如何在WPF中使用动态URL绑定到图像？ [英] How to bind to an Image using a dynamic URL in WPF?

问题描述

我是WPF的新手，所以希望我能正确说出这个问题。我想做的是将< Image> 绑定到在线图像。但是，我要绑定的图像根据应用程序的状态而变化。例如，如果我想绑定到从列表中选择的Employee，我将从App.config中检索基本URL并使用该雇员的ID附加图像名称，如下所示：

I am new to WPF so hopefully I phrased the question correctly. What I'd like to do is bind my <Image> to an image online. However, the image I would like to bind to changes depending on the state of the application. For example, if I wanted to bind to an Employee selected from a list, I'd retrieve a base URL from my App.config and append the image name using the ID of the employee, like so:

var baseUrl = ConfigurationSettings.AppSettings["BaseImageUrl"];
var imageUrl = String.Format("{0}/{1}.jpg", baseUrl, employeeID);

问题是，我不确定如何在WPF中以声明方式进行操作。

The problem is, I'm not sure how to do this declaratively in WPF. Any help is greatly appreciated!

推荐答案

代码中是否有雇员对象？如果是这样，您可以公开基于该对象的员工ID构建的URI属性。

Do you have a employee object in your code? If so you could expose a URI property which is built based on the employee ID of the object.

否则，您的网站上是否会有一个asp.net页面可以提供服务图像（我不知道这样是否行得通，尽管这是一个想法）

Otherwise could you have a asp.net page on your website which serves up a image (I have no idea if this will work, it is a idea though)

因此在您的xaml中有这样的内容

so have something like this in your xaml

<Image Source="{Binding Path=EmployeeId, StringFormat='http://my.url.com/Image.aspx?employeeId={0}'}" />

Image.aspx是否会根据employeeId get变量流式传输图像？

Image.aspx would stream the image based on the employeeId get variable?

正如我说的那样，这可能有点错误，但是它可以工作，我认为雇员类的URI属性将是最干净的选择。

As I said there is probably a bit wrong with this but it could work, I think the URI property on a employee class would be the cleanest option though.

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