System.Windows.Forms.Clipboard.SetDataObject C# (CSharp) Method

		public static void SetDataObject(object data) {
			SetDataObject(data, false);  // MSDN says default behavior is to place non-persistent data to clipboard
		}

 //添加图片到richTextBox
 private void AddPhotoButton_Click(object sender, EventArgs e)
 {                                                   //设置对话框的过滤条件
     openPhotoFileDialog.Filter = "png 文件（*.png）|*.png|jpg 文件（*.jpg）|*.jpg|bmp 文件（*.bmp）|*.bmp";
     if (openPhotoFileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
     {                                               //加载图片到richTextBox
         Clipboard.SetDataObject(Image.FromFile(openPhotoFileDialog.FileName), false);
         richTextBox1.Paste();                       //图片放在剪贴板中；false：退出程序后不将图片保留在剪贴板中
     }
     else
     {
         return;
     }
 }