C# GeoCodeRequest（）构造函数返回null

我正在尝试创建一个使用Bing地理编码soap服务的wcf服务。但当我尝试使用它的构造函数设置init一个新的GeoCodeRequest时，它会返回null。 当我调用

request.Query=address时我在引用
请求时收到一个空值错误

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.");
        }

首先，代码缺少凭据的初始化

request.Credentials=new GeocodeService.Credentials（）

当您浏览时，您必须使用他们的应用程序来

对于所讨论的具体应用。请注意，这与您的帐户密钥不同。
首先，代码缺少凭据的初始化

    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);
            }

request.Credentials=new GeocodeService.Credentials（）

当您浏览时，您必须使用他们的应用程序来

对于所讨论的具体应用。请注意，这与您的帐户密钥不同。
您似乎缺少凭据的初始化
request.Credentials=new GeocodeService.Credentials（）我想你经历了一些事情，似乎不对劲。您确定在调用查询属性的getter的上下文中没有得到null引用异常吗？如果在构造函数调用之后添加一个（if request==null）抛出新异常，会发生什么？@Rich它现在工作正常。将在下面发布更新代码。@atbyrd我已在下面发布了我的评论和一些其他信息。您似乎缺少凭据的初始化
request.Credentials=new GeocodeService.Credentials（）我想你经历了一些事情，似乎不对劲。您确定在调用查询属性的getter的上下文中没有得到null引用异常吗？如果在构造函数调用之后添加一个（if request==null）抛出新异常，会发生什么？@Rich它现在工作正常。将在下面发布更新代码。@atbyrd我已在下面发布了我的评论和一些其他信息。
    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);
            }