CODEWITHSUNDEEP
c#wpf
Asynchronous
Asynchronous

Reputation: 3977

Accessing a member value set in previous window other then using a static member

I am attempting to access a member value in another window or across multiple windows. Is this only possible with static variables? I have two WPF Windows. MainWindow and TargetWindow.

Here is an example:

Member Class:

 class Variables
    {
        private string _userInput;

        public Variables(string input)
        {
            _userInput = input;
        }

        public string UserInput
        {
            set
            {
                _userInput = value;
            }
            get
            {
                return _userInput;
            }
        }
    }

Call and pass value to member in window:

 private void txtMainEntry_KeyUp(object sender, KeyEventArgs e)
        {
            Variables variable;

            //Passing user input to class member via constructor
            variable = new Variables(txtMainEntry.Text);

            //Get value from class member
            showUserEntry.Text = variable.UserInput;

            if (e.Key == Key.Return & variable.UserInput == "Hello World")
            {
                TargetWindow tWindow = new TargetWindow();
                tWindow.ShowDialog();
                this.Close();
            }
        }

How do I access the same value in another window without using static member:

public partial class TargetWindow : Window
{
    public TargetWindow()
    {
        InitializeComponent();
    }

    private void lblDisplayVariableValue_Loaded(object sender, RoutedEventArgs e)
    {
        //How do I call and get the value of the class member 
        //set in the previous form
    }
}

Upvotes: 1

Views: 134

Answers (1)

pushpraj
pushpraj

Reputation: 13679

There are couple of approach other then using static value, I have listed a few of them

Approach 1 (Constructors)

    private void txtMainEntry_KeyUp(object sender, KeyEventArgs e)
    {
        Variables variable;

        //Passing user input to class member via constructor
        variable = new Variables(txtMainEntry.Text);

        //Get value from class member
        showUserEntry.Text = variable.UserInput;

        if (e.Key == Key.Return & variable.UserInput == "Hello World")
        {
            TargetWindow tWindow = new TargetWindow(variable);
            tWindow.ShowDialog();
            this.Close();
        }
    }

    public partial class TargetWindow : Window
    {
        Variables variable ;

        public TargetWindow(Variables variable)
        {
            InitializeComponent();
            this.variable = variable;
        }

        private void lblDisplayVariableValue_Loaded(object sender, RoutedEventArgs e)
        {
            //use variable field
        }
    }

Approach 2 (Properties)

    private void txtMainEntry_KeyUp(object sender, KeyEventArgs e)
    {
        Variables variable;

        //Passing user input to class member via constructor
        variable = new Variables(txtMainEntry.Text);

        //Get value from class member
        showUserEntry.Text = variable.UserInput;

        if (e.Key == Key.Return & variable.UserInput == "Hello World")
        {
            TargetWindow tWindow = new TargetWindow();
            tWindow.Variable = variable;
            tWindow.ShowDialog();
            this.Close();
        }
    }

    public partial class TargetWindow : Window
    {
        public Variables Variable { get; set; }

        public TargetWindow(Variables variable)
        {
            InitializeComponent();
        }

        private void lblDisplayVariableValue_Loaded(object sender, RoutedEventArgs e)
        {
            //use Variable property
        }
    }

Note: above samples are assuming that you have to pass the variable, you may change as per your needs

other solution is to use attached properties, if above are not feasible then let me know I'll provide a sample for the same.

Upvotes: 2

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