How to determine the number of lines in a textbox

[Anonymous]

Some body know how to count the no of lines in a textbox in VB.Net?

A "line" is defined as each new line after a word-wrap, in other words, each line showing against the left margin. It does not mean, and is independent of, the actual number of lines delimited by hard returns in the text.

[Clay Burch]

With a TextBox, other than trying to implement a wordwrap algorithm yourself, and count the wraps in the process, I don't know of a way to get this value.

If you use a RichTextBox, you can probably use its GetPositionFromCharIndex to compute the number of wrapped lines. Worst scenario is you could do a loop from 1 to Length of the string and just count the number of times the Y index changed. More efficient might be to get the difference between the Y of the last character and the Y of the first character and then divide by the row height.

this.label1.Text = this.richTextBox1.GetPositionFromCharIndex(
this.richTextBox1.Text.Length).ToString();
this.label1.Refresh();

[Anonymous]

Thanks Clay

[Anonymous]

Thanks Clay

[Anonymous]

Thanks Clay

[Administrator]

> With a TextBox, other than trying to implement a wordwrap algorithm yourself, and count the wraps in the process, I don't know of a way to get this value.

Could you use Graphics.MeasureString()?