Linq lambda arguments

Question

I have many linq queries, only difference is values.

string x = "foo1";
string y = "foo2"
foo.Where(m => m.Descendants(x).Any(v => v.Value.Contains(y)))

How can I use x and y like a variable, maybe I need extract linq in another method and how it I can do?

• Jon Skeet: Well what are x and y meant to be? Your question is unclear at the moment... a full concrete example would be really useful.
• user2167382: @Vlad, x and y are values from some array?
• Vlad: @user2167382 they are strings
• Lasse V. Karlsen: Assuming that .Descendants(string) is a method on m returning a collection, containing somethat that has a Value property/field that returns something on which .Contains(y) will work, I fail to see what the problem is here. Does the code as posted work? If so, what is the question?
• Vlad: @LasseV.Karlsen I have many linqs, so I want use method to nake my code cleaner.

Answer 1

Are you looking for something like this

public static IEnumerable<XElement> GetElements(this XElement foo, string x, string y)
{ 
 return foo.Where(m => m.Descendants(x).Any(v => v.Value.Contains(y)))
}

Answer 2

You could simply copy the method signature. Put your cursor on Descendants and hit F12.

Answer 3

Personally I need a good reason to use XPath or Linq to do element parsing instead of deserializing XML to hard type class elements. Like Selman22 you can write extension method

public static class Extensions
{
 public static IEnumerable<XElement> GetElements(
 this XElement foo, string x, string y)
 { 
 return foo.Where(m => m.Descendants(x).Any(v => v.Value.IndexOf(y)>-1))
 }
}

After that you can use :

var item = foo.GetElements(x,y);

Answer 4

I found a good solve for my problem with lambda expressions, thanks @Selman22 for idea.

Func<IEnumerable<XElement>, string, string, IEnumerable<XElement>> functionSearch;
functionSearch = (l, x, y) => l.Where(m => m.Descendants(x).Any(v => v.Value.Contains(y)));