c# 播放gif动图

以下是在C#中播放gif动图的示例代码：

using System;
using System.Drawing;
using System.Windows.Forms;

namespace GifPlayer
{
    public partial class Form1 : Form
    {
        private Image _gifImage;
        private FrameDimension _dimension;
        private int _frameCount;
        private int _currentFrame;

        public Form1()
        {
            InitializeComponent();
        }

        private void btnOpen_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Filter = "GIF files (*.gif)|*.gif";
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                _gifImage = Image.FromFile(openFileDialog.FileName);
                _dimension = new FrameDimension(_gifImage.FrameDimensionsList[0]);
                _frameCount = _gifImage.GetFrameCount(_dimension);
                _currentFrame = 0;
                timer1.Interval = (int)Math.Round(100 / _gifImage.GetPropertyItem(0x5100).Value[0]) * 10;
                timer1.Start();
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            _gifImage.SelectActiveFrame(_dimension, _currentFrame);
            pictureBox1.Image = _gifImage;
            _currentFrame++;
            if (_currentFrame == _frameCount)
            {
                _currentFrame = 0;
            }
        }
    }
}

这个示例代码使用了一个计时器来循环播放gif动图。首先，通过打开文件对话框选择一个gif文件，然后获取gif文件的帧数和每一帧的时间间隔。接着，将计时器的间隔设置为每一帧的时间间隔，然后在计时器的Tick事件中选择当前帧并将其显示在PictureBox控件中。最后，将当前帧的索引加1，如果当前帧是最后一帧，则将其重置为第一帧。