Pass from child window to parent window

Question

I would like to ask,

I have a window called MainWindow and another one called ImportForm. In the MainWindow i call

private void generate_Window(int num_chart) 
{ 
    Window ownedWindow = new ImportForm(num_chart); 
    ownedWindow.Owner = this;      
    ownedWindow.Show(); 
}

In the child window i make some stuff and i produce some variables. like var1,var2,var3.

I want when the child window close to return var1,var2,var3 to the MainWindow and call one function let's say import_chart(var1, var2, var3)..

Any help will be apretiated. Thanks

Answer 1

It seems like an awkward design choice. Anyways, here is how you can do it:

MainWindow.cs:

private void generate_Window(int num_chart)
{
    Window ownedWindow = new ImportForm(num_chart, import_chart); 
    ownedWindow.Owner = this; 
    ownedWindow.Show();
}

private void import_chart(int n, string s, bool b)
{
    //Do something
}

ImportForm.cs:

private Action<int, string, bool> callback;
public ImportForm(int num_chart, Action<int, string, bool> action)
{
    InitializeComponent();
    Closed += ImportForm_Closed;
    callback = action;
}

private void ImportForm_Closed(object sender, EventArgs e)
{
    callback(0, "Test", false);
}

Just change the Action to the parameter types you need (and adjust ImportForm_Closed(...) to use them as well).

If anything is unclear, let me know.