NavigationAware

NavigationAware.cs

using Prism.Regions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Unity;

namespace APS.Infrastructure.MVVM
{
    /// <summary>
    /// NavigationAware
    /// </summary>
    public abstract class NavigationAware : BaseViewModel , INavigationAware
    {
        private string uriQueryString;

        public event EventHandler Activate;

        public NavigationAware() { }

        public NavigationAware(IUnityContainer unityContainer, IRegionManager regionManager) 
            : base(unityContainer, regionManager) { }

        public bool IsNavigationTarget(NavigationContext navigationContext)
        {
            if(!string.IsNullOrEmpty(uriQueryString))
            {
                RaiseActivation();
                return true;
            }
            return false;
        }

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {

        }

        public void OnNavigatedTo(NavigationContext navigationContext)
        {
            if (!String.IsNullOrEmpty(uriQueryString)
                && uriQueryString.Equals(navigationContext.Uri.OriginalString))
            {
                return;
            }

            uriQueryString = navigationContext.Uri.OriginalString;

            foreach (KeyValuePair<string, object> parameter in navigationContext.Parameters)
            {
                if (parameter.Key.Equals("Caption"))
                {
                    Title = parameter.Value.ToString();
                    continue;
                }

                if(parameter.Key.Equals("Key"))
                {
                    Key = "k_" + parameter.Value.ToString();
                    continue;
                }
            }
        }

        private void RaiseActivation()
        {
            Activate?.Invoke(this, EventArgs.Empty);
        }
    }
}