【C#】上机实验七

1、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 - 32) * 5 / 9; 
        }

        public double htc(string s)
        {
            double x = double.Parse(s);
            return (x - 32) * 5 / 9;
        }

        public double cth(double x) 
        {
            return (x * 9 / 5) + 32;
        }
        public double cth(string s)
        {
            double x = double.Parse(s);
            return (x * 9 / 5) + 32;
        }

    }
}

---

2、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：
（1）类中定义公有方法（判断字符归属）
（2）在按钮单击事件中调用该方法及返回值完成判断。
（3）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 > 1) 
            {
                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 == 1 )
            try
            {
                char ch = s[0];
                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 ('0' <= ch && ch <= '9')
                {
                    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 = "";
        }

    }
}

---

3、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：
（1）设计一个方法求圆的面积。
（2）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。
（3）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 = 0;
            int x = 0;
            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 = "";

            }
        }
    }
}

---

4、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 = 10 ;
        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 = 15;
            textBox1.Font = new Font(fontFamily, Size, Style);
        }

        private void radioButton3_CheckedChanged(object sender, EventArgs e)
        {
            Size = 30;
            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();
        }

    }
}