Lucene.Net.Linq is a .net library that enables LINQ queries to run natively on a Lucene.Net index.

• Automatically converts PONOs to Documents and back
• Add, delete and update documents in atomic transaction
• Unit of Work pattern automatically tracks and flushes updated documents
• Update/replace documents with [Field(Key=true)] to prevent duplicates
• Term queries
• Prefix queries
• Range queries and numeric range queries
• Complex boolean queries
• Native pagination using Skip and Take
• Support storing and querying NumericField
• Automatically convert complex types for storing, querying and sorting
• Custom boost functions using IQueryable.Boost() extension method
• Sort by standard string, NumericField or any type that implements IComparable
• Sort by item.Score() extension method to sort by relevance
• Specify custom format for DateTime stored as strings
• Register cache-warming queries to be executed when IndexSearcher is being reloaded

To install the Lucene.Net.Linq package, run the following command in the Package Manager Console

PM> Install-Package Lucene.Net.Linq

1. Using fluent syntax to configure mappings
2. Using attributes to configure mappings
3. Specifying document keys

Initial versions of the library include a query filter when your entites specify a document key or key field in their mappings. The intention of this filter is to ensure that multiple entity types can be stored in a single index without unexpected errors.

It has been pointed out that this query filter adds significant overhead to query performance and goes against a best practive of using a different index for each type of document being stored.

To maintain backwards compatibility, the feature is left enabled by default, but it can now be disabled by doing:

luceneDataProvider.Settings.EnableMultipleEntities = false;

Future versions of this library may change the default behavior.

See Issues on the GitHub project page.