DataContractJsonSerializer跳过空值节点 [英] DataContractJsonSerializer to skip nodes with null values

问题描述

我使用 DataContractJsonSerializer 连载我的自定义对象JSON。但我想跳过数据成员的值空。如果数据成员是空节点不应该进来的JSON字符串。

I am using DataContractJsonSerializer to serialize my custom object to JSON. But i want to skip the data members whose values are null. If DataMember is null that node should not come in JSON string.

我怎样才能做到这一点？给我一个简单的代码段的工作。

How can I achieve this? Give me a simple code snippet to work with.

推荐答案

可以使用在 [数据成员] 属性 EmitDefaultValue = FALSE 属性。会员标有该属性，它们的值将不会输出。

You can use the EmitDefaultValue = false property in the [DataMember] attribute. For members marked with that attribute, their values will not be output.

[DataContract]
public class MyType
{
    [DataMember(EmitDefaultValue = false)]
    public string Prop1 { get; set; }
    [DataMember(EmitDefaultValue = false)]
    public string Prop2 { get; set; }
    [DataMember(EmitDefaultValue = false)]
    public string Prop3 { get; set; }
}
public class Test
{
    public static void Main()
    {
        var dcjs = new DataContractJsonSerializer(typeof(MyType));
        var ms = new MemoryStream();
        var data = new MyType { Prop2 = "Hello" };
        dcjs.WriteObject(ms, data);

        // This will write {"Prop2":"Hello"}
        Console.WriteLine(Encoding.UTF8.GetString(ms.ToArray()));
    }
}

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