您可以使用的 WebRequest.Register preFIX（） 做到这一点。您将需要实施 IWebRequestCreate 返回一个自定义的的WebRequest 返回一个自定义的 WebResponse类，系统可最终用于获取从URI中的数据。它可能是这样的：

You can use WebRequest.RegisterPrefix() to do that. You will need to implement IWebRequestCreate that returns a custom WebRequest that returns a custom WebResponse, which can finally be used to get the data from the URI. It could look like this:

public class DataWebRequestFactory : IWebRequestCreate
{
    class DataWebRequest : WebRequest
    {
        private readonly Uri m_uri;

        public DataWebRequest(Uri uri)
        {
            m_uri = uri;
        }

        public override WebResponse GetResponse()
        {
            return new DataWebResponse(m_uri);
        }
    }

    class DataWebResponse : WebResponse
    {
        private readonly string m_contentType;
        private readonly byte[] m_data;

        public DataWebResponse(Uri uri)
        {
            string uriString = uri.AbsoluteUri;

            int commaIndex = uriString.IndexOf(',');
            var headers = uriString.Substring(0, commaIndex).Split(';');
            m_contentType = headers[0];
            string dataString = uriString.Substring(commaIndex + 1);
            m_data = Convert.FromBase64String(dataString);
        }

        public override string ContentType
        {
            get { return m_contentType; }
            set
            {
                throw new NotSupportedException();
            }
        }

        public override long ContentLength
        {
            get { return m_data.Length; }
            set
            {
                throw new NotSupportedException();
            }
        }

        public override Stream GetResponseStream()
        {
            return new MemoryStream(m_data);
        }
    }

    public WebRequest Create(Uri uri)
    {
        return new DataWebRequest(uri);
    }
}

这仅支持base64编码，但对于URI编码的支持，可以很容易地补充说。

This supports only base64 encoding, but support for URI encoding could be easily added.

然后注册它是这样的：

WebRequest.RegisterPrefix("data", new DataWebRequestFactory());

是的，这确实检索数据的工作：XAML文件中的图片

And yes, this does work for retrieving data: images in XAML files.