frmpurchaseitem.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.Data;

namespace Example_3
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class frmPurchaseItem : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label lblProductCode;
		private System.Windows.Forms.Label lblProductName;
		private System.Windows.Forms.Label lblProductRate;
		private System.Windows.Forms.Label lblUnits;
		private System.Windows.Forms.TextBox txtProductCode;
		private System.Windows.Forms.TextBox txtProductName;
		private System.Windows.Forms.TextBox txtUnits;
		private System.Windows.Forms.TextBox txtProductRate;
		private System.Windows.Forms.Label lblTotalPrice;
		private System.Windows.Forms.TextBox txtTotalPrice;
		private System.Windows.Forms.Button btnCalculate;
		private System.Windows.Forms.Button btnExit;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public frmPurchaseItem()
		{
			//
			// 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.lblProductCode = new System.Windows.Forms.Label();
			this.lblProductName = new System.Windows.Forms.Label();
			this.lblProductRate = new System.Windows.Forms.Label();
			this.lblUnits = new System.Windows.Forms.Label();
			this.txtProductCode = new System.Windows.Forms.TextBox();
			this.txtProductName = new System.Windows.Forms.TextBox();
			this.txtUnits = new System.Windows.Forms.TextBox();
			this.txtProductRate = new System.Windows.Forms.TextBox();
			this.lblTotalPrice = new System.Windows.Forms.Label();
			this.txtTotalPrice = new System.Windows.Forms.TextBox();
			this.btnCalculate = new System.Windows.Forms.Button();
			this.btnExit = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// lblProductCode
			// 
			this.lblProductCode.Location = new System.Drawing.Point(8, 16);
			this.lblProductCode.Name = "lblProductCode";
			this.lblProductCode.Size = new System.Drawing.Size(80, 23);
			this.lblProductCode.TabIndex = 0;
			this.lblProductCode.Text = "产品代码：";
			// 
			// lblProductName
			// 
			this.lblProductName.Location = new System.Drawing.Point(8, 48);
			this.lblProductName.Name = "lblProductName";
			this.lblProductName.Size = new System.Drawing.Size(80, 23);
			this.lblProductName.TabIndex = 1;
			this.lblProductName.Text = "产品名称：";
			// 
			// lblProductRate
			// 
			this.lblProductRate.Location = new System.Drawing.Point(8, 80);
			this.lblProductRate.Name = "lblProductRate";
			this.lblProductRate.Size = new System.Drawing.Size(64, 23);
			this.lblProductRate.TabIndex = 2;
			this.lblProductRate.Text = "价格：";
			// 
			// lblUnits
			// 
			this.lblUnits.Location = new System.Drawing.Point(8, 112);
			this.lblUnits.Name = "lblUnits";
			this.lblUnits.Size = new System.Drawing.Size(64, 23);
			this.lblUnits.TabIndex = 3;
			this.lblUnits.Text = "单位：";
			// 
			// txtProductCode
			// 
			this.txtProductCode.Location = new System.Drawing.Point(88, 16);
			this.txtProductCode.Name = "txtProductCode";
			this.txtProductCode.TabIndex = 4;
			this.txtProductCode.Text = "";
			this.txtProductCode.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txtProductCode_KeyPress);
			// 
			// txtProductName
			// 
			this.txtProductName.Location = new System.Drawing.Point(88, 48);
			this.txtProductName.Name = "txtProductName";
			this.txtProductName.TabIndex = 5;
			this.txtProductName.Text = "";
			// 
			// txtUnits
			// 
			this.txtUnits.Location = new System.Drawing.Point(88, 112);
			this.txtUnits.Name = "txtUnits";
			this.txtUnits.TabIndex = 6;
			this.txtUnits.Text = "";
			// 
			// txtProductRate
			// 
			this.txtProductRate.Location = new System.Drawing.Point(88, 80);
			this.txtProductRate.Name = "txtProductRate";
			this.txtProductRate.TabIndex = 7;
			this.txtProductRate.Text = "";
			// 
			// lblTotalPrice
			// 
			this.lblTotalPrice.Location = new System.Drawing.Point(8, 144);
			this.lblTotalPrice.Name = "lblTotalPrice";
			this.lblTotalPrice.Size = new System.Drawing.Size(64, 23);
			this.lblTotalPrice.TabIndex = 3;
			this.lblTotalPrice.Text = "总价：";
			// 
			// txtTotalPrice
			// 
			this.txtTotalPrice.Enabled = false;
			this.txtTotalPrice.Location = new System.Drawing.Point(88, 144);
			this.txtTotalPrice.Name = "txtTotalPrice";
			this.txtTotalPrice.TabIndex = 6;
			this.txtTotalPrice.Text = "";
			// 
			// btnCalculate
			// 
			this.btnCalculate.Location = new System.Drawing.Point(32, 184);
			this.btnCalculate.Name = "btnCalculate";
			this.btnCalculate.TabIndex = 8;
			this.btnCalculate.Text = "计算 (&C)";
			this.btnCalculate.Click += new System.EventHandler(this.btnCalculate_Click);
			// 
			// btnExit
			// 
			this.btnExit.Location = new System.Drawing.Point(112, 184);
			this.btnExit.Name = "btnExit";
			this.btnExit.TabIndex = 9;
			this.btnExit.Text = "退出 (&X)";
			this.btnExit.Click += new System.EventHandler(this.btnExit_Click);
			// 
			// frmPurchaseItem
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(216, 213);
			this.Controls.Add(this.btnExit);
			this.Controls.Add(this.btnCalculate);
			this.Controls.Add(this.txtProductRate);
			this.Controls.Add(this.txtUnits);
			this.Controls.Add(this.txtProductName);
			this.Controls.Add(this.txtProductCode);
			this.Controls.Add(this.lblUnits);
			this.Controls.Add(this.lblProductRate);
			this.Controls.Add(this.lblProductName);
			this.Controls.Add(this.lblProductCode);
			this.Controls.Add(this.lblTotalPrice);
			this.Controls.Add(this.txtTotalPrice);
			this.Font = new System.Drawing.Font("Times New Roman", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.Name = "frmPurchaseItem";
			this.Text = "购买商品";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new frmPurchaseItem());
		}

		private void btnCalculate_Click(object sender, System.EventArgs e)
		{
			try
			{
				if(this.txtProductRate.Text.Trim() == string.Empty || this.txtUnits.Text.Trim() == string.Empty)
					throw new ExceptionClass("缺少字段值");
				else
					this.txtTotalPrice.Text = Convert.ToString(Convert.ToDouble(this.txtProductRate.Text) * Convert.ToDouble(this.txtUnits.Text));

			}
			catch(ExceptionClass ex)
			{
				MessageBox.Show(ex.Message);
			}
			catch(Exception ex)
			{
				MessageBox.Show(ex.Message);
			}
		}
		private void txtProductCode_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
		{
			try
			{
				//只接受 0-9 和退格键  
				e.Handled = e.KeyChar < '0' || e.KeyChar > '9'; 
				if(e.KeyChar == (char)8)
					e.Handled=false;
				
				//引发异常
				if(e.Handled == true)
					throw new ExceptionClass("此字段中只能输入数字");
			}
			////捕获此异常
			catch(ExceptionClass ex)
			{
				MessageBox.Show(ex.Message);
			}
		}
		
		private void btnExit_Click(object sender, System.EventArgs e)
		{
			this.Close();
		}
	}	
}