Question

What is the problem with the code below?

var newContextElementCollection = new List<NewContextElements>();  
var res = from eleCollection in newContextElementCollection                     
          where eleCollection.Property.Except(new List<string> { "Password", "Some Other Value" })
          select eleCollection;

The NewContextElementCollection class:

public class NewContextElements
{
    public string Property { get; set; }    
    public string Value { get; set; }
}

I am getting this error:

Instance argument: cannot convert from ‘string’ to
‘System.Linq.IQueryable’
Error 2 ‘string’ does not contain a definition for ‘Except’ and the best extension
method overload ‘System.Linq.Queryable.Except(System.Linq.IQueryable,

System.Collections.Generic.IEnumerable)’ has some invalid arguments

Answer 1

Property is a string, not an IEnumerable<string>, which is what your Except clause can work on.

var res= from eleCollection in newContextElementCollection
     where eleCollection.Property !=  "Password"
     select eleCollection;