Question

我想在.Net Winform中展示动画gif。 怎么做？

我之前使用的是VB 6.0。

Answer 1

将一个图片框放在表单上，然后指定一个带有Gif扩展名的图片文件。或者：
以编程方式为gif设置动画图像将帧加载到带有代码的PictureBox中，这里是Gif类：

<强> VB.NET

Public Class GifImage
    Private gifImage As Image
    Private dimension As FrameDimension
    Private frameCount As Integer
    Private currentFrame As Integer = -1
    Private reverse As Boolean
    Private [step] As Integer = 1

    Public Sub New(path As String)
        gifImage = Image.FromFile(path)
        'initialize
        dimension = New FrameDimension(gifImage.FrameDimensionsList(0))
        'gets the GUID
            'total frames in the animation
        frameCount = gifImage.GetFrameCount(dimension)
    End Sub

    Public Property ReverseAtEnd() As Boolean
        'whether the gif should play backwards when it reaches the end
        Get
            Return reverse
        End Get
        Set
            reverse = value
        End Set
    End Property

    Public Function GetNextFrame() As Image

        currentFrame += [step]

        'if the animation reaches a boundary...
        If currentFrame >= frameCount OrElse currentFrame < 1 Then
            If reverse Then
                [step] *= -1
                '...reverse the count
                    'apply it
                currentFrame += [step]
            Else
                currentFrame = 0
                '...or start over
            End If
        End If
        Return GetFrame(currentFrame)
    End Function

    Public Function GetFrame(index As Integer) As Image
        gifImage.SelectActiveFrame(dimension, index)
        'find the frame
        Return DirectCast(gifImage.Clone(), Image)
        'return a copy of it
    End Function
End Class

<强> C＃

public class GifImage
{
    private Image gifImage;
    private FrameDimension dimension;
    private int frameCount;
    private int currentFrame = -1;
    private bool reverse;
    private int step = 1;

    public GifImage(string path)
    {
        gifImage = Image.FromFile(path);
        //initialize
        dimension = new FrameDimension(gifImage.FrameDimensionsList[0]);
        //gets the GUID
        //total frames in the animation
        frameCount = gifImage.GetFrameCount(dimension);
    }

    public bool ReverseAtEnd {
        //whether the gif should play backwards when it reaches the end
        get { return reverse; }
        set { reverse = value; }
    }

    public Image GetNextFrame()
    {

        currentFrame += step;

        //if the animation reaches a boundary...
        if (currentFrame >= frameCount || currentFrame < 1) {
            if (reverse) {
                step *= -1;
                //...reverse the count
                //apply it
                currentFrame += step;
            }
            else {
                currentFrame = 0;
                //...or start over
            }
        }
        return GetFrame(currentFrame);
    }

    public Image GetFrame(int index)
    {
        gifImage.SelectActiveFrame(dimension, index);
        //find the frame
        return (Image)gifImage.Clone();
        //return a copy of it
    }
}

C＃用法：

使用上面显示的GifImage.cs类，在PictureBox，Timer和Button中拖放一个Winform项目。

public partial class Form1 : Form
{
    private GifImage gifImage = null;
    private string filePath = @"C:\Users\Jeremy\Desktop\ExampleAnimation.gif";

    public Form1()
    {
        InitializeComponent();
        //a) Normal way
        //pictureBox1.Image = Image.FromFile(filePath);

        //b) We control the animation
        gifImage = new GifImage(filePath);
        gifImage.ReverseAtEnd = false; //dont reverse at end
    }

    private void button1_Click(object sender, EventArgs e)
    {
        //Start the time/animation
        timer1.Enabled = true;
    }

    //The event that is animating the Frames
    private void timer1_Tick(object sender, EventArgs e)
    {
        pictureBox1.Image = gifImage.GetNextFrame();
    }
}

enter image description here

Answer 2

开发@ JeremyThompson的答案我想添加一个代码片段来展示如何实现第一种方法，因为它更简单，并且不需要你手动设置gif的动画，看到{{1有一个内置的功能来处理这种情况。只需在表单中添加PictureBox，然后在表单构造函数中将图像路径分配给PictureBox

C＃

PictureBox.ImageLocation

VB.Net

 public PictureForm()
 {
      InitializeComponent();
      pictureBoxGif.ImageLocation = "C:\\throbber.gif";
 }

在我看来，这是一个更简单的解决方案，特别是对于.NET新手。

Answer 3

我已经玩过这个和动画播放，前提是你不在同一个线程上执行另一个长时间运行的操作。当你执行另一个长时间运行的操作时，你想要在另一个线程中执行它。

最简单的方法是使用BackgroundWorker组件，您可以从工具箱中拖动到表单上。然后，您将长时间运行的操作代码放在BackgroundWorker的DoWork（）事件中。最后一步是通过调用BackgroundWorker实例的RunWorkerAsync（）方法来调用您的代码。

PictureBox可以在Windows应用程序中显示动画GIF吗？

3 个答案: