如何静默绕过失败的REST调用webRequest.GetResponse()(找不到404)? [英] How can I silently bypass a REST call to webRequest.GetResponse() that fails (404 Not Found)?
问题描述
当我传递一个可识别的参数时，我的代码可以工作，但是当我传递的arg无法被识别时，我会收到一条错误消息.我不一定在每种情况下都期望(或需要)一个良好的响应，但是我不想生根发芽".没有结果可退给我的情况除外.
I've got code that works when I pass a recognized argument, but when the arg I pass is not recognized, I get an error message. I don't necessarily expect (or need) a good response in every case, but I don't want to "bothered" by an exception when there are no results to return to me.
我将举几个例子.如果我将此传递给(HttpWebRequest)WebRequest(使用"tt0003854"作为参数):
I'll give a couple of examples. If I pass this to (HttpWebRequest)WebRequest (using "tt0003854" as the arg):
...我得到了我想要的东西:
...I get what I want back:
{"id":347745，结果":[{"iso_3166_1":"US"，"release_dates":[{"certification"":"，"iso_639_1": "，"note":"，"release_date":"1936-12-12T00:00:00.000Z"，"type":3}]}]}}
{"id":347745,"results":[{"iso_3166_1":"US","release_dates":[{"certification":"","iso_639_1":"","note":"","release_date":"1936-12-12T00:00:00.000Z","type":3}]}]}
其他尝试也是如此.但是，有些失败，例如当我使用"tt0005929"时，作为arg:
And the same is true for other attempts. Some, though, fail, such as when I use "tt0005929" as the arg:
...返回:
{成功":false，"status_code":34，"status_message":资源您 找不到所请求的内容.}
{"success":false,"status_code":34,"status_message":"The resource you requested could not be found."}
此行失败:
var webResponse = (HttpWebResponse)webRequest.GetResponse();
...然后掉到catch块，这时我得到一个错误消息，消息为:"远程服务器返回错误:(404)未找到"
...and falls to the catch block, at which point I get an err msg that says, "The remote server returned an error: (404) Not Found"
没关系，如果找不到，但我不希望该应用程序因错误消息而停止.我该怎么做才能忽略"404"?
It's "okay" if it's not found, but I don't want the app to be stopped by an error message. What can I do to ignore the "404"s?
关于上下文，这是我的更多代码:
Here is more of my code, for context:
try
{
var webRequest = (HttpWebRequest)WebRequest.Create(RESTStringToGetMPAARatingForMovieId);
webRequest.Method = "GET"; // <-- GET is the default method/verb, but it's here for clarity
var webResponse = (HttpWebResponse)webRequest.GetResponse();
if (webResponse.StatusCode == HttpStatusCode.NotFound)
{
continue; // this is not reached, even when I get the error
}
if ((webResponse.StatusCode != HttpStatusCode.OK) || (webResponse.ContentLength == 0))
{
continue; // this is not reached, either
}
if ((webResponse.StatusCode == HttpStatusCode.OK) && (webResponse.ContentLength > 0))
{
StreamReader streamReader = new StreamReader(webResponse.GetResponseStream());
string s = streamReader.ReadToEnd();
. . .
}
else
{ // I don't see this message
MessageBox.Show(string.Format("Status code == {0}, Content length == {1}",
webResponse.StatusCode, webResponse.ContentLength));
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
推荐答案
第一个:强制转换或方法调用是否抛出错误? (只需将通话拆分为两行)
第二:您可以在该行中放置一个try {...} catch(Exception ex) /*{MessageBox.Show(Ex.Message)*/}块，但是，必须确保即使使用错误的值，以后的代码也可以工作，请确保对其进行测试.
First: Is the cast or the method call throwing the error? (Simply split the call and cast to two lines)
Second: You can put a try {...} catch(Exception ex) /*{MessageBox.Show(Ex.Message)*/} block around the line, however, you must make sure that the later code works even with the wrong value, make sure to test it.
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