Retrieving Property name from lambda expression

Question

Is there a better way to get the Property name when passed in via a lambda expression? Here is what i currently have.

eg.

GetSortingInfo         


        

Answer 1

With C# 7 pattern matching:

public static string GetMemberName(this Expression expression)
{
    switch (expression.Body)
    {
        case MemberExpression m:
            return m.Member.Name;
        case UnaryExpression u when u.Operand is MemberExpression m:
            return m.Member.Name;
        default:
            throw new NotImplementedException(expression.GetType().ToString());
    }
}

Example:

public static RouteValueDictionary GetInfo(this HtmlHelper html, 
    Expression> action) where T : class
{
    var name = action.GetMemberName();
    return GetInfo(html, name);
}

[Update] C# 8 pattern matching:

public static string GetMemberName(this Expression expression) =>
    expression.Body switch
    {
        MemberExpression m =>
            m.Member.Name,
        UnaryExpression u when u.Operand is MemberExpression m =>
            m.Member.Name,
        _ =>
            throw new    NotImplementedException(expression.GetType().ToString())
    };