对 WCF 数据服务的 WebClient 调用正在删除特定的异常消息
我有一个 WCF 数据服务，其上有一个通过 WebClient 调用的 ServiceOperation（ServiceOperation 返回非实体数据，因此我必须解析来自 WebClient 的 XML 结果）。进行调用的代码如下所示（我已从代码中删除了一些敏感信息）：
WebClient wc = new WebClient();
string requestXMLresult = wc.DownloadString(new Uri(string.Format("http://localhost:49370/DataService.svc/ServiceOperationName?<params, etc>")));
XDocument xdoc = XDocument.Parse(requestXMLresult);
// <etc>
在（例如）身份验证期间，我的服务可以抛出这样的 DataServiceException：
throw new DataServiceException(401, "The specified user did not have permissions to any resources.");
问题是，在客户端，当该异常时回来后我丢失了有关异常的额外文本。我得到的实际异常是“(401)未经授权”，就是这样。我检查了InnerException、异常消息等，似乎丢失了。
有没有办法通过 WebClient 连接保留该消息？我不确定这是否是 WCF 数据服务问题，或者是跨 WebClient 连接抛出异常的一般问题（我怀疑是后者，但我对此还很陌生）。
非常感谢任何帮助！
I have a WCF Data Service with a ServiceOperation on it that is being called via WebClient (the ServiceOperation returns non-entity data, so I have to parse the XML result from the WebClient). The code to make the call looks like this (I've removed some sensitive info from the code):
WebClient wc = new WebClient();
string requestXMLresult = wc.DownloadString(new Uri(string.Format("http://localhost:49370/DataService.svc/ServiceOperationName?<params, etc>")));
XDocument xdoc = XDocument.Parse(requestXMLresult);
// <etc>
During (for example) authentication, my service can throw a DataServiceException like this:
throw new DataServiceException(401, "The specified user did not have permissions to any resources.");
The problem is, on the client end, when that exception comes back I lose the extra text on the exception. The actual exception I get says "(401) Unauthorized", and that's it. I have checked the InnerException, exception messages, etc, and it seems to be lost.
Is there a way to preserve that message across a WebClient connection? I am not sure if this is a WCF Data Service problem, or a problem in general with exceptions thrown across WebClient connections (I suspect the latter, but I'm pretty new at this).
Any help is much appreciated!
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我认为您不能这样做，因为 401 是带有标准消息的标准 HTTP 错误代码。
如果您使用自己的文本返回 200，这可能会起作用，但任何 4* 或 5* 代码都只会遵循标准消息。
I don't think you can do that, because a 401 is a standard HTTP error code with a standard message.
If you return a 200 with your own text, that might work, but any of the 4* or 5* codes would just stick to the standard messages.