c# 用代码来设置程序的PrivatePath

 有时候我们想让程序的exe文件和dll文件分开在不同目录，这时候可以有3种方法

1.在app.config中配置

2. AppDomain.CurrentDomain.AppendPrivatePath来设置

3.new AppDomainSetup().PrivateBinPath 来设置

           if (AppDomain.CurrentDomain.IsDefaultAppDomain())
            {
                string appName = AppDomain.CurrentDomain.FriendlyName;
                var currentAssembly = Assembly.GetExecutingAssembly();
                AppDomainSetup setup = new AppDomainSetup();
                setup.ApplicationBase = System.Environment.CurrentDirectory;
                setup.PrivateBinPath = "Libs";
                setup.ConfigurationFile = setup.ApplicationBase +
                                    string.Format("\\Config\\{0}.config", appName);
                AppDomain newDomain = AppDomain.CreateDomain("NewAppDomain", null, setup);
                int ret = newDomain.ExecuteAssemblyByName(currentAssembly.FullName, e.Args);
                AppDomain.Unload(newDomain);
                Environment.ExitCode = ret;
                Environment.Exit(0);
                return;
            }

可有时候又不想把他放在config文件上，只想用代码来实现，第二中方法发现已经过期，第三种方法MSDN语焉不详的，网上也没有什么资料，目前就用第四种方法

4.AppDomain有个AssemblyResolve事件，加载dll失败的时候触发，可以在这个事件里面处理

AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;

/// 

        /// 对外解析dll失败时调用
        /// 
        /// 
        /// 
        /// 
        static System.Reflection.Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
        {
            string path = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Libs\");
            path = System.IO.Path.Combine(path, args.Name.Split(',')[0]);
            path = String.Format(@"{0}.dll", path);
            return System.Reflection.Assembly.LoadFrom(path);
        }