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  1. C# Driver
  2. CSHARP-4688

Calling queryable.First when queryable is of type IMongoQueryable<T> doesn't add { $limit : 1 } stage to pipeline

    • Type: Icon: Improvement Improvement
    • Resolution: Done
    • Priority: Icon: Unknown Unknown
    • 2.21.0
    • Affects Version/s: None
    • Component/s: LINQ3
    • None
    • Not Needed
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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

      When `queryable` is of type `IMongoQueryable<T>` the compiler resolves the call to `queryable.First()` to the overload found in `IAsyncCursorSourceExtensions` instead of to `Queryable.First`.

      Compiler rules for resolving overloads are rather hard to understand and in this case it resolves to an unexpected overload.

      The effect of this is that the query sent to the server does not have the desired `

      { $limit : 1 }

      ` stage.

      A similar situation exists for many other extension methods in `IAsyncCursorSourceExtensions` that have the same name as extension methods in `Queryable` or `MongoQueryable`.

            Assignee:
            robert@mongodb.com Robert Stam
            Reporter:
            robert@mongodb.com Robert Stam
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              Created:
              Updated:
              Resolved: