How to check for nulls in a deep lambda expression? [duplicate]

by

You could do this with a generic helper extension method, something like:

public static class Get {
    public static T IfNotNull<T, U>(this U item, Func<U, T> lambda) where U: class {
        if (item == null) {
            return default(T);
        }
        return lambda(item);
    }
}

var one = new One();
string fooIfNotNull = one.IfNotNull(x => x.Two).IfNotNull(x => x.Three).IfNotNull(x => x.Four).IfNotNull(x => x.Foo);

More Related Contents:

  1. System.Linq.Expression.Compile error
  2. Get All instead of FirstOrDefault
  3. Retrieving Property name from lambda expression
  4. Combining two expressions (Expression)
  5. Join/Where with LINQ and Lambda
  6. How to perform Join between multiple tables in LINQ lambda
  7. How can I get every nth item from a List?
  8. Sorting a list using Lambda/Linq to objects
  9. How do I invoke an extension method using reflection?
  10. Mutating the expression tree of a predicate to target another type
  11. Can I specify my explicit type comparator inline?
  12. Multiple Order By with LINQ [duplicate]
  13. How to convert an expression tree to a partial SQL query?
  14. lambda expressions in immediate window for VS2015
  15. Is it Linq or Lambda?
  16. C# Pass Lambda Expression as Method Parameter
  17. Cannot use a lambda expression as an argument to a dynamically dispatched operation without first casting it to a delegate or expression tree type
  18. Cannot convert lambda expression to type ‘string’ because it is not a delegate type [duplicate]
  19. LINQ – Query syntax vs method chains & lambda [closed]
  20. Local variable and expression trees
  21. How to merge a list of lists with same type of items to a single list of items?
  22. String.IsNullOrWhiteSpace in LINQ Expression
  23. convert this LINQ expression into Lambda
  24. Access the value of a member expression
  25. List complex sorting
  26. Max return value if empty query
  27. How do I dynamically create an Expression predicate?
  28. Linq – Top value from each group
  29. Linq query or Lambda expression?
  30. Convert DataTable to Generic List in C#

Leave a Comment