黑马程序员+Winform基础(下)

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13.练习：修改密码
        /// <summary>

/// 修改密码

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void button1_Click(object sender, EventArgs e)

{

string oldPwd = txtoldpwd.Text.Trim();

string newPwd1= txtnewpwd1.Text.Trim();

string newPwd2 = txtnewpwd2.Text.Trim();

if (oldPwd.Equals("888888"))

{

if (newPwd1.Equals(oldPwd))

{

MessageBox.Show("新密码与旧密码一样，重新输入！");

txtnewpwd1.Text = "";

}

else if (newPwd1.Equals(newPwd2))

{

MessageBox.Show("修改成功！");

}

else

{

MessageBox.Show("两次输入的新密码不一致！");

txtnewpwd1.Text = "";

txtnewpwd2.Text = "";

}

}

else

{

MessageBox.Show("旧密码不正确！");

txtoldpwd.Text = "";

txtnewpwd1.Text = "";

txtnewpwd2.Text = "";

}

}

13  练习：
         /// <summary>

/// 统计ListBox中的最高得分者的姓名和分数

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void btnresult_Click(object sender, EventArgs e)

{

string[] lines= txtScore.Lines;

int maxScore=-1;

string maxName = "";

for (int i = 0; i < lines.Length; i++)

{

string[] str=lines[i].Split('=');

string name = str[0];//姓名

string strScore = str[1];//分数

int score = Convert.ToInt32(strScore);

if (score>maxScore)

{//更新最大成绩学员的姓名和分数

maxName = name;

maxScore = score;

}

}

MessageBox.Show(string.Format("最高得分者是{0},得分为{1}",maxName,maxScore));

}

14 练习：
         /// <summary>

/// 四则运算

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void button1_Click(object sender, EventArgs e)

{

string num1 = txtNum1.Text.Trim();

string num2 = txtNum2.Text.Trim();

int i1, i2;

//转换成int

if (!int.TryParse(num1,out i1))

{

MessageBox.Show("第一个数不合法");

txtNum1.Text = "";

}

else if (!int.TryParse(num2,out i2))

{

MessageBox.Show("第二个数不合法");

txtNum2.Text = "";

}

else

{

switch (cbOper.SelectedIndex)

{

case 0: //+

MessageBox.Show(string.Format("{0}+{1}={2}", i1, i2, i1 + i2));

break;

case 1: //-

MessageBox.Show(string.Format("{0}-{1}={2}", i1, i2, i1 - i2));

break;

case 2: //*

MessageBox.Show(string.Format("{0}*{1}={2}", i1, i2, i1 *i2));

break;

case 3: // /

if (i2==0)

{

MessageBox.Show(string.Format("第二个数不能为0"));

}

else

{

MessageBox.Show(string.Format("{0}/{1}={2}", i1, i2, i1 / i2));

}

break;

default:

throw new Exception("不合法运算符");

}

}

}

15练习：
        /// <summary>

/// 省市选择关联器

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void cbCity_SelectedIndexChanged(object sender, EventArgs e)

{

List<string> list = new List<string>();

string[] anhui = {"合肥","安庆","蚌埠" };

string[] guangdong = { "广州","深圳" };

string[] shanghai = { "场圃" };

cbCountry.Items.Clear();//清空之前数据

switch (cbCity.SelectedIndex)

{

case 0: //安徽

cbCountry.Items.AddRange(anhui);

break;

case 1: //广东

cbCountry.Items.AddRange(guangdong);

break;

case 2: //上海

cbCountry.Items.AddRange(shanghai);

break;

default:

break;

}

}

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