使用mongodb和c#驱动程序，如何将json反序列化为匿名类型

我需要将字符串反序列化回匿名类型/对象，但我得到:

A document being deserialized to System.Object must be empty.

有办法做到这一点吗?保存文档很好，只是在试图反序列化它时遇到了问题。代码如下:

[TestFixture]
public class ObjectTests
{
    [Test]
    public void Can_Deserialize_To_Object()
    {
        BsonDefaults.GuidRepresentation = GuidRepresentation.CSharpLegacy;
        BsonClassMap.RegisterClassMap<Thing>(x =>
        {
            x.AutoMap();
            x.SetIdMember(x.GetMemberMap(c => c.Id));
        });
        var client = new MongoClient("mongodb://localhost").GetServer().GetDatabase("Test");
        var things = client.GetCollection<Thing>("Things");
        things.Drop();
        var thing = new Thing();
        thing.Data = new
        {
            Text = "This is some text",
            Value = "This is the value"
        };
        things.Insert(thing);
        // System.IO.FileFormatException : An error occurred while deserializing the Data property of class Soma.Core.Tests.Thing: A document being deserialized to System.Object must be empty.
       var result = things.FindOne();
    }
}
public class Thing
{
    public Guid Id { get; set; }
    public object Data { get; set; }
}