假设我有以下课程 -
public class A
{
public int P1 { get; internal set; }
}
使用json.net,我可以使用P1属性序列化类型。但是,在反序列化期间,未设置P1。如果不修改A类,是否有一种构建方式来处理这个问题?就我而言,我使用的是来自不同程序集的类,无法对其进行修改。
答案 0 :(得分:5)
是的,您可以使用自定义ContractResolver
使内部属性可写入Json.Net。以下是您需要的代码:
class CustomResolver : DefaultContractResolver
{
protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
{
JsonProperty prop = base.CreateProperty(member, memberSerialization);
if (member.DeclaringType == typeof(A) && prop.PropertyName == "P1")
{
prop.Writable = true;
}
return prop;
}
}
要使用解析程序,请创建JsonSerializerSettings
的实例,并将其ContractResolver
属性设置为自定义解析程序的新实例。然后,将设置传递给JsonConvert.DeserializeObject<T>()
。
演示:
class Program
{
static void Main(string[] args)
{
string json = @"{ ""P1"" : ""42"" }";
JsonSerializerSettings settings = new JsonSerializerSettings();
settings.ContractResolver = new CustomResolver();
A a = JsonConvert.DeserializeObject<A>(json, settings);
Console.WriteLine(a.P1);
}
}
输出:
42
答案 1 :(得分:1)
经过一些实验,我发现如果用以下材料装饰你的房产,房产会被正确反序列化:
[JsonProperty(DefaultValueHandling = DefaultValueHandling.Include)]
在原始问题中申请课程:
public class A
{
[JsonProperty(DefaultValueHandling = DefaultValueHandling.Include)]
public int P1 { get; internal set; }
}
答案 2 :(得分:0)
这是我在更一般情况下处理的解决方案:
class CustomResolver : DefaultContractResolver
{
protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
{
JsonProperty result = base.CreateProperty(member, memberSerialization);
var propInfo = member as PropertyInfo;
result.Writable |= propInfo != null
&& propInfo.CanWrite
&& !propInfo.IsPrivate;
return result;
}
}
使用CInternalSetter类:
class CInternalSetter
{
public CInternalSetter()
{
LoggedEmployeeId3 = 10;
}
public int LoggedEmployeeId { get; set; }
public int LoggedEmployeeId2 { get; internal set; }
public int LoggedEmployeeId3 { get; }
public override string ToString()
{
return JsonConvert.SerializeObject(this, Formatting.Indented);
}
}
然后针对这个类进行测试:
JsonSerializerSettings settings = new JsonSerializerSettings();
settings.ContractResolver = new CustomResolver();
var c = new CInternalSetter()
{
LoggedEmployeeId = 1,
LoggedEmployeeId2 = 2
};
var cString = JsonConvert.SerializeObject(c);
Console.WriteLine(cString);
Console.WriteLine(JsonConvert.DeserializeObject<CInternalSetter>(cString).ToString());
Console.WriteLine("-------------------------------------------");
Console.WriteLine(JsonConvert.DeserializeObject<CInternalSetter>(cString, settings).ToString());