C# Reflection Example

reflection.cs

// Get private or protected field of items
FieldInfo fieldInfo = obj.GetType().GetField("items", BindingFlags.NonPublic | BindingFlags.Instance);
object field = fieldInfo.GetValue(obj);

// Invoke simple method.
// instance.Clear();
MethodInfo methodInfo = type.GetMethod("Clear");
methodInfo.Invoke(obj, null);

// Invoke method with parameter(s).
// instance.MethodWithParams(1, 2, null);
MethodInfo methodInfo = type.GetMethod("MethodWithParams");
methodInfo.Invoke(obj, new object[] { 1, 2, null });

// Get generic type.
Type genericType = field.GetType().GetGenericArguments()[0];

// Create object from generic method.
// A a = new A();
object obj = System.Activator.CreateInstance(genericType);

// Access object's field.
FieldInfo[] fields = obj.GetType().GetFields();
foreach (FieldInfo info in fields)
{
	// info.Name
	// info.SetValue()
	// ...
}

// Invoke generic method.
// instance.GenericMethodName<T>();
MethodInfo methodInfo = type.GetMethod("GenericMethodName");
MethodInfo genericMethod = methodInfo.MakeGenericMethod(genericType);
genericMethod.Invoke(obj, null);

// Loop Collection.
IEnumerble iter = field as IEnumerable;
foreach (var item in iter)
{
	// Do something with item.
}

// Count list.
ICollection list = field as ICollection;
int count = list.Count;