https://learn.microsoft.com/tr-tr/dotnet/api/system.data.common.commandtrees.dbexpressionvisitor-1?view=netframework-4.8.1
DbExpressionVisitorTResultType Class (System.Data.Common.CommandTrees) | Microsoft Learn
Defines the basic functionality that should be implemented by visitors that return a result value of a specific type.
class systemdatacommonmicrosoftlearn