CODEWITHSUNDEEP
c#.netwpfmvvmdata-binding
Aren Hovsepyan
Aren Hovsepyan

Reputation: 2047

in WPF MVVM How to send data from Window.xaml.cs to WindowViewModels

I am creating login functionality and I need to send my information of user from my xaml.cs to my ViewModels SO when I am clicking on the button I to need show other window with my data

How can I do that

My Click function from LoginPage.xaml.cs

    private void LoginButton_OnClick(object sender, RoutedEventArgs e)
    {
        LoginPageViewModels ViewModel = new LoginPageViewModels();
        SqlHelper Sql = new SqlHelper();
        string ConnectionState = Sql.SqlConnectionState();

        // Check connection;
        if (ConnectionState == "Connected")
        {
            List<User> User = new List<User>();
            string username = UsernameInput.Text;
            string password = PasswordInput.Password;

            User = ViewModel.Auth(username, password);

            if (User.Count >= 1)
            {
                MainPage mainPage = new MainPage();
                mainPage.Show();
                this.Close();
            }
            else
            {
                AuthResultMessage.Text = "User not found";
            }
        }
        else
        {
            AuthResultMessage.Text = ConnectionState;
        }
    }

I need to send List<User> User to my new MainPage mainPage and then I need bind User to mainPage

Upvotes: 0

Views: 1680

Answers (2)

Aren Hovsepyan
Aren Hovsepyan

Reputation: 2047

I found solution

I can add User UserData {get;set;} property in MainPageViewModels.cs and in xaml.cs

private void LoginButton_OnClick(object sender, RoutedEventArgs e)
{
    LoginPageViewModels ViewModel = new LoginPageViewModels();
    SqlHelper Sql = new SqlHelper();
    string ConnectionState = Sql.SqlConnectionState();

    // Check connection;
    if (ConnectionState == "Connected")
    {
        User userData= new User;
        string username = UsernameInput.Text;
        string password = PasswordInput.Password;

        userData= ViewModel.Auth(username, password);

        if (userData.Username != null)
        {
            MainPage mainPage = new MainPage();
            mainPage.UserData=userData;
            mainPage.Show();
            this.Close();
        }
        else
        {
            AuthResultMessage.Text = "User not found";
        }
    }
    else
    {
        AuthResultMessage.Text = ConnectionState;
    }

Upvotes: 0

TheInnerLight
TheInnerLight

Reputation: 12184

If you're doing MVVM, you shouldn't generally be writing button click events. You should use data binding to bind a UI element to a property in your view model.

<TextBlock Text="{Binding Path=ViewModelTextProperty}">

where ViewModelTextProperty is the property in your view model you wish to bind to.

Buttons should be bound commands, properties which have a return type that implements the ICommand interface.

<Button Command="{Binding Path=ViewModelButtonCommand}">

where ViewModelButtonCommand is a property in your view model of type ICommand.

Your view model then has ownership of the strings and can perform the login logic using them once your the login button is clicked.

Your view model class will need to trigger PropertyChanged events when each of the bound properties are updated in order to trigger updates of the view. See this MSDN article on implementing the MVVM pattern: https://msdn.microsoft.com/en-us/library/gg405484%28v=PandP.40%29.aspx

Upvotes: 1

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