Reload Json content in MVVM and WPF - wpf

Question

I have a Model called FieldModel. In ViewModel I am setting its properties through a json file parsing like this:
foreach (var field in innerClass.Item2.Properties)
{
FieldView fieldView = new FieldView(field);
fieldView.ClassName = classView.ClassName;
fieldView.IsAbstract = classView.IsAbstract;
FieldViewItems.Add(fieldView);
}
My question is: how to make the binding properly with the reload button in order to reload the content of json file when it's being modified ?

Answer 1

First implement a Command class, I prefer something like this :
public class GeneralCommand : ICommand
{
private Action ToBeExecutedAction;
private Func<bool> ExecutionValidatorFunc;
public GeneralCommand(Action toBeExecutedAction, Func<bool> executionValidatorFunc)
{
ToBeExecutedAction = toBeExecutedAction;
ExecutionValidatorFunc = executionValidatorFunc;
}
public bool CanExecute(object parameter)
{
return ExecutionValidatorFunc();
}
public event EventHandler CanExecuteChanged;
public void Execute(object parameter)
{
ToBeExecutedAction();
}
}
Now inside your ViewModel class, implement something like the following :
public class FieldModel : INotifyPropertyChanged
{
private GeneralCommand _generalCommand;
public FieldModel()
{
Action action = new Action(ChangeValue);
_generalCommand = new GeneralCommand(action, new Func<bool>(() => true));
}
public ICommand ReloadValues
{
get
{
return _generalCommand;
}
}
string _jsonText;
public string JsonText
{
get
{
return _jsonText;
}
}
private void ChangeValue()
{
//Change JsonText here
//Then raise event change to be updated
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs("TextJson"));//Here fill property name
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
Then from the Xaml bind your Reload button into command property ReloadValues inside your ViewModel object, and bind the JsonText property with a WPF control for example a Textbox.
Hope this is useful.