additem.cs

微软的行业应用解决方案示例

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Forms;
using HardwareDistributor.Properties;
using Microsoft.WindowsCE.Forms;


namespace HardwareDistributor.UI
{
	public partial class AddItem : Form
    {
        #region Members

        private NewOrder _parent; //holds the reference to the parent form 
		private List<Business.Inventory> inventoryList = null;

        //use precompiled Reg expression for performance
        private static Regex notNaturalNumber = new Regex("[^0-9]");
        private Regex isNaturalNumber = new Regex("0*[1-9][0-9]*");

        #endregion

        #region Constructors

        /// <summary>
		/// constructor
		/// </summary>
		/// <param name="source"></param>
		public AddItem(NewOrder source)
		{
			InitializeComponent();

			// Keeping the parent so we know where to add the item that the user picked
			_parent = source;

			// We are removing both the Control Box and the Minimize Box, so that we don't
			// have to handle these in our code. This is not necessary in Windows Mobile Standard,
			// but we are writing this code so that it works on all platforms without any changes
			// or any recompiling.
			this.ControlBox = false;
			this.MinimizeBox = false;

			InputModeEditor.SetInputMode(quantityTextBox, InputMode.Numeric);
        }

        #endregion

        #region Event Handlers

        /// <summary>
		/// Fires when add soft key is clicked, so add the item to the parent dialog
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void menuItem2_Click(object sender, EventArgs e)
		{
            AddInventoryItem();
		}

        /// <summary>
        /// Fires when the object is loaded
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void AddItem_Load(object sender, EventArgs e)
        {
            BindInventoryDisplay();
        }

        /// <summary>
        /// Fires if the close soft key is clicked
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void menuItemCancel_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        /// <summary>
        /// auto select the contents of the text box 
        /// </summary>
        /// <param name="sender">NA</param>
        /// <param name="e">NA</param>
        private void quantityTextBox_GotFocus(object sender, EventArgs e)
        {
            quantityTextBox.SelectAll();
        }

        /// <summary>
        /// Custom Handling for the back key
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void BackKeyDown(object sender, KeyEventArgs e)
        {
            if ((e.KeyCode == System.Windows.Forms.Keys.Back))
            {
                // Back

                // if the back key is hit, close the dialog
                this.Close();
            }
        }

        #endregion

        #region Methods

        /// <summary>
		/// Fires when user selects a different item in the combo box
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void InventoryItemsCombobox_SelectedIndexChanged(object sender, EventArgs e)
		{
            UpdateInventoryItemDetails();
		}

        /// <summary>
        /// update the selected inventory item's price and display image
        /// </summary>
        private void UpdateInventoryItemDetails()
        {
            //get the object 
            Business.Inventory inventory = (Business.Inventory)InventoryItemsComboBox.SelectedItem;

            //update the price
            priceLabel.Text = "$ " + inventory.Price.ToString();

            try
            {

                //Display hardware picture in PictureBox
                Bitmap currentImage = new Bitmap(inventory.PictureAsStream);

                //adjust height according to picure box dimensions
                if (currentImage.Height > pictureBox1.Height)
                {
                    pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
                    pictureBox1.Width = currentImage.Width;
                }
                else
                {
                    pictureBox1.SizeMode = PictureBoxSizeMode.CenterImage;
                    pictureBox1.Width = this.Width;
                }

                pictureBox1.Image = currentImage;
            }
            catch (Exception ex)
            {
                Business.Services.LogErrors(ex);
                MessageBox.Show(Resources.DisplayPictureError, Resources.SystemError);
            }
        }

        /// <summary>
        /// Adds inventory item to the list
        /// </summary>
        private void AddInventoryItem()
        {

            string qty = quantityTextBox.Text;

            //if valid number
            if (!notNaturalNumber.IsMatch(qty) && isNaturalNumber.IsMatch(qty))
            {
                //extract number
                int quantity = System.UInt16.Parse(quantityTextBox.Text);

                //Get selected Inventory object
                Business.Inventory inventory = (Business.Inventory)InventoryItemsComboBox.SelectedItem;

                //invoke parent with inventory item data 
                if (_parent.AddInventoryItem(inventory, quantity))
                {
                    this.Close();
                }
            }
            else
            {
                MessageBox.Show(Resources.NumberValidationMsg);
            }
        }

        /// <summary>
        /// binds the combo box with the inventory items list 
        /// </summary>
        private void BindInventoryDisplay()
        {
            //Retrieve InventoryCollection
            inventoryList = Business.Services.GetInventory();

            //Display inventory items
            InventoryItemsComboBox.DisplayMember = "InventoryName";
            InventoryItemsComboBox.ValueMember = "InventoryId";
            InventoryItemsComboBox.DataSource = inventoryList;
        }

        #endregion
    }
}