List<int> 转 string []
List<int> 转 string []
http://blog.sina.com.cn/s/blog_54b14bb80100xvl1.html
希望可以转换成字符串：“1,2,3,4,5,6,7”
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using test2;
namespace test
{
class Program
{
static void Main(string[] args)
{
List<int> agreementIds = new List<int>() { 1, 2, 3, 4, 5, 6, 7 };
//Solution1
foreach (int i in agreementIds)
Console.WriteLine(i);
//Solution2
Console.WriteLine(String.Join(",",agreementIds.ConvertAll((i)=>i.ToString()).ToArray()));
//Solution3
Console.WriteLine(String.Join(",", agreementIds.ConvertToString(1)));
////Solution4
Func<List<int>, string[]> ToArray = p1 => p1.ConvertToString(1);
Func<List<int>, string[]> ToArray1 = p1 => p1.ConvertAll((i) => i.ToString()).ToArray();
Func<List<int>, string[]> ToArray2 = delegate(List<int> x) { return x.ConvertAll((i) => i.ToString()).ToArray(); };
Console.WriteLine(string.Join(",", ToArray(agreementIds)));
Console.WriteLine(string.Join(",", ToArray1(agreementIds)));
Console.WriteLine(string.Join(",", ToArray2(agreementIds)));
Console.ReadLine();
}
}
}
//Solution3
namespace test2
{
public static class MyExtensions
{
public static string[] ConvertToString(this List<int> s,int a)
{
return s.ConvertAll((i) => i.ToString()).ToArray();
}
}
}
运行结果如下 ：
