enum in xaml in MVVVM

Question

hi

<MenuItem Header="StepOne"
    Command="{Binding CurrentStepCmd}"
    CommandParameter="{x:Static data:Steps.StepOne}"/>
<MenuItem Header="StepTwo"
    Command="{Binding CurrentStepCmd}"
    CommandParameter="{x:Static data:Steps.StepTwo}"/>

code works fine but:
Q1: i don't like my xaml to access any data from outside it's viewmodel (i don't like to include the
namespace "data" in xaml ).
Q2: is the solution of making ICommand for each enum value (Steps enum) better than using one cmd with param?

i'm using C# and wpf .Net framwork 4.7 app
any help will be appreciated,

Answer 1

I make a demo to implement the data in ViewModel like below:
Xaml code is:

   <Window.Resources>  
    <HierarchicalDataTemplate DataType="{x:Type local:UserModel}">  
        <MenuItem Header="{Binding Path=UserName}" Command="{Binding Path=ShowCommand}" CommandParameter="{Binding Path=UserAge}"/>  
    </HierarchicalDataTemplate>  
</Window.Resources>  
  
<Window.DataContext>  
    <local:MainViewModel></local:MainViewModel>  
</Window.DataContext>  
<StackPanel>  
    <Menu ItemsSource="{Binding LtUser}"></Menu>  
</StackPanel>  

The C# code is:

using GalaSoft.MvvmLight;  
using GalaSoft.MvvmLight.Command;  
using System.Collections.ObjectModel;  
using System.Windows;  
using System.Windows.Input;  
  
namespace CommandParameterMVVM  
{  
    public class MainViewModel:ViewModelBase  
    {  
        private ObservableCollection<UserModel> _LtUser;  
        public ObservableCollection<UserModel> LtUser  
        {  
            get { return _LtUser; }  
            set  
            {  
                if (_LtUser != value)  
                {  
                    _LtUser = value;  
                    RaisePropertyChanged("LtUser");  
                }  
            }  
        }  
  
        public MainViewModel()  
        {  
            LtUser = new ObservableCollection<UserModel>()  
            {  
                new UserModel(){UserName="Name1",UserAge="11"},  
                new UserModel(){UserName="Name2",UserAge="12"},  
                new UserModel(){UserName="Name3",UserAge="13"},  
                new UserModel(){UserName="Name4",UserAge="14"}  
            };  
        }   
    }  
  
  
    public class UserModel : ViewModelBase  
    {  
        private string _UserName;  
        public string UserName  
        {  
            get { return _UserName; }  
            set  
            {  
                if (_UserName != value)  
                {  
                    _UserName = value;  
                    RaisePropertyChanged("UserName");  
                }  
            }  
        }  
  
  
        private string _UserAge;  
        public string UserAge  
        {  
            get { return _UserAge; }  
            set  
            {  
                if (_UserAge != value)  
                {  
                    _UserAge = value;  
                    RaisePropertyChanged("UserAge");  
                }  
            }  
        }  
  
        public ICommand ShowCommand { get { return new RelayCommand<string>(OnShow); } }  
  
        private void OnShow(string obj)  
        {  
            MessageBox.Show("Age is:"+obj.ToString());  
        }  
    }  
}  

The result is:

Did it give you some help? If it does not, please give me more description to analyze.

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Answer 2

Hi,
you can you a simple string as Parameter:

 <MenuItem Header="StepOne"
     Command="{Binding CurrentStepCmd}"
     CommandParameter="StepOne}"/>
 <MenuItem Header="StepTwo"
     Command="{Binding CurrentStepCmd}"
     CommandParameter="StepTwo"/>

and in IComand.Execute use switch (Select) with state.ToString()