form1.cs

对PDF文件添加Tag,防止别人修改pdf文件

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 HashFile
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                this.textBox1.Text = this.openFileDialog1.FileName;
            }
        }

        private const string key = "Microsoft.Finance";
        private void button2_Click(object sender, EventArgs e)
        {
            //this.textBox2.Text=MD5.md5_hash(this.textBox1.Text);
            MessageBox.Show(MD5.Check(this.textBox1.Text,key).ToString());
          // MessageBox.Show(MD5.md5_hash(this.textBox1.Text));
        }

        private void button3_Click(object sender, EventArgs e)
        {
            MessageBox.Show(MD5.MD5pdf(this.textBox1.Text,key));
        }
    }
}