Asp.net mvc 3 使用restsharp将Json反序列化为类对象

我已经查阅了restsharp的文档，并在Google上搜索了解决方案，但无法找到解决此问题的方法：

我有一个asp.net mvc3应用程序，需要连接到quizlet.com以访问公共闪存卡。我添加了对restsharp的引用，并创建了以下类：

public class QuizletObject
{
    public string response_type { get; set; }
    public int total_results { get; set; }
    public int page { get; set; }
    public int total_pages { get; set; }
    public int sets_with_images { get; set; }
    public Set[] sets { get; set; }
}

public class Set
{
    public int id { get; set; }
    public string title { get; set; }
    public string url { get; set; }
    public string creator { get; set; }
    public int created { get; set; }
    public int term_count { get; set; }
    public bool has_images { get; set; }
    public int last_modified { get; set; }
}

我有一个调用web服务的类和方法，如下所示：

public class Quizlet
{
    private string _baseUrl = "http://api.quizlet.com/1.0/sets";
    private const string DevKey = "my dev key";               

    public QuizletObject GetQuizletSets()
    {
        _baseUrl = _baseUrl + "?dev_key=" + DevKey + "&q=" + "geography";

        RestClient client = new RestClient();
        client.BaseUrl = _baseUrl;

        RestRequest request = new RestRequest(Method.GET);
        request.RequestFormat = DataFormat.Json;

        RestResponse<QuizletObject> response = client.Execute<QuizletObject>(request);

        return response.Data;
    }
}

private string _baseUrl = "http://api.quizlet.com/1.0";
...
request.Resource = "sets?dev_key=" + DevKey + "&q=" + "geography";

堆栈跟踪：

[NullReferenceException: Object reference not set to an instance of an object.]
ASP._Page_Views_Home_Index_cshtml.Execute() in c:\Users\Girish\Documents\Visual Studio 2010\Projects\RestSharpPoC\RestSharpPoC\Views\Home\Index.cshtml:18
System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +207
System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +81
System.Web.WebPages.StartPage.RunPage() +19
System.Web.WebPages.StartPage.ExecutePageHierarchy() +65
System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +76
System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +220
System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +115
System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +303
System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +13
System.Web.Mvc.<>c__DisplayClass1c.<InvokeActionResultWithFilters>b__19() +23
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +260
System.Web.Mvc.<>c__DisplayClass1e.<InvokeActionResultWithFilters>b__1b() +19
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +177
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +343
System.Web.Mvc.Controller.ExecuteCore() +116
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +97
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10
System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +37
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +12
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +50
System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +7
System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +22
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +60
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8963149
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184

[NullReferenceException:对象引用未设置为对象的实例。]
ASP.\u Page\u Views\u Home\u Index\u cshtml.Execute（）中的c:\Users\Girish\Documents\Visual Studio 2010\Projects\RestSharpPoC\RestSharpPoC\Views\Home\Index.cshtml:18
System.Web.WebPages.WebPageBase.ExecutePageHierarchy（）+207
System.Web.Mvc.WebViewPage.ExecutePageHierarchy（）+81
System.Web.WebPages.StartPage.RunPage（）+19
System.Web.WebPages.StartPage.ExecutePageHierarchy（）+65
System.Web.WebPages.WebPageBase.ExecutePageHierarchy（WebPageContext-pageContext、TextWriter-writer、WebPageRenderingBase-startPage）+76
System.Web.Mvc.RazorView.RenderView（ViewContext、TextWriter、Object实例）+220
System.Web.Mvc.buildmanager compiledview.Render（ViewContext、TextWriter）+115
System.Web.Mvc.ViewResultBase.ExecuteResult（ControllerContext上下文）+303
System.Web.Mvc.ControllerActionInvoker.InvokeActionResult（ControllerContext ControllerContext，ActionResult ActionResult）+13
System.Web.Mvc.c__显示Class1C.b__19（）+23
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter（IResultFilter筛选器，ResultExecutingContext预文本，Func`1 continuation）+260
System.Web.Mvc.c__DisplayClass1e.b__1b（）+19
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters（ControllerContext ControllerContext，IList`1过滤器，ActionResult ActionResult）+177
System.Web.Mvc.ControllerActionInvoker.InvokeAction（ControllerContext ControllerContext，String actionName）+343
System.Web.Mvc.Controller.ExecuteCore（）+116
System.Web.Mvc.ControllerBase.Execute（RequestContext-RequestContext）+97
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute（RequestContext RequestContext）+10
System.Web.Mvc.c__显示类b.b__5（）+37
System.Web.Mvc.Async.c__显示类1.b__0（）+21
System.Web.Mvc.Async.c_uuudisplayClass8`1.b_uuu7（IAsyncResult）+12
System.Web.Mvc.Async.WrappedAsyncResult`1.End（）+62
System.Web.Mvc.c_uuudisplayClasse.b_uuud（）+50
System.Web.Mvc.SecurityUtil.b___0（操作f）+7
System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust（操作）+22
System.Web.Mvc.MvcHandler.EndProcessRequest（IAsyncResult asyncResult）+60
System.Web.Mvc.MvcHandler.System.Web.IHTTPassynchandler.EndProcessRequest（IAsyncResult结果）+9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute（）+8963149
System.Web.HttpApplication.ExecuteStep（IExecutionStep步骤，布尔值&同步完成）+184

我也看到过同样的问题。我还没有在RestSharp中找到它，但是我要做的是将json文本返回，然后自己反序列化它

对于您的代码，可能类似于以下内容：

response = client.Execute(request);
var quizletObject = Newtonsoft.Json.JsonConvert.DeserializeObject<QuizletObject>(response.Content);

如果除了“设置”之外还有多个可用的呼叫，我可能会这样设置：

public class Quizlet
{
    private string _baseUrl = "http://api.quizlet.com/1.0/sets";
    private const string DevKey = "my dev key";               

    public QuizletObject GetQuizletSets()
    {
        _baseUrl = _baseUrl + "?dev_key=" + DevKey + "&q=" + "geography";

        RestClient client = new RestClient();
        client.BaseUrl = _baseUrl;

        RestRequest request = new RestRequest(Method.GET);
        request.RequestFormat = DataFormat.Json;

        RestResponse<QuizletObject> response = client.Execute<QuizletObject>(request);

        return response.Data;
    }
}

private string _baseUrl = "http://api.quizlet.com/1.0";
...
request.Resource = "sets?dev_key=" + DevKey + "&q=" + "geography";

---

编辑：只是想到了一些其他的东西-尝试使用列表而不是Set[]，也许RestSharp会更容易处理这个问题。

我也看到了同样的问题。我还没有在RestSharp中找到它，但是我要做的是将json文本返回，然后自己反序列化它

对于您的代码，可能类似于以下内容：

response = client.Execute(request);
var quizletObject = Newtonsoft.Json.JsonConvert.DeserializeObject<QuizletObject>(response.Content);

如果除了“设置”之外还有多个可用的呼叫，我可能会这样设置：

public class Quizlet
{
    private string _baseUrl = "http://api.quizlet.com/1.0/sets";
    private const string DevKey = "my dev key";               

    public QuizletObject GetQuizletSets()
    {
        _baseUrl = _baseUrl + "?dev_key=" + DevKey + "&q=" + "geography";

        RestClient client = new RestClient();
        client.BaseUrl = _baseUrl;

        RestRequest request = new RestRequest(Method.GET);
        request.RequestFormat = DataFormat.Json;

        RestResponse<QuizletObject> response = client.Execute<QuizletObject>(request);

        return response.Data;
    }
}

private string _baseUrl = "http://api.quizlet.com/1.0";
...
request.Resource = "sets?dev_key=" + DevKey + "&q=" + "geography";

编辑：只是想到了一些其他的东西-尝试使用列表而不是Set[]，也许RestSharp会更容易使用它