【C#】上机实验七

、开发一个窗体应用程序，窗体上能接收华氏温度或者摄氏温度，点击相应按钮可以相互转换。
要求转换后的华氏温度或者摄氏温度保留小数点后3位，程序中要有异常处理结构。

　　　　　　　　

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;

 namespace Myform1
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         private void label1_Click(object sender, EventArgs e)
         {

         }

         private void button1_Click(object sender, EventArgs e)
         {
             try
             {
                 textBox2.Text = htc(textBox1.Text).ToString("f3");
             }
             catch (Exception ex)
             {
                 Text = ex.Message;
             }
         }

         private void button2_Click(object sender, EventArgs e)
         {
             try
             {
                 textBox1.Text = cth(textBox2.Text).ToString("f3");
             }
             catch (Exception ex)
             {
                 Text = ex.Message;
             }
         }

         public double htc( double x ){
             return (x - ) *  / ;
         }

         public double htc(string s)
         {
             double x = double.Parse(s);
             return (x - ) *  / ;
         }

         public double cth(double x)
         {
             return (x *  / ) + ;
         }
         public double cth(string s)
         {
             double x = double.Parse(s);
             return (x *  / ) + ;
         }

     }
 }

温度转换

---

、设计一个窗体应用程序，输入一个字符，判定此字符是数字、大写字母、小写字母，还是其它字符。
要求：
（）类中定义公有方法（判断字符归属）
（）在按钮单击事件中调用该方法及返回值完成判断。
（）程序中要有异常处理结构。

　　　　　　

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;

 namespace Myproject2
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         private void button1_Click(object sender, EventArgs e)
         {
             string s = textBox1.Text;
             if (s.Length > )
             {
                 Text = "请输入一个字符";
                 textBox1.Text = "";
                 textBox2.Text = "";
                 MessageBox.Show("请输入一个字符", "Warming", MessageBoxButtons.OK);
             }

             if( s.Length ==  )
             try
             {
                 char ch = s[];
                 if ('a' <= ch && ch <= 'z') {
                     textBox2.Text = "小写字母";
                 }
                 else if ('A' <= ch && ch <= 'Z') {
                     textBox2.Text = "大写字母";
                 }
                 else if ('' <= ch && ch <= '')
                 {
                     textBox2.Text = "数字";
                 }
                 else {
                     textBox2.Text = "其他字符";
                 }
             }
             catch (Exception ex)
             {
                 Text = ex.Message;
             }
         }

         private void button2_Click(object sender, EventArgs e)
         {
             textBox1.Text = "";
             textBox2.Text = "";
         }

     }
 }

判断字符

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、开发一个窗体应用程序，可以根据圆的半径计算圆的面积。具体要求如下：
（）设计一个方法求圆的面积。
（）求圆面积的方法要定义成重载方法，既能接收整形参数，也能接收单精度类型参数。
（）程序中要有异常处理结构。

　　　　

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;

 namespace Myproject3
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         private void button1_Click(object sender, EventArgs e)
         {
             string str = textBox1.Text;
             double d = ;
             int x = ;
             bool Is_int = false;
             bool Is_double = false;

             if (Is_int = int.TryParse(str, out x)){}
             else if ( Is_double = double.TryParse(str, out d)){}

             if (Is_int || Is_double)
             {
                 try
                 {
                     if (Is_int)
                     {
                         textBox2.Text = (Math.PI * x * x).ToString("f2");
                     }
                     else
                     {
                         textBox2.Text = (Math.PI * d * d).ToString("f2");
                     }

                 }
                 catch (Exception ex)
                 {
                     Text = ex.Message;
                 }
             }
             else
             {
                 MessageBox.Show("请输入数字", "Warning", MessageBoxButtons.OK);
                 textBox1.Text = textBox2.Text = "";

             }
         }
     }
 }

求圆的面积

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、设计一个窗体应用程序，练习最基本的控件使用，实现单选按钮、复选按钮和命令按钮的相关功能。

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;

 namespace Myproject4
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         private void groupBox1_Enter(object sender, EventArgs e)
         {

         }
         private FontFamily fontFamily = new FontFamily("宋体");
         private FontStyle Style = FontStyle.Regular;
         private float Size =  ;
         private void radioButton1_CheckedChanged(object sender, EventArgs e)
         {
             fontFamily = new FontFamily("黑体");
             textBox1.Font = new Font(fontFamily, Size, Style);
         }

         private void radioButton2_CheckedChanged(object sender, EventArgs e)
         {
             fontFamily = new FontFamily("楷体");
             textBox1.Font = new Font(fontFamily, Size, Style);
         }

         private void checkBox1_CheckedChanged(object sender, EventArgs e)
         {
             Style ^= FontStyle.Bold;
             textBox1.Font = new Font(fontFamily, Size, Style);
         }

         private void checkBox2_CheckedChanged(object sender, EventArgs e)
         {
             Style ^= FontStyle.Italic;
             textBox1.Font = new Font(fontFamily, Size, Style);
         }

         private void radioButton4_CheckedChanged(object sender, EventArgs e)
         {
             Size = ;
             textBox1.Font = new Font(fontFamily, Size, Style);
         }

         private void radioButton3_CheckedChanged(object sender, EventArgs e)
         {
             Size = ;
             textBox1.Font = new Font(fontFamily, Size, Style);
         }

         private void radioButton6_CheckedChanged(object sender, EventArgs e)
         {
             textBox1.ForeColor = Color.Red;
         }

         private void radioButton5_CheckedChanged(object sender, EventArgs e)
         {
             textBox1.ForeColor = Color.Blue ;
         }

         private void button1_Click(object sender, EventArgs e)
         {
             textBox1.Copy();
         }

         private void button2_Click(object sender, EventArgs e)
         {
             textBox1.Cut();
         }

         private void button3_Click(object sender, EventArgs e)
         {
             textBox1.Paste();
         }

         private void button4_Click(object sender, EventArgs e)
         {
             textBox1.Undo();
         }

     }
 }

记事本