MongoDB未知鉴别符值=>反序列化为JSonDocument [英] MongoDB Unknown discriminator value => deserialize to JSonDocument

问题描述

在MongoDB中，我有一个类，其属性为MyProperty，类型为object.

In MongoDB I've a class with a property MyProperty of type object.

public MyClass
{
    public object MyProperty;
    public string Prop1;
    public DateTime Prop2;
    public int Prop3;
}

对MongoDB的序列化可以毫无问题地创建这种类型的JSon:

Serialization to MongoDB works without any problem creating a JSon of this type:

MyProperty" : {
                "_t" : "ExampleClass",
            [...]
}

但是当我尝试对其进行序列化时，会出现以下错误:

But when I try do seserialize it I get the following error:

反序列化类的MyProperty属性时发生错误 我的课: 未知的鉴别符值'ExampleClass'.

An error occurred while deserializing the MyProperty property of class MyClass: Unknown discriminator value 'ExampleClass'.

我想将MyProperty反序列化为简单的通用BsonDocument或字符串.

I'd like to deserialize MyProperty to a simple generic BsonDocument or to a string.

推荐答案

_t存储您的自定义类名称.您将需要注册此自定义类映射，以使mongo知道在反序列化时要使用哪个对象.这是一个代码示例(只需要在应用程序的开头调用一次):

The _t stores your custom class name. You will need to register this custom class mapping in order for mongo to know which object to use when deserializing. Here is a code example (should only need to call this once at the beginning of your application):

if (!BsonClassMap.IsClassMapRegistered(typeof(ExampleClass)))
{
   BsonClassMap.RegisterClassMap<ExampleClass>();
}

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