winform 使用task不卡界面的2种方式

方法1：

            button1.Enabled = false;
            TaskScheduler uiContext = TaskScheduler.FromCurrentSynchronizationContext();
            Task t = Task.Factory.StartNew(async () =>
             {
                 for (int i = 0; i < 5; i++)
                 {
                     Console.WriteLine("任务1: " + DateTime.Now.ToString("ss.fff"));
                     await Task.Delay(1000);
                 }
                 return 1;
             }).ContinueWith(m =>
             {
                 button1.Enabled = true;
                 Console.WriteLine("任务1：结束");
             }, uiContext);

方法2：

            button2.Enabled = false;
            TaskScheduler ui = TaskScheduler.FromCurrentSynchronizationContext();
            Task t = Task.Factory.StartNew(async () =>
            {
                for (int i = 0; i < 5; i++)
                {
                    Console.WriteLine("任务2: " + DateTime.Now.ToString("ss.fff"));
                    await Task.Delay(1000);
                }
                return 1;
            }).ContinueWith(m =>
            {
                this.Invoke(new MethodInvoker(() =>
                {
                    button2.Enabled = true;
                    Console.WriteLine("任务2：结束");
                }));
            });

using System;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
        }

        private void button1_Click(object sender, EventArgs e)
        {
            button1.Enabled = false;
            TaskScheduler ui = TaskScheduler.FromCurrentSynchronizationContext();
            Task t = Task.Factory.StartNew(() =>
             {
                 for (int i = 0; i < 5; i++)
                 {
                     Console.WriteLine("任务1: " + DateTime.Now.ToString("ss.fff"));
                     Task.Delay(1000).Wait();
                 }
                 return 1;
             }).ContinueWith(m =>
             {
                 button1.Enabled = true;
                 Console.WriteLine("任务1：结束");
             }, ui);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            button2.Enabled = false;
            TaskScheduler ui = TaskScheduler.FromCurrentSynchronizationContext();
            Task t = Task.Factory.StartNew(() =>
            {
                for (int i = 0; i < 5; i++)
                {
                    Console.WriteLine("任务2: " + DateTime.Now.ToString("ss.fff"));
                    Task.Delay(1000).Wait();
                }
                return 1;
            }).ContinueWith(m =>
            {
                ButtonEnabled();
            });
        }

        private void ButtonEnabled()
        {
            this.Invoke(new MethodInvoker(() =>
            {
                button2.Enabled = true;
                Console.WriteLine("任务2：结束");
            }));
        }

        private int i = 0;
        private void btnOperate_Click(object sender, EventArgs e)
        {
            lblMsg.Text = i++.ToString();
        }
    }
}

namespace WindowsFormsApp1
{
    partial class Form1
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows 窗体设计器生成的代码

        /// <summary>
        /// 设计器支持所需的方法 - 不要修改
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.button1 = new System.Windows.Forms.Button();
            this.btnOperate = new System.Windows.Forms.Button();
            this.button2 = new System.Windows.Forms.Button();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.lblMsg = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(161, 51);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 0;
            this.button1.Text = "开始";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // btnOperate
            // 
            this.btnOperate.Location = new System.Drawing.Point(312, 62);
            this.btnOperate.Name = "btnOperate";
            this.btnOperate.Size = new System.Drawing.Size(150, 99);
            this.btnOperate.TabIndex = 0;
            this.btnOperate.Text = "点开始后，再点我不阻塞";
            this.btnOperate.UseVisualStyleBackColor = true;
            this.btnOperate.Click += new System.EventHandler(this.btnOperate_Click);
            // 
            // button2
            // 
            this.button2.Location = new System.Drawing.Point(161, 127);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(75, 23);
            this.button2.TabIndex = 0;
            this.button2.Text = "开始";
            this.button2.UseVisualStyleBackColor = true;
            this.button2.Click += new System.EventHandler(this.button2_Click);
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(91, 62);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(47, 12);
            this.label1.TabIndex = 1;
            this.label1.Text = "方法1：";
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(91, 132);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(47, 12);
            this.label2.TabIndex = 1;
            this.label2.Text = "方法2：";
            // 
            // lblMsg
            // 
            this.lblMsg.AutoSize = true;
            this.lblMsg.BackColor = System.Drawing.Color.Transparent;
            this.lblMsg.Font = new System.Drawing.Font("宋体", 16F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.lblMsg.ForeColor = System.Drawing.Color.Tomato;
            this.lblMsg.Location = new System.Drawing.Point(352, 26);
            this.lblMsg.Name = "lblMsg";
            this.lblMsg.Size = new System.Drawing.Size(65, 22);
            this.lblMsg.TabIndex = 1;
            this.lblMsg.Text = "-----";
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(510, 254);
            this.Controls.Add(this.lblMsg);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.btnOperate);
            this.Controls.Add(this.button1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.Button btnOperate;
        private System.Windows.Forms.Button button2;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.Label lblMsg;
    }
}