Message.Body 屬性
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
取得或設定訊息的內容。
public:
property System::Object ^ Body { System::Object ^ get(); void set(System::Object ^ value); };[System.ComponentModel.Browsable(false)]
public object Body { get; set; }[<System.ComponentModel.Browsable(false)>]
member this.Body : obj with get, setPublic Property Body As Object屬性值
指定訊息內容的物件。 物件可以是字串、日期、貨幣、數字、位元組陣列或任何 Managed 物件。
- 屬性
例外狀況
範例
下列程式代碼範例會將不同優先順序的兩則訊息傳送至佇列，然後擷取它們。
#using <system.dll>
#using <system.messaging.dll>
using namespace System;
using namespace System::Messaging;
/// <summary>
/// Provides a container class for the example.
/// </summary>
ref class MyNewQueue
{
//**************************************************
// Sends a string message to a queue.
//**************************************************
public:
void SendMessage( MessagePriority priority, String^ messageBody )
{
// Connect to a queue on the local computer.
MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" );
// Create a new message.
Message^ myMessage = gcnew Message;
if ( priority > MessagePriority::Normal )
{
myMessage->Body = "High Priority: {0}",messageBody;
}
else
{
myMessage->Body = messageBody;
}
// Set the priority of the message.
myMessage->Priority = priority;
// Send the Order to the queue.
myQueue->Send( myMessage );
return;
}
//**************************************************
// Receives a message.
//**************************************************
void ReceiveMessage()
{
// Connect to the a queue on the local computer.
MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" );
// Set the queue to read the priority. By default, it
// is not read.
myQueue->MessageReadPropertyFilter->Priority = true;
// Set the formatter to indicate body contains a String^.
array<Type^>^ p = gcnew array<Type^>(1);
p[ 0 ] = String::typeid;
myQueue->Formatter = gcnew XmlMessageFormatter( p );
try
{
// Receive and format the message.
Message^ myMessage = myQueue->Receive();
// Display message information.
Console::WriteLine( "Priority: {0}",
myMessage->Priority );
Console::WriteLine( "Body: {0}",
myMessage->Body );
}
catch ( MessageQueueException^ )
{
// Handle Message Queuing exceptions.
}
// Handle invalid serialization format.
catch ( InvalidOperationException^ e )
{
Console::WriteLine( e->Message );
}
// Catch other exceptions as necessary.
return;
}
};
//**************************************************
// Provides an entry point into the application.
//
// This example sends and receives a message from
// a queue.
//**************************************************
int main()
{
// Create a new instance of the class.
MyNewQueue^ myNewQueue = gcnew MyNewQueue;
// Send messages to a queue.
myNewQueue->SendMessage( MessagePriority::Normal, "First Message Body." );
myNewQueue->SendMessage( MessagePriority::Highest, "Second Message Body." );
// Receive messages from a queue.
myNewQueue->ReceiveMessage();
myNewQueue->ReceiveMessage();
return 0;
}
using System;
using System.Messaging;
namespace MyProject
{
/// <summary>
/// Provides a container class for the example.
/// </summary>
public class MyNewQueue
{
//**************************************************
// Provides an entry point into the application.
//
// This example sends and receives a message from
// a queue.
//**************************************************
public static void Main()
{
// Create a new instance of the class.
MyNewQueue myNewQueue = new MyNewQueue();
// Send messages to a queue.
myNewQueue.SendMessage(MessagePriority.Normal, "First Message Body.");
myNewQueue.SendMessage(MessagePriority.Highest, "Second Message Body.");
// Receive messages from a queue.
myNewQueue.ReceiveMessage();
myNewQueue.ReceiveMessage();
return;
}
//**************************************************
// Sends a string message to a queue.
//**************************************************
public void SendMessage(MessagePriority priority, string messageBody)
{
// Connect to a queue on the local computer.
MessageQueue myQueue = new MessageQueue(".\\myQueue");
// Create a new message.
Message myMessage = new Message();
if(priority > MessagePriority.Normal)
{
myMessage.Body = "High Priority: " + messageBody;
}
else
{
myMessage.Body = messageBody;
}
// Set the priority of the message.
myMessage.Priority = priority;
// Send the Order to the queue.
myQueue.Send(myMessage);
return;
}
//**************************************************
// Receives a message.
//**************************************************
public void ReceiveMessage()
{
// Connect to the a queue on the local computer.
MessageQueue myQueue = new MessageQueue(".\\myQueue");
// Set the queue to read the priority. By default, it
// is not read.
myQueue.MessageReadPropertyFilter.Priority = true;
// Set the formatter to indicate body contains a string.
myQueue.Formatter = new XmlMessageFormatter(new Type[]
{typeof(string)});
try
{
// Receive and format the message.
Message myMessage = myQueue.Receive();
// Display message information.
Console.WriteLine("Priority: " +
myMessage.Priority.ToString());
Console.WriteLine("Body: " +
myMessage.Body.ToString());
}
catch (MessageQueueException)
{
// Handle Message Queuing exceptions.
}
// Handle invalid serialization format.
catch (InvalidOperationException e)
{
Console.WriteLine(e.Message);
}
// Catch other exceptions as necessary.
return;
}
}
}
Imports System.Messaging
'Provides a container class for the example.
Public Class MyNewQueue
' Provides an entry point into the application.
'
' This example sends and receives a message from
' a queue.
Public Shared Sub Main()
' Create a new instance of the class.
Dim myNewQueue As New MyNewQueue()
' Send messages to a queue.
myNewQueue.SendMessage(MessagePriority.Normal, "First Message Body.")
myNewQueue.SendMessage(MessagePriority.Highest, "Second Message Body.")
' Receive messages from a queue.
myNewQueue.ReceiveMessage()
myNewQueue.ReceiveMessage()
Return
End Sub
' Sends a string message to a queue.
Public Sub SendMessage(priority As MessagePriority, messageBody As String)
' Connect to a queue on the local computer.
Dim myQueue As New MessageQueue(".\myQueue")
' Create a new message.
Dim myMessage As New Message()
If priority > MessagePriority.Normal Then
myMessage.Body = "High Priority: " + messageBody
Else
myMessage.Body = messageBody
End If
' Set the priority of the message.
myMessage.Priority = priority
' Send the Order to the queue.
myQueue.Send(myMessage)
Return
End Sub
' Receives a message.
Public Sub ReceiveMessage()
' Connect to the a queue on the local computer.
Dim myQueue As New MessageQueue(".\myQueue")
' Set the queue to read the priority. By default, it
' is not read.
myQueue.MessageReadPropertyFilter.Priority = True
' Set the formatter to indicate body contains a string.
myQueue.Formatter = New XmlMessageFormatter(New Type() {GetType(String)})
Try
' Receive and format the message.
Dim myMessage As Message = myQueue.Receive()
' Display message information.
Console.WriteLine(("Priority: " + myMessage.Priority.ToString()))
Console.WriteLine(("Body: " + myMessage.Body.ToString()))
' Handle invalid serialization format.
Catch e As InvalidOperationException
Console.WriteLine(e.Message)
End Try
' Catch other exceptions as necessary.
Return
End Sub
End Class
備註
訊息的 Body 屬性通常包含與訊息相關聯的數據。 雖然您也可以在 和 Extension 屬性中AppSpecific傳送應用程式特定數據，但您應該盡可能在訊息的 中包含Body訊息數據。 Body只有屬性內容會串行化或加密。
Body屬性可以包含大小不超過 4 MB 的任何物件。 如果您使用 MessageQueue.Send 將不是 型Message別的任何物件傳送至 MessageQueue，該對象會位於 Body 或Receive所Peek傳回之 實例的 Message 屬性中。
中的 MessageQueue.Send("hello.") 字串自變數是這類泛型物件的範例。
屬性 BodyType 會指出儲存在訊息本文中的資訊類型。 消息佇列會使用這項資訊來識別 Body 屬性內容類型。
在傳送Message物件之前，Body請先指定 屬性或 BodyStream 屬性。 屬性 Body 可以是任何可串行化的物件，例如文字字串、結構對象、類別實例或內嵌物件。
除非您將訊息的內容直接 BodyStream 寫入 屬性，否則請先 Formatter 設定 屬性，再傳送訊息。 Send在實例上MessageQueue呼叫 方法時，主體會使用 屬性中包含的Formatter格式子串行化。 如果您傳送訊息而不指定 屬性的值 Formatter ，格式子預設為 XmlMessageFormatter。
注意
試著將訊息的本文設定為 MaxValue ，會在呼叫 類別的 MessageQueue 方法並使用 ActiveXMessageFormatter 時Send造成 OverflowException 。
