C# 应用程序许可控制

源代码下载：LicenseDemo.rar

首先，需要实现一个LicenseProvider

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Management;
using System.Security.Cryptography;
using System.Security.Permissions;

namespace LicenseDemo
{
    [ReflectionPermission(SecurityAction.Deny, MemberAccess=false, ReflectionEmit=false)]
    internal class MyLicenseProvider : LicenseProvider
    {
        Define MyLicense#region Define MyLicense
        private class MyLicense : License
        {
            private String mLicenseKey = null;
            private MyLicenseProvider mProvider = null;

            public MyLicense(MyLicenseProvider provider, String key)
            {
                this.mProvider = provider;
                this.mLicenseKey = key;
            }

            public override string LicenseKey
            {
                get { return this.mLicenseKey; }
            }

            public override void Dispose()
            {

                this.mProvider = null;
                this.mLicenseKey = null;
            }
        }
        #endregion

        public MyLicenseProvider()
        { }

        /**//// <summary>
        /// 获取本机MAC地址
        /// </summary>
        private String GetMacAddress()
        {
            String macAddr = null;
            ManagementClass inetAdapter = new ManagementClass("WIN32_NetworkAdapterConfiguration");
            ManagementObjectCollection objList = inetAdapter.GetInstances();
            foreach (ManagementObject mobj in objList)
            {
                if ((bool)mobj["IPEnabled"])
                {
                    macAddr = mobj["MacAddress"].ToString().Replace(":", "-");
                    break;
                }
            }
            return macAddr;
        }


        /**//// <summary>
        /// 获取Assembly所在目录
        /// </summary>
        private String GetAssemblyPath(LicenseContext context)
        {
            String fileName = null;
            Type type = this.GetType();
            ITypeResolutionService service = (ITypeResolutionService)context.GetService(typeof(ITypeResolutionService));
            if (service != null)
            {
                fileName = service.GetPathOfAssembly(type.Assembly.GetName());
            }
            if (fileName == null)
            {
                fileName = type.Module.FullyQualifiedName;
            }
            return Path.GetDirectoryName(fileName);
        }


        private String Encrypt(String source)
        {
            /**//**
             * 加密算法
             */
            //byte[] keyData = Encoding.ASCII.GetBytes("Zx2@Yt8P");
            //byte[] ivData =  Encoding.ASCII.GetBytes("4iJ9Qw#L");
            //MemoryStream stream = new MemoryStream();
            //DES desProvider = new DESCryptoServiceProvider();
            //CryptoStream cs = new CryptoStream(stream,
            //    desProvider.CreateEncryptor(keyData, ivData),
            //    CryptoStreamMode.Write);
            //byte[] buffer = Encoding.ASCII.GetBytes(source);
            //cs.Write(buffer, 0, buffer.Length);
            //cs.FlushFinalBlock();
            //cs.Close();

            //buffer = stream.GetBuffer();
            //stream.Close();
            //return Convert.ToBase64String(buffer);

            return source;
        }


        public override License GetLicense(LicenseContext context, Type type, object instance, bool allowExceptions)
        {
            MyLicense license = null;
            
            // 计算MAC地址加密串
            String macAddr = this.GetMacAddress();
            String encrypt = this.Encrypt(macAddr);

            if (context != null)
            {
                if (context.UsageMode == LicenseUsageMode.Runtime)
                {
                    String savedLicenseKey = context.GetSavedLicenseKey(type, null);
                    if (encrypt.Equals(savedLicenseKey))
                    {
                        return new MyLicense(this, encrypt);
                    }
                }
                if (license != null)
                {
                    return license;
                }
                
                // 打开License文件 'license.dat'
                String path = this.GetAssemblyPath(context);
                String licFile = Path.Combine(path, "license.dat");
                if (File.Exists(licFile))
                {
                    Stream fs = new FileStream(licFile, FileMode.Open, FileAccess.Read);
                    StreamReader sr = new StreamReader(fs);
                    String readedLicenseKey = sr.ReadToEnd();
                    sr.Close();
                    fs.Close();

                    if (encrypt.Equals(readedLicenseKey))
                    {
                        license = new MyLicense(this, encrypt);
                    }
                }

                if (license != null)
                {
                    context.SetSavedLicenseKey(type, encrypt);
                }
            }

            if (license == null)
            {
                System.Windows.Forms.MessageBox.Show("!!!尚未注册!!!");
                return new MyLicense(this, "evaluate");
            }

            return license;
        }
    }
}

然后，在需要许可控制的组件上使用该LicenseProvider：

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

namespace LicenseDemo
{
    [LicenseProvider(typeof(MyLicenseProvider))]
    public partial class Form1 : Form
    {
        private License mLicense = null;
        
        public Form1()
        {
            this.mLicense = LicenseManager.Validate(typeof(Form1), this);
            InitializeComponent();
        }

        ~Form1()
        {
            if (this.mLicense != null)
            {
                this.mLicense.Dispose();
                this.mLicense = null;
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            System.Windows.Forms.MessageBox.Show("Hello, world!");
        }
    }
}

直接运行，在Form1窗口出来之前，先会Show出一个“!!!尚未注册!!!”的对话框，这是因为还没有提供License文件的缘故。然后在程序exe文件目录创建一个license.dat文件，使用notepad编辑，直接将本机Mac地址复制进来，然后保存该文件，此时相当于用户已经提供了正确的许可文件，再运行，就不会提示尚未注册的对话框了。