Remove all duplicates from a given string in C#
programmingserver side programmingcsharp更新于 2025/9/1 6:37:17
Here is the string.
string str = "ppqqrr";
Now, use Hashset to map the string to char. This will remove the duplicate characters from a string.
var res = new HashSet<char>(str);
Let us see the complete example −
示例
using System;
using System.Linq;
using System.Collections.Generic;
namespace Demo {
class Program {
static void Main(string[] args) {
string str = "ppqqrr";
Console.WriteLine("Initial String: "+str);
var res = new HashSet<char>(str);
Console.Write("New String after removing duplicates:");
foreach (char c in res){
Console.Write(c);
}
}
}
}
输出
Initial String: ppqqrr New String after removing duplicates:pqr
