Class EPCommand

The base command for all commands in the LemonEdge platform, implementing the IEPCommand interface

Commands inheriting this can be displayed on the main menu and anywhere throughout the application. View specific commands should typically inherit from ViewCommand

Inheritance

object

BaseHasChildren<EPCommandWithDescriptor>

EPCommand

About

AddToFavourites

Close

CloseOtherTabs

AnyCollectionCommand

AnyItemCommand

CustomCommand

EPCommandWithDescriptor

EntityCollectionCommand<T>

GroupedItemsCommand

NewItemCommand

OpenItemCommand

Dashboard

DataSourceSearch

DatabaseSchema

ExportTemplate

GenerateCode

Quit

RefreshAll

RefreshContext

RefreshServers

RemoveFromFavourites

Settings

SwitchUser

Implements

IHasChildren<EPCommandWithDescriptor>

IHasChildren

IEPCommand

ICommand

IDisposable

Inherited Members

BaseHasChildren<EPCommandWithDescriptor>.AddChild(EPCommandWithDescriptor, bool)

BaseHasChildren<EPCommandWithDescriptor>.DeleteChild(EPCommandWithDescriptor)

BaseHasChildren<EPCommandWithDescriptor>.ClearChildren()

BaseHasChildren<EPCommandWithDescriptor>.ClearMyParent()

BaseHasChildren<EPCommandWithDescriptor>.AddChild(IHasChildren)

BaseHasChildren<EPCommandWithDescriptor>.DeleteChild(IHasChildren)

BaseHasChildren<EPCommandWithDescriptor>.Order

BaseHasChildren<EPCommandWithDescriptor>.Children

BaseHasChildren<EPCommandWithDescriptor>.Parent

object.GetType()

object.MemberwiseClone()

object.ToString()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

Namespace: LemonEdge.Client.Core.Commands.Core

Assembly: LemonEdge.ClientCore.dll

Syntax

public abstract class EPCommand : BaseHasChildren<EPCommandWithDescriptor>, IHasChildren<EPCommandWithDescriptor>, IHasChildren, IEPCommand, ICommand, IDisposable

Constructors

EPCommand(IModelLayoutCommon, EPCommandWithDescriptor)

Creates a new EPCommand

Declaration

protected EPCommand(IModelLayoutCommon owner, EPCommandWithDescriptor parent = null)

Parameters

Type	Name	Description
IModelLayoutCommon	owner	The owning context this command operates within
EPCommandWithDescriptor	parent	An optional parent command if this command is a child command

Properties

ActiveDisplayerFromOwner

Returns the active layout this command is working against depending on the owner type.

Returns the owner itself if it is of type IModelLayoutDisplayer, else returns the active layout if it is of type IModelLayoutHost

Declaration

protected IModelLayoutDisplayer ActiveDisplayerFromOwner { get; }

Property Value

Type	Description
IModelLayoutDisplayer

CustomType

The custom type of command if this command needs special handling in the client UI that can not be performed generically from the core UI

Declaration

public EPCommandCustomType CustomType { get; }

Property Value

Type	Description
EPCommandCustomType

From

Declaration

public ICommandDescriptor From { get; set; }

Property Value

Type	Description
ICommandDescriptor

HasChildCommands

Indicates this command has child commands that should be loaded by the LemonEdge system using LoadChildrenAsync()

The default is false

Declaration

public virtual bool HasChildCommands { get; }

Property Value

Type	Description
bool

IsQuickAccessCommand

Indicates this command should also be available in a quick access manner if the ui permits it to be highlighted and seperated for quick access among a group of other commands

For instance in the desktop application view commands are accessible from a drop down menu by default, but if this is true they are also directly accessible from the view itself

Declaration

public virtual bool IsQuickAccessCommand { get; }

Property Value

Type	Description
bool

Key

Indicates the command key to use for executing this from a keyboard command

Declaration

public virtual KeyboardKey Key { get; }

Property Value

Type	Description
KeyboardKey

LockExecution

An external lock that will disable execution of this command (via CanExecute(object) returning false) until it is set back to the default false.

Declaration

public bool LockExecution { get; set; }

Property Value

Type	Description
bool

ModifierKeys

Indicates the modifier keys to be used with Key when executing this command from the keyboard

Declaration

public virtual KeyboardModifierKeys ModifierKeys { get; }

Property Value

Type	Description
KeyboardModifierKeys

Owner

The owning context this command operates within

Declaration

public IModelLayoutCommon Owner { get; }

Property Value

Type	Description
IModelLayoutCommon

ReloadChildrenOnEachOpen

Indicates each time this command is "expanded" in the client application that it should reload the child commands in case they have changed

The default is false, in that child commands are only loaded once and cached for the command itself

Declaration

public virtual bool ReloadChildrenOnEachOpen { get; }

Property Value

Type	Description
bool

Seperator

The static separator instance that has no command action

Declaration

public static ViewCommandSeperator Seperator { get; }

Property Value

Type	Description
ViewCommandSeperator

SubscribeToLayoutChange

Indicates this command should track changes to the layouts and reevaluate its Can Execute status.

Used by commands such as Save which change their enabled status depending on the currently active layout

Declaration

public virtual bool SubscribeToLayoutChange { get; }

Property Value

Type	Description
bool

Toggler

If this command can toggle between two states, then this toggler implementation provides a mechanism for the command to react to the toggled state changing

Declaration

public IHasToggleStatus Toggler { get; }

Property Value

Type	Description
IHasToggleStatus

Methods

Dispose()

Declaration

public void Dispose()

Dispose(bool)

Declaration

protected virtual void Dispose(bool disposing)

Parameters

Type	Name	Description
bool	disposing

ExternalCanExecute(object)

Returns if this command can be executed from the client application UI.

You must override InternalCanExecute(object) or InternalCanExecuteAsync(object) in order to implement if it can be executed

The system also checks if it is currently executing or if it is locked, to return false as well

Declaration

public Task<bool> ExternalCanExecute(object parameter)

Parameters

Type	Name	Description
object	parameter	The command parameter

Returns

Type	Description
Task<bool>	True if this command can currently be executed from the client application UI.

ExternalExecute(object)

Executes the commands as an asynchronous operation. CanExecute(object) returns False until this call has completed

Declaration

public Task ExternalExecute(object parameter)

Parameters

Type	Name	Description
object	parameter	The command parameter

Returns

Type	Description
Task	A task indicating the completion of the command execution

GetModifierText(IEPCommand)

Returns the helper text indicating how to execute this command using modifier keys. For instance if Key = A, and ModifierKeys = Alt, this would return [Alt+A]

Declaration

public static string GetModifierText(IEPCommand command)

Parameters

Type	Name	Description
IEPCommand	command	The commmand to return the modifier key binding text for

Returns

Type	Description
string	Helper text indicating how to execute this command using modifier keys. For instance if Key = A, and ModifierKeys = Alt, this would return [Alt+A]

InternalCanExecute(object)

Returns if this command can be executed or not from the client application UI

You must override InternalCanExecute(object) or InternalCanExecuteAsync(object) in order to implement if it can be executed

Declaration

public virtual bool InternalCanExecute(object parameter)

Parameters

Type	Name	Description
object	parameter	The command parameter

Returns

Type	Description
bool	If this command can be executed or not from the client application UI

InternalCanExecuteAsync(object)

Returns if this command can be executed or not from the client application UI

You must override InternalCanExecute(object) or InternalCanExecuteAsync(object) in order to implement if it can be executed

Declaration

public virtual Task<bool> InternalCanExecuteAsync(object parameter)

Parameters

Type	Name	Description
object	parameter	The command parameter

Returns

Type	Description
Task<bool>	If this command can be executed or not from the client application UI

InternalExecute(object)

You must override InternalExecuteAsync(object) or InternalExecute(object) in order to implement your commands action

Declaration

public virtual void InternalExecute(object parameter)

Parameters

Type	Name	Description
object	parameter	The command parameter

InternalExecuteAsync(object)

You must override InternalExecuteAsync(object) or InternalExecute(object) in order to implement your commands action

Declaration

public virtual Task InternalExecuteAsync(object parameter)

Parameters

Type	Name	Description
object	parameter	The command parameter

Returns

Type	Description
Task

LoadChildrenAsync()

Provides an inheriting command the opportunity to load any child commands contained within it

Declaration

public virtual Task LoadChildrenAsync()

Returns

Type	Description
Task

OnCanExecuteChanged()

Provides a mechanism for the command to raise its CanExecuteChanged event

Declaration

public void OnCanExecuteChanged()

OnLayoutsChanged(IModelLayoutHost, LayoutChangeEventArgs)

If SubscribeToLayoutChange is true then this is called everytime the layout changes with the type of change

Declaration

protected virtual void OnLayoutsChanged(IModelLayoutHost sender, LayoutChangeEventArgs e)

Parameters

Type	Name	Description
IModelLayoutHost	sender	The source host that is raising the change of layout
LayoutChangeEventArgs	e	The way in which the main form layouts have changed

RemoveEventHandlersOnDispose()

Provides an inheriting command the opoortunity to remove any event handlers being listened to before this command is disposed

Declaration

protected virtual void RemoveEventHandlersOnDispose()

SetToggler(IHasToggleStatus)

Sets the toggler to use for this command if it should be represented as a toggle command

Declaration

protected void SetToggler(IHasToggleStatus toggler)

Parameters

Type	Name	Description
IHasToggleStatus	toggler	The toggler to use for the Toggler of this command

Events

CanExecuteChanged

The event indicating the commands can execute has changed

Declaration

public event EventHandler CanExecuteChanged

Event Type

Type	Description
EventHandler

Implements

IHasChildren<T>

IHasChildren

IEPCommand

ICommand

IDisposable

Extension Methods

CommandExtensions.CreateCommand(EPCommand, ICommandDescriptor, CommandButtonType, bool, CommandSize)

CommandExtensions.UpdateCommand(EPCommand, object, ICommandDescriptor, bool, CommandSize)

LinqExtensions.AsArray<T>(T)

LinqExtensions.ToArrayOfOne<T>(T)

LinqExtensions.ToListOfOne<T>(T)

MiscExtensions.SetIfNotEqual<T, TP>(T, Expression<Func<T, TP>>, TP)

WeakReferenceExtensions.WeakReference(object)

SQLExtensions.ToSQLValue(object, bool)

ReflectionExtensions.ClearEventInvocations(object, string)

StringExtensions.ToCSVFormatString(object, Type)