如何排除JSON序列化特定类型 [英] How to exclude specific type from json serialization

问题描述

我记录所有请求我的WCF web服务，其中包括的参数，到数据库中。这是我做的方式：

I am logging all requests to my WCF web services, including the arguments, to the database. This is the way I do it:

• 创建一个类WcfMethodEntry从PostSharp的方面OnMethodBoundaryAspect，

派生
• 注释所有WCF方法与WcfMethodEntry属性，


• 在WcfMethodEntry序列化的方法参数JSON与JsonConvert.SerializeObject方法，并将其保存到数据库中。

这工作正常，但有时参数是相当大的，例如一对夫妇有照片，指纹等字节数组，我想自定义类？排除系列化所有的字节数组数据类型，这将是做到这一点的最好办法

This works ok, but sometimes the arguments are quite large, for example a custom class with a couple of byte arrays with photo, fingerprint etc. I would like to exclude all those byte array data types from serialization, what would be the best way to do it?

序列化的JSON的示例：

Example of a serialized json:

[
   {
      "SaveCommand":{
         "Id":5,
         "PersonalData":{
            "GenderId":2,
            "NationalityCode":"DEU",
            "FirstName":"John",
            "LastName":"Doe",
         },
         "BiometricAttachments":[
            {
               "BiometricAttachmentTypeId":1,
               "Parameters":null,
               "Content":"large Base64 encoded string"
            }
         ]
      }
   }
]

所需的输出：

[
   {
      "SaveCommand":{
         "Id":5,
         "PersonalData":{
            "GenderId":2,
            "NationalityCode":"DEU",
            "FirstName":"John",
            "LastName":"Doe",
         },
         "BiometricAttachments":[
            {
               "BiometricAttachmentTypeId":1,
               "Parameters":null,
               "Content":"..."
            }
         ]
      }
   }
]

编辑：我无法更改用作Web服务方法的参数的类 - 这也意味着我不能使用JsonIgnore属性

I can't change the classes that are used as arguments for web service methods - that also means that I cannot use JsonIgnore attribute.

推荐答案

下面，您可以排除要从生成的JSON排除特定的数据类型。它的使用和实施很简单，从底部的链接被改编

The following allows you to exclude a specific data-type that you want excluded from the resulting json. It's quite simple to use and implement and was adapted from the link at the bottom.

您可以使用它作为你不能改变实际的类：

You can use this as you cant alter the actual classes:

public class DynamicContractResolver : DefaultContractResolver
{

    private Type _typeToIgnore;
    public DynamicContractResolver(Type typeToIgnore)
    {
        _typeToIgnore = typeToIgnore;
    }

    protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
    {
        IList<JsonProperty> properties = base.CreateProperties(type, memberSerialization);

        properties = properties.Where(p => p.PropertyType != _typeToIgnore).ToList();

        return properties;
    }
}

用法示例：

Usage and sample:

public class MyClass
{
    public string Name { get; set; }
    public byte[] MyBytes1 { get; set; }
    public byte[] MyBytes2 { get; set; }
}

MyClass m = new MyClass
{
    Name = "Test",
    MyBytes1 = System.Text.Encoding.Default.GetBytes("Test1"),
    MyBytes2 = System.Text.Encoding.Default.GetBytes("Test2")
};



JsonConvert.SerializeObject(m, Formatting.Indented, new JsonSerializerSettings { ContractResolver = new DynamicContractResolver(typeof(byte[])) });

输出：

Output:

{
  "Name": "Test"
}

更多信息可以在这里找到：

More information can be found here:

的减少序列化JSON尺寸

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