Question

我正在尝试在Excel中制作水印，为此我创建了一个System.Drawing.Image并将其转换为C＃中的System.Windows.Control图像我的问题是，在代码之后，image.source，image为null。我的代码：

        MemoryStream ms = new MemoryStream(); 
        imgWtrmrk.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
       System.Windows.Controls.Image image = new 
       System.Windows.Controls.Image();
        BitmapImage ix = new BitmapImage();
        ix.BeginInit();
        ix.CacheOption = BitmapCacheOption.OnLoad;
        ix.StreamSource = ms;
        ix.EndInit();
        image.Source = ix;

我尝试过很多东西，但无法解决问题。源不是null但我不能为它分配图像，

请帮助..

Answer 1

Heyho，也许这就是你要找的东西？

///<summary>
    /// Converts an System.Drawing.Image to an BitmapImage
    ///</summary>
    ///<param name="image">System.Drawing.Image</param>
    ///<param name="disposeImage">Image dispose</param>
    ///<param name="format">ImageFormat</param>
    ///<returns>BitmapImage or null</returns>
    public static BitmapImage ImageToBitmapImage(Image image, bool disposeImage = true, ImageFormat format = null)
    {
        if (image != null)
        {
            if (format == null)
            {
                format = ImageFormat.Tiff;
            }
            using (MemoryStream ms = new MemoryStream())
            {
                BitmapImage bmi = new BitmapImage();
                bmi.BeginInit();
                image.Save(ms, format);
                bmi.StreamSource = new MemoryStream(ms.ToArray());
                bmi.EndInit();
                bmi.Freeze();
                if (disposeImage)
                {
                    image.Dispose();
                }
                return bmi;
            }
        }
        return null;
    }

以下是将MemoryStream保存到文件的方法。（未经测试但应该有效）

///<summary>
    /// Save an System.Drawing.Image to an file
    ///</summary>
    ///<param name="image">System.Drawing.Image</param>
    ///<param name="filePath">Physical path (C:\someimg.bmp)</param>
    ///<param name="disposeImage">Image dispose</param>
    ///<param name="format">ImageFormat</param>
    ///<returns>bool</returns>
    public static bool ImageToFile(Image image, string filePath, bool disposeImage = true, ImageFormat format = null)
    {
        if (image != null)
        {
            if (format == null)
            {
                format = ImageFormat.Tiff;
            }
            using (FileStream fs = new FileStream(filePath, FileMode.CreateNew, FileAccess.Write))
            {
                image.Save(fs, format);
            }
            if (disposeImage)
            {
                image.Dispose();
            }
            if (File.Exists(filePath))
            {
                return true;
            }
        }
        return false;
    }

实现看起来像（XAML）：

<Window x:Class="Multi_Explorer.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="450" Width="800">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Image Grid.Column="0" Width="50" Height="50" Source="{Binding BitmapImg}"/>

        <!-- or -->

        <ContentPresenter Grid.Column="1" Width="50" Height="50" Content="{Binding Img}"/>
    </Grid>
</Window>

代码背后：

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();

        BitmapImg = ImageToBitmapImage(System.Drawing.Image.FromFile(@"C:\some.img"));

        Img = new System.Windows.Controls.Image()
        {
            Source = BitmapImg
        };

        DataContext = this;
    }

    public System.Windows.Controls.Image Img
    {
        get; set;
    }

    public BitmapImage BitmapImg
    {
        get; set;
    }
}

此致

k1ll3r8e

Answer 2

System.Windows.Control 图像到 System.Drawing.Bitmap

public System.Drawing.Bitmap TakePhoto()
{
    var bmpImage = (System.Windows.Media.Imaging.BitmapImage)base.Source;
    var bmpFrame = System.Windows.Media.Imaging.BitmapFrame.Create(bmpImage);

    var bmpEncoder = new System.Windows.Media.Imaging.BmpBitmapEncoder();
    bmpEncoder.Frames.Add(bmpFrame);

    var ms = new System.IO.MemoryStream();
    bmpEncoder.Save(ms);

    return new System.Drawing.Bitmap(ms);
}

c＃System.Windows.Control Image到.bmp文件？

2 个答案: