C# Resize textbox to fit content

Question

I'm writing a program where the user should be able to write text in a TextBox. I'd like the TextBox to resize itself, so it fits to the content. I've tried the following:

private void textBoxTitle_TextChanged(object sender, TextChangedEventArgs e) {     System.Drawing.Font myFont = new System.Drawing.Font("Verdana", 8);     System.Drawing.SizeF mySize = e.Graphics.MeasureString("This is a test", myFont);     this.textBoxTitle.Width = (int)Math.Round(mySize.Width, 0); } 

I get an error saying that Graphics doesn't work for TextChangedEventArgs. Is there another way I can resize the TextBox?

Answer 1

You should try a code something like below. It has worked for me well.

private void textBox1_TextChanged(object sender, EventArgs e) {   Size size = TextRenderer.MeasureText(textBox1.Text, textBox1.Font);   textBox1.Width = size.Width;   textBox1.Height = size.Height; } 

For more information refer to TextRenderer.MeasureText()

Answer 2

I am adding this answer as I do not see the fixed width aspect of a textbox being discussed in any of the other. If you have a fixed width for your textbox, and you want to adjust only its height you can do something like the following:

Something like this gives the height of the text as how it is drawn in the multiline wordwrapped textbox itself:

SizeF MessageSize = MyTextBoxControl.CreateGraphics()                                 .MeasureString(MyTextBoxControl.Text,                                                 MyTextBoxControl.Font,                                                 MyTextBoxControl.Width,                                                  new StringFormat(0)); 

I am not sure what StringFormat should be but the values StringFormatFlags do not seem to apply to a default TextBox make up.

Now with MessageSize.Height you know the height of the text in the textbox.