linq查询

1、定义一个数组string[] str= {"abcd","apple","@symjie","banana","orange"};

①查询出str中以@符号开头的

using System;
using System.Linq;
public class Linq
{
    public static void Main()
    {
        string[] str= {"abcd","apple","@symjie","banana","orange"};
        //查询出str中以@符号开头的
        
        var result = from p in str
                     where p.StartsWith("@")
                     select p;
        foreach(string s in result)
        {
            Console.WriteLine(s);
        }
    
            }
}

 

②查询出Str中元素长度大于5的元素

using System;
using System.Linq;
public class Linq
{
    public static void Main()
    {
        string[] str= {"abcd","apple","@symjie","banana","orange"};

    
        //查询出Str中元素长度大于5的元素
        var result1 = from p in str
                      where p.Length>5
                      select p;
        foreach(string ss in result1)
        {
            Console.WriteLine(ss);
        }
        

    }
}