不能隐式转换'Newtonsoft.Json.Linq.JObject'

本文关键字:Json Linq JObject Newtonsoft 不能 转换 | 更新日期: 2023-09-27 18:09:26

我需要返回一个json对象,但我得到以下错误:

错误1无法隐式转换类型"Newtonsoft.Json.Linq.JObject"来"System.Collections.Generic.IEnumerable<Newtonsoft.Json.Linq.JObject&gt"。存在显式转换(您是否缺少强制类型转换?)>

谁能帮我解决这个错误?

public static IEnumerable<JObject> GetListOfHotels()
{
    const string dataPath = "https://api.eancdn.com/ean-services/rs/hotel/v3/list?minorRev=99&cid=55505&apiKey=key&customerUserAgent=Google&customerIpAddress=123.456&locale=en_US&currencyCode=USD&destinationString=washington,united+kingdom&supplierCacheTolerance=MED&arrivalDate=12/12/2013&departureDate=12/15/2013&room1=2&mberOfResults=1&supplierCacheTolerance=MED_ENHANCED";
    var request           = WebRequest.Create(dataPath);
    request.Method        = "POST";
    const string postData = dataPath;
    var byteArray         = Encoding.UTF8.GetBytes(postData);
    request.ContentType    = "application/json";
    request.ContentLength  = byteArray.Length;
    var dataStream = request.GetRequestStream();
    dataStream.Write(byteArray, 0, byteArray.Length);
    dataStream.Close();
    var response = request.GetResponse();
    var responseCode = (((HttpWebResponse) response).StatusDescription);
    var responseStream = response.GetResponseStream();
    var responseReader = new StreamReader(responseStream, Encoding.UTF8);
    var responseString = responseReader.ReadToEnd();
    var root = JObject.Parse(responseString);
    return root;
}

不能隐式转换'Newtonsoft.Json.Linq.JObject'

问题是您试图返回JObject,但由于函数的当前签名,编译器假定它需要返回IEnumerable<JObject>

因此,您需要更改函数的签名,而不是期望IEnumerable<JObject>:

public static IEnumerable<JObject> GetListOfHotels()

接受JObject代替:

public static JObject GetListOfHotels()

当使用Ext.Direct客户端代理从Sencha ExtJS 4数据存储调用。net服务器端堆栈的Ext.Direct时,我也有同样的异常。此服务器端堆栈引用Newtonsoft.Json.dll . net程序集(。NET 4.0)。当我的Ext.Direct存储抛出此异常时,它正在存储中的sorters和groupers属性中传递嵌套对象。我通过在花括号周围添加方括号来修复它。如果你想知道为什么,你可以在这里下载这个框架:https://code.google.com/p/extdirect4dotnet/.

Old(抛出异常):

Ext.define('MyApp.store.Hierarchy', {
    extend : 'Ext.data.Store',
    model : 'R.model.Hierarchy',
    sorters: { 
        property: 'namespace_id',
        direction: 'ASC' 
    },
    remoteSort: true,
    groupers: {
        property: 'namespace_id',
        direction: 'ASC'
    },
    remoteGroup: true,
    proxy: {        
        type: 'direct',
        directFn: Tree_CRUD.read,
        reader: {
            root: 'data'
        }
    }
});

新增(包含括号修复):

Ext.define('MyApp.store.Hierarchy', {
    extend : 'Ext.data.Store',
    model : 'R.model.Hierarchy',
    sorters: [{ 
        property: 'namespace_id',
        direction: 'ASC' 
    }],
    remoteSort: true,
    groupers: [{
        property: 'namespace_id',
        direction: 'ASC'
    }],
    remoteGroup: true,3
    proxy: {        
        type: 'direct',
        directFn: Tree_CRUD.read,
        reader: {
            root: 'data'
        }
    }
});