我建立了谷歌地图和weather.com的混搭,每次其中一个服务器没有响应时,我的应用程序也会挂起。你认为我可以做些什么来防止或尽量减少我的网络应用程序的挂起?像你一样挂断t 导航离开该页面....我在我的应用程序代码中获得了此代码以访问天气服务;
Public Class WeatherIn
Private _path As String
Private _cachedFile As String
Public Sub New(ByVal path As String)
_path = path
_cachedFile = String.Format("{0}\WeatherInCache.xml", _path)
End Sub
Public Function GetWeather(ByVal arg As String) As String
Return _getWebWeather(arg)
End Function
Private Function _getCachedWeather() As String
Dim str As String = String.Empty
Using reader As New StreamReader(_cachedFile)
str = reader.ReadToEnd()
End Using
Return str
End Function
Private Function _getWebWeather(ByVal arg As String) As String
Dim baseUrl As String = "http://xoap.weather.com/weather/local/{0}?cc=*&dayf=5&link=xoap&prod=xoap&par={1}&key={2}"
Dim jane As String = arg
Dim james As String = "api key"
Dim john As String = "another api key"
Dim url As String = String.Format(baseUrl, jane, james, john)
Using client As New WebClient()
Try
Dim xml As New XmlTextReader(client.OpenRead(url))
Dim xslt As New XslCompiledTransform()
xslt.Load(_path + "/Pathto.xslt")
Using writer As New StreamWriter(_cachedFile)
xslt.Transform(xml, Nothing, writer)
End Using
Return _getCachedWeather()
Catch exception As WebException
Dim xmlStr As String = "<errorDoc>"
xmlStr += "<alert>An Error Occurred!</alert>"
xmlStr += [String].Format("<message>{0}</message>", exception.Message)
xmlStr += "</errorDoc>"
Dim doc As New XmlDocument()
doc.LoadXml(xmlStr)
Dim reader As New XmlNodeReader(doc)
Dim xslt As New XslCompiledTransform()
xslt.Load(_path + "/Pathto.xslt")
Dim resultDocument As New XmlDocument()
Using writer As XmlWriter = resultDocument.CreateNavigator().AppendChild()
xslt.Transform(reader, DirectCast(Nothing, XsltArgumentList), writer)
End Using
Return resultDocument.OuterXml
End Try
End Using
End Function
然后我在我的页面上使用了上面的类,在那里我显示了这样的天气:
'specific zip code or could be retrieved from querystring for dynamic retrieval
var jay="94576"
Dim weather As New WeatherIn(Server.MapPath(String.Empty))
Dim weatherData As String = weather.GetWeather(jay)
Response.ContentType = "text/xml"
Response.CacheControl = "no-cache"
Response.Write(weatherData)
我通过javascript检索数据并在页面上写入。大多数时候它的weather.com出现故障。我对谷歌地图没有任何问题,它的可靠性......任何人都有解决方案,如果我的页面也挂了远程服务器没有响应?如果远程服务器有响应,混搭运行顺利...