How to link multiple Query Operations in MongoDb C# Driver

Question

I'm trying to create a complex query expression with the MongoDb C# driver. So far I've mostly relied on the LINQ .AsQueryable() features which work great, but now I need to run some update operations and it looks like I need to use the QueryBuilder for that.

However, I can't figure out how to create a complex query that strings multiple query operators together.

I'd like to do something like this:

var query = Query<QueueMessageItem>
            .EQ( qi => qi.Type, queueName)
            .EQ("Started", null);

but apparently this doesn't work because .EQ() and all the other query operators don't return a chainable Query object.

How do I use Queries and add multiple search operators?

Have you tried nesting them (Query.Or(Query.EQ("t", "F"), Query.EQ("t", "M")))? — Ben Allred
– Ben Allred, Commented Feb 27, 2014 at 20:15
Nope - and I missed it because Query<T> doesn't have it. Yes that'll work, but shame that the driver can't chain which would be way more natural. — Rick Strahl
– Rick Strahl, Commented Feb 27, 2014 at 20:18

Ben Allred · Accepted Answer · 2014-02-27 20:19:50Z

2

You need to nest the query operators. Something like this

Query.Or(Query.EQ("t", "F"), Query.EQ("t", "M"))

answered Feb 27, 2014 at 20:19

Ben Allred

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