C# String.IndexOf( ) 方法
csharpserver side programmingprogramming更新于 2025/9/13 4:37:00
C# 中的 String.IndexOf() 方法用于查找此实例中指定 Unicode 字符或字符串首次出现的从零开始的索引。
语法
语法如下 −
public int IndexOf (string val);
上面，val 是要查找的字符串。
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 = "Jacob";
string str2 = "John";
Console.WriteLine("String 1 = "+str1);
Console.WriteLine("HashCode of String 1 = "+str1.GetHashCode());
Console.WriteLine("Index of character 'o' is str1 = " + str1.IndexOf("o"));
Console.WriteLine("
String 2 = "+str2);
Console.WriteLine("HashCode of String 2 = "+str2.GetHashCode());
Console.WriteLine("Index of character 'o' is str2 =" + str2.IndexOf("o"));
bool res = str1.Contains(str2);
if (res)
Console.WriteLine("Found!");
else
Console.WriteLine("Not found!");
}
}
输出
这将产生以下输出 −
String 1 = Jacob HashCode of String 1 = -790718923 Index of character 'o' is str1 = 3 String 2 = John HashCode of String 2 = -1505962600 Index of character 'o' is str2 =1 Not found!
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 = "Kevin";
string str2 = "Evin";
Console.WriteLine("String 1 = "+str1);
Console.WriteLine("HashCode of String 1 = "+str1.GetHashCode());
Console.WriteLine("Index of character 'k' in str1 = " + str1.IndexOf("k"));
Console.WriteLine("
String 2 = "+str2);
Console.WriteLine("HashCode of String 2 = "+str2.GetHashCode());
Console.WriteLine("Index of character 'k' in str2 =" + str2.IndexOf("k"));
bool res = str1.Contains(str2);
if (res)
Console.WriteLine("Found!");
else
Console.WriteLine("Not found!");
}
}
输出
这将产生以下输出 −
String 1 = Kevin HashCode of String 1 = -768104063 Index of character 'k' in str1 = -1 String 2 = Evin HashCode of String 2 = 1223510568 Index of character 'k' in str2 =-1 Not found!
