/// <summary>
/// Gets the reader behavior for null property value on the specified property.
/// </summary>
/// <param name="model">The model containing the annotation.</param>
/// <param name="property">The property to check.</param>
/// <returns>The behavior to use when reading null value for this property.</returns>
public static ODataNullValueBehaviorKind NullValueReadBehaviorKind(this IEdmModel model, IEdmProperty property)
{
ExceptionUtils.CheckArgumentNotNull(model, "model");
ExceptionUtils.CheckArgumentNotNull(property, "property");
ODataEdmPropertyAnnotation annotation = model.GetAnnotationValue <ODataEdmPropertyAnnotation>(property);
return(annotation == null ? ODataNullValueBehaviorKind.Default : annotation.NullValueReadBehaviorKind);
}
/// <summary>
/// Adds a transient annotation to indicate how null values for the specified property should be read.
/// </summary>
/// <param name="model">The <see cref="IEdmModel"/> containing the annotations.</param>
/// <param name="property">The <see cref="IEdmProperty"/> to modify.</param>
/// <param name="nullValueReadBehaviorKind">The new behavior for reading null values for this property.</param>
public static void SetNullValueReaderBehavior(this IEdmModel model, IEdmProperty property, ODataNullValueBehaviorKind nullValueReadBehaviorKind)
{
ExceptionUtils.CheckArgumentNotNull(model, "model");
ExceptionUtils.CheckArgumentNotNull(property, "property");
ODataEdmPropertyAnnotation annotation = model.GetAnnotationValue <ODataEdmPropertyAnnotation>(property);
if (annotation == null)
{
if (nullValueReadBehaviorKind != ODataNullValueBehaviorKind.Default)
{
annotation = new ODataEdmPropertyAnnotation
{
NullValueReadBehaviorKind = nullValueReadBehaviorKind
};
model.SetAnnotationValue(property, annotation);
}
}
else
{
annotation.NullValueReadBehaviorKind = nullValueReadBehaviorKind;
}
}
