public static void SetValue (INativeDependencyObjectWrapper wrapper, DependencyProperty dp, object value) { Type object_type; if (dp == null) throw new ArgumentNullException ("property"); CheckNativeAndThread (wrapper); if (dp.DeclaringType != null && !dp.IsAttached) { if (!dp.DeclaringType.IsAssignableFrom (wrapper.GetType ())) throw new System.ArgumentException (string.Format ("The DependencyProperty '{2}', registered on type {0} can't be used to set a value on an object of type {1}", dp.DeclaringType.AssemblyQualifiedName, wrapper.GetType ().AssemblyQualifiedName, dp.Name)); } if (value == null) { using (var val = new Value { k = NativeMethods.dependency_property_get_property_type(dp.Native), IsNull = true }) { var v = val; NativeMethods.dependency_object_set_value (wrapper.NativeHandle, dp.Native, ref v); } return; } if (value == DependencyProperty.UnsetValue) { // Setting to UnsetValue appears to be equivalent to ClearValue ClearValue (wrapper, dp); return; } // XXX we need this to work with all // INativeDependencyObjectWrapper, I expect.. // but right now the only one other than DO is // Application, which doesn't have any // settable properties, so we're safe for now. if (wrapper is DependencyObject) dp.Validate ((DependencyObject)wrapper, dp, value); object_type = value.GetType (); bool type_valid = false; if (dp.PropertyType.IsGenericTypeDefinition) { Type t = object_type; while (t != null) { if (dp.PropertyType.IsAssignableFrom (t)) { type_valid = true; break; } if (t.IsGenericType && !t.IsGenericTypeDefinition) t = t.GetGenericTypeDefinition (); else t = t.BaseType; } } else { type_valid = dp.PropertyType.IsAssignableFrom (object_type); } if (!type_valid) { throw new ArgumentException (string.Format ("The DependencyProperty '{3}.{2}', whose property type is {0} can't be set to value whose type is {1}", dp.PropertyType.FullName, object_type.FullName, dp.Name, dp.DeclaringType.FullName)); } using (var val = Value.FromObject (value, dp is CustomDependencyProperty)) { var v = val; NativeMethods.dependency_object_set_value (wrapper.NativeHandle, dp.Native, ref v); } }