4C/GummingCommon/Controls/DateRangeViewModule.cs

using System;
using System.Windows.Input;

namespace GummingCommon
{
    public class DateRangeViewModule : ViewModelBase
    {
        #region base parameters
        public DateRangeView View { get; set; }
        public bool IsConfirm;
        #endregion

        #region constructor
        public DateRangeViewModule()
        {
            View = new DateRangeView();
            View.DataContext = this;
            
            InitializeCommands();
            InitializeParameters();
            
        }

        public void ShowDialog(string datefield)
        {
            HeaderTitle = string.Format("Please select data ranage for the filter field of {0}", datefield);
            if (SelectStartTime == null || SelectStartTime.Equals(DateTime.MinValue))
                SelectStartTime = DateTime.Now;
            if (SelectEndTime == null || SelectEndTime.Equals(DateTime.MinValue))
                SelectEndTime = DateTime.Now;
            View.ShowDialog();
        }

        private void InitializeCommands()
        {
            
            CancelCommand = new DelegateCommand(OnCancelCommand);
            AddCommand = new DelegateCommand(OnAddCommand);
        }

        public override void InitializeParameters(object content = null)
        {
            IsConfirm = false;
            WindowTitle = "";
        }

        ~DateRangeViewModule()
        {
        }
        #endregion

        #region Binding Properties
        public string WindowTitle { get; private set; }

        private string _HeaderTitle;
        public string HeaderTitle
        {
            get
            {
                return _HeaderTitle;
            }
            set
            {
                _HeaderTitle = value;
                OnPropertyChanged("HeaderTitle");
            }
        }

        private DateTime _SelectStartTime;
        public DateTime SelectStartTime
        {
            get
            {
                return _SelectStartTime;
            }
            set
            {
                _SelectStartTime = value;
                OnPropertyChanged("SelectStartTime");
            }
        }

        private DateTime _SelectEndTime;
        public DateTime SelectEndTime
        {
            get
            {
                return _SelectEndTime;
            }
            set
            {
                _SelectEndTime = value;
                OnPropertyChanged("SelectEndTime");
            }
        }
        
        #endregion

        #region Binding Commands

        private ICommand _AddCommand;
        public ICommand AddCommand
        {
            get
            {
                return _AddCommand;
            }
            set
            {
                _AddCommand = value;
                OnPropertyChanged("AddCommand");
            }
        }

        private ICommand _CancelCommand;
        public ICommand CancelCommand
        {
            get
            {
                return _CancelCommand;
            }
            set
            {
                _CancelCommand = value;
                OnPropertyChanged("CancelCommand");
            }
        }
        #endregion

        #region Private Methods 
        private void OnCancelCommand(object sender)
        {
            View.DialogResult = true;
        }

        private void OnAddCommand(Object sender)
        {           
            if (SelectStartTime == null)
            {
                ShowMessageBox("Please select start date.");
                return;
            }
            if (SelectEndTime == null)
            {
                ShowMessageBox("Please select end date.");
                return;
            }
            if (SelectStartTime > SelectEndTime)
            {
                ShowMessageBox("The start date should less than end date.");
                return;
            }

            IsConfirm = true;
            View.DialogResult = true;            
        }
      
        #endregion
    }        
}