using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;



namespace MahApps.Metro.netcoreapp30

{

    public delegate void DoHandler();



    public class Timeout

    {

        private ManualResetEvent mTimeoutObject;

        //标记变量  

        private bool mBoTimeout;



        public DoHandler Do;



        public Timeout()

        {

            //  初始状态为 停止  

            this.mTimeoutObject = new ManualResetEvent(true);

        }

        ///<summary>  

                /// 指定超时时间 异步执行某个方法  

                ///</summary>  

                ///<returns>执行 是否超时</returns>  

        public bool DoWithTimeout(TimeSpan timeSpan)

        {

            if (this.Do == null)

            {

                return false;

            }

            this.mTimeoutObject.Reset();

            this.mBoTimeout = true; //标记  

            this.Do.BeginInvoke(DoAsyncCallBack, null);

            // 等待 信号Set  

            if (!this.mTimeoutObject.WaitOne(timeSpan, false))

            {

                this.mBoTimeout = true;

            }

            return this.mBoTimeout;

        }

        ///<summary>  

                /// 异步委托 回调函数  

                ///</summary>  

                ///<param name="result"></param>  

        private void DoAsyncCallBack(IAsyncResult result)

        {

            try

            {

                this.Do.EndInvoke(result);

                // 指示方法的执行未超时  

                this.mBoTimeout = false;

            }

            catch (Exception ex)

            {

                Console.WriteLine(ex.Message);

                this.mBoTimeout = true;

            }

            finally

            {

                this.mTimeoutObject.Set();

            }

        }

    }

}

 this.Do.BeginInvoke(DoAsyncCallBack, null);
这行。net core 3.0报错，Operation is not supported on this platform 。之前wpf能正常用的。迁移不了了。。。
net core 不能委托吗?