C#Substring()方法
Substring()C#中的方法用于从此实例检索子字符串。子字符串从指定的字符位置开始，一直到字符串的末尾。
语法
语法如下-
public string Substring (int begnIndex); public string Substring (int begnIndex, int len);
上面的示例中，begnIndex是子字符串的从零开始的字符位置。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("\nString2 = "+str2);
Console.WriteLine("String2 ToUpperInvariant = "+str2.ToLowerInvariant());
Console.WriteLine("String2 Substring from index2 = " + str2.Substring(2));
}
}输出结果
String1 = Katherine String1 ToUpperInvariant = KATHERINE String1 Substring from index4 = erine String2 = PQRS String2 ToUpperInvariant = pqrs String2 Substring from index2 = RS
示例
现在让我们来看另一个例子-
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("\nString2 = "+str2);
Console.WriteLine("String2 ToUpperInvariant = "+str2.ToLowerInvariant());
Console.WriteLine("String2 Substring from index2 = " + str2.Substring(0, 5));
}
}输出结果
String1 = Notebook String1 ToUpperInvariant = NOTEBOOK String1 Substring from index4 = book String2 = Ultrabook String2 ToUpperInvariant = ultrabook String2 Substring from index2 = Ultra