в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

Admin: 1 версия

2010-05-26T12:18:05Z

1 версия

Новая страница

==DefaultIfEmpty Demo ==

<source lang="csharp">using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
public static void Main() {
string[] presidents = {"G", "H", "a", "H", "over", "Jack"};
string name =
presidents.Where(n => n.Equals("H")).DefaultIfEmpty("Missing").First(); Console.WriteLine(name);
}
}</source>

==Using DefaultIfEmpty in Where clause==

<source lang="csharp">using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
public static void Main() {
string[] presidents = {"G", "H", "a", "H", "over", "Jack"};
string jones = presidents.Where(n => n.Equals("H")).DefaultIfEmpty().First();
if (jones != null)
Console.WriteLine("H was found.");
else
Console.WriteLine("H was not found.");
}
}</source>

==Without Using DefaultIfEmpty==

<source lang="csharp">using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
public static void Main() {
string[] presidents = {"G", "H", "a", "H", "over", "Jack"};
string jones = presidents.Where(n => n.Equals("H")).First();
if (jones != null)
Console.WriteLine("H was found");
else
Console.WriteLine("H was not found");
}
}</source>

← Предыдущая	Версия 15:31, 26 мая 2010
(нет различий)

Csharp/CSharp Tutorial/LINQ/DefaultIfEmpty - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия