TextBox.LineCount Property

Gets the total number of lines in the text box.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)

public int LineCount { get; }
You cannot set this property in XAML.

Property Value

Type: System.Int32
The total number of lines in the text box, or –1 if layout information is not available.

If text wrapping is enabled, changing the width of the text box may change this value.

The value returned is the total number of lines in the text box, regardless of how many are currently visible.

This example shows how to get a collection of lines of text from a TextBox.

The following example shows a simple method that takes a TextBox as the argument, and returns a StringCollection containing the lines of text in the TextBox. The LineCount property is used to determine how many lines are currently in the TextBox, and the GetLineText method is then used to extract each line and add it to the collection of lines.

StringCollection GetLinesCollectionFromTextBox(TextBox textBox)
{
    StringCollection lines = new StringCollection();

    // lineCount may be -1 if TextBox layout info is not up-to-date. 
    int lineCount = textBox.LineCount;

    for (int line = 0; line < lineCount; line++)
        // GetLineText takes a zero-based line index.
        lines.Add(textBox.GetLineText(line));

    return lines;
}

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0
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