自定义反序列化从json对象字符串

Question

我想反序列化这个JSON到一个对象，但我不能达到解决方案。

JSON格式：

{"option1": 
    {"field1":"true","field2":"false"}, 
"option2": 
    {"field1":"true","field2":"false"}} 

我有以下对象：

[Serializable] 
public class genericFieldOptions 
{ 
    public string option { get; set; } 
    public string field { get; set; } 
    public bool value{ get; set; } 
} 

，然后在 “解串器”：

public class genericFieldsConverter : JavaScriptConverter 
{ 
    public override IEnumerable<Type> SupportedTypes 
    { 
     get 
     { 
      return new[] { typeof(genericFieldOptions) }; 
     } 
    } 

    public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer) 
    { 
     List<genericFieldOptions> p = new List<genericFieldOptions>(); 

     foreach (var entry in dictionary.Keys) 
     {    
      try 
      { 
       Dictionary<string, Boolean> test = (Dictionary<string, Boolean>)dictionary[entry];//error 
       p.Add(new genericFieldOptions { key = entry, field1=test["field1"],field2=test["field2"] }); 
      } 
      catch { } 
     } 
     return p; 
    } 

召唤：

JavaScriptSerializer serializer = new JavaScriptSerializer(); 
serializer.RegisterConverters(new JavaScriptConverter[] { new genericFieldsConverter() }); 
var example= serializer.Deserialize<List<genericFieldOptions>>(json); 

如何才能以Dictionary<string, Dictionary<string,boolean>>访问IDictionary<string, object>？还是仅仅是不可能的？

我在做什么错？有没有另一种简单的方法来做到这一点？

Answer 1

简单的方法是正确地创建表示序列化值的对象。因此，对于：

{"option1": 
    {"field1":"true","field2":"false"}, 
"option2": 
    {"field1":"true","field2":"false"}} 

我会做：

public class Options 
{ 
    public Option Option1 { get; set; } 
    public Option Option2 { get; set; } 
} 

public class Option 
{ 
    public bool Field1 { get; set; } 
    public bool Field2 { get; set; } 
} 

对于初学者来说，比较容易的方法之一是使用http://json2csharp.com/。

Answer 2

如上所述，您可以使用Json.NET。如果您不想创建要反序列化的类，则可以按照您的尝试使用字典，也可以使用dynamic。

const string json = "{\"option1\":{\"field1\":true,\"field2\":false}," + 
        "\"option2\":{\"field1\":true,\"field2\":false}}"; 

var result1 = JsonConvert.DeserializeObject<Dictionary<string, Dictionary<string, bool>>>(json); 
Console.WriteLine(result1["option2"]["field1"]); 

dynamic result2 = JsonConvert.DeserializeObject(json); 
Console.WriteLine(result2.option2.field1); 

Answer 3

既然你已经选择使用javascriptserializer，首先你需要在List<genericFieldOptions>不是genericFieldOptions的水平做转换，因为串行器不能自动JSON对象转换为List<T>。

其次，而非铸造的嵌套字典来Dictionary<string, Boolean>，你需要转换为IDictionary<string, object>，然后反序列化使用JavaScriptSerializer.ConvertToType<bool>每个值到bool。因此：

public class genericFieldsListConverter : JavaScriptConverter 
{ 
    public override IEnumerable<Type> SupportedTypes 
    { 
     get 
     { 
      return new[] { typeof(List<genericFieldOptions>) }; 
     } 
    } 

    public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer) 
    { 
     var query = from entry in dictionary 
        let subDictionary = entry.Value.AsJsonObject() 
        where subDictionary != null 
        from subEntry in subDictionary 
        select new genericFieldOptions { option = entry.Key, field = subEntry.Key, value = serializer.ConvertToType<bool>(subEntry.Value) }; 
     return query.ToList(); 
    } 

    public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer) 
    { 
     var list = (IList<genericFieldOptions>)obj; 
     if (list == null) 
      return null; 
     return list 
      .GroupBy(o => o.option) 
      .ToDictionary(g => g.Key, g => (object)g.ToDictionary(o => o.field, o => serializer.Serialize(o.value))); 
    } 
} 

public static class JavaScriptSerializerObjectExtensions 
{ 
    public static bool IsJsonObject(this object obj) 
    { 
     return obj is IDictionary<string, object>; 
    } 

    public static IDictionary<string, object> AsJsonObject(this object obj) 
    { 
     return obj as IDictionary<string, object>; 
    } 
}