How to call Button_click event from Viewmodel in WPF

Question

In my project I used one button "Refresh" to refresh the DataGrid and registrtion from. This means when I insert a specific record that time it will insert into a database, and on the UI the Datagrid is not refreshing and the registration form is also maintaining filled information. Then if I click on the "refresh" button then the Datagrid and Registration form will also be refreshed. The problem is I am unable to write the refresh code in my Viewmodel. Therefore I wrote it in my Xaml.cs file. Here is my button click event:

Xaml.cs

 public void Button_Click(object sender, RoutedEventArgs e)
 {
     viewmodelObj = new AndazPatrakViewModel();
     viewmodelObj.BtnKharchKhVisibility = "Collapsed";
     viewmodelObj.BtnUtpannakhVisibility = "Visible";

     viewmodelObj.GetMaxId();
     this.DataContext = viewmodelObj;
 }

So in Viewmodel after Dbcontext.SaveChanges(); I want to call the Button_Click event shown above, but it asks for parameters for that function. How can i call this Button_Click event from my viewModel?

Put the code that is in the Button_Click in the ViewModel. And call it from the Button_click (or remove the button_click and assign a command to the button) This way you can call the method from with your viewmodel. — Emond
– Emond, Commented Mar 5, 2016 at 14:25
if i set Command for button .. then required output is not getting.. — Rahul Chaudhari
– Rahul Chaudhari, Commented Mar 6, 2016 at 11:11
Add properties for the 'parameters' to the viewmodel and bind the view to these properties. — Emond
– Emond, Commented Mar 6, 2016 at 14:56

Domysee · Accepted Answer · 2016-03-05 13:09:34Z

1

It seems you already figured out how to get a reference to the code behind class.
So, since your Button_Click does not use its parameters, you could call it with null.

So, in your viewmodel:

codeBehindInstance.Button_Click(null, null);

answered Mar 5, 2016 at 13:09

Domysee

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5 Comments

Rahul Chaudhari Over a year ago

thank you @Domysee now it works... but my window is not refreshing.. can you tell me how can i do that..??

Domysee Over a year ago

@RahulChaudhari you should have a look at INotifyPropertyChanged and implement it in your viewmodel. For collections, use ObservableCollection. If you did both, it will allow you to write the refresh code in your viewmodel. I answered a question just yesterday with a base implementation of INotifyPropertyChanged, here.

Domysee Over a year ago

@RahulChaudhari why it doesnt work as it is now I'm not sure, I'd have to take a deeper look into your code.

Rahul Chaudhari Over a year ago

Yes i used it.. I bind Itemsource one Observablecollection for my datagrid. and used INotifyPropertyChanged for same observablecollection

Domysee Over a year ago

@RahulChaudhari if you like, you can ask a new question why the view doesnt update if you use INotifyPropertyChanged in your viewmodel. Its out of scope for this question, and the answer would probably be too long for a comment.

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