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IndexKeysDefinitionExtensionsGeoHaystackTDocument Method (IndexKeysDefinitionTDocument, ExpressionFuncTDocument, Object, ExpressionFuncTDocument, Object)

Combines an existing index keys definition with a geo haystack index key definition.

Namespace:  MongoDB.Driver
Assembly:  MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.9.0+32b058abcdf2c7e8d9dd3a676d207b31897eee2e
public static IndexKeysDefinition<TDocument> GeoHaystack<TDocument>(
	this IndexKeysDefinition<TDocument> keys,
	Expression<Func<TDocument, Object>> field,
	Expression<Func<TDocument, Object>> additionalFieldName = null


Type: MongoDB.DriverIndexKeysDefinitionTDocument
The keys.
Type: System.Linq.ExpressionsExpressionFuncTDocument, Object
The field.
additionalFieldName (Optional)
Type: System.Linq.ExpressionsExpressionFuncTDocument, Object
Name of the additional field.

Type Parameters

The type of the document.

Return Value

Type: IndexKeysDefinitionTDocument
A combined index keys definition.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IndexKeysDefinitionTDocument. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
See Also