在DevExpress中，当我们查询sql语句或处理大量的数据时，为了防止界面假死状态，加一个提示框比较人性化。

1.建立一个窗口

2.引用以下DevExpress.Data.v18.2.dll，DevExpress.Utils.v18.2.dll

3.代码

using DevExpress.Utils;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            WaitDialogForm WaitBeforeLogin = null;      //实例化
            new Thread((ThreadStart)delegate
            {
                WaitBeforeLogin = new WaitDialogForm("请稍候...", "正在查询");
                int start_x = (int)(this.Location.X + (this.Width - WaitBeforeLogin.Width) / 2);
                int start_y = (int)(this.Location.Y + (this.Height - WaitBeforeLogin.Height) / 2);
                WaitBeforeLogin.Location = new System.Drawing.Point(start_x, start_y);   //让等待窗体居中
                Application.Run(WaitBeforeLogin);
            }).Start();
            A();    //这里写需要执行耗时的方法
            WaitBeforeLogin.Invoke((EventHandler)delegate { WaitBeforeLogin.Close(); });

        }
        public void A()
        {
            for (int i = 0; i < 5; i++)
            {
                Thread.Sleep(1000);
            }
        }
    }
}

 4.最终效果

5.拓展功能如图

 5.1.代码

using DevExpress.Utils;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //WaitDialogForm WaitBeforeLogin = null;      //实例化
            //new Thread((ThreadStart)delegate
            //{
            //    WaitBeforeLogin = new WaitDialogForm("请稍候...", "正在查询");
            //    int start_x = (int)(this.Location.X + (this.Width - WaitBeforeLogin.Width) / 2);
            //    int start_y = (int)(this.Location.Y + (this.Height - WaitBeforeLogin.Height) / 2);
            //    WaitBeforeLogin.Location = new System.Drawing.Point(start_x, start_y);   //让等待窗体居中
            //    Application.Run(WaitBeforeLogin);
            //}).Start();
            //A();    //这里写需要执行耗时的方法
            //WaitBeforeLogin.Invoke((EventHandler)delegate { WaitBeforeLogin.Close(); });



            WaitDialogForm sdf = new WaitDialogForm("请稍候...", "正在查询");
            int start_x = (int)(this.Location.X + (this.Width - sdf.Width) / 2);
            int start_y = (int)(this.Location.Y + (this.Height - sdf.Height) / 2);
            sdf.Location = new System.Drawing.Point(start_x, start_y);   //让等待窗体居中
            int i = 10;
            for (int j = 1; j < i; j++)
            {
                Thread.Sleep(1000);
                sdf.SetCaption("执行进度（" + j.ToString() + "/" + i.ToString() + "）");
            }
            sdf.Close();

        }
        public void A()
        {
            for (int i = 0; i < 5; i++)
            {
                Thread.Sleep(1000);
            }
        }
    }
}

来源：DevExpress使用WaitDialogForm等待加载窗体_故里2130的博客-CSDN博客