想用C#做点东西,请高手指点下

hejianbo1985 2007-10-11 09:24:01

学了C#已经快1个月了,想做点实际的东西,请各位告诉我一些题目以及主要实现的功能.
不管谁只要说了一个题目以及一些详细的东西的,都给10分以上的分.谢谢!!!!!!!

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wuyi8808 2007-10-11

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计算表达式的代码用的是“银河”的代码（VB版）：
http://www.cnblogs.com/skyivben/archive/2005/10/31/265861.html

// VBExpression.cs - 动态生成数学表达式并计算其值

// 表达式使用 Visual Baisc 语法，可带一个的自变量(x)

// 可使用 pi、e 等常量，sin、cos、tan、log、sqrt 等函数

// 例子：e + sqrt(log(pi ^ e) * x) + sin(x * pi / 180)



using System;

using System.CodeDom.Compiler;

using Microsoft.VisualBasic;

using System.Reflection;

using System.Text;

using System.Globalization;



namespace Skyiv.Util

{

  sealed class Expression

  {

    object instance;

    MethodInfo method;



    public Expression(string expression)

    {

      if (expression.ToUpper(CultureInfo.InvariantCulture).IndexOf("RETURN") < 0) expression = "Return " + expression;

      string className = "Expression";

      string methodName = "Compute";

      CompilerParameters p = new CompilerParameters();

      p.GenerateInMemory = true;

      CompilerResults cr = new VBCodeProvider().CompileAssemblyFromSource

      (

        p,

        string.Format

        (

          @"Option Explicit Off

          Option Strict Off

          Imports System, System.Math, Microsoft.VisualBasic

          NotInheritable Class {0}

          Public Function {1}(x As Double) As Double

          {2}

          End Function

          End Class",

          className, methodName, expression

        )

      );

      if(cr.Errors.Count > 0)

      {

        string msg = "Expression(\"" + expression + "\"): \n";

        foreach (CompilerError err in cr.Errors) msg += err.ToString() + "\n";

        throw new Exception(msg);

      }

      instance = cr.CompiledAssembly.CreateInstance(className);

      method = instance.GetType().GetMethod(methodName);

    }



    public double Compute(double x)

    {

      return (double)method.Invoke(instance, new object [] { x });

    }

  }

}

wuyi8808 2007-10-11

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// Calc.cs - 表达式计算器

// 编译方法: csc /t:winexe Calc.cs VBExpression.cs



using System;

using System.Windows.Forms;

using Skyiv.Util;



namespace Skyiv

{

  class Calc : Form

  {

    TextBox tbxA1, tbxA2, tbxA3;



    Calc()

    {

      Text              = "表达式计算器";

      StartPosition     = FormStartPosition.CenterScreen;

      Width             = 400;

      Height            = 200;



      Label lblA1       = new Label();

      lblA1.Text        = "表达式(&E)";

      lblA1.Parent      = this;

      lblA1.Top         = 23;

      lblA1.Left        = 10;

      lblA1.AutoSize    = true;



      tbxA1             = new TextBox();

      tbxA1.Parent      = this;

      tbxA1.Top         = 20;

      tbxA1.Left        = 80;

      tbxA1.Width       = 300;

      tbxA1.BorderStyle = BorderStyle.FixedSingle;



      Label lblA2       = new Label();

      lblA2.Text        = "自变量(&X)";

      lblA2.Parent      = this;

      lblA2.Top         = 48;

      lblA2.Left        = 10;

      lblA2.AutoSize    = true;



      tbxA2             = new TextBox();

      tbxA2.Parent      = this;

      tbxA2.Top         = 45;

      tbxA2.Left        = 80;

      tbxA2.Width       = 300;

      tbxA2.BorderStyle = BorderStyle.FixedSingle;



      Button btnA3      = new Button();

      btnA3.Text        = "计算(&C)";

      btnA3.Parent      = this;

      btnA3.Top         = 70;

      btnA3.Left        = 10;

      btnA3.Width       = 62;

      btnA3.Click      += new EventHandler(Calc_Clicked);



      tbxA3             = new TextBox();

      tbxA3.Parent      = this;

      tbxA3.Top         = 70;

      tbxA3.Left        = 80;

      tbxA3.Width       = 300;

      tbxA3.BorderStyle = BorderStyle.FixedSingle;

      tbxA3.ReadOnly    = true;





      TextBox tbxA4     = new TextBox();

      tbxA4.Text        = @"

表达式使用 Visual Baisc 语法，可带一个的自变量(x)

可使用 pi、e 等常量，sin、cos、tan、log、sqrt 等函数

例子：x * cos(x * pi / sqrt(25 * 6^4)) + log(E^10)";

      tbxA4.Parent      = this;

      tbxA4.Top         = 95;

      tbxA4.Left        = 10;

      tbxA4.Width       = 370;

      tbxA4.Height      = 65;

      tbxA4.BorderStyle = BorderStyle.None;

      tbxA4.Multiline   = true;

      tbxA4.ReadOnly    = true;

    }



    void Calc_Clicked(object sender, EventArgs ea)

    {

      (sender as Control).Enabled = false;

      try

      {

        double x = 0;

        if (tbxA2.Text.Trim().Length != 0)

        {

          try

          {

            x = double.Parse(tbxA2.Text);

          }

          catch

          {

            try

            {

              x = (new Expression(tbxA2.Text)).Compute(0);

            }

            catch (Exception ex)

            {

              MessageBox.Show(ex.Message, "自变量出错");

            }

          }

        }

        tbxA3.Text = (new Expression(tbxA1.Text)).Compute(x).ToString();

      }

      catch (Exception ex)

      {

        MessageBox.Show(ex.Message, "表达式出错");

      }

      finally

      {

        (sender as Control).Enabled = true;

      }

    }



    [STAThread]

    static void Main(string [] args)

    {

      Application.Run(new Calc());

    }

  }

}