Extension method to get property name

Question

I have an extension method to get property name as

public static string Name(this Expression> expression)
{
    MemberExpression         


        

Answer 1

With C# 6.0, you can use:

nameof(PublishDateTime)

Answer 2

Try this:

public static string Name<T,TProp>(this T o, Expression<Func<T,TProp>> propertySelector)
{
    MemberExpression body = (MemberExpression)propertySelector.Body;
    return body.Member.Name;
}

The usage is:

this.Name(x=>x.PublishDateTime);

Answer 3

You can't do this.PublishDateTime.Name(), as the only thing that will be passed into the extension method is the value or reference on which you call the extension method.

Whether it's a property, field, local variable or method result doesn't matter, it won't have a name that you can access inside the extension method.

The expression will be "verbose", see How can I add this method as an extension method to properties of my class? (thanks @Black0ut) to put it in a static helper class.