Question

你好，我有一个按钮，当我点击它时，它加载用户控件，花了一点时间。我想在加载时显示gif。我该怎么办？

编辑：我想将usercontrol添加到后台工作者的面板上。

panel3.Controls.Add(hesaplar.Instance);

hesaplar.Instance.Dock = DockStyle.Fill;

hesaplar.Instance.BringToFront();

Answer 1

如果要在加载时向用户显示.gif动画，可以使用Multithreading进行并行执行，Action Delegate调用安全的GUI更新。
请在代码中查看我的评论例如：

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;

namespace WindowsFormsApplication21
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            // show gif on a different thread until LongTask finish executing
            System.Threading.Thread waitThread = new System.Threading.Thread(ShowGif);
            waitThread.Start();
            // start a new thread to execute LongTask() parallel to the waitThread 
            System.Threading.Thread longTaskThread = new System.Threading.Thread(LongTask);
            longTaskThread.Start();
        }

        // put the code of your task that you want to execute in the background in that method
        private void LongTask()
        {
            // long load...
            for (int i = 0; i < 10; i++)
            {
                System.Threading.Thread.Sleep(1000);
            }

            // the "long task" inside the method finished to execute - dispose safely the picturebox from the GUI
            panel3.Invoke(new Action(pictureBox1.Dispose));
            // add user control to panel3
            panel3.Invoke(new Action(AddUserControl));
            // promt to screen
            label1.Invoke(new Action(NotifyTaskHasFinished));
        }

        private void AddUserControl()
        {
            UserControl1 uc = new UserControl1();
            panel3.Controls.Add(uc);
        }

        private void ShowGif()
        {
            // use action delegate to update GUI changes from another thread
            panel3.Invoke(new Action(AddGif));
        }

        private void AddGif()
        {
            // show .gif animation inside picturebox1
            pictureBox1.Image = WindowsFormsApplication21.Properties.Resources.raw_demo;
        }

        private void NotifyTaskHasFinished()
        {
            label1.Text = "LongTask() method has finished and user control was loaded";
        }
    }
}

如何在加载用户控件时显示gif？

1 个答案: