VB.NET如何检查网页是否存在

Question

是否可以在 vb.net 应用程序中检查网页是否存在？

Answer 1

您可以通过请求有问题的网页并查看是否有错误消息来查明。

    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