Mongo C#驱动程序-使用嵌套动态构建过滤器 [英] Mongo C# driver - Building filter dynamically with nesting

问题描述

假设类似嵌套表达式

其中a = 1 AND(b = 4 OR b = 5)

where a = 1 AND ( b = 4 OR b = 5 )

如何使用多个Builders对象并从此类表达式构建完整的过滤器?

How to use multiple Builders objects and build a complete filter out of such an expression?

推荐答案

Builders是非常灵活的类，它还具有覆盖运算符"& = AND"和" | = OR"

Builders is really flexible class, it also has overridden operators "& = AND" and "| = OR"

您的示例将是

var filter = Builders<User>.Filter.Eq(x => x.A, "1");
filter = filter & (Builders<User>.Filter.Eq(x => x.B, "4") | Builders<User>.Filter.Eq(x => x.B, "5"));

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