本文整理匯總了C#中System.Linq.Queryable.Single方法的典型用法代碼示例。如果您正苦於以下問題：C# Queryable.Single方法的具體用法？C# Queryable.Single怎麽用？C# Queryable.Single使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。
在下文中一共展示了Queryable.Single方法的3個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的C#代碼示例。
示例1:
// Create two arrays.
string[] fruits1 = { "orange" };
string[] fruits2 = { "orange", "apple" };
// Get the only item in the first array.
string fruit1 = fruits1.AsQueryable().Single();
Console.WriteLine("First query: " + fruit1);
try
{
// Try to get the only item in the second array.
string fruit2 = fruits2.AsQueryable().Single();
Console.WriteLine("Second query: " + fruit2);
}
catch (System.InvalidOperationException)
{
Console.WriteLine(
"Second query: The collection does not contain exactly one element."
);
}輸出：
First query: orange
Second query: The collection does not contain exactly one element
示例2:
string[] fruits = { "apple", "banana", "mango",
"orange", "passionfruit", "grape" };
// Get the only string in the array whose length is greater than 10.
string fruit1 = fruits.AsQueryable().Single(fruit => fruit.Length > 10);
Console.WriteLine("First Query: " + fruit1);
try
{
// Try to get the only string in the array
// whose length is greater than 15.
string fruit2 = fruits.AsQueryable().Single(fruit => fruit.Length > 15);
Console.WriteLine("Second Query: " + fruit2);
}
catch (System.InvalidOperationException)
{
Console.Write("Second Query: The collection does not contain ");
Console.WriteLine("exactly one element whose length is greater than 15.");
}輸出：
First Query: passionfruit
Second Query: The collection does not contain exactly one
element whose length is greater than 15.
示例3: Main
//引入命名空間
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
public class MainClass{
public static void Main(){
int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9};
var query = numbers.Single(n => n > 8);
Console.Write(query);
}
}