在 C# 中清除 RichTextBox 中的文本

Question

I have a RichTextBox, and I am wanting to code it, that when the user left clicks in the box, that the text in that text box, clears out.

Please can someone help me out?

My code I have tried is:

private void richTextBox1_TextChanged(object sender, EventArgs e)
{
    richTextBox1.text = "";
}

At the moment I have the box with "Input Text Here" written in it (under the Text in the Properties Section) - so when the user clicks inside the box, it will clear that text,so the user can type text in there.

Thank you.

Answer 1

Try this

private void richTextBox1_Click(object sender, EventArgs e)
{
  if (richTextBox1.Text == "Input Text Here")
  {
    richTextBox1.Clear();
    richTextBox1.Focus();
  }
}

It checks wether default text is there or not, if it is it clears it and gives the richbox focus so you can enter text. Otherwise, it procedes with the regular textchanging.

Answer 2

Subscribe to MouseClick of rtb, then do:

    private void richTextBox1_MouseClick(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            richTextBox1.Clear();
        }
    }

Answer 3

What you're looking for is a Cue Textbox. You can do this with one WINAPI call.

See this as a reference: http://www.codeproject.com/Articles/18858/Fully-themed-Windows-Vista-Controls

Answer 4

I am VS2015 user.

richTextBox1.Clear();                 // Form
richTextBox1.Document.Blocks.Clear(); // WPF

Answer 5

This will work:

Go to the "properties" of your richtextbox. You will see a yellow lightning bolt in the first line tab. There you will find all possible events that can be triggered. Search for "Enter" or "Click" entry, double-click it. There you can put whatever you want (such as richTextBox1.Text = "";)