Classic example of loading interface in C#

This article mainly introduces the common methods of loading interface in C#, involving the operation of forms, which is of great practical value. Friends in need can refer to it

The example of this article describes the loading interface in C# common methods. Share it with everyone for your reference. The specific method analysis is as follows:

Method 1. Using event delegation method
Object: Main form: FrmMain Loading form: FrmLoading
Idea:
Display the window before the main form is loaded Body FrmLoading, when the main form is loaded (when it is displayed for the first time), close FrmLoading

The C# code is as follows:

The code is as follows:

using System;using System.Collections.Generic;using
 System.ComponentModel;using System.Data;using System.Drawing;using
 System.Linq;using
 System.Text;using
 System.Windows.Forms;using
 System.Threading;
namespace CDemoTest{
    public partial class FrmMain : Form
    {
        private FrmLoading loadForm;
        public FrmMain()
        {
            //创建加载窗体
             loadForm = new FrmLoading();
            //指定窗体加载完毕时的事件
            this.Shown += FrmLoading_Close; 
            loadForm.Show();
            //主窗体初始化方法
            InitializeComponent();
            }
        //声明关闭加载窗体方法
        private void FrmLoading_Close(object sender, EventArgs e)
        {
        loadForm.Close();
        }
        private void FrmMain_Load(object sender, EventArgs e)
        {
        Thread.Sleep(3000);
       }
   }
}

Method 2 .
① In the Main method, display the startup screen first, and be careful to use Show instead of ShowDialog.
② Then follow the normal way, Application.Run(mainForm);
③ In the constructor of mainForm, start the loading thread.
④ Set a flag in mainForm. If the loading is completed, the flag is set to a certain value.
⑤ For the form used as the startup screen, pay attention to detecting the flag in mainForm. If the main form is loaded, it will close itself.

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