异步操作UI界面的公用类

using System;
using System.Windows.Forms;

namespace Gren.AsyncDemo
{
    /// <summary>
    /// 异步操作状态类
    /// </summary>
    public class AsyncState
    {
        /// <summary>
        /// 异步操作异常对象
        /// </summary>
        public Exception Error { get; set; }

        /// <summary>
        /// 状态对象
        /// </summary>
        public object Data { get; set; }

    }

    /// <summary>
    /// 异步操作的工具类
    /// </summary>
    public class AsyncUtils
    {
        private AsyncState state;

        /// <summary>
        /// 异步操作状态对象
        /// </summary>
        public AsyncState State 
        {
            get { return this.state; } 
        }

        /// <summary>
        /// 控件对象
        /// </summary>
        public Control Control { get; set; }

        /// <summary>
        /// 异步操作
        /// </summary>
        public Action<AsyncState> AsyncOperation { get; set; }

        /// <summary>
        /// 异步操作的回调方法
        /// </summary>
        public Action<AsyncState> AsyncOperationCallback { get; set; }

        /// <summary>
        /// 构造函数
        /// </summary>
        public AsyncUtils()
        {
            this.state = new AsyncState();
        }

        /// <summary>
        /// 开始执行异步操作
        /// </summary>
        public void BeginInvoke()
        {
            this.state.Error = null;

            if (this.Control != null && this.AsyncOperation != null)
            {
                this.AsyncOperation.BeginInvoke(this.state, new AsyncCallback(this.InvokeCallback), null);
            }
        }

        /// <summary>
        /// 执行异步操作的回调方法
        /// </summary>
        private void InvokeCallback(IAsyncResult ar)
        {
            try
            {
                this.AsyncOperation.EndInvoke(ar);
            }
            catch (Exception ex)
            {
                this.state.Error = ex;
            }

            if (this.AsyncOperationCallback != null)
            {
                if (this.Control.InvokeRequired)
                {
                    this.Control.Invoke(this.AsyncOperationCallback, this.state);
                }
                else
                {
                    this.AsyncOperationCallback(this.state);
                }
            }
            
        }
    }
}

 

 

使用方法

 

Forms窗体中的代码，请自行添加一个button1，一个textBox1

private void button1_Click(object sender, EventArgs e)
        {
            AsyncUtils utils = new AsyncUtils();
            utils.Control = this;
            utils.State.Data = textBox1.Text;

            //此方法在新的线程中执行
            utils.AsyncOperation = new Action<AsyncState>(state => 
            {
                state.Data = "Hello " + state.Data.ToString();
                System.Threading.Thread.Sleep(3000);

                //throw new Exception("this is error");
            });

            //此方法在主线程中执行
            utils.AsyncOperationCallback = new Action<AsyncState>(state => 
            {
                if (state.Error != null)
                {
                    this.textBox1.Text = state.Error.Message;
                }
                else
                {
                    this.textBox1.Text = state.Data.ToString();
                }
                
            });

            utils.BeginInvoke();
        }