您如何访问收藏夹中的任何一项 [英] how can u access any one of item from collections

问题描述

实际上，我不得不使用foreach循环来访问集合中的每个项目，但我想

可以访问集合中的任何一项，即，只能访问
中的一项
collection.不想访问其余项目.

foreach循环就像

actually i had to use foreach loop for accessing each item from collection but i want

to access the any one of item from collection i.e access only one item from

collection.don''t want to access the remaining items.

foreach loop like as

foreach(string item in collection)
{


}

我要访问集合中的任何一项，即，仅访问
中的一项
collection.不想访问其余项目.

请帮帮我.

谢谢.

i want to access the any one of item from collection i.e access only one item from

collection.don''t want to access the remaining items.

please help me.

thank u.

推荐答案

如果您的集合实现了索引器，则可以直接访问项目.
使用索引器(C#编程指南) [第64部分-C#教程-.net中索引器的使用方式和位置 [ ^ ].

If your collection implements an indexer, you can directly access an item.
Using Indexers (C# Programming Guide)[^] provides some details about this.

Here is a video that shows indexer examples - Part 64 - C# Tutorial - How and where are indexers used in .net [^].

// get the first item if there is one
string x = collection.FirstOrDefault();

// or get the first one that confirms to a condition, such as it
// starts with "A"
string y = collection.FirstOrDefault(s => s.StartsWith("A"));

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