Definition
Assembly: Microsoft.Restier.Core.dll Namespace: Microsoft.Restier.Core.QuerySyntax
Summary
Represents a service that replace queryable source of an expression.Remarks
Query expression sourcing converts an expression that identifies API data in a normalized manner to an equivalent representation in terms of the underlying data source proxy. Sourcing is the last step that occurs when processing a query expression, and only happens on expressions that represent API data that cannot be expanded into any more primitive of an expression.Methods
ReplaceQueryableSource Abstract
Replace queryable source of an expression.Syntax
Parameters
| Name | Type | Description |
|---|---|---|
context | Microsoft.Restier.Core.Query.QueryExpressionContext | The query expression context. |
embedded | bool | Indicates if the sourcing is occurring on an embedded node. |
Returns
Type:System.Linq.Expressions.Expression
A data source expression that represents the visited node.
Remarks
When embedded isfalse, this method
should produce a constant expression whose value is a queryable
object produced by calling into the underlying data source proxy.
When embedded is true, this method should
return an expression that represents the API data identified by
the visited node in terms of the underlying data source proxy.
Consider an example where the data source API has a method to get
a query over customers, accessed through “data.GetCustomers()”.
When embedded is false, this method should call
that method and return a constant expression containing the query.
When embedded is true, this method should build
a call expression to “GetCustomers” where the object to which it
applies is a constant expression whose value is the data object.