C# 线程更新UI界面

首先创建ProgressBar进度条控件，一个Button按钮，和一个label控件

注意， 进度条控件的Name为：pgbWrite，按钮的Name为：button1，label的Name为：lblWriteStatus

button按钮的点击事件

        private void button1_Click(object sender, EventArgs e)
        {
            int taskCount = 10000; //任务量为10000
            this.pgbWrite.Maximum = taskCount;
            this.pgbWrite.Value = 0;

            DataWrite dataWrite = new DataWrite(); //实例化一个写入数据的类
            dataWrite.UpdateUIDelegate += UpdataUIStatus; //绑定更新任务状态的委托
            dataWrite.TaskCallBack += Accomplish; //绑定完成任务要调用的委托

            Thread thread = new Thread(new ParameterizedThreadStart(dataWrite.Write)); //启动线程，执行方法
            thread.IsBackground = true; //后台进程
            thread.Start(taskCount); //传入参数，并启动
        }

声明一个更新ui界面的方法

        private void UpdataUIStatus(int step)
        {
            if (InvokeRequired)
            {
                this.Invoke(new AsynUpdateUI(delegate(int s)
                {
                    this.pgbWrite.Value += s;
                    this.lblWriteStatus.Text = this.pgbWrite.Value.ToString() + "/" + this.pgbWrite.Maximum.ToString();
                }), step);
            }
            else
            {
                this.pgbWrite.Value += step;
                this.lblWriteStatus.Text = this.pgbWrite.Value.ToString() + "/" + this.pgbWrite.Maximum.ToString();
            }
        }

声明一个写入数据的类

 private class DataWrite
        {
            public delegate void UpdateUI(int step); //声明一个更新主线程的委托
            public UpdateUI UpdateUIDelegate;

            public delegate void AccomplishTask(); //声明一个在完成任务时通知主线程的委托
            public AccomplishTask TaskCallBack;

            /// <summary>
            /// 示例方法
            /// </summary>
            /// <param name="lineCount"></param>
            public void Write(object lineCount)
            {
                StreamWriter writeIO = new StreamWriter("city.txt", false, Encoding.GetEncoding("utf-8"));
                //写入头
                string head = "编号,省,市";
                writeIO.Write(head);
                for (int i = 0; i < (int)lineCount; i++)
                {
                    writeIO.WriteLine(i.ToString() + ",北京,海淀");
                    //写入一条数据，调用更新主线程ui状态的委托
                    UpdateUIDelegate(1);
                }
                //任务完成时通知主线程作出相应的处理
                TaskCallBack();
                writeIO.Close();
            }
        }

当线程任务执行完之后调用的方法

        /// <summary>
        /// 完成任务时需要调用
        /// </summary>
        private void Accomplish()
        {
            //还可以进行其他的一些完任务完成之后的逻辑处理
            MessageBox.Show("任务完成");
        }

以下是整体代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Threading;
namespace UI
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        delegate void AsynUpdateUI(int step);
        private void button1_Click(object sender, EventArgs e)
        {
            int taskCount = 10000; //任务量为10000
            this.pgbWrite.Maximum = taskCount;
            this.pgbWrite.Value = 0;

            DataWrite dataWrite = new DataWrite(); //实例化一个写入数据的类
            dataWrite.UpdateUIDelegate += UpdataUIStatus; //绑定更新任务状态的委托
            dataWrite.TaskCallBack += Accomplish; //绑定完成任务要调用的委托

            Thread thread = new Thread(new ParameterizedThreadStart(dataWrite.Write)); //启动线程，执行方法
            thread.IsBackground = true; //后台进程
            thread.Start(taskCount); //传入参数，并启动
        }

        private void UpdataUIStatus(int step)
        {
            if (InvokeRequired)
            {
                this.Invoke(new AsynUpdateUI(delegate(int s)
                {
                    this.pgbWrite.Value += s;
                    this.lblWriteStatus.Text = this.pgbWrite.Value.ToString() + "/" + this.pgbWrite.Maximum.ToString();
                }), step);
            }
            else
            {
                this.pgbWrite.Value += step;
                this.lblWriteStatus.Text = this.pgbWrite.Value.ToString() + "/" + this.pgbWrite.Maximum.ToString();
            }
        }

        /// <summary>
        /// 完成任务时需要调用
        /// </summary>
        private void Accomplish()
        {
            //还可以进行其他的一些完任务完成之后的逻辑处理
            MessageBox.Show("任务完成");
        }
 

        private class DataWrite
        {
            public delegate void UpdateUI(int step); //声明一个更新主线程的委托
            public UpdateUI UpdateUIDelegate;

            public delegate void AccomplishTask(); //声明一个在完成任务时通知主线程的委托
            public AccomplishTask TaskCallBack;

            /// <summary>
            /// 示例方法
            /// </summary>
            /// <param name="lineCount"></param>
            public void Write(object lineCount)
            {
                StreamWriter writeIO = new StreamWriter("city.txt", false, Encoding.GetEncoding("utf-8"));
                //写入头
                string head = "编号,省,市";
                writeIO.Write(head);
                for (int i = 0; i < (int)lineCount; i++)
                {
                    writeIO.WriteLine(i.ToString() + ",北京,海淀");
                    //写入一条数据，调用更新主线程ui状态的委托
                    UpdateUIDelegate(1);
                }
                //任务完成时通知主线程作出相应的处理
                TaskCallBack();
                writeIO.Close();
            }
        }
    }
}