public void GetComponentType()
{
var component = new DescriptorTestComponent();
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.Property), false);
Assert.Equal(component.GetType(), propertyDescriptor.ComponentType);
}
public void GetComponentType()
{
var component = new DescriptorTestComponent();
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.Property), false);
Assert.Equal(component.GetType(), propertyDescriptor.ComponentType);
}
public void CopyConstructorAddsAttribute()
{
var component = new DescriptorTestComponent();
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor oldPropertyDescriptor = properties.Find(nameof(component.Property), false);
var newAttribute = new DescriptorTestAttribute();
PropertyDescriptor newPropertyDescriptor = TypeDescriptor.CreateProperty(component.GetType(), oldPropertyDescriptor, newAttribute);
Assert.True(newPropertyDescriptor.Attributes.Contains(newAttribute));
}
public void CopyConstructorAddsAttribute()
{
var component = new DescriptorTestComponent();
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor oldPropertyDescriptor = properties.Find(nameof(component.Property), false);
var newAttribute = new DescriptorTestAttribute();
PropertyDescriptor newPropertyDescriptor = TypeDescriptor.CreateProperty(component.GetType(), oldPropertyDescriptor, newAttribute);
Assert.True(newPropertyDescriptor.Attributes.Contains(newAttribute));
}
public void GetValueDoesNotHandleExceptions()
{
var component = new DescriptorTestComponent();
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.PropertyWhichThrows), false);
Assert.Throws <TargetInvocationException>(() => propertyDescriptor.GetValue(component));
}
public void ResetValueReturnsFalseWhenValueEqualsDefault()
{
var component = new DescriptorTestComponent();
component.Property = DescriptorTestComponent.DefaultPropertyValue;
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.Property), false);
Assert.False(propertyDescriptor.CanResetValue(component));
}
public void ShouldSerializeValueReturnsTrueWhenValueIsNotDefault()
{
var component = new DescriptorTestComponent();
component.Property = DescriptorTestComponent.DefaultPropertyValue - 1;
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.Property), false);
Assert.True(propertyDescriptor.ShouldSerializeValue(component));
}
public void ResetValueReturnsFalseWhenValueEqualsDefault()
{
var component = new DescriptorTestComponent();
component.Property = DescriptorTestComponent.DefaultPropertyValue;
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.Property), false);
Assert.False(propertyDescriptor.CanResetValue(component));
}
public void ShouldSerializeValueHandlesEnumWithBackingTypeDefaultValue()
{
var component = new DescriptorTestComponent();
component.EnumProperty = DescriptorTestEnum.Value1;
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.EnumProperty), false);
Assert.True(propertyDescriptor.ShouldSerializeValue(component));
}
public void AddAttribute()
{
var component = new DescriptorTestComponent();
var addedAttribute = new DescriptorTestAttribute("expected string");
TypeDescriptor.AddAttributes(component.GetType(), addedAttribute);
AttributeCollection attributes = TypeDescriptor.GetAttributes(component);
Assert.True(attributes.Contains(addedAttribute));
}
public void GetValue()
{
var component = new DescriptorTestComponent();
component.Property = 37;
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.Property), false);
var retrievedValue = propertyDescriptor.GetValue(component);
Assert.Equal(component.Property, retrievedValue);
}
public void AddAttribute()
{
var component = new DescriptorTestComponent();
var addedAttribute = new DescriptorTestAttribute("expected string");
TypeDescriptor.AddAttributes(component.GetType(), addedAttribute);
AttributeCollection attributes = TypeDescriptor.GetAttributes(component);
Assert.True(attributes.Contains(addedAttribute));
}
public void RemoveAddedEventHandler()
{
var component = new DescriptorTestComponent();
Action eventHandler = () => Assert.True(false, "EventDescriptor failed to remove an event handler");
EventDescriptor eventDescriptor = TypeDescriptor.CreateEvent(component.GetType(), nameof(component.ActionEvent), typeof(Action));
eventDescriptor.AddEventHandler(component, eventHandler);
eventDescriptor.RemoveEventHandler(component, eventHandler);
// component.Event should now have no handler => raising it should throw a NullReferenceException
Assert.Throws <NullReferenceException>(() => component.RaiseEvent());
}
public void RemoveAddedEventHandler()
{
var component = new DescriptorTestComponent();
Action eventHandler = () => Assert.True(false, "EventDescriptor failed to remove an event handler");
EventDescriptor eventDescriptor = TypeDescriptor.CreateEvent(component.GetType(), nameof(component.ActionEvent), typeof(Action));
eventDescriptor.AddEventHandler(component, eventHandler);
eventDescriptor.RemoveEventHandler(component, eventHandler);
// component.Event should now have no handler => raising it should throw a NullReferenceException
Assert.Throws(typeof(NullReferenceException), () => component.RaiseEvent());
}
public void ResetValue()
{
var component = new DescriptorTestComponent();
component.Property = DescriptorTestComponent.DefaultPropertyValue - 1;
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.Property), false);
// this should set the property's value to that provided by the DefaultValueAttribute
propertyDescriptor.ResetValue(component);
Assert.Equal(DescriptorTestComponent.DefaultPropertyValue, component.Property);
}
public void RaiseAddedEventHandler()
{
var component = new DescriptorTestComponent();
var eventHandlerWasCalled = false;
Action eventHandler = () => eventHandlerWasCalled = true;
var eventInfo = typeof(DescriptorTestComponent).GetEvent(nameof(DescriptorTestComponent.ActionEvent));
EventDescriptor eventDescriptor = TypeDescriptor.CreateEvent(component.GetType(), nameof(component.ActionEvent), typeof(Action));
eventDescriptor.AddEventHandler(component, eventHandler);
component.RaiseEvent();
Assert.True(eventHandlerWasCalled);
}
public void RaiseAddedEventHandler()
{
var component = new DescriptorTestComponent();
var eventHandlerWasCalled = false;
Action eventHandler = () => eventHandlerWasCalled = true;
var eventInfo = typeof(DescriptorTestComponent).GetTypeInfo().GetEvent(nameof(DescriptorTestComponent.ActionEvent));
EventDescriptor eventDescriptor = TypeDescriptor.CreateEvent(component.GetType(), nameof(component.ActionEvent), typeof(Action));
eventDescriptor.AddEventHandler(component, eventHandler);
component.RaiseEvent();
Assert.True(eventHandlerWasCalled);
}
public void RaiseAddedValueChangedHandler()
{
var component = new DescriptorTestComponent();
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.Property), false);
var handlerWasCalled = false;
EventHandler valueChangedHandler = (_, __) => handlerWasCalled = true;
propertyDescriptor.AddValueChanged(component, valueChangedHandler);
propertyDescriptor.SetValue(component, int.MaxValue);
Assert.True(handlerWasCalled);
}
public void RaiseAddedValueChangedHandler()
{
var component = new DescriptorTestComponent();
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.Property), false);
var handlerWasCalled = false;
EventHandler valueChangedHandler = (_, __) => handlerWasCalled = true;
propertyDescriptor.AddValueChanged(component, valueChangedHandler);
propertyDescriptor.SetValue(component, int.MaxValue);
Assert.True(handlerWasCalled);
}
public void GetValueDoesNotHandleExceptions()
{
var component = new DescriptorTestComponent();
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.PropertyWhichThrows), false);
Assert.ThrowsAny<Exception>(() => propertyDescriptor.GetValue(component));
}
public void ResetValue()
{
var component = new DescriptorTestComponent();
component.Property = DescriptorTestComponent.DefaultPropertyValue - 1;
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.Property), false);
// this should set the property's value to that provided by the DefaultValueAttribute
propertyDescriptor.ResetValue(component);
Assert.Equal(DescriptorTestComponent.DefaultPropertyValue, component.Property);
}
public void GetValue()
{
var component = new DescriptorTestComponent();
component.Property = 37;
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.Property), false);
var retrievedValue = propertyDescriptor.GetValue(component);
Assert.Equal(component.Property, retrievedValue);
}
public void ShouldSerializeValueReturnsTrueWhenValueIsNotDefault()
{
var component = new DescriptorTestComponent();
component.Property = DescriptorTestComponent.DefaultPropertyValue - 1;
var properties = TypeDescriptor.GetProperties(component.GetType());
PropertyDescriptor propertyDescriptor = properties.Find(nameof(component.Property), false);
Assert.True(propertyDescriptor.ShouldSerializeValue(component));
}
