我有一个简单的JSON键/值列表,通过POST发送回ASP.NET。例子:

{ "key1": "value1", "key2": "value2"}

我没有试图反序列化为强类型的.NET对象

我只需要一个普通的旧字典(Of String,String),或者一些等价的东西(哈希表,字典(OfString,Object),老式的StringDictionary——见鬼,一个二维字符串数组对我来说很有用。

我可以使用ASP.NET 3.5中可用的任何东西,也可以使用流行的Json.NET(我已经在使用它对客户端进行序列化)。

显然,这两个JSON库都没有这种开箱即用的能力——它们完全专注于通过强契约实现基于反射的反序列化。

有什么想法吗?

限制:

我不想实现我自己的JSON解析器尚无法使用ASP.NET 4.0希望远离旧的、不推荐使用的JSON ASP.NET类


当前回答

尝试不使用任何外部JSON实现,所以我这样取消了序列化:

string json = "{\"id\":\"13\", \"value\": true}";

var serializer = new JavaScriptSerializer(); //using System.Web.Script.Serialization;

Dictionary<string, string> values = serializer.Deserialize<Dictionary<string, string>>(json);

其他回答

对于任何试图将JSON转换为字典只是为了从中检索一些值的人来说

using Newtonsoft.Json.Linq
...

JObject o = JObject.Parse(@"{
  'CPU': 'Intel',
  'Drives': [
    'DVD read/writer',
    '500 gigabyte hard drive'
  ]
}");

string cpu = (string)o["CPU"];
// Intel

string firstDrive = (string)o["Drives"][0];
// DVD read/writer

IList<string> allDrives = o["Drives"].Select(t => (string)t).ToList();
// DVD read/writer
// 500 gigabyte hard drive

游戏开始得有点晚了,但上面的解决方案中没有一个给我指明了一个纯粹而简单的.NET,而不是json.NET解决方案的方向。这就是,最后变得非常简单。下面是一个完整的运行示例,说明如何使用标准.NETJson序列化,该示例在根对象和子对象中都有字典。

关键是这只猫,将设置解析为序列化程序的第二个参数:

DataContractJsonSerializerSettings settings =
                       new DataContractJsonSerializerSettings();
                    settings.UseSimpleDictionaryFormat = true;

完整代码如下:

using System;
using System.Collections.Generic;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;

    namespace Kipon.dk
    {
        public class JsonTest
        {
            public const string EXAMPLE = @"{
                ""id"": ""some id"",
                ""children"": {
                ""f1"": {
                    ""name"": ""name 1"",
                    ""subs"": {
                    ""1"": { ""name"": ""first sub"" },
                    ""2"": { ""name"": ""second sub"" }
                    }
                },
                ""f2"": {
                    ""name"": ""name 2"",
                    ""subs"": {
                    ""37"": { ""name"":  ""is 37 in key""}
                    }
                }
                }
            }
            ";

            [DataContract]
            public class Root
            {
                [DataMember(Name ="id")]
                public string Id { get; set; }

                [DataMember(Name = "children")]
                public Dictionary<string,Child> Children { get; set; }
            }

            [DataContract]
            public class Child
            {
                [DataMember(Name = "name")]
                public string Name { get; set; }

                [DataMember(Name = "subs")]
                public Dictionary<int, Sub> Subs { get; set; }
            }

            [DataContract]
            public class Sub
            {
                [DataMember(Name = "name")]
                public string Name { get; set; }
            }

            public static void Test()
            {
                var array = System.Text.Encoding.UTF8.GetBytes(EXAMPLE);
                using (var mem = new System.IO.MemoryStream(array))
                {
                    mem.Seek(0, System.IO.SeekOrigin.Begin);
                    DataContractJsonSerializerSettings settings =
                       new DataContractJsonSerializerSettings();
                    settings.UseSimpleDictionaryFormat = true;

                    var ser = new DataContractJsonSerializer(typeof(Root), settings);
                    var data = (Root)ser.ReadObject(mem);
                    Console.WriteLine(data.Id);
                    foreach (var childKey in data.Children.Keys)
                    {
                        var child = data.Children[childKey];
                        Console.WriteLine(" Child: " + childKey + " " + child.Name);
                        foreach (var subKey in child.Subs.Keys)
                        {
                            var sub = child.Subs[subKey];
                            Console.WriteLine("   Sub: " + subKey + " " + sub.Name);
                        }
                    }
                }
            }
        }
    }

这是我使用System.Text.Json的解决方案。您可以获得嵌套对象的Json字符串,然后可以将其转换为所需类型。

public static Dictionary<string,string> JsonToDictionary(this string json)
        {
            var objectValues = JsonSerializer.Deserialize<Dictionary<string, object>>(json);
            var stringValues = objectValues.Select(o => new KeyValuePair<string, string>(o.Key, o.Value?.ToString()));
            return stringValues.ToDictionary(pair => pair.Key, pair => pair.Value);
        }

以下是从嵌套对象获取值的用法示例:

 var result= json.JsonToDictionary()["outerField"]
                .JsonToDictionary()["innerField"];

请注意,此解决方案不包括以数组形式开始的json对象,如[12,13]。这些对象可以在开头作为数组读取,然后可以在每个项上应用扩展方法,以防这些项是具有自己财产的复杂对象。

编辑:这是可行的,但使用Json.NET的公认答案要简单得多。留下这个,以防有人只需要BCL代码。

现成的.NET框架不支持它。一个明显的疏忽——并不是每个人都需要反序列化为具有命名财产的对象。所以,我最终推出了自己的:

VB.NET:

<Serializable()> Public Class StringStringDictionary
    Implements ISerializable
    Public dict As System.Collections.Generic.Dictionary(Of String, String)
    Public Sub New()
        dict = New System.Collections.Generic.Dictionary(Of String, String)
    End Sub
    Protected Sub New(info As SerializationInfo, _
          context As StreamingContext)
        dict = New System.Collections.Generic.Dictionary(Of String, String)
        For Each entry As SerializationEntry In info
            dict.Add(entry.Name, DirectCast(entry.Value, String))
        Next
    End Sub
    Public Sub GetObjectData(info As SerializationInfo, context As StreamingContext) Implements ISerializable.GetObjectData
        For Each key As String in dict.Keys
            info.AddValue(key, dict.Item(key))
        Next
    End Sub
End Class

与C#相同:

public class StringStringDictionary : ISerializable
{
    public System.Collections.Generic.Dictionary<string, string> dict;
    public StringStringDictionary()
    {
        dict = new System.Collections.Generic.Dictionary<string, string>();
    }
    protected StringStringDictionary(SerializationInfo info, StreamingContext context)
    {
        dict = new System.Collections.Generic.Dictionary<string, string>();
        foreach (SerializationEntry entry in info)
            dict.Add(entry.Name, (string)entry.Value);
    }
    public void GetObjectData(SerializationInfo info, StreamingContext context)
    {
        foreach (string key in dict.Keys)
            info.AddValue(key, dict[key]);
    }
}

调用方式:

string MyJsonString = "{ \"key1\": \"value1\", \"key2\": \"value2\"}";
System.Runtime.Serialization.Json.DataContractJsonSerializer dcjs = new
  System.Runtime.Serialization.Json.DataContractJsonSerializer(
    typeof(StringStringDictionary));
System.IO.MemoryStream ms = new
  System.IO.MemoryStream(Encoding.UTF8.GetBytes(MyJsonString));
StringStringDictionary myfields = (StringStringDictionary)dcjs.ReadObject(ms);
Response.Write("Value of key2: " + myfields.dict["key2"]);

很抱歉,C#和VB.NET混合使用…

尝试不使用任何外部JSON实现,所以我这样取消了序列化:

string json = "{\"id\":\"13\", \"value\": true}";

var serializer = new JavaScriptSerializer(); //using System.Web.Script.Serialization;

Dictionary<string, string> values = serializer.Deserialize<Dictionary<string, string>>(json);