Extension method to convert lambda property getter expression to a property setter delegate

LambdaExtensions.cs

public static class ExpressionExtensions
{
	/// <summary>
	/// Converts a lambda property getter expression to a property setter delegate.
	/// For example: "o => o.MyProperty" to "o => o.MyProperty = newValue"
	/// </summary>
	public static Action<TProperty> ConvertGetterToSetter<TObject, TProperty>(this Expression<Func<TObject, TProperty>> expression, TObject o) {
		var property = ((MemberExpression)expression.Body).Member as PropertyInfo;

		Guard.Against(property == null, "Expression is not a property getter");

		var param = Expression.Parameter(typeof(TProperty), property.Name);
		var call = Expression.Call(Expression.Constant(o), property.GetSetMethod(), new[] { (Expression)param });
		var viewSetter = Expression.Lambda<Action<TProperty>>(call, param).Compile();

		return viewSetter;
	}
}

[TestClass]
public class When_using_extensions
{
	public class TestClass { public string TestProperty { get; set; } }

	[TestMethod]
	public void it_should_convert_a_getter_expression_to_a_setter_delegate() {
		TestClass test = new TestClass();

		Expression<Func<TestClass, string>> getter = o => o.TestProperty;
		Action<string> setter = getter.ConvertGetterToSetter(test);

		setter("Test");

		Assert.AreEqual("Test", test.TestProperty);
	}
}