是否有方法将JSON内容反序列化为c#动态类型?为了使用DataContractJsonSerializer，最好跳过创建一堆类。
当前回答
我来这里是为了找到。net Core的答案，没有任何第三方或其他参考。如果您将ExpandoObject与标准JsonSerializer类一起使用，那么它工作得很好。下面是一个对我有用的例子:
using System.Text.Json;
using System.Dynamic;
dynamic json = JsonSerializer.Deserialize<ExpandoObject>(jsonText);
Console.WriteLine(json.name);
这段代码输出一个name属性的字符串值，该属性存在于传递给Deserialize方法的JSON文本中。瞧——没有额外的库，什么都没有。只是。net核心。
编辑:有嵌套元素的json的几个级别可能会有问题。适用于单层平面对象。
其他回答
你可以使用System.Web.Helpers.Json——它的Decode方法返回一个动态对象，你可以随意遍历它。
它包含在System.Web.Helpers程序集中(。NET 4.0)。
var dynamicObject = Json.Decode(jsonString);
如果你喜欢依赖System.Web.Helpers程序集，那么你可以使用Json类:
dynamic data = Json.Decode(json);
它作为。net 4框架的附加下载包含在MVC框架中。如果有用的话，一定要给弗拉德点赞!但是，如果您不能假定客户机环境包含这个DLL，那么请继续阅读。
这里建议使用另一种反序列化方法。我稍微修改了代码，以修复一个错误，并适合我的编码风格。所有你需要的是这段代码和从你的项目中引用System.Web.Extensions:
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Dynamic;
using System.Linq;
using System.Text;
using System.Web.Script.Serialization;
public sealed class DynamicJsonConverter : JavaScriptConverter
{
public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer)
{
if (dictionary == null)
throw new ArgumentNullException("dictionary");
return type == typeof(object) ? new DynamicJsonObject(dictionary) : null;
}
public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
{
throw new NotImplementedException();
}
public override IEnumerable<Type> SupportedTypes
{
get { return new ReadOnlyCollection<Type>(new List<Type>(new[] { typeof(object) })); }
}
#region Nested type: DynamicJsonObject
private sealed class DynamicJsonObject : DynamicObject
{
private readonly IDictionary<string, object> _dictionary;
public DynamicJsonObject(IDictionary<string, object> dictionary)
{
if (dictionary == null)
throw new ArgumentNullException("dictionary");
_dictionary = dictionary;
}
public override string ToString()
{
var sb = new StringBuilder("{");
ToString(sb);
return sb.ToString();
}
private void ToString(StringBuilder sb)
{
var firstInDictionary = true;
foreach (var pair in _dictionary)
{
if (!firstInDictionary)
sb.Append(",");
firstInDictionary = false;
var value = pair.Value;
var name = pair.Key;
if (value is string)
{
sb.AppendFormat("{0}:\"{1}\"", name, value);
}
else if (value is IDictionary<string, object>)
{
new DynamicJsonObject((IDictionary<string, object>)value).ToString(sb);
}
else if (value is ArrayList)
{
sb.Append(name + ":[");
var firstInArray = true;
foreach (var arrayValue in (ArrayList)value)
{
if (!firstInArray)
sb.Append(",");
firstInArray = false;
if (arrayValue is IDictionary<string, object>)
new DynamicJsonObject((IDictionary<string, object>)arrayValue).ToString(sb);
else if (arrayValue is string)
sb.AppendFormat("\"{0}\"", arrayValue);
else
sb.AppendFormat("{0}", arrayValue);
}
sb.Append("]");
}
else
{
sb.AppendFormat("{0}:{1}", name, value);
}
}
sb.Append("}");
}
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
if (!_dictionary.TryGetValue(binder.Name, out result))
{
// return null to avoid exception. caller can check for null this way...
result = null;
return true;
}
result = WrapResultObject(result);
return true;
}
public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result)
{
if (indexes.Length == 1 && indexes[0] != null)
{
if (!_dictionary.TryGetValue(indexes[0].ToString(), out result))
{
// return null to avoid exception. caller can check for null this way...
result = null;
return true;
}
result = WrapResultObject(result);
return true;
}
return base.TryGetIndex(binder, indexes, out result);
}
private static object WrapResultObject(object result)
{
var dictionary = result as IDictionary<string, object>;
if (dictionary != null)
return new DynamicJsonObject(dictionary);
var arrayList = result as ArrayList;
if (arrayList != null && arrayList.Count > 0)
{
return arrayList[0] is IDictionary<string, object>
? new List<object>(arrayList.Cast<IDictionary<string, object>>().Select(x => new DynamicJsonObject(x)))
: new List<object>(arrayList.Cast<object>());
}
return result;
}
}
#endregion
}
你可以这样使用它:
string json = ...;
var serializer = new JavaScriptSerializer();
serializer.RegisterConverters(new[] { new DynamicJsonConverter() });
dynamic obj = serializer.Deserialize(json, typeof(object));
给定一个JSON字符串:
{
"Items":[
{ "Name":"Apple", "Price":12.3 },
{ "Name":"Grape", "Price":3.21 }
],
"Date":"21/11/2010"
}
下面的代码将在运行时工作:
dynamic data = serializer.Deserialize(json, typeof(object));
data.Date; // "21/11/2010"
data.Items.Count; // 2
data.Items[0].Name; // "Apple"
data.Items[0].Price; // 12.3 (as a decimal)
data.Items[1].Name; // "Grape"
data.Items[1].Price; // 3.21 (as a decimal)
我需要的是返回一个带有不同字段的json模型。 我的模型是这样的，但它可以改变。
{
"employees":
[
{ "name": "Darth", "surname": "Vader", "age": "27", "department": "finance"},
{ "name": "Luke", "surname": "Skywalker", "age": "25", "department": "IT"},
{ "name": "Han", "surname": "Solo", "age": "26", "department": "credit"}
]
}
获取数据值的列表
JObject array = JObject.Parse(model.JsonData);
var tableData = new List<JsonDynamicModel>();
foreach (var objx in array.Descendants().OfType<JProperty>().Where(p => p.Value.Type != JTokenType.Array && p.Value.Type != JTokenType.Object))
{
var name = ((JValue)objx.Name).Value;
var value = ((JValue)objx.Value).Value;
if (tableData.FirstOrDefault(x => x.ColumnName == name.ToString()) == null)
{
tableData.Add(new JsonDynamicModel
{
ColumnName = name.ToString(),
Values = new List<string> { value.ToString() },
});
}
else
{
tableData.FirstOrDefault(x=>x.ColumnName == name.ToString()).Values.Add(value.ToString());
}
}
输出如下所示。然后我把结果模型转换成一个html表，我用这个方法创建了一个html表
// output
tableData[0].ColumnName -> "name";
tableData[0].Values -> {"Darth", "Luke", "Han" }
tableData[1].ColumnName -> "surname";
tableData[1].Values -> {"Vader", "Skywalker", "Solo" }
...
我在我的代码中使用这样的代码，它工作得很好
using System.Web.Script.Serialization;
JavaScriptSerializer oJS = new JavaScriptSerializer();
RootObject oRootObject = new RootObject();
oRootObject = oJS.Deserialize<RootObject>(Your JSon String);
试试这个:
var units = new { Name = "Phone", Color= "White" };
var jsonResponse = JsonConvert.DeserializeAnonymousType(json, units);
