System.AppDomain.Unload C# (CSharp) Method

        public static void Unload(AppDomain domain)
        {
            if (domain == null)
            {
                throw new ArgumentNullException(nameof(domain));
            }
            throw new CannotUnloadAppDomainException(SR.NotSupported);
        }

 /// <summary>
 /// 执行与释放或重置托管资源相关的应用程序定义的任务。
 /// </summary>
 protected override void DisposeManaged()
 {
     this._Instance = null;
     AppDomain.Unload(this._domain);
     this._domain = null;
 }