IsNull Property

Summary

Checks whether this raster image is a global null instance.

Syntax

C++

public bool IsNull { get; }

Public ReadOnly Property IsNull() As Boolean 
   Get

public:  
   property bool IsNull 
   { 
      bool get() 
   }

Property Value

true if this RasterImage object is a global null instance; otherwise, false.

Remarks

In some instances, a RasterImage object that is not initialized (is null) is required, (for instance, when serializing raster images in a system that does not support a true null value). In this case, RasterImage.NullInstance can be used to represent a RasterImage that has not been initialized (but is not null). Use IsNull to test whether a RasterImage object is the null instance.

RasterImage.NullInstance is a global object and calling any other member besides IsNull will throw an exception. The one exception is calling Dispose which will be ignored.

Note that calling rasterImageObject.IsNull is the equivalent of rasterImageObject == RasterImage.NullInstance.

Requirements

Target Platforms