C# Substring() 方法
csharpserver side programmingprogramming更新于 2025/9/13 22:54:00
C# 中的 Substring() 方法用于从此实例中检索子字符串。子字符串从指定的字符位置开始，一直延续到字符串末尾。
语法
语法如下 -
public string Substring (int begnIndex); public string Substring (int begnIndex, int len);
以上，begnIndex 是此实例中子字符串从零开始的起始字符位置。len 参数是要检索的子字符串的编号
示例
现在让我们看一个例子 -
using System;
public class Demo {
public static void Main(String[] args) {
string str1 = "Katherine";
string str2 = "PQRS";
Console.WriteLine("String1 = "+str1);
Console.WriteLine("String1 ToUpperInvariant = "+str1.ToUpperInvariant());
Console.WriteLine("String1 Substring from index4 = " + str1.Substring(4));
Console.WriteLine("
String2 = "+str2);
Console.WriteLine("String2 ToUpperInvariant = "+str2.ToLowerInvariant());
Console.WriteLine("String2 Substring from index2 = " + str2.Substring(2));
}
}
输出
String1 = Katherine String1 ToUpperInvariant = KATHERINE String1 Substring from index4 = erine String2 = PQRS String2 ToUpperInvariant = pqrs String2 Substring from index2 = RS
示例
现在让我们看另一个例子 -
using System;
public class Demo {
public static void Main(String[] args) {
string str1 = "Notebook";
string str2 = "Ultrabook";
Console.WriteLine("String1 = "+str1);
Console.WriteLine("String1 ToUpperInvariant = "+str1.ToUpperInvariant());
Console.WriteLine("String1 Substring from index4 = " + str1.Substring(4, 4));
Console.WriteLine("
String2 = "+str2);
Console.WriteLine("String2 ToUpperInvariant = "+str2.ToLowerInvariant());
Console.WriteLine("String2 Substring from index2 = " + str2.Substring(0, 5));
}
}
输出
String1 = Notebook String1 ToUpperInvariant = NOTEBOOK String1 Substring from index4 = book String2 = Ultrabook String2 ToUpperInvariant = ultrabook String2 Substring from index2 = Ultra
