CODEWITHSUNDEEP
c#.netwinformstextbox
poy
poy

Reputation: 10557

.NET Multiline TextBox - Set number of lines

I want to be able to set the number of lines in a multilined TextBox.

I've tried the following:

int initHeight = textBox1.Height;
textBox1.Height = initHeight * numOfLines;

But this makes it too large when numOfLines gets large. So then I tried this:

float fontHeight = textBox1.CreateGraphics().MeasureString("W", textBox1.Font).Height;
textBox1.Height = fontHeight * numOfLines;

But this was too small when numOfLines was small, and too large when numOfLines was large.

So I'm doing SOMETHING wrong... any ideas?

Upvotes: 2

Views: 4329

Answers (4)

Santosh Panda
Santosh Panda

Reputation: 7351

This would set the exact Width & Height of your multi line Textbox:

 Size size = TextRenderer.MeasureText(textBox1.Text, textBox1.Font);
 textBox1.Width = size.Width;
 textBox1.Height = size.Height + Convert.ToInt32(textBox1.Font.Size);

Upvotes: 4

Reed Copsey
Reed Copsey

Reputation: 564851

From the documentation of Graphics.MeasureString:

To obtain metrics suitable for adjacent strings in layout (for example, when implementing formatted text), use the MeasureCharacterRanges method or one of the MeasureString methods that takes a StringFormat, and pass GenericTypographic. Also, ensure the TextRenderingHint for the Graphics is AntiAlias.

As such, you should use one of these overloads, such as this one, which allow you to specify StringFormat.GenericTypograpic to get the required size.

Try this:

float fontHeight;
using (var g = textBox1.CreateGraphics())
    fontHeight = g.MeasureString("W", textBox1.Font, new PointF(), StringFormat.GenericTypograpic).Height;

Upvotes: 2

Richard Seal
Richard Seal

Reputation: 4266

Something like this should work:

Size size = TextRenderer.MeasureText(textBox1.Text, textBox1.Font);
textBox1.Width = size.Width;
textBox1.Height = size.Height;

This was from C# Resize textbox to fit content

Upvotes: 3

Justin Pihony
Justin Pihony

Reputation: 67135

What you are doing should work, but you need to set the MinimumSize and MaximumSize I am not 100% positive, but I think this constraint will still hold if height is set via code

Upvotes: 2

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