CODEWITHSUNDEEP
c#lambda
Raphael
Raphael

Reputation: 8192

How to get the full name of the property from a lambda

I use the following method to create a SelectListItem object from any other object:

public static SelectListItem ToSelectListItem<T, TResult, TResult2>(T obj, Expression<Func<T, TResult>> value, Expression<Func<T, TResult2>> text)
{
    string strValue = String.Empty;
    string strText = String.Empty;

    if (value != null)
          strValue = (value.Body as MemberExpression).Member.Name;

    if (text != null)
          strText = (text.Body as MemberExpression).Member.Name;
         ...
 }

I use this method like this:

SelectListItem item = ToSelectListItem(obj, x => x.ID, x => x.Name);

And it works fine. However, when I specify a property from an associated object all I get is the name of the property

SelectListItem item = ToSelectListItem(obj, x => x.ID, x => x.Profile.Name);

The property name I'm able to get from 'x => x.Profile.Name' is only 'Name' and what I really wanted to get was 'Profile.Name'.

Any suggestions would be appreciated.

Upvotes: 3

Views: 1024

Answers (2)

ThiagoAlves
ThiagoAlves

Reputation: 888

Or you can use 

expression.Compile().Invoke(obj)

if you want to use Expression<>

Upvotes: 2

Raphael
Raphael

Reputation: 8192

It's much easier to use Func instead of Expression<>

To manipulate the property all I have to do is invoke it:

expression.Invoke(obj);

Upvotes: 1

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