獲取WPFImageControl中顯示影像的大小

我在 WPF 的影像控制元件中有一個影像。

如何在將高度和寬度轉換為 IN 的情況下獲取 imageControl 內影像的顯示大小？

uj5u.com熱心網友回復：

我測驗Tam Bui了解決方案，當影像尺寸小于影像控制元件尺寸時，它無法正常作業。

我的解決方案：

首先用（我的方法）轉換Image.Source成，然后轉換成，最后得到.的高度和寬度。MemoryStreamImageSourceToMemoryStreamBitmapImageBitmapImage

輸出（在 Visual Studio 2017、.Net Framework 4.5.2 中測驗）：

我在 png 和 HD jpg 影像上對其進行了測驗。

PNG：

高清JPG：

注意：如果此解決方案對您有幫助，請標記為答案（不要忘記為我投票）。

XAML：

    <Image x:Name="ImageControl" HorizontalAlignment="Left" Height="113" Margin="56,42,0,0" VerticalAlignment="Top" Width="159"/>
    <Button x:Name="ChooseImage" Content="Choose image" Click="ChooseImage_Click" HorizontalAlignment="Left" Height="25" Margin="392,276,0,0" VerticalAlignment="Top" Width="90"/>
    <Button x:Name="CalculateImageSize" Content="Calculate image size" Click="CalculateImageSize_Click" HorizontalAlignment="Left" Height="25" Margin="257,276,0,0" VerticalAlignment="Top" Width="120"/>

C＃：

Note: BitmapEncoder must be set to GifBitmapEncoder to calculate the size of HD images (or higher), otherwise it will not return the correct result.

    int Height = 0;
    int Width = 0;
    public System.IO.MemoryStream ImageSourceToMemoryStream(BitmapEncoder BitEncoder, ImageSource ImgSource)
    {
        System.IO.MemoryStream Stream = null;
        switch ((ImgSource as BitmapSource) != null)
        {
            case true:
                BitEncoder.Frames.Add(BitmapFrame.Create((ImgSource as BitmapSource)));
                Stream = new System.IO.MemoryStream();
                BitEncoder.Save(Stream);
                break;
        }
        return Stream;
    }
    private void ChooseImage_Click(object sender, RoutedEventArgs e)
    {
        System.Windows.Forms.OpenFileDialog OP = new System.Windows.Forms.OpenFileDialog();
        OP.Filter= "All files (*.*)|*.*|JPG (*.jpg)|*.jpg|BMP (*.bmp)|*.bmp|GIF (*.gif)|*.gif|PNG (*.png)|*.png";
        OP.AutoUpgradeEnabled = false;
        if (OP.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            var IMG = System.Drawing.Image.FromFile(OP.FileName);
            BitmapImage BitMapImage = new BitmapImage();
            BitMapImage.BeginInit();
            System.IO.MemoryStream MemoryStream = new System.IO.MemoryStream();
            IMG.Save(MemoryStream, System.Drawing.Imaging.ImageFormat.Png);
            MemoryStream.Seek(0, System.IO.SeekOrigin.Begin);
            BitMapImage.StreamSource = MemoryStream;
            BitMapImage.EndInit();
            ImageControl.Source = BitMapImage;
        }
    }
    private void CalculateImageSize_Click(object sender, RoutedEventArgs e)
    {
        BitmapImage BitMapImage = new BitmapImage();
        BitMapImage.BeginInit();
        //BitmapEncoder must be set to GifBitmapEncoder to calculate the size of HD images (or higher), otherwise it will not return the correct result
        var MemoryStream = ImageSourceToMemoryStream(new GifBitmapEncoder(), ImageControl.Source);
        MemoryStream.Seek(0, System.IO.SeekOrigin.Begin);
        BitMapImage.StreamSource = MemoryStream;
        BitMapImage.EndInit();
        Height = (int)BitMapImage.Height;
        Width = (int)BitMapImage.Width;
        ImageControl.Source = BitMapImage;
        Size DisplayedImageSize = new Size(Width, Height);
        MessageBox.Show("Image control width = "   ImageControl.Width.ToString()   ", Image width = "   Width.ToString()   ", Image control height = "   ImageControl.Height.ToString()   ", Image height = "   Height.ToString());
    }

Thanks

uj5u.com熱心網友回復：

Size displayedImageSize = new Size((int)imageControl.ActualWidth, (int)imageControl.ActualHeight);

標籤：C＃ wpf 图片 展示

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