public static string GetMemberName(this LambdaExpression expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
try
{
string memberName = expression.Coalesce(
e => (e.Body as MemberExpression).ValueOrDefault(m => m.Member.Name),
e => (e.Body as UnaryExpression).ValueOrDefault(u => (u.Operand as MemberExpression).ValueOrDefault(m => m.Member.Name)));
if (memberName == null)
{
throw new InvalidOperationException("Could not determine the member name from the expression.");
}
return(memberName);
}
catch (Exception ex)
{
throw new InvalidOperationException("Could not determine the column name from the expression. In order to automatically determine the column name, the selector must be simple, for instance, \"o => o.Firstname\".", ex);
}
}