BsonElement属性和MongoDB C#驱动程序的自定义反序列化逻辑 [英] BsonElement attribute and custom deserialization logic with MongoDB C# driver

问题描述

请考虑以下示例:

    public class Foo
    {
        private string _text;

        [BsonElement("text"), BsonRequired]
        public string Text
        {
            get { return _text; }
            set
            {
                _text = value;
                Bar(_text);
            }
        }

        private void Bar(string text)
        {
            //Only relevant when Text is set by the user of the class,
            //not during deserialization
        }
    }

Text属性的设置器，以及随后的Bar方法，在类的用户为属性分配新值时以及在MongoDB C#驱动程序反序列化对象期间均被调用.我需要确保仅当用户设置了Text属性时才调用Bar，而不是在反序列化期间调用.

The setter of the Text property and, subsequently, the method Bar are called both when the user of the class assigns a new value to the property and during object deserialization by the MongoDB C# driver. What I need is to ensure that Bar is called only when the Text property is set by the user and not during deserialization.

我看到了两种不太适合我的解决方案:

I see two solutions which don't really suit me:

第一个是将BsonElement属性移动到后备字段.但是，据我所知，MongoDB C#驱动程序在查询构建中使用了BsonElement属性，因此我将失去在查询中使用Text属性的能力.

The first is to move the BsonElement attribute to the backing field. However, as far as I know, the BsonElement attribute is used in query building by the MongoDB C# driver, so I will lose the ability to use the Text property in queries.

第二种解决方案是将Text设置器设为私有，并添加一个方法，该类的用户将通过该方法设置Text属性，并在其中调用Bar方法.但是，在现有解决方案中经常使用Text设置器，我有点不愿意在所有文件中更改70个以上的调用.另外，代码的可读性也会降低.

The second solution is to make the Text setter private and add a method through which the user of the class will set the Text property, and in which the Bar method would be called. However, the Text setter is used very often in the existing solution, and I'm a bit reluctant to change 70+ calls across all files. Plus, the code will become less readable.

在保留属性上的BsonElement属性的同时，有没有更干净的方法来分离反序列化和用户提示的属性更改?

Is there any cleaner way to separate deserialization and user-prompted property change while retaining the BsonElement attribute on the property?

推荐答案

为什么不为用户和数据库为同一私有变量创建单独的属性，就像这样，

Why not create a seperate property for the users and for the DB for the same private variable, something like this,

public class Foo
{
    private string _text;

    [BsonElement("text"), BsonRequired]
    public string TextDB
    {
        get { return _text; }
        set
        {
            _text = value;
        }
    }

    [BsonIgnore]
    public string Text
    {
        get { return _text; }
        set
        {
            _text = value;
            Bar(_text);
        }
    }

    private void Bar(string text)
    {
        //Only relevant when Text is set by the user of the class,
        //not during deserialization
    }
}

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