C# String 前面不足位数补零的方法

using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApp1
{
	class Program
	{
		static void Main(string[] args)
		{
			//var a = 5;
			var a = 24;

			// 整数前面补N个0以保存对齐
			Console.WriteLine("{0:D4}", a);
			Console.WriteLine(a.ToString("D4"));
			Console.WriteLine(a.ToString().PadLeft(4, '0'));
			//Console.WriteLine(a.ToString().PadRight(4, '0'));
			Console.WriteLine(a.ToString("0000"));
		}
	}
}

运行结果：

0024
0024
0024
0024
请按任意键继续. . .