In example 2 on GetItemLinqQueryable I believe the FeedIterator lacks the generic parameter for type, as it does not compile for me. This Using Linq example on another Microsoft page includes the type. So the solution can simply be to copy the code from the second link to the first link.

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• ID: 0207c888-39da-2768-71b5-2fc219f5ebad
• Version Independent ID: 4ed5c6d6-170d-50a5-7ac2-e8e64bd7d0f6
• Content: Container.GetItemLinqQueryable<T>(Boolean, String, QueryRequestOptions, CosmosLinqSerializerOptions) Method (Microsoft.Azure.Cosmos) - Azure for .NET Developers
• Content Source: xml/Microsoft.Azure.Cosmos/Container.xml
• Service: cosmos-db
• GitHub Login: @rloutlaw
• Microsoft Alias: routlaw