form1.cs

表达式解析组件

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using ArithMetic;
 
namespace TestArithmetic
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.TextBox textBox2;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Button button3;

		private Parser P;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.label1 = new System.Windows.Forms.Label();
			this.button1 = new System.Windows.Forms.Button();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.label2 = new System.Windows.Forms.Label();
			this.textBox2 = new System.Windows.Forms.TextBox();
			this.button2 = new System.Windows.Forms.Button();
			this.button3 = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(20, 33);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(67, 16);
			this.label1.TabIndex = 0;
			this.label1.Text = "Expression";
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(104, 122);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(96, 31);
			this.button1.TabIndex = 1;
			this.button1.Text = "Evalute";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// textBox1
			// 
			this.textBox1.Location = new System.Drawing.Point(97, 31);
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new System.Drawing.Size(293, 21);
			this.textBox1.TabIndex = 2;
			this.textBox1.Text = "textBox1";
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(20, 77);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(51, 16);
			this.label2.TabIndex = 3;
			this.label2.Text = "Result";
			// 
			// textBox2
			// 
			this.textBox2.Location = new System.Drawing.Point(98, 75);
			this.textBox2.Name = "textBox2";
			this.textBox2.Size = new System.Drawing.Size(184, 21);
			this.textBox2.TabIndex = 4;
			this.textBox2.Text = "textBox2";
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(292, 177);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(96, 31);
			this.button2.TabIndex = 5;
			this.button2.Text = "Close";
			this.button2.Click += new System.EventHandler(this.button2_Click);
			// 
			// button3
			// 
			this.button3.Location = new System.Drawing.Point(291, 122);
			this.button3.Name = "button3";
			this.button3.Size = new System.Drawing.Size(96, 31);
			this.button3.TabIndex = 6;
			this.button3.Text = "Clear";
			this.button3.Click += new System.EventHandler(this.button3_Click);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(452, 237);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.button3,
																		  this.button2,
																		  this.textBox2,
																		  this.label2,
																		  this.textBox1,
																		  this.button1,
																		  this.label1});
			this.Name = "Form1";
			this.Text = "测试Arithmetic.dll";
			this.Load += new System.EventHandler(this.Form1_Load);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			try
			{
				textBox2.Text = (P.Evaluate(textBox1.Text)).ToString(); 
			}
			catch
			{
				textBox2.Text = "";
			}
		}

		private void button2_Click(object sender, System.EventArgs e)
		{
			this.Close(); 
		}

		private void Form1_Load(object sender, System.EventArgs e)
		{
			textBox1.Text = "";
			textBox2.Text = "";
			P = new Parser();
			P.OnError += new ErrorHandler(OnError); 
			P.CustomFunction += new FunctionHandler(CustomFunction); 
			P.AddCustomFunction("AREA",1); 
		}
		private void OnError(object s,ArithMetic.ErrorEventArgs e)
		{
			MessageBox.Show("Expression:" + e.Expression +"\n" + e.ErrorMessage);
		}

		private void button3_Click(object sender, System.EventArgs e)
		{
			textBox1.Text = "";
			textBox2.Text = "";
		}
		private void CustomFunction(object s,ArithMetic.FunctionEventArgs e)
		{
			object ret;
			if(e.FunctionName == "AREA")
			{
				double r = P.GetDoubleParameter(0);
				ret = Math.PI * r * r;
				P.CFSetResult(ret);
			}
		}
	}
}