|
public GetTypeDescriptor ( |
||
| objectType | ||
| Результат | ICustomTypeDescriptor | |
/// <summary>Gets a custom type descriptor for the given type and object.</summary>
/// <returns>An <see cref="T:System.ComponentModel.ICustomTypeDescriptor" /> that can provide metadata for the type.</returns>
/// <param name="objectType">The type of object for which to retrieve the type descriptor.</param>
/// <param name="instance">An instance of the type. Can be null if no instance was passed to the <see cref="T:System.ComponentModel.TypeDescriptor" />.</param>
public virtual ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance)
{
if (_parent != null)
{
return(_parent.GetTypeDescriptor(objectType, instance));
}
if (_emptyCustomTypeDescriptor == null)
{
_emptyCustomTypeDescriptor = new EmptyCustomTypeDescriptor();
}
return(_emptyCustomTypeDescriptor);
}
public void GetTypeDescriptorShouldReturnExpectedValue()
{
// arrange
Func<ICustomTypeDescriptor, ICustomTypeDescriptor> factory = parent =>
{
var descriptor = new CustomTypeDescriptor<string>( parent );
descriptor.AddExtensionProperty( "Name", s => s.GetType().Name );
return descriptor;
};
var target = new TypeDescriptionProvider<string>( factory );
// act
var actual = target.GetTypeDescriptor( typeof( string ), "" );
// assert
Assert.NotNull( actual );
Assert.IsType( typeof( CustomTypeDescriptor<string> ), actual );
}
