CODEWITHSUNDEEP
c#wpf
Vano Maisuradze
Vano Maisuradze

Reputation: 5909

Return result after closing window

I'm trying to get value after window dialog is closed:

public partial class MyDialogWindow: Window
{
    public string selectedItem = "";
    public MyDialogWindow(string selectedItem)
    {
        InitializeComponent();
        this.selectedItem = selectedItem;
    }

    ...
}


// To call dialog
string result = "";
MyDialogWindow dialog = new MyDialogWindow(result);
if (form.ShowDialog().Value)
{
   string res = result;
}

But 'result' always is empty. In winforms I can get this result, but in WPF not. So How to return result from window, after it is closed?

Upvotes: 3

Views: 15868

Answers (3)

yu yang Jian
yu yang Jian

Reputation: 7181

Here's an Example Window I just write:

public partial class ActionDialog : Window
{

    public ActionDialog(string msg)
    {
        InitializeComponent();
        MsgTbx.Text = msg;
    }

    //Record the user's click result
    public bool ClickResult = false;

    //In Other place need to use this Dialog just Call this Method
    public static bool EnsureExecute(string msg)
    {
        ActionDialog dialogAc = new ActionDialog(msg);
        //this line will run through only when dialogAc is closed
        dialogAc.ShowDialog(); 
        //the magic is the property ClickResult of dialogAc
        //can be accessed even when it's closed
        return dialogAc.ClickResult;
    }

    //add this method to your custom OK Button's click event        
    private void Execute_OnClick(object sender, RoutedEventArgs e)
    {
        ClickResult = true;
        this.Close();
    }

    //add this method to your custom Cancel Button click event       
    private void Cancel_OnClick(object sender, RoutedEventArgs e)
    {
        ClickResult = false;
        this.Close();
    }
}

And the code when calling the Dialog:

//simply one line can get the user's Button Click Result
bool isExecute = ActionDialog.EnsureExecute(msg);

Reference to

https://social.msdn.microsoft.com/Forums/vstudio/en-US/a5cae559-ff8c-4cd8-9c76-4e5821c9aefb/wpf-window-return-value?forum=wpf

Upvotes: 4

Justin
Justin

Reputation: 86789

Strings don't work like that in C# - they are immutable.

You could get this to work using the ref keyword as other people have suggested, however this will only work if you set SelectedItem in the constructor, which is a bit unlikely!

The normal way of doing this is to have your dialog expose a property on your dialog:

public partial class MyDialogWindow: Window
{
    public string SelectedItem
    {
        get;
        set;
    {

    // etc...
}

MyDialogWindow dialog = new MyDialogWindow(result);
if (form.ShowDialog().Value)
{
   string res = dialog.SelectedItem;
}

This is the way that other dialogs (such as the open / save file dialogs) work.

Upvotes: 6

sll
sll

Reputation: 62564

Add public property to the MyDialogWindow class and then just access it after the ShowDialog() was returned.

   class MyDialogWindow
   {
       public string UserEnteredData { get; set; }
   }


   if (form.ShowDialog().Value) 
   {    
      string res = dialog.UserEnteredData; 
   }

Upvotes: 1

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