如果在WinForm中执行一个长时间操作时，窗体就会被锁死，直到操作完成，对于操作者的体验就是死锁状态，那在.NET（.net 5以后）中，怎么实现一个并发，等待，且同步操作信息窗口呢？

第一步：首先定义一个等待窗体，为了有明确的提示，做一个等待的gif图，同步有提示信息。

using System.Windows.Forms;namespace AliWorkbench.Load
{partial class LoadingFrm{/// <summary>/// Required designer variable./// </summary>private System.ComponentModel.IContainer components = null;/// <summary>/// Clean up any resources being used./// </summary>/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>protected override void Dispose(bool disposing){if (disposing && (components != null)){components.Dispose();}base.Dispose(disposing);}#region Windows Form Designer generated code/// <summary>/// Required method for Designer support - do not modify/// the contents of this method with the code editor./// </summary>private void InitializeComponent(){System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(LoadingFrm));this.pictureBox1 = new System.Windows.Forms.PictureBox();this.labMessage = new System.Windows.Forms.Label();((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();this.SuspendLayout();// // pictureBox1// this.pictureBox1.Image = ((System.Drawing.Image)(resources.GetObject("pictureBox1.Image")));this.pictureBox1.Location = new System.Drawing.Point(171, 12);this.pictureBox1.Name = "pictureBox1";this.pictureBox1.Size = new System.Drawing.Size(148, 136);this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom;this.pictureBox1.TabIndex = 0;this.pictureBox1.TabStop = false;// // labMessage// this.labMessage.AutoSize = true;this.labMessage.Location = new System.Drawing.Point(169, 196);this.labMessage.Name = "labMessage";this.labMessage.Size = new System.Drawing.Size(137, 12);this.labMessage.TabIndex = 1;this.labMessage.Text = "正在加载中，请等待……";// // LoadingFrm// this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;this.ClientSize = new System.Drawing.Size(513, 248);this.Controls.Add(this.labMessage);this.Controls.Add(this.pictureBox1);this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;this.Name = "LoadingFrm";this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;this.Text = "Loading";this.TopMost = true;((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();this.ResumeLayout(false);this.PerformLayout();}#endregionprivate System.Windows.Forms.PictureBox pictureBox1;private System.Windows.Forms.Label labMessage;}
}

为了外部的实时更新提示信息，定义一个Message属性，来更新内容的提示信息控件，这里用的是this.Invoke，因为UI线程有可能与执行线程不相同。同理，当关闭窗体时，也需要处理一下。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Reflection.Emit;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace AliWorkbench.Load
{public partial class LoadingFrm : Form{public LoadingFrm(){InitializeComponent();}public string Message{set{if (labMessage.InvokeRequired){Action action = delegate () { labMessage.Text = value; };labMessage.Invoke(action);}}}public void CloseAll(){if (this.InvokeRequired){//这里利用委托进行窗体的操作，避免跨线程调用时抛异常，后面给出具体定义CONSTANTDEFINE.SetUISomeInfo UIinfo = new CONSTANTDEFINE.SetUISomeInfo(new Action(() =>{while (!this.IsHandleCreated){;}if (this.IsDisposed)return;if (!this.IsDisposed){this.Dispose();}}));this.Invoke(UIinfo);}else{if (this.IsDisposed)return;if (!this.IsDisposed){this.Dispose();}}}}class CONSTANTDEFINE{public delegate void SetUISomeInfo();}}

第二步：定义一个等待窗体的管理类，主要有三个成员：1、Show()，是在一个线程中；2、Message属性，是设置窗体的属性，这里需要判断窗体是否存在，不存在就等待，其实可以定义重试次数，避免错误调用顺序，设置属性也是在一个线程中执行；3、Close()也是在线程中，也需要判断窗体是否存在。​​​​​​​

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;namespace AliWorkbench.Load
{public static class LoadingManage{static LoadingFrm _loading;public static void Show(){Task.Run(() =>{_loading = new LoadingFrm();_loading.ShowDialog();});}public static void Close(){Task.Run(() =>{while (_loading == null || _loading.IsDisposed){Thread.Sleep(10);}_loading.CloseAll();});}public static string Message{set{while (_loading == null || _loading.IsDisposed){Thread.Sleep(10);}Task.Run(() =>{_loading.Message = value;});}}}}

封装后，调用就简单了，如下，首先Show()，然后执行密集服务，在执行过程中，可以更新Message属性，最后执行完就可以Close()了。​​​​​​​

 LoadingManage.Show();for (var i = 0; i < 30; i++){LoadingManage.Message = $"正在执行第{i}条数据……";Thread.Sleep(1000);}LoadingManage.Close();