如何使用MongoDB C#驱动程序更新泛型类型 [英] How to update a generic type with MongoDB C# driver

问题描述

我有一个MongoDB帮助程序类，该类接受通用类型以简化CRUD操作.但是，在确定更新方法时遇到了一些麻烦.从我阅读的所有内容来看，似乎我需要单独更新每个字段.

I have a MongoDB helper class, which accepts generic types to simplify CRUD operations. I'm having some trouble figuring out the update method, however. From everything I've read, it seems that I need to individually update each field.

例如:Update.Set("Field", "New Value").Set("Other field", "Other value");

但是我想做的是这样的:

But what I'd like to do is something like this:

void Update(T entity)
{
    collection.Update<T>(entity);
}

这可能吗?还是我需要在特定于该实体的每个实体的类中包括一个update方法?

Is this possible? Or will I need to include an update method in each entity's class specific to that entity?

推荐答案

假定您要更新(替换)整个对象，请执行以下操作:

Assuming that you want to update (replace) the entire object, do this:

void Update(T entity)
{
    collection.Save<T>(entity);
}

它将检测是否设置了_id字段并保存正确的项目.

It will detect if the _id field is set and save the correct item.

如果您的对象包含主键属性(应该)，则可以使用该属性装饰对象，以向Mongo提示

If your object includes a primary key property (it should), you can decorate it with the attribute to give Mongo a hint

[BsonId()]

如果仅查看某些字段，则可以始终使用反射来遍历类型的属性，并将其添加到Update的设置器中.

If you are looking at only updating certain fields, then you could always use reflection to loop through the properties of the type and add them to the Update's setters.

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