如何隐藏Visio复制到RichTexbox的过程

using Microsoft.Office.Interop.Visio;
using System.Runtime.InteropServices;

private void HideVisioCopyToRichTextBox()
{
    // 创建Visio应用程序对象
    Application visioApp = new Application();

    // 打开Visio文档
    Document visioDoc = visioApp.Documents.Open("path_to_visio_file.vsdx");

    // 将Visio图形复制到剪贴板
    visioDoc.Pages[1].Activate();
    visioApp.ActiveWindow.SelectAll();
    visioApp.ActiveWindow.Selection.Copy();

    // 从剪贴板中获取图形数据
    IDataObject dataObject = Clipboard.GetDataObject();
    if (dataObject != null && dataObject.GetDataPresent(DataFormats.MetafilePict))
    {
        // 将图形数据转换为Metafile对象
        Metafile metafile = (Metafile)dataObject.GetData(DataFormats.MetafilePict);

        // 将Metafile对象插入到RichTextBox中
        richTextBox1.SelectionStart = richTextBox1.TextLength;
        richTextBox1.SelectionLength = 0;
        richTextBox1.SelectedRtf = @"{\rtf1\ansi\deff0{\pict\wmetafile8" + metafile.GetMetafileHeader().Wmf + "}}";
    }

    // 关闭Visio文档并退出Visio应用程序
    visioDoc.Close();
    visioApp.Quit();

    // 释放Visio对象
    Marshal.ReleaseComObject(visioDoc);
    Marshal.ReleaseComObject(visioApp);
}

HideVisioCopyToRichTextBox();