从byte []显示图像 [英] Display image from byte[ ]

问题描述

我使用C＃，wpf。我有一个图像，它以以下形式存储： byte []

I use C#, wpf. I have an image, it is stored in the form of: byte[ ]

public interface IFile
{
    int Id { get; set; }
    byte[] FileData { get; set; }        
    string FileName { get; set; }
    int? FileSize { get; set; }
    string FileExtension { get; set; }
}

如何显示图像（FileData byte [] ）在表单上？

How can I display my image (FileData byte[ ]) on the form?

<GroupBox BorderThickness="1">
    <Image Source="..."/>
</GroupBox>

我必须写 Source =...，如果我从byte []创建一个临时文件？

I have to write in Source="...", if I create a temporary file from a byte[ ]?

推荐答案

如果你有一个视图模型类实现你的 IFile 接口，并且它的 FileData 属性包含一个像PNG或JPEG一样的编码图像缓冲区，你可以直接绑定到这样的属性：

Provided that you have a view model class that implements your IFile interface, and that its FileData property contains an encoded image buffer like a PNG or JPEG, you could directly bind to the property like this:

<Image Source="{Binding FileData}"/>

这是因为WPF提供了来自多种源类型的内置自动类型转换，包括 byte [] ，到 ImageSource 。

This is because WPF provides built-in, automatic type conversion from several source types, including byte[], to ImageSource.

类型转换由类 ImageSourceConverter 执行，注册为TypeConverter

The type conversion is performed by the class ImageSourceConverter, which is registered as TypeConverter

[TypeConverterAttribute(typeof(ImageSourceConverter))]
public abstract class ImageSource ...

并做类似的事情：

byte[] buffer = ...
ImageSource result;
using (var stream = new MemoryStream(buffer))
{
    result = BitmapFrame.Create(
        stream, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
}

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