How can I select all the text within a Windows Forms textbox? [closed]

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Closed 6 years ago.

I want to select all the text that is with in text box.

I've tried this using the code below:

textBoxResults.SelectionStart = 0;
textBoxResults.SelectionLength = textBoxResults.Text.Length;

Source: I got this code from here http://msdn.microsoft.com/en-us/library/vstudio/hk09zy8f(v=vs.100).aspx but for some reason it doesn't seem to work.

回答1:

You can use the built in method for this purpose.

textBoxResults.SelectAll();
textBoxResults.Focus(); //you need to call this to show selection if it doesn't has focus

回答2:

You can also try the following which might solve you problem:

textBoxResults.SelectAll();

This works well with multi-lined textbox.

回答3:

This method enables you to select all text within the control.

public void CopyAllMyText()
{
// Determine if any text is selected in the TextBox control. 
if(textBox1.SelectionLength == 0)
   // Select all text in the text box.
   textBox1.SelectAll();

// Copy the contents of the control to the Clipboard.
textBox1.Copy();
}

Check this link for more info. http://msdn.microsoft.com/en-us/library/system.windows.forms.textboxbase.selectall.aspx

来源：https://stackoverflow.com/questions/18050714/how-can-i-select-all-the-text-within-a-windows-forms-textbox