sellcar.cs

北大青鸟内部资料

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.IO;

namespace Car_Inventory_Control
{
	/// <summary>
	/// Summary description for Sellcar.
	/// </summary>
	public class frmSellcar : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label lblCarPurchaseRate;
		private System.Windows.Forms.Label lblCarModelNumber;
		private System.Windows.Forms.ComboBox cboCarModelNo;
		private System.Windows.Forms.Label lblCarSale;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;
		private System.Windows.Forms.Label lblCarPurchaseRateDetail;
		private System.Windows.Forms.Button btnExit;
		private FileStream fstream;
		private BinaryReader breader ;
		private BinaryWriter bwriter;
		private Hashtable objCarDetails,objCarSaleDetails;
		double purchaseRate;
		double saleRate;
		private System.Windows.Forms.Button btnSell;
		private System.Windows.Forms.TextBox txtCarSaleRate;
		string modelNum;

		string filename = "d:\\CarSaleRecord.txt";
		
		

		public frmSellcar()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.lblCarPurchaseRate = new System.Windows.Forms.Label();
			this.lblCarModelNumber = new System.Windows.Forms.Label();
			this.cboCarModelNo = new System.Windows.Forms.ComboBox();
			this.txtCarSaleRate = new System.Windows.Forms.TextBox();
			this.lblCarSale = new System.Windows.Forms.Label();
			this.lblCarPurchaseRateDetail = new System.Windows.Forms.Label();
			this.btnExit = new System.Windows.Forms.Button();
			this.btnSell = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// lblCarPurchaseRate
			// 
			this.lblCarPurchaseRate.Location = new System.Drawing.Point(38, 60);
			this.lblCarPurchaseRate.Name = "lblCarPurchaseRate";
			this.lblCarPurchaseRate.Size = new System.Drawing.Size(125, 25);
			this.lblCarPurchaseRate.TabIndex = 3;
			this.lblCarPurchaseRate.Text = "汽车购买价格：";
			// 
			// lblCarModelNumber
			// 
			this.lblCarModelNumber.Location = new System.Drawing.Point(38, 17);
			this.lblCarModelNumber.Name = "lblCarModelNumber";
			this.lblCarModelNumber.Size = new System.Drawing.Size(125, 25);
			this.lblCarModelNumber.TabIndex = 2;
			this.lblCarModelNumber.Text = "汽车型号：";
			// 
			// cboCarModelNo
			// 
			this.cboCarModelNo.Location = new System.Drawing.Point(202, 17);
			this.cboCarModelNo.Name = "cboCarModelNo";
			this.cboCarModelNo.Size = new System.Drawing.Size(144, 20);
			this.cboCarModelNo.TabIndex = 4;
			this.cboCarModelNo.SelectedIndexChanged += new System.EventHandler(this.cboCarModelNo_SelectedIndexChanged);
			// 
			// txtCarSaleRate
			// 
			this.txtCarSaleRate.Location = new System.Drawing.Point(202, 112);
			this.txtCarSaleRate.Name = "txtCarSaleRate";
			this.txtCarSaleRate.Size = new System.Drawing.Size(144, 21);
			this.txtCarSaleRate.TabIndex = 7;
			this.txtCarSaleRate.Text = "";
			// 
			// lblCarSale
			// 
			this.lblCarSale.Location = new System.Drawing.Point(38, 112);
			this.lblCarSale.Name = "lblCarSale";
			this.lblCarSale.Size = new System.Drawing.Size(125, 25);
			this.lblCarSale.TabIndex = 6;
			this.lblCarSale.Text = "汽车销售价格：";
			// 
			// lblCarPurchaseRateDetail
			// 
			this.lblCarPurchaseRateDetail.Location = new System.Drawing.Point(202, 60);
			this.lblCarPurchaseRateDetail.Name = "lblCarPurchaseRateDetail";
			this.lblCarPurchaseRateDetail.Size = new System.Drawing.Size(144, 25);
			this.lblCarPurchaseRateDetail.TabIndex = 8;
			// 
			// btnExit
			// 
			this.btnExit.Location = new System.Drawing.Point(259, 164);
			this.btnExit.Name = "btnExit";
			this.btnExit.Size = new System.Drawing.Size(90, 24);
			this.btnExit.TabIndex = 10;
			this.btnExit.Text = "退出(&E)";
			this.btnExit.Click += new System.EventHandler(this.btnExit_Click);
			// 
			// btnSell
			// 
			this.btnSell.Location = new System.Drawing.Point(144, 164);
			this.btnSell.Name = "btnSell";
			this.btnSell.Size = new System.Drawing.Size(90, 24);
			this.btnSell.TabIndex = 9;
			this.btnSell.Text = "销售(&S)";
			this.btnSell.Click += new System.EventHandler(this.btnSell_Click);
			// 
			// frmSellcar
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(355, 194);
			this.Controls.Add(this.btnExit);
			this.Controls.Add(this.btnSell);
			this.Controls.Add(this.lblCarPurchaseRateDetail);
			this.Controls.Add(this.txtCarSaleRate);
			this.Controls.Add(this.lblCarSale);
			this.Controls.Add(this.cboCarModelNo);
			this.Controls.Add(this.lblCarPurchaseRate);
			this.Controls.Add(this.lblCarModelNumber);
			this.Name = "frmSellcar";
			this.ShowInTaskbar = false;
			this.Text = "销售汽车";
			this.Load += new System.EventHandler(this.Sellcar_Load);
			this.ResumeLayout(false);

		}
		#endregion
		
		private void Sellcar_Load(object sender, System.EventArgs e)
		{
			
			string filename = "d:\\CarMasterRecord.txt";
			objCarDetails = new Hashtable();
			try
			{
				fstream = File.Open(filename,FileMode.Open,FileAccess.Read);
			}
			catch(FileNotFoundException ex)
			{
				MessageBox.Show(ex.Message.ToString());
			}

			breader = new BinaryReader(fstream);
			
			//read masterrecord file and load ComboBox with model numbers
			try
			{
				while(true)
				{
					modelNum = breader.ReadString();
					purchaseRate = breader.ReadDouble();
					objCarDetails.Add(modelNum,purchaseRate);
							
				}
			}
			catch(EndOfStreamException ex)
			{
				MessageBox.Show("到达流末尾");
			}
		
			foreach(DictionaryEntry car in objCarDetails)
			{
				this.cboCarModelNo.Items.Add(car.Key); 
			}

			fstream.Close();
			filename = "D:\\CarSaleRecord.txt";			
			try
			{
				fstream = File.Open(filename,FileMode.OpenOrCreate,FileAccess.ReadWrite);
			}
			catch(FileNotFoundException ex)
			{
				MessageBox.Show(ex.Message.ToString());
			}
			bwriter = new BinaryWriter(fstream);
		
		}

		//display purchase rate depends on model number selected
		private void cboCarModelNo_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			foreach(DictionaryEntry car in objCarDetails)
			{
				if(string.Compare(car.Key.ToString(),cboCarModelNo.SelectedItem.ToString(),false)==0)
					this.lblCarPurchaseRateDetail.Text = car.Value.ToString();
			}

		}

		private void btnExit_Click(object sender, System.EventArgs e)
		{
			breader.Close();
			fstream.Close();
			this.Close();
		}
		//Add the details of sold car into file CarSaleRecord.txt
		private void btnSell_Click(object sender, System.EventArgs e)
		{
			for(int i=0; i<this.txtCarSaleRate.Text.Length; i++)
			{
				if(!Char.IsNumber(txtCarSaleRate.Text.ToString(),i))
				{
					MessageBox.Show("价格应为数字");
					return;
					break;
				}
			}
			if(this.txtCarSaleRate.Text != string.Empty)
			{
				purchaseRate = Double.Parse(this.lblCarPurchaseRateDetail.Text);
				saleRate = Double.Parse(this.txtCarSaleRate.Text);
				
				bwriter.Write(this.cboCarModelNo.SelectedItem.ToString());
				bwriter.Write(purchaseRate);
				bwriter.Write(saleRate);
			}
			else
				MessageBox.Show("提供完整的数据");

			this.txtCarSaleRate.Clear();
			this.Close();
		}
	}
}