将MemoryStream对象转换为Outlook.MailItem

Question

我正在创建Outlook add-in，我正在创建拖放区域 我想收到拖拽到我控制权的邮件。我使用了以下代码：

    private void DragDropControl_DragDrop(object sender, DragEventArgs e)
    {
        //wrap standard IDataObject in OutlookDataObject
        OutlookDataObject dataObject = new OutlookDataObject(e.Data);

        //get the names and data streams of the files dropped
        string[] filenames = (string[])dataObject.GetData("FileGroupDescriptorW");
        //get the Mail Item here.
        MemoryStream[] filestreams = (MemoryStream[])dataObject.GetData("FileContents");

        this.label2.Text += "Files:\n";
        for (int fileIndex = 0; fileIndex < filenames.Length; fileIndex++)
        {
            //use the fileindex to get the name and data stream
            string filename = filenames[fileIndex];
            MemoryStream filestream = filestreams[fileIndex];
            this.label2.Text += "    " + filename + "\n";

            //save the file stream using its name to the application path
            FileStream outputStream = File.Create(filename);
            filestream.WriteTo(outputStream);

            byte[] bytesInStream = new byte[outputStream.Length];

            //I don't want to save file to the local drive or something like this.
            var fileStream = File.Create("C:\\TestFileSave\\" + filename + ".msg");

            outputStream.Seek(0, SeekOrigin.Begin);
            outputStream.CopyTo(fileStream);

            fileStream.Close();

            outputStream.Close();

            readMessage(filename);
        }
    }

在readMessage(filename)函数中，我获取了已保存的文件并阅读MailItem。

但是当我在没有管理员权限的情况下运行outlook时出现了实际问题，它给出了如下错误：

有没有其他方法可以将文件保存到本地驱动器，将其转换为Outlook.MailItem？

任何帮助将不胜感激。