如何防止richTextBox在其中粘贴图像?

How to prevent richTextBox to paste images within it?(如何防止richTextBox在其中粘贴图像?)

问题描述

我正在用 C# 编程.我有一个 RichTextBox.

I am programming in c#. and I've a richTextBox on it.

在运行时，我通过编码将一些位图图像插入到richTextbox中.但我想阻止用户拖动我插入的图像或在 RichTextBox 中粘贴一些其他图像.

At runtime, I insert some Bitmap images into richTextbox by coding. But I want to prevent user that drag my inserted Images or paste some other images in richTextBox.

我该如何实现?

提前致谢！

推荐答案

我使用了这段代码，效果很好:

I used this code and it works perfectly:

private void richTextBox1_KeyPress(object sender, KeyPressEventArgs e)
    {
        //if ((Control.ModifierKeys & Keys.Control) == Keys.Control && (e.KeyChar == 'V' || e.KeyChar == 'v'))
        if (((int)e.KeyChar) == 22)
        {
            if(hasImage(Clipboard.GetDataObject()));
            {
                e.Handled = true;
                richTextBox1.Undo();
                MessageBox.Show("can't paste image here!!");
            }


        }
    }

    private Boolean hasImage(object obj)
    {
        System.Windows.Forms.RichTextBox richTextBox = new System.Windows.Forms.RichTextBox();
        Object data = Clipboard.GetDataObject();
        Clipboard.SetDataObject(data);
        richTextBox.Paste();
        Clipboard.SetDataObject(data);
        int offset = richTextBox.Rtf.IndexOf(@"f0fs17") + 8; // offset = 118;
        int len = richTextBox.Rtf.LastIndexOf(@"par") - offset;
        return richTextBox.Rtf.Substring(offset, len).Trim().Contains(@"{pict");
    }

并在richTextBox中禁用拖放.
谢谢

And disabled dragdrop in richTextBox.
thanks

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