C# 网页响应状态码
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Web Response status code
提问by user1590636
I have this simple function to get HTML pages and return it as a string; though sometimes I get a 404. How can I only return the HTML string only if the request was successful, and return something like BadRequestwhen it's a 404 or any other error status code?
我有一个简单的函数来获取 HTML 页面并将其作为字符串返回；虽然有时我会得到 404。我怎么能只在请求成功时才返回 HTML 字符串，并BadRequest在它是 404 或任何其他错误状态代码时返回类似的东西？
public static string GetPageHTML(string link)
{
using (WebClient client= new WebClient())
{
return client.DownloadString(link);
}
}
采纳答案by Darin Dimitrov
You could catch the WebException:
您可以捕获 WebException：
public static string GetPageHTML(string link)
{
try
{
using (WebClient client = new WebClient())
{
return client.DownloadString(link);
}
}
catch (WebException ex)
{
var statusCode = ((HttpWebResponse)ex.Response).StatusCode;
return "An error occurred, status code: " + statusCode;
}
}
Of course it would be more appropriate to catch this exception in the calling code and not even attempt to parse the html instead of putting the try/catch in the function itself.
当然，在调用代码中捕获此异常甚至不尝试解析 html 而不是将 try/catch 放在函数本身中会更合适。
