异常："The operation cannot be performed because the message has been changed."

Question

我有代码：

public void ExportEmail(Microsoft.Office.Core.IRibbonControl control)
{
   MailItem mailItem = this.extractor.ExtractMailItem(control);
   mailItem.MessageClass = "Bla bla";
   mailItem.Save();//Exception after second call
   //edit code////
   System.Runtime.InteropServices.Marshal.ReleaseComObject(mailItem);
   mailItem = null;
   ///////////////
   this.eventAggregator.GetEvent<ExportEmailEvent>().Publish(mailItem);
}

当我第一次按下按钮时，这段代码工作正常。但是第二次我得到异常：

System.Runtime.InteropServices.COMException{"The operation cannot be performed because the message has been changed."}

异常发生在 mailItem.Save();.

Answer 1

首先，我建议立即释放底层 COM 对象。使用 System.Runtime.InteropServices.Marshal.ReleaseComObject to release an Outlook object when you have finished using it. Then set a variable to Nothing in Visual Basic (null in C#) to release the reference to the object. You can read more about that in the Systematically Releasing Objects 篇文章。

消息 class 在您第一次通话后是否发生了变化？您是否尝试调试代码？有什么不同吗？是否是新消息（尚未保存）？

异常："The operation cannot be performed because the message has been changed."

Exception : "The operation cannot be performed because the message has been changed."

c#

outlook-addin