[英]Send binary message in MSMQ
在.NET服務中,我想通過MSMQ消息發送流的內容。 我從WCF接收到一個Stream對象(可以是圖像,.doc文件或其他任何東西),我只想將內容放入MSMQ中。 我嘗試將System.Messaging.Message.BodyStream屬性設置為流對象,但是在嘗試發送消息時收到“方法不支持”錯誤。
有沒有人提供有關該操作的示例或教程?
我正在尋找這樣的東西:
留言合同:
<MessageContract()> _
Class UploadStreamMessage
<MessageHeader()> _
Public guidCaller As Guid
<MessageBodyMember()> _
Public data As Stream
End Class
然后執行WriteToMSMQ方法:
<OperationBehavior(TransactionScopeRequired:=True, Impersonation:=ImpersonationOption.Required)> _
Public Sub WriteToMSMQ (ByVal stream As IServiceMSMQ.UploadStreamMessage) Implements IServiceMSMQ.WriteToMSMQ
Using queue As New MessageQueue(NOM_QUEUE)
Dim msmqMessage As New Message
msmqMessage = New System.Messaging.Message()
msmqMessage.Body = stream.data
queue.Send(msmqMessage, transaction)
stream.data.Close()
End Using
謝謝 !
這是我使用的電子郵件隊列的示例...我認為您需要添加一個格式化程序。
這是DTO:
[Serializable]
public class EmailOut
{
private readonly string _fromEmail;
private readonly string _toEmail;
private readonly string _subject;
private readonly string _body;
private readonly string _cc;
private readonly IList<EmailOutAttachment> _emailOutAttachments;
public EmailOut(string fromEmail, string toEmail, string subject, string body, string cc, IList<EmailOutAttachment> emailOutAttachments)
{
_fromEmail = fromEmail;
_cc = cc;
_emailOutAttachments = emailOutAttachments;
_toEmail = toEmail;
_subject = subject;
_body = body;
}
public string FromEmail
{
get { return _fromEmail; }
}
public string ToEmail
{
get { return _toEmail; }
}
public string Subject
{
get { return _subject; }
}
public string Body
{
get { return _body; }
}
public string Cc
{
get { return _cc; }
}
public IList<EmailOutAttachment> EmailOutAttachments
{
get { return _emailOutAttachments; }
}
public override string ToString()
{
return string.Format("FromEmail: {0}, ToEmail: {1}, Subject: {2}, Body: {3}, Cc: {4}", _fromEmail, _toEmail, _subject, _body, _cc);
}
}
[Serializable]
public class EmailOutAttachment
{
private readonly string _name;
private readonly byte[] _bytes;
private readonly int _size;
//Null ok for emailer
private readonly string _mimeEncodingType;
/// <summary>
/// Null ok for mime type.
/// </summary>
/// <param name="name"></param>
/// <param name="bytes"></param>
/// <param name="size"></param>
/// <param name="mimeEncodingType">Null ok for mime type.</param>
public EmailOutAttachment( string name, byte[] bytes, int size, string mimeEncodingType)
{
_bytes = bytes;
_name = name;
_size = size;
_mimeEncodingType = mimeEncodingType;
}
public byte[] Bytes
{
get { return _bytes; }
}
public int Size
{
get { return _size; }
}
public string MimeEncodingType
{
get { return _mimeEncodingType; }
}
public string Name
{
get { return _name; }
}
}
這是您需要的擴展。
public static Byte[] GetBytes(this Stream input)
{
if (null == input || 0 == input.Length)
return new Byte[0];
byte[] bytes = new byte[input.Length];
int numBytesToRead = (int)input.Length;
int numBytesRead = 0;
while (numBytesToRead > 0)
{
// Read may return anything from 0 to numBytesToRead.
int n = input.Read(bytes, numBytesRead, numBytesToRead);
// Break when the end of the file is reached.
if (n == 0)
break;
numBytesRead += n;
numBytesToRead -= n;
}
return bytes;
}
這是發送機制:
using (Message msg = new Message())
{
msg.Body = new EmailOut(from, to, title, body, cc, attachments);
msg.Recoverable = true;
msg.Formatter = new BinaryMessageFormatter();
string queuePath = config.MsmqEmailBox;
//if this queue doesn't exist we will create it
//if (!MessageQueue.Exists(queuePath))
// MessageQueue.Create(queuePath);
using (MessageQueue messageQueue = new MessageQueue(queuePath))
{
messageQueue.Formatter = new BinaryMessageFormatter();
messageQueue.Send(msg);
}
}
這是它的接收端...
using (var messageQueue = new MessageQueue(_config.MsmqEmailBox))
try
{
_log.Debug("Retrieving queue");
messageQueue.Formatter = new BinaryMessageFormatter();
messageQueue.MessageReadPropertyFilter.SetAll();
List<Message> allMessages = messageQueue.GetAllMessages().ToList();
if(0 < allMessages.Count)
SendEmailNoMsmq.Instance.SendDotNetEmail(_config.DevRecipient,string.Format("Sending queued messages, Count: {0}, Time: {1}",allMessages.Count,DateTime.Now),"MSMQ MAIL SEND", _config, _log);
foreach (Message message in allMessages)
{
EmailOut msg = (EmailOut)message.Body;
_log.Info(string.Format("Sending email id:{0} to:{1} ", message.Id, msg.ToEmail));
SendEmailNoMsmq.Instance.SendDotNetEmail(msg, _config, _log);
messageQueue.ReceiveById(message.Id);
}
}
catch (Exception ex)
{
_log.Error("Error ex:" + ex);
throw;
}
}
MSMQ不支持流傳輸,因為它顯式基於消息且松散耦合。 您應該將合同字段聲明為byte[]
並在那里收集數據。
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