C# 在运行时将字节 [] 加载到图像中
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Load a byte[] into an Image at Runtime
提问by user70192
I have a byte[]that is represented by an Image. I am downloading this Imagevia a WebClient. When the WebClienthas downloaded the picture and I reference it using its URL, I get a byte[]. My question is, how do I load a byte[]into an Imageelement in WPF? Thank you.
我有一个byte[]由Image. 我正在Image通过WebClient. 当WebClient下载了图片并且我使用它的 URL 引用它时，我得到一个byte[]. 我的问题是，如何将 a 加载byte[]到ImageWPF 中的元素中？谢谢你。
Note: This is complementary to the question I asked here: Generate Image at Runtime. I cannot seem to get that approach to work, so I am trying a different approach.
注意：这是对我在这里提出的问题的补充：在运行时生成图像。我似乎无法让这种方法发挥作用，所以我正在尝试不同的方法。
采纳答案by configurator
You can use a BitmapImage, and sets its StreamSourceto a stream containing the binary data. If you want to make a streamfrom a byte[], use a MemoryStream:
您可以使用BitmapImage, 并将其StreamSource设置为包含二进制数据的流。如果stream要从 a制作a byte[]，请使用 a MemoryStream：
MemoryStream stream = new MemoryStream(bytes);
回答by Jobi Joy
Create a BitmapImagefrom the MemoryStreamas below:
BitmapImage从MemoryStream下面创建一个：
MemoryStream byteStream = new MemoryStream(bytes);
BitmapImage image = new BitmapImage();
image.BeginInit();
image.StreamSource = byteStream;
image.EndInit();
And in XAML you can create an Imagecontrol and set the above imageas the Sourceproperty.
在 XAML 中，您可以创建一个Image控件并将上述内容设置image为Source属性。
回答by Thomas Amar
In .Net framework 4.0
在 .Net 框架 4.0 中
using System.Drawing;
using System.Web;
private Image GetImageFile(HttpPostedFileBase postedFile)
{
if (postedFile == null) return null;
return Image.FromStream(postedFile.InputStream);
}
回答by Kevin B Burns
One way that I figured out how to do it so that it was both fast and thread safe was the following:
我想出如何做到既快速又线程安全的一种方法如下：
var imgBytes = value as byte[];
if (imgBytes == null)
return null;
using (var stream = new MemoryStream(imgBytes))
return BitmapFrame.Create(stream,BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
I threw that into a converter for my WPF application after running the images as Varbinary from the DB.
在将图像作为 Varbinary 从数据库运行后，我将其放入 WPF 应用程序的转换器中。
