C# 如何使用Json.Net将JsonProperty属性分配给DLL内类的属性？

我在DLL中有一个类，它没有标记为

DataContract、JsonProperty

等。现在我想将该类的实例序列化为JSON对象，，并缩短C#property名称

例如，该类是：

public class Foo
{
    public string SomeLengthyCSharpPropertyName { get; set; }
}

我想知道是否可以在C#名称和json名称之间创建映射。我不能像下面那样直接添加

DataContract、JsonProperty

属性。有什么解决办法吗

---

我不想用相同的代码创建另一个类，但是<代码> jsNaveS/<代码>修饰的属性并将属性复制到新的类，然后序列化。

它感觉像是一个解决方案，但您可能想考虑一下。如果未密封该类，则可以从该类继承、重写其属性（您要更改的属性），然后对其进行修饰。

您可以通过成员的重写属性字典进行自定义，然后重写并将重写应用于基类返回的：

public class JsonPropertyOverride
{
    public string PropertyName { get; set; }

    public bool? Ignored { get; set; }

    // Others as required from http://www.newtonsoft.com/json/help/html/T_Newtonsoft_Json_JsonPropertyAttribute.htm
    // Changing all value type properties to nullables.
}

public class OverrideContractResolver : DefaultContractResolver
{
    readonly Dictionary<MemberInfo, JsonPropertyOverride> overrides; // A private copy for thread safety.

    public OverrideContractResolver(IDictionary<MemberInfo, JsonPropertyOverride> overrides)
        : base()
    {
        if (overrides == null)
            throw new ArgumentNullException();
        this.overrides = overrides.ToDictionary(p => p.Key, p => p.Value);
    }

    protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
    {
        var property = base.CreateProperty(member, memberSerialization);
        if (property != null)
        {
            JsonPropertyOverride attr;
            if (overrides.TryGetValue(member, out attr))
            {
                if (attr.PropertyName != null)
                    property.PropertyName = ResolvePropertyName(attr.PropertyName);
                if (attr.Ignored != null)
                    property.Ignored = attr.Ignored.Value;
            }
        }
        return property;
    }
}

---

您是否尝试使用Newtonsoft.Json库？使用此库，您可以序列化和反序列化，而无需decorators@qjuanp我想我们谈论的是同一个图书馆？如果没有装饰师，我如何缩短属性名称？对不起，我错过了那个特别的细节。只需使用和@qjuanp：在评论之前，你真的需要阅读整个问题并理解它。

public class JsonPropertyOverride
{
    public string PropertyName { get; set; }

    public bool? Ignored { get; set; }

    // Others as required from http://www.newtonsoft.com/json/help/html/T_Newtonsoft_Json_JsonPropertyAttribute.htm
    // Changing all value type properties to nullables.
}

public class OverrideContractResolver : DefaultContractResolver
{
    readonly Dictionary<MemberInfo, JsonPropertyOverride> overrides; // A private copy for thread safety.

    public OverrideContractResolver(IDictionary<MemberInfo, JsonPropertyOverride> overrides)
        : base()
    {
        if (overrides == null)
            throw new ArgumentNullException();
        this.overrides = overrides.ToDictionary(p => p.Key, p => p.Value);
    }

    protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
    {
        var property = base.CreateProperty(member, memberSerialization);
        if (property != null)
        {
            JsonPropertyOverride attr;
            if (overrides.TryGetValue(member, out attr))
            {
                if (attr.PropertyName != null)
                    property.PropertyName = ResolvePropertyName(attr.PropertyName);
                if (attr.Ignored != null)
                    property.Ignored = attr.Ignored.Value;
            }
        }
        return property;
    }
}

public class Foo
{
    public string SomeLengthyCSharpPropertyName { get; set; }

    public string DefaultNotIgnored { get; set; }

    [JsonIgnore]
    public string DefaultIgnored { get; set; }
}

public class TestClass
{
    public static void Test()
    {
        var foo = new Foo { SomeLengthyCSharpPropertyName = "SomeLengthyCSharpPropertyName", DefaultIgnored = "DefaultIgnored", DefaultNotIgnored = "DefaultNotIgnored" };

        var resolver = new OverrideContractResolver(new Dictionary<MemberInfo, JsonPropertyOverride> { 
            { typeof(Foo).GetProperty("SomeLengthyCSharpPropertyName"), new JsonPropertyOverride { PropertyName = "c"  } }, 
            { typeof(Foo).GetProperty("DefaultNotIgnored"), new JsonPropertyOverride { Ignored = true  } }, 
            { typeof(Foo).GetProperty("DefaultIgnored"), new JsonPropertyOverride { Ignored = false  } }, 
        });
        var settings = new JsonSerializerSettings { ContractResolver = resolver };

        var json = JsonConvert.SerializeObject(foo, settings); // Outputs {"c":"SomeLengthyCSharpPropertyName","DefaultIgnored":"DefaultIgnored"}
        Debug.WriteLine(json);

        var expectedJson = @"{ ""c"": ""SomeLengthyCSharpPropertyName"", ""DefaultIgnored"": ""DefaultIgnored"" }";
        var ok = JToken.DeepEquals(JToken.Parse(json), JToken.Parse(expectedJson));
        Debug.Assert(ok); // No assert

        var foo2 = JsonConvert.DeserializeObject<Foo>(json, settings);

        var ok2 = foo2.DefaultIgnored == foo.DefaultIgnored && foo2.SomeLengthyCSharpPropertyName == foo.SomeLengthyCSharpPropertyName;
        Debug.Assert(ok2); // No assert
    }
}