Use delegate to create a filter : Filter « LINQ « C# / CSharp Tutorial

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C# / CSharp Tutorial » LINQ » Filter 
22.41.1.Use delegate to create a filter
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Reflection;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
class Person {
    int _id;
    int _idRole;
    string _lastName;
    string _firstName;

    public int ID {
        get return _id; }
        set _id = value; }
    }

    public int IDRole {
        get return _idRole; }
        set _idRole = value; }
    }

    public string LastName {
        get return _lastName; }
        set _lastName = value; }
    }

    public string FirstName {
        get return _firstName; }
        set _firstName = value; }
    }
}
class Program {
    static void Main(string[] args) {
        List<Person> people = new List<Person> {
               new Person ID = 1, IDRole = 1, LastName = "A", FirstName = "B"},
               new Person ID = 2, IDRole = 2, LastName = "G", FirstName = "T"}
            };

        Func<Person, bool> filter = delegate(Person p) { return p.ID == 1};
        var query = people
                    .Where(filter)
                    .Select(p => new p.FirstName, p.LastName });
    }
}
22.41.Filter
22.41.1.Use delegate to create a filter
22.41.2.Calling the Common Library Filter Method
22.41.3.Calling the Filter Method with an Anonymous Method
22.41.4.Calling the Filter Method with a Lambda Expression
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