Refresh UI in WPF

Question

I have a question, I am building small login system, basically its ready and working, but still having some problems with UI, si if I take such button click action

    private void LoadButton_Click(object sender, RoutedEventArgs e)
    {
        Nullable<bool> creditencialFile = _controls.CredencialsFileDialog.ShowDialog();
        if (creditencialFile == true)
        {
            ContextStatic.Filename = _controls.CredencialsFileDialog.FileName;
            FileInfo creditencialsFileInfo = new FileInfo(ContextStatic.Filename);
            ContextStatic.RootFolder = creditencialsFileInfo.DirectoryName;
            model.LeapCreditencials = CredentialHelper.LoadCredentials(ContextStatic.Filename);
        }
    }

It loads credentials from file, and they are saved in object attribute:

model.LeapCreditencials = CredentialHelper.LoadCredentials(ContextStatic.Filename);

Now i want to refresh or reload UI so I all information windows would be set up to with new info. Question is should I need to reload per one control, or there is a smart way to reload Ui with new object values?

If you are building a WPF application without using binding, then you would be better off using WinForms. And while you are onto binding, it's recommended to do it using MVVM too. — Jai
– Jai, Commented Jun 20, 2016 at 9:49

Eldho · Accepted Answer · 2016-06-20 09:55:20Z

3

Yes, you should implement INotifyPropertyChanged in your model msdn description to implement INotify Interface

The INotifyPropertyChanged interface is used to notify clients, typically binding clients, that a property value has changed.
When value of model is changed it will reflect in the UI.

Xaml

 <TextBox Text="{Binding Mymodel.CustomerName,
           UpdateSourceTrigger=PropertyChanged}" />

Model

public class DemoCustomer : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    // This method is called by the Set accessor of each property.
    // The CallerMemberName attribute that is applied to the optional propertyName
    // parameter causes the property name of the caller to be substituted as an argument.
    private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    public string CustomerName
    {
        get
        {
            return this.customerNameValue;
        }

        set
        {

                this.customerNameValue = value;
                NotifyPropertyChanged();
        }
    }

edited Jun 20, 2016 at 9:55

answered Jun 20, 2016 at 9:50

Eldho

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3 Comments

nkoniishvt Over a year ago

Bindings should be used between view and viewmodel layer, not between view and model

Eldho Over a year ago

There should be viewmodel between this, This is a concise of the answer

nkoniishvt Over a year ago

I thought it was confusing because you talk about "model" in the binding and in your description. Just wanted to point out that but your code will work

Alex · Accepted Answer · 2016-06-20 09:51:10Z

-1

Yeah, there's a smart way. It's called MVVM (a.k.a. Model View View Model). It is not so hard to understand. You just bind your view to values in ViewModel, and when a value is changed UI is automatically updated.

answered Jun 20, 2016 at 9:51

Alex

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