| IndexKeysBuilderTDocumentWildcard Method  | 
 
            Sets a wildcard key to the index.
            
 
    Namespace: 
   MongoDB.Driver.Builders
    Assembly:
   MongoDB.Driver.Legacy (in MongoDB.Driver.Legacy.dll) Version: 2.11.0+cb27a82ea70620ad1acad8058809be8302ae4f2a
 Syntax
Syntaxpublic IndexKeysBuilder<TDocument> Wildcard(
	Expression<Func<TDocument, Object>> memberExpression = null
)
Public Function Wildcard ( 
	Optional memberExpression As Expression(Of Func(Of TDocument, Object)) = Nothing
) As IndexKeysBuilder(Of TDocument)
member Wildcard : 
        ?memberExpression : Expression<Func<'TDocument, Object>> 
(* Defaults:
        let _memberExpression = defaultArg memberExpression null
*)
-> IndexKeysBuilder<'TDocument> 
Parameters
- memberExpression (Optional)
- Type: System.Linq.ExpressionsExpressionFuncTDocument, Object
 The member expression representing the wildcard key name. If the wildcard name is empty, the generated key will be `All field paths`, otherwise `A single field path`.
Return Value
Type: 
IndexKeysBuilderTDocument
            The builder (so method calls can be chained).
            
 See Also
See Also