CommandHandlerExtensions.GetCommandState<T> Method
Definition
Important
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Called to determine the state of the command.
public:
generic <typename T>
where T : Microsoft::VisualStudio::Commanding::CommandArgs[System::Runtime::CompilerServices::Extension]
static Microsoft::VisualStudio::Commanding::CommandState GetCommandState(Microsoft::VisualStudio::Commanding::ICommandHandler ^ commandHandler, T args, Func<Microsoft::VisualStudio::Commanding::CommandState> ^ nextCommandHandler);public static Microsoft.VisualStudio.Commanding.CommandState GetCommandState<T> (this Microsoft.VisualStudio.Commanding.ICommandHandler commandHandler, T args, Func<Microsoft.VisualStudio.Commanding.CommandState> nextCommandHandler) where T : Microsoft.VisualStudio.Commanding.CommandArgs;static member GetCommandState : Microsoft.VisualStudio.Commanding.ICommandHandler * 'T * Func<Microsoft.VisualStudio.Commanding.CommandState> -> Microsoft.VisualStudio.Commanding.CommandState (requires 'T :> Microsoft.VisualStudio.Commanding.CommandArgs)<Extension()>
Public Function GetCommandState(Of T As CommandArgs) (commandHandler As ICommandHandler, args As T, nextCommandHandler As Func(Of CommandState)) As CommandStateType Parameters
- T
Parameters
- commandHandler
- ICommandHandler
A command handler to query the state of the command.
- args
- T
The CommandArgs arguments for the command.
- nextCommandHandler
- Func<CommandState>
The next command handler in the command execution chain.
Returns
A CommandState instance that contains information on the availability of the command.
Remarks
A command handler can implement ICommandHandler<T> or IChainedCommandHandler<T>, but either way this method returns the final state of the command as returned by either this or next command handler.
If commandHandler implements ICommandHandler<T>, its GetCommandState(T) method is called. If it returns Unspecified, nextCommandHandler is invoked.
If commandHandler implements IChainedCommandHandler<T>, its GetCommandState(T, Func<CommandState>) method is invoked with nextCommandHandler passed as an argument.