TextRange.IsEmpty Property

Gets a value indicating whether or not the current selection is empty.

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

public bool IsEmpty { get; }
You cannot set this property in XAML.

Property Value

Type: System.Boolean
true if the current selection is empty; otherwise, false.

A TextRange is considered empty if the Start and End positions are equal.

The following example demonstrates the use of the IsEmpty property.

// This method accepts an input stream and a corresponding data format.  The method 
// will attempt to load the input stream into a TextRange selection, apply Bold formatting 
// to the selection, save the reformatted selection to an alternat stream, and return  
// the reformatted stream.  
Stream BoldFormatStream(Stream inputStream, string dataFormat)
{
    // A text container to read the stream into.
    FlowDocument workDoc = new FlowDocument();
    TextRange selection = new TextRange(workDoc.ContentStart, workDoc.ContentEnd);
    Stream outputStream = new MemoryStream();

    try
    {
        // Check for a valid data format, and then attempt to load the input stream 
        // into the current selection.  Note that CanLoad ONLY checks whether dataFormat 
        // is a currently supported data format for loading a TextRange.  It does not  
        // verify that the stream actually contains the specified format.  An exception  
        // may be raised when there is a mismatch between the specified data format and  
        // the data in the stream.  
        if (selection.CanLoad(dataFormat))
            selection.Load(inputStream, dataFormat);
    }
    catch (Exception e) { return outputStream; /* Load failure; return a null stream. */ }

    // Apply Bold formatting to the selection, if it is not empty. 
    if (!selection.IsEmpty)
        selection.ApplyPropertyValue(TextElement.FontWeightProperty, FontWeights.Bold);

    // Save the formatted selection to a stream, and return the stream. 
    if (selection.CanSave(dataFormat))
        selection.Save(outputStream, dataFormat);

    return outputStream;
}

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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