using System;
using System.Collections.Generic;
using
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace testdatatime
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        enum weekday { 星期一, 星期二, 星期三, 星期四, 星期五, 星期六, 星期日 };
        private void button1_Click(object sender, EventArgs e)
        {
            datatime dt = convertdatatime(textBox1 .Text );
            weekday wd = (weekday)dt.dayofweek;
            label2.Text = "这一天是"+wd;







        }
    }
}

知道的话 改下不行