如何获取字符串的前五个字符 [英] How to get the first five character of a String

问题描述

我已阅读此问题以获取字符串的第一个字符.有没有办法从 C# 中的字符串中获取前 n 个字符?

I have read this question to get first char of the string. Is there a way to get the first n number of characters from a string in C#?

推荐答案

你可以使用 Enumerable.Take 喜欢:

char[] array = yourStringVariable.Take(5).ToArray();

或者您可以使用 String.子字符串.

string str = yourStringVariable.Substring(0,5);

请记住，如果字符串的长度小于所需的字符，String.Substring 可能会引发异常.

Remember that String.Substring could throw an exception in case of string's length less than the characters required.

如果您想以字符串形式返回结果，则可以使用:

If you want to get the result back in string then you can use:

• 使用String Constructor和LINQ的Take

string firstFivChar = new string(yourStringVariable.Take(5).ToArray());

该方法的优点是不会事先检查长度.

The plus with the approach is not checking for length before hand.

• 另一种方法是使用 String.Substring 进行错误检查

• The other way is to use String.Substring with error checking

喜欢:

string firstFivCharWithSubString = 
    !String.IsNullOrWhiteSpace(yourStringVariable) && yourStringVariable.Length >= 5
    ? yourStringVariable.Substring(0, 5)
    : yourStringVariable;

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