VB.NET如何检查网页是否存在 [英] VB.NET how to check if a webpage exists

问题描述

是否可以检查vb.net应用程序中是否存在网页?

Is it possible to check if a webpage exists or not in vb.net application ?

推荐答案

您可以通过请求有问题的网页并查看是否存在错误消息来找出答案.

You can find out by requesting the webpage in question and looking if there's an error message.

    Dim req As System.Net.WebRequest
    Dim res As System.Net.WebResponse

    req = System.Net.WebRequest.Create("http://www.google.com/werwerfsdfsdf")

    Try
        res = req.GetResponse()
    Catch e As WebException
        ' URL doesn't exists
    End Try

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