I used this SO Question to retrieve a property of an object using reflection. The property I retrieved is another object that has a property called Value
that I need to access. All of the potential objects that I retrieve using reflection derive from the same class EntityField
and therefore all have a Value
property. I saw this SO question that hinted at how I might be able to access the Value
property, but I couldn't quite put together the correct code. How can I access the Value
property on an object retrieved by reflection?
var parent = entity.GetType().GetProperty("Property");
parent.GetType().GetProperty("Value").SetValue(parent, newValue); // parent.GetType() is null
(parent as EntityField<T>).Value = newValue; // Not sure how to dynamically set T since it could be any system type
private static void SetValues(JObject obj, EntityBase entity)
{
// entity.GetType().GetProperty("Property") returns an EntityField Object
// I need to set EntityField.Value = obj["Value"]
// Current code sets EntityField = obj["Value"] which throws an error
entity.GetType().GetProperty("Property").SetValue(entity, obj["Value"], null);
}
public class EntityField<T> : EntityFieldBase
{
private Field _Field;
private T _Value;
public EntityField(Field field, T value){
this._Field = field;
this._Value = value;
}
public Field Field
{
get
{
return this._Field;
}
set
{
if (this._Field != value)
{
this._Field = value;
}
}
}
public T Value
{
get
{
return this._Value;
}
set
{
if (!EqualityComparer<T>.Default.Equals(this._Value, value))
{
this._Value = value;
this._IsDirty = true;
}
}
}
}
Try this:
entity.GetType().GetProperty("Value").SetValue(entity, obj["Value"], null);
You need to specify the name of the property in the GetProperty() method. I suspect there was no such property called 'Property' :)
Edit: After reading your comments try
entity.Property.GetType().GetProperty("Value").SetValue(entity, obj["Value"], null);
Tried the following in LinqPad and it worked...
class TestChild<T>
{
public T ChildProperty { get; set; }
}
class TestParent<T>
{
public TestChild<T> ParentProperty { get; set; }
}
void Main()
{
var instance = new TestParent<string>
{
ParentProperty = new TestChild<string>()
};
instance.GetType()
.GetProperty("ParentProperty")
.GetValue(instance)
.GetType()
.GetProperty("ChildProperty")
.SetValue(instance.ParentProperty, "Value");
Console.WriteLine(instance.ParentProperty.ChildProperty);
}
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