в 15:31, 26 мая 2010

2010-05-26T15:31:18Z

Admin: 1 версия

2010-05-26T11:38:45Z

1 версия

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==Call ILookUp returned from ToLookup to get the IEnumerable==

<source lang="csharp">
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class Employee {
public string birthYear;
public string firstName;
public string lastName;
public static Employee[] GetEmployees() {
Employee[] actors = new Employee[] {
new Employee { birthYear = "1964", firstName = "K", lastName = "R" },
new Employee { birthYear = "1968", firstName = "O", lastName = "W" },
new Employee { birthYear = "1960", firstName = "J", lastName = "S" },
new Employee { birthYear = "1965", firstName = "S",lastName = "B" },
};
return (actors);
}
}
public class MyStringifiedNumberComparer : IEqualityComparer<string> {
public bool Equals(string x, string y) {
return (Int32.Parse(x) == Int32.Parse(y));
}
public int GetHashCode(string obj) {
return Int32.Parse(obj).ToString().GetHashCode();
}
}
public class MainClass {
public static void Main() {
ILookup<string, string> lookup = Employee.GetEmployees()
.ToLookup(k => k.birthYear,a => string.Format("{0} {1}", a.firstName, a.lastName),new MyStringifiedNumberComparer());
IEnumerable<string> actors = lookup["1965"];
foreach (var actor in actors)
Console.WriteLine("{0}", actor);
}
}
</source>

==ToLookup Demo==

<source lang="csharp">
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class Employee {
public string birthYear;
public string firstName;
public string lastName;
public static Employee[] GetActors() {
Employee[] actors = new Employee[] {
new Employee { birthYear = "1964", firstName = "K", lastName = "R" },
new Employee { birthYear = "1968", firstName = "O", lastName = "W" },
new Employee { birthYear = "1960", firstName = "J", lastName = "S" },
new Employee { birthYear = "1964", firstName = "S",lastName = "B" },
};
return (actors);
}
}
public class MyStringifiedNumberComparer : IEqualityComparer<string> {
public bool Equals(string x, string y) {
return (Int32.Parse(x) == Int32.Parse(y));
}
public int GetHashCode(string obj) {
return Int32.Parse(obj).ToString().GetHashCode();
}
}
public class MainClass {
public static void Main() {
ILookup<string, Employee> lookup = Employee.GetActors()
.ToLookup(k => k.birthYear, new MyStringifiedNumberComparer());
IEnumerable<Employee> actors = lookup["1968"];
foreach (var actor in actors)
Console.WriteLine("{0} {1}", actor.firstName, actor.lastName);
}
}
</source>

==ToLookup with int and string==

<source lang="csharp">
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class Employee {
public int birthYear;
public string firstName;
public string lastName;
public static Employee[] GetEmployees() {
Employee[] actors = new Employee[] {
new Employee { birthYear = 1964, firstName = "K", lastName = "R" },
new Employee { birthYear = 1968, firstName = "O", lastName = "W" },
new Employee { birthYear = 1960, firstName = "J", lastName = "S" },
new Employee { birthYear = 1964, firstName = "S", lastName = "B" },
};
return (actors);
}
}
public class MainClass {
public static void Main() {
ILookup<int, string> lookup = Employee.GetEmployees()
.ToLookup(k => k.birthYear,
a => string.Format("{0} {1}", a.firstName, a.lastName));
IEnumerable<string> actors = lookup[1964];
foreach (var actor in actors)
Console.WriteLine("{0}", actor);
}
}
</source>

==Use ToLookup to search object property==

<source lang="csharp">
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class Employee {
public int birthYear;
public string firstName;
public string lastName;
public static Employee[] GetEmployees() {
Employee[] actors = new Employee[] {
new Employee { birthYear = 1964, firstName = "K", lastName = "R" },
new Employee { birthYear = 1968, firstName = "O", lastName = "W" },
new Employee { birthYear = 1960, firstName = "J", lastName = "S" },
new Employee { birthYear = 1964, firstName = "S", lastName = "B" },
};
return (actors);
}
}
public class MainClass {
public static void Main() {
ILookup<int, Employee> lookup = Employee.GetEmployees().ToLookup(k => k.birthYear);
IEnumerable<Employee> actors = lookup[1964];
foreach (var actor in actors)
Console.WriteLine("{0} {1}", actor.firstName, actor.lastName);
}
}
</source>

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Csharp/C Sharp/LINQ/ToLookup - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия