我发现 HttpWebRequest 对不存在的资源抛出 WebException。
在我看来,这很奇怪,因为 HttpWebResponse 有 StatusCode 属性(NotFount 项存在)。
您认为这有什么原因吗?或者这只是开发人员的问题?
var req = (HttpWebRequest)WebRequest.Create(someUrl);
using (HttpWebResponse response = (HttpWebResponse)req.GetResponse()) {
if (response.StatusCode == HttpStatusCode.OK) { ...}
}
这确实是一个令人沮丧的问题,可以通过使用以下扩展方法类并调用 request.BetterGetResponse() 来解决
//-----------------------------------------------------------------------
//
// Copyright (c) 2011 Garrett Serack. All rights reserved.
//
//
// The software is licensed under the Apache 2.0 License (the "License")
// You may not use the software except in compliance with the License.
//
//-----------------------------------------------------------------------
namespace CoApp.Toolkit.Extensions {
using System;
using System.Net;
public static class WebRequestExtensions {
public static WebResponse BetterEndGetResponse(this WebRequest request, IAsyncResult asyncResult) {
try {
return request.EndGetResponse(asyncResult);
}
catch (WebException wex) {
if( wex.Response != null ) {
return wex.Response;
}
throw;
}
}
public static WebResponse BetterGetResponse(this WebRequest request) {
try {
return request.GetResponse();
}
catch (WebException wex) {
if( wex.Response != null ) {
return wex.Response;
}
throw;
}
}
}
}
您可以在我关于此主题的博客文章中阅读更多相关内容:http://fearthecowboy.com/2011/09/02/fixing-webrequests-desire-to- throw-exceptions-instead-of-returning-status/ http://fearthecowboy.com/2011/09/02/fixing-webrequests-desire-to-throw-exceptions-instead-of-returning-status/
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