C# 文件关联 (jpg等图片格式为例)

 

//使用方法：右键要打开的图片文件，打开方式-选择默认程序-浏览- pic.exe

//Form1.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.IO;

namespace pic
{
    public partial class Form1 : Form
    {
        private static string openfilepath = "";

        public Form1()
        {
            InitializeComponent();
        }

        public Form1(String[] args)
        {
            InitializeComponent();
            //打开前会显示文件的路径
            MessageBox.Show(args[0]);
            try
            {
                openfilepath = args[0];
                Image img = Image.FromFile(openfilepath);
                pictureBox1.Image = img;
            }
            catch
            {
                MessageBox.Show("打开文件出错！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }           
        }
    }
}


//Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace pic
{
    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main(String[] args)
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);          

            if (args.Length > 0)
                Application.Run(new Form1(args));
            else
                Application.Run(new Form1());
        }
    }
}