Question

我有一个包含https和http端点的SL应用。如果我在http上访问端点，那么只需要一个加载外部图像的屏幕 http://somedomain.com/domaimage.jpg

它会正常工作。

如果我在https：//上访问SL应用程序，然后加载相同的图像，它甚至不会尝试为图像发出Web请求。

为什么SL在https上运行时我不会请求外部内容？我在clientaccesspolicy.xml

中有这个

<?xml version="1.0" encoding="utf-8"?> <access-policy> <cross-domain-access> <policy> <allow-from http-request-headers="*" http-methods="*"> <domain uri="http://*"/> <domain uri="https://*"/> </allow-from> <grant-to> <resource path="/" include-subpaths="true"/> </grant-to> </policy> </cross-domain-access> 这是我的crossdomain.xml

<?xml version="1.0"?>
<cross-domain-policy>
    <allow-access-from domain="*" />
</cross-domain-policy>

由于

史蒂夫

Answer 1

现在使用图片代理访问外部内容，如果它可以帮助任何人

ImageProxy.ashx

public class ImageUrlProxy : IHttpHandler
{

    public void ProcessRequest(HttpContext context)
    {
        try
        {
            string url = context.Request.Headers["Url"];
            var client = new WebClient();
            byte[] imageDataBytes = client.DownloadData(url);
            context.Response.ContentType = "application/json;";
            context.Response.Write(JsonConvert.SerializeObject(imageDataBytes));
        }
        catch (Exception)
        {

            throw;
        }
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}

助手类：

public static class ImageProxyHelper
{
    public static void GetImageByProxy(string url, Action<BitmapImage> callback)
    {
        if (callback == null) return;
        var client = new WebClient();
        client.DownloadStringCompleted += (sender, args) =>
        {
            if (args.Error == null)
            {
                var buffer = JsonConvert.DeserializeObject<byte[]>(args.Result);
                var im = new BitmapImage() { CreateOptions = BitmapCreateOptions.None };
                im.SetSource(new MemoryStream(buffer));
                callback(im);
            }
        };
        client.Headers["Url"] = url;
        client.DownloadStringAsync(UrlBuilder("ImageUrlProxy.ashx"));
    }


    public static Uri UrlBuilder(string fragment)
    {
        var uriBuilder = new UriBuilder(Application.Current.Host.Source.Scheme,
            Application.Current.Host.Source.Host,
            Application.Current.Host.Source.Port, fragment);
        return uriBuilder.Uri;
    }
}

然后来自silverlight：

ImageProxyHelper.GetImageByProxy("http://externaldomain.com/image.jpg", p=>{
        //Do something here
})

这可以扩展为返回任何外部内容^^

Answer 2

您遇到与此问题相同的问题

Https and http Image URL Not loading in silverlight

归结为Silverlight中的交叉方案调用

使用https时Silverlight无法访问内容

2 个答案: