How to programmatically click a button in WPF

Question

Since there s no button PerformClick   method in WPF  is there a way to click a WPF button programmatically

User · Answer

As Greg D said  I think that an alternative to Automation to click a button using the MVVM pattern  click event raised and command executed  is to call the OnClick method using reflection   typeof System Windows Controls Primitives ButtonBase  GetMethod  OnClick   BindingFlags Instance   BindingFlags NonPublic  Invoke button  new object 0

User · Answer

Like JaredPar said you can refer to Josh Smith s article towards Automation  However if you look through comments to his article you will find more elegant way of raising events against WPF controls  someButton RaiseEvent new RoutedEventArgs ButtonBase ClickEvent      I personally prefer the one above instead of automation peers

User · Answer

When using the MVVM Command pattern for Button function  recommended practice   a simple way to trigger the effect of the Button is as follows   someButton Command Execute someButton CommandParameter     This will use the Command object which the button triggers and pass the CommandParameter defined by the XAML

User · Answer

One way to programmatically  click  the button  if you have access to the source  is to simply call the button s OnClick event handler  or Execute the ICommand associated with the button  if you re doing things in the more WPF-y manner    Why are you doing this   Are you doing some sort of automated testing  for example  or trying to perform the same action that the button performs from a different section of code

User · Answer

The problem with the Automation API solution is  that it required a reference to the Framework assembly UIAutomationProvider as project package dependency   An alternative is to emulate the behaviour  In the following there is my extended solution which also condiders the MVVM-pattern with its bound commands - implemented as extension method   public static class ButtonExtensions            lt summary gt          Performs a click on the button  lt br  gt          This is the WPF-equivalent of the Windows Forms method   lt see cref  M System Windows Forms Button PerformClick    gt             lt para gt This simulates the same behaviours as the button was clicked by the user by keyboard or mouse  lt br   gt          1  The raising the ClickEvent  lt br   gt          2 1  Checking that the bound command can be executed  calling  lt see cref  ICommand CanExecute    gt   if a command is bound  lt br   gt          2 2  If command can be executed  then the  lt see cref  ICommand Execute object     gt  will be called and the optional bound parameter is p          lt  para gt           lt  summary gt           lt param name  sourceButton  gt The source button  lt  param gt           lt exception cref  ArgumentNullException  gt sourceButton lt  exception gt      public static void PerformClick this Button sourceButton                   Check parameters         if  sourceButton    null              throw new ArgumentNullException nameof sourceButton                1   Raise the Click-event         sourceButton RaiseEvent new RoutedEventArgs System Windows Controls Primitives ButtonBase ClickEvent                2   Execute the command  if bound and can be executed         ICommand boundCommand   sourceButton Command          if  boundCommand    null                        object parameter   sourceButton CommandParameter              if  boundCommand CanExecute parameter     true                  boundCommand Execute parameter

User · Answer

this PowerButton RaiseEvent new RoutedEventArgs Button ClickEvent

User · Answer

if you want to call click event   SomeButton RaiseEvent new RoutedEventArgs Button ClickEvent      And if you want the button looks like it is pressed   typeof Button  GetMethod  set IsPressed   BindingFlags Instance   BindingFlags NonPublic  Invoke SomeButton  new object     true       and unpressed after that   typeof Button  GetMethod  set IsPressed   BindingFlags Instance   BindingFlags NonPublic  Invoke SomeButton  new object     false       or use the ToggleButton

User · Answer

WPF takes a slightly different approach than WinForms here   Instead of having the automation of a object built into the API  they have a separate class for each object that is responsible for automating it   In this case you need the ButtonAutomationPeer to accomplish this task   ButtonAutomationPeer peer   new ButtonAutomationPeer someButton   IInvokeProvider invokeProv   peer GetPattern PatternInterface Invoke  as IInvokeProvider  invokeProv Invoke      Here is a blog post on the subject   Note  IInvokeProvider interface is defined in the UIAutomationProvider assembly

[c#] How to programmatically click a button in WPF?

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