如何在asp.net2.0中实现下面的代码？

Question

因为我使用asp.net2.0时，我使用下面的类我得到以下错误。

Error 1 : The type or namespace name 'var' could not be found (are you missing a using directive or an assembly reference?) 

没有得到任何错误

public static XElement GetGeocodingSearchResults(string address) 
{ 
    // Use the Google Geocoding service to get information about the user-entered address 
    // See http://code.google.com/apis/maps/documentation/geocoding/index.html for more info... 
    var url = String.Format("http://maps.google.com/maps/api/geocode/xml? 
    address={0}&sensor=false", HttpContext.Current.Server.UrlEncode(address)); 

    // Load the XML into an XElement object (whee, LINQ to XML!) 
    var results = XElement.Load(url); 

    // Check the status 
    var status =results.Element ("status").Value; 
    if (status != "OK" && status != "ZERO_RESULTS") 
     // Whoops, something else was wrong with the request... 
     throw new ApplicationException("There was an error with Google's Geocoding Service: " + status); 

    return results; 
} 

Answer 1

var I类具有used.How可以i的ASP.NET2.0使用此代码只是用于实际类型右侧的shortcut表达。

public static XElement GetGeocodingSearchResults(string address) 
{ 
    // Use the Google Geocoding service to get information about the user-entered address 
    // See http://code.google.com/apis/maps/documentation/geocoding/index.html for more info... 
    string url = String.Format("http://maps.google.com/maps/api/geocode/xml?address={0}&sensor=false", 
     HttpContext.Current.Server.UrlEncode(address)); 

    // Load the XML into an XElement object (whee, LINQ to XML!) 
    XElement results = XElement.Load(url); 

    // Check the status 
    string status =results.Element ("status").Value; 
    if (status != "OK" && status != "ZERO_RESULTS") 
     // Whoops, something else was wrong with the request... 
     throw new ApplicationException("There was an error with Google's Geocoding Service: " + status); 

    return results; 
} 

BUTLINQ to XML（和整个LINQ功能）是仅在.NET 3.5以上可用。你应该升级到.NET 3.5或switch toSystem.Xml