CODEWITHSUNDEEP
c#wpfparent-child
Eric after dark
Eric after dark

Reputation: 1808

How to effect change from child to parent window

This is probably a fairly simple question, but I have had no luck researching it thus far. I have a child window that has a yes and no button on it. When I click no I would like a check box to become unchecked in the parent window (which is the main window of my program).

Is there anyway that I could do something like?:

//No Button
private void No_Click(object sender, RoutedEventArgs e)
{
    NameOfParent.checkBox.Checked = false;
}

I've seen this question but do not think that it exactly addresses my problem.

What is the correct way to go about this?

I've been using this to open my other windows:

Parent Window - Current code:

//Open new window
private void checkBox5_Checked(object sender, RoutedEventArgs e)
{
       var newWindow = new ChildWindow();
       newWindow.button_no.Click += buttonNo_click;
       newWindow.Show();
}

//Unchecks Checkbox 5
private void buttonNo_click(object sender, RoutedEventArgs e)
{
    checkBox5.IsChecked = false;
}

Upvotes: 0

Views: 1165

Answers (2)

user2596213
user2596213

Reputation:

Opening the child window from the parent window:

private void Button_Click_1(object sender, RoutedEventArgs e)
    {
        var window = new ChildWindow();
        window.buttonNo.Click += buttonNo_Click;
        window.Show();
    }

In the code of the parent window, include this click event for the child window's no button:

    private void buttonNo_Click(object sender, RoutedEventArgs e)
    {
        //code to uncheck the checkbox goes here
    }

This turned out even simpler than the solution for Windows Forms that I've been using...and it appears to work in Windows Forms as well.

Upvotes: 2

ayla
ayla

Reputation: 3546

On construction of the child window, simply add a parameter that is of the type of the parent window. Then when you are constructing your child window in the parent window code do the following (In The Parent Window Class):

ChildWindow child = new ChildWindow(this, other_param, other_param2.....);
ChildWindow.Show();

The keyword this will pass the parent window into the ChildWindow

Then you can store it into a class variable and access properties of it.

Child class constructor and parentWindow variable:

private ParentWindowType m_parentWindow = new ParentWindowType();
public ChildWindow(ParentWindowType parent, int other_param, string other_param2....)
{
    m_parentWindow = parent;
}

Then in other child class methods, such as your button click handler you can access properties from the parent window:

public void ButtonClickHandler(....)
{
    m_parentWindow.checkBox1.Enabled = true;
    m_parentWindow.checkBox1.Checked = true;
}

This way you can store the parent window within the child window, and always have access to it. Its nice and clean and simple this way. Ensure to make the parent window variable private in the child window class.

If made public, it would allow you to do funny things like 

parentWindow.childWindow.m_parentWindow.childWindow etc......

Upvotes: -1

Related Questions