什么是子串的含义 [英] whats the meaning of substring

问题描述

在c＃中，我正在创建一个计算器。现在，我刚刚在这里阅读了一个论坛，并获得了退格按钮的代码。现在，它为我工作。



我想知道什么是

In c# , i am creating a calculator. Now, i just read one of the forum here and got this code for "backspace" button. Now, its working for me.

I want to know whats the meaning of

textBox1.Text.Substring(0, i - 1)

int i = textBox1.Text.Length;
           textBox1.Text = textBox1.Text.Substring(0, i - 1);

推荐答案

SubString返回字符串的一部分，由



指定起始字符位置 - >字符串的结尾

SubString returns a part of the string, by either

specified starting character position --> the end of the string

string a = "Hello World";
string b = a.SubString(6);
Console.WriteLine(b);

output:
World

指定起始字符位置 - >指定的长度

specified starting character position --> a specified lenght

string a = "Hello World";
string b = a.SubString(0,5)
Console.WriteLine(b);

output:
Hello

http://msdn.microsoft.com/en-us/library/aka44szs(v=vs.110).aspx [ ^ ]

在使用基本的.NET对象（在这种情况下，使用String对象）时，你应该习惯去看看MSDN：

String.Substring方法 [ ^ ]



它将解释你应该知道的有关Substring（）方法及其重载的所有内容。

You should take the habit to go and see MSDN when it comes to using basic .NET objects (in that case, the String object):
String.Substring Method[^]

It will explain everything you should know about the Substring() method and its overloads.

substring是一个字符串的方法，它只返回范围之间的值

substring is a method of a string it returns only the value between the range

string input = "OneTwoThree";

   
    string sub = input.Substring(0, 3);
    Console.WriteLine("Substring: {0}", sub);

结果：

一个

Result:
one

string input = "OneTwoThree";

   
    string sub = input.Substring(4, 3);
    Console.WriteLine("Substring: {0}", sub);

结果：

两个

Result:
Two

substring('yourstring',startIndex,endIndex)

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