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这是我的 JSON 文件，其中包含多个“应用程序”对象：

{"Application":[{"appid":"0","appname":"application0"},
                {"appid":"1","appname":"application1"},
                ....
               ]}

我将它从 Android 代码接收到我的 WCF REST 服务方法中：

[WebInvoke(Method = "POST", UriTemplate = "/AcceptApp", RequestFormat = WebMessageFormat.Json,  
    ResponseFormat = WebMessageFormat.Xml, BodyStyle = WebMessageBodyStyle.WrappedRequest)]
[OperationContract]
string AcceptApplication(Stream jsonstring);

这是方法定义：

public string AcceptApplication(Stream inputStream)
{
    StreamReader r = new StreamReader(inputStream);
    string jsonstring = r.ReadToEnd();
    try
    {
       List<ApplicationEntity> list = JsonConvert.DeserializeObject<List<ApplicationEntity>>(jsonstring);
       for (int i = 0; i < list.Count; i++)
       {
         // using data
       }
    }
    catch (Exception E)
    {
        Logger.Error(E.Message);
    }

我的应用实体：

public class ApplicationEntity
{
    public string appid { get; set; }
    public string appname { get; set; }
}

我得到了 jsonstring ，但是我得到了错误：

Newtonsoft.Json.JsonSerializationException: Cannot deserialize the current JSON object (e.g.    
{"name":"value"}) into type  
'System.Collections.Generic.List`1[ApplicationEntity]' because the  
type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so
that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array 
or List<T>) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type 
to force it to deserialize from a JSON object.
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1 回答 1

2

您尝试解析的 JSON 字符串不是列表或数组。它是一个具有称为"Application"数组的属性的对象。试试这个：

public class ApplicationObject
{
    public List<ApplicationEntity> Application { get; set; }
}
...
var apps = JsonConvert.DeserializeObject<ApplicationObject>(jsonstring);

现在您可以访问 上的列表apps.Application。

于 2012-07-13T03:10:29.263 回答