	Name	Description
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	SendAsync(String)	Sends the specified message to the configured receiver asynchronously.
	SendAsync(String, Object)	Sends the specified messages to the configured receiver asynchronously.
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Events

	Name	Description
	SendCompleted	Occurs when the message has been successfully sent.

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Fields

	Name	Description
	Global	A value that represents the global domain.

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Remarks

A LocalMessageSender object can send messages to a LocalMessageReceiver object in a different Silverlight-based application running on the same computer. For information about using these classes, see Communication Between Local Silverlight-Based Applications.

Examples

The following code example demonstrates how to use this class. This example is part of a larger example available in How to: Implement Communication Between Local Silverlight-Based Applications.

Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Messaging

Partial Public Class Sender
    Inherits UserControl

    Private messageSender As LocalMessageSender

    Public Sub New()

        InitializeComponent()
        UpdateButton()
        messageSender = New LocalMessageSender( _
            "receiver", LocalMessageSender.Global)
        AddHandler messageSender.SendCompleted, _
            AddressOf sender_SendCompleted
        SendMessage("message from Sender constructor")

    End Sub

    Private clickNumber As Integer = 1

    Private Sub UpdateButton()
        button.Content = "send message 'click " & clickNumber & "'"
    End Sub

    Private Sub Button_Click(ByVal sender As Object, _
        ByVal e As RoutedEventArgs)

        SendMessage("click " & clickNumber)
        clickNumber += 1
        UpdateButton()

    End Sub

    Private Const MAX_ATTEMPTS As Integer = 10000
    Private attempt As Integer = 1

    Private Sub SendMessage(ByVal message As String)
        messageSender.SendAsync(message, attempt)
    End Sub

    Private Sub sender_SendCompleted(ByVal sender As Object, _
        ByVal e As SendCompletedEventArgs)

        If e.Error IsNot Nothing Then

            LogError(e)
            attempt += 1
            If attempt > MAX_ATTEMPTS Then
                output.Text = "Could not send message."
                Return
            End If
            SendMessage(e.Message)
            Return

        End If

        output.Text = _
            "Message: " & e.Message & Environment.NewLine & _
            "Attempt " & CType(e.UserState, Integer) & _
            " completed." & Environment.NewLine & _
            "Response: " & e.Response & Environment.NewLine & _
            "ReceiverName: " & e.ReceiverName & Environment.NewLine & _
            "ReceiverDomain: " & e.ReceiverDomain

        ' Reset attempt counter.
        attempt = 1

    End Sub

    Private Sub LogError(ByVal e As SendCompletedEventArgs)
        System.Diagnostics.Debug.WriteLine( _
            "Attempt number {0}: {1}: {2}", CType(e.UserState, Integer), _
            e.Error.GetType().ToString(), e.Error.Message)
    End Sub

End Class

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Messaging;

namespace SendingApplication
{
    public partial class Sender : UserControl
    {
        private LocalMessageSender messageSender;

        public Sender()
        {
            InitializeComponent();
            UpdateButton();
            messageSender = new LocalMessageSender(
                "receiver", LocalMessageSender.Global);
            messageSender.SendCompleted += sender_SendCompleted;
            SendMessage("message from Sender constructor");
        }

        private int clickNumber = 1;

        private void UpdateButton()
        {
            button.Content = "send message 'click " + clickNumber + "'";
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            SendMessage("click " + clickNumber);
            clickNumber++;
            UpdateButton();
        }

        private const int MAX_ATTEMPTS = 10000;
        private int attempt = 1;

        private void SendMessage(string message)
        {
            messageSender.SendAsync(message, attempt);
        }

        private void sender_SendCompleted(object sender, SendCompletedEventArgs e)
        {
            if (e.Error != null)
            {
                LogError(e);
                attempt++;
                if (attempt > MAX_ATTEMPTS)
                {
                    output.Text = "Could not send message.";
                    return;
                }
                SendMessage(e.Message);
                return;
            }

            output.Text =
                "Message: " + e.Message + Environment.NewLine +
                "Attempt " + (int)e.UserState + 
                " completed." + Environment.NewLine +
                "Response: " + e.Response + Environment.NewLine +
                "ReceiverName: " + e.ReceiverName + Environment.NewLine + 
                "ReceiverDomain: " + e.ReceiverDomain;

            // Reset attempt counter.
            attempt = 1;
        }

        private void LogError(SendCompletedEventArgs e)
        {
            System.Diagnostics.Debug.WriteLine(
                "Attempt number {0}: {1}: {2}", (int)e.UserState, 
                e.Error.GetType().ToString(), e.Error.Message);
        }

    }
}

Version Information

Silverlight

Supported in: 5, 4, 3

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

See Also

Reference

System.Windows.Messaging Namespace

LocalMessageReceiver

Other Resources

Communication Between Local Silverlight-Based Applications

How to: Implement Communication Between Local Silverlight-Based Applications