GeoCodeRequest（）构造函数返回null

问题描述：

我试图创建一个使用Bing的Geocoding soap服务的wcf服务。但是，当我尝试使用它的构造函数设置init一个新的GeoCodeRequest时，它将返回一个null。当我拨打request.Query = address;时，我收到一个空值错误，指的是request。GeoCodeRequest（）构造函数返回null

public string RequestLocation(string address) 
     { 
      const string key = "mybingapplicationId"; 
      var request = new GeocodeRequest(); 
      request.Credentials.ApplicationId = key; 
      request.Query = address; 

      var filters = new ConfidenceFilter[1]; 
      filters[0] = new ConfidenceFilter { MinimumConfidence = Confidence.High }; 

      var geocodeOptions = new GeocodeOptions { Filters = filters }; 

      request.Options = geocodeOptions; 

      // Make the geocode request 
      var geocodeService = new GeocodeServiceClient("BasicHttpBinding_IGeocodeService"); 
      var geocodeResponse = geocodeService.Geocode(request); 

      return geocodeResponse.Results[0].DisplayName; 
     }

[单元测试]

[TestMethod()] 
     [HostType("ASP.NET")] 
     [AspNetDevelopmentServerHost("C:\\Development\\WcfService1\\WcfService1", "/")] 
     [UrlToTest("http://localhost:24842/")] 
     [DeploymentItem("WcfService1.dll")] 
     public void RequestLocationTest() 
     { 
      var target = new TestService.BingEngineClient(); 
      var address = string.Format("1600 Pennsylvania Avenue, {0}, {1}","Washington", "DC"); 
      var expected = string.Empty; 
      var actual = target.RequestLocation(address); 
      Assert.IsNotNull(actual); 
      Assert.Inconclusive("Verify the correctness of this test method."); 
     }

您似乎缺少凭证的初始化。 'request.Credentials = new GeocodeService.Credentials（）;' – 2012-04-19 16:57:09

我假设你已经通过[创建Bing地图帐户]（http://msdn.microsoft.com/en-us/library/gg650598.aspx） – 2012-04-19 17:59:40

东西似乎关闭。您确定在调用Query属性的getter的上下文中没有找到空引用异常吗？如果添加一个（如果request == null），则在构造函数调用之后立即抛出新异常会发生什么？ – Rich 2012-04-19 18:01:53

答

首先代码缺失证书的初始化。

request.Credentials = new GeocodeService.Credentials();

当你经过Creating a Bing Maps Account你必须使用他们的应用程序来
Create a Bing Maps Key有问题的具体应用。请注意，这与您的帐户密钥不同。

答

public string RequestLocation(string address) 
      { 

       var request = new GeocodeRequest {Credentials = new Credentials {ApplicationId = _key}, Query = address}; 
       var filters = new ConfidenceFilter[1]; 
       filters[0] = new ConfidenceFilter { MinimumConfidence = Confidence.High }; 

       var geocodeOptions = new GeocodeOptions { Filters = filters }; 

       request.Options = geocodeOptions; 

       // Make the geocode request 
       var geocodeService = new GeocodeServiceClient("BasicHttpBinding_IGeocodeService"); 
       var geocodeResponse = geocodeService.Geocode(request); 

       return string.Format("Longitude:{0},Latitude:{1}", geocodeResponse.Results[0].Locations[0].Longitude, 
            geocodeResponse.Results[0].Locations[0].Latitude); 
      }

GeoCodeRequest（）构造函数返回null

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