黑马程序员+Winform基础(上)

黑马程序员+Winform基础

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  1. 控件:Button 按钮,TextBox 文本框, Label 标签,RadioButton 单选按钮,CheckButton 复选框 ,ListBox 列表框  ,PictureBox 图片框,ComboBox 下拉列表框
  2. 属性:Text:文本框中输入的值 ,Name:通过name来操作对象,Form.Text:窗体的标题,ForeColor:前景色,TextAlign:文本对齐,Image 图片,PasswordChar:密码文本 ,MultiLine 多行文本,Items 数据项,DropDownStyle:控制组合框的外观和功能,SelectItem 选中的项,SelectIndex 选中项的索引
  3. string.Format(“{0},你好”,textBox1.Text); //设置输出格式
  4. 方法:Form.Hide():对象隐藏,TextBox. AppendText()附加文本,
  5. 事件:Click:点击, SelectedIndexChanged 选择项发生改变

6.练习:求和
/// <summary>

/// 求和

/// </summary>

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

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

private void btnAdd_Click(object sender, EventArgs e)

{

string num1 = txtnum1.Text;

string num2 = txtnum2.Text;

int i1,i2;

if (!int.TryParse(num1,out i1))//转换成int

{

MessageBox.Show("第一个数不合法!");

txtnum1.Text = "";//数字不合法,清空文本框

}

            else if (int.TryParse(num2, out i2) == false)

{

MessageBox.Show("第二个数不合法!");

txtnum2.Text = "";

}

else

{//求和输出

txtsum.Text = (i1 + i2).ToString();

}

}

7. 练习:核对Email,分析出用户名和域名
/// <summary>

///       核对Email,分析出用户名和域名

/// </summary>

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

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

private void button1_Click(object sender, EventArgs e)

{

string email = txtEmail.Text;

string[] str = email.Split('@');

if (str.Length!=2)

{

MessageBox.Show("Email不合法");

txtEmail.Text = "";

}

else

{

MessageBox.Show(string.Format("用户名:{0} , 域名:{1}",str[0],str[1]));

}

}

8. 练习:两个数的累加
          /// <summary>

/// 累加

/// </summary>

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

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

private void button2_Click(object sender, EventArgs e)

{

string num1 = textBox1.Text;

string num2 = textBox2.Text;

int i1, i2,sum=0;

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

{

MessageBox.Show("第一个数非法");

textBox1.Text = "";

}

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

{

MessageBox.Show("第二个数非法");

textBox1.Text = "";

}

else

{ //判断

if (i1>=i2)

{

MessageBox.Show("第一个数必须小于第二个数");

textBox1.Text = "";

textBox2.Text = "";

}

else

{//累加

for (int i = i1; i <= i2; i++)

{

sum += i;

}

MessageBox.Show(string.Format("{0}累加到{1}和为{2}", i1, i2, sum));

}

}         

}

9 .练习:

/// <summary>

/// 查看图片(满18岁可查看)

/// </summary>

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

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

private void button5_Click(object sender, EventArgs e)

{

string id = textBox4.Text;

//验证输入的身份证是否合法

if (id.Length!=18)

{

MessageBox.Show("身份证输入不合法");

textBox4.Text = "";

}

else

{//判断是否成年

if (DateTime.Now.Year-Convert.ToInt32(id.Substring(6,4))>18)

{

pictureBox1.Visible = true;

}

else

{

pictureBox1.Visible = false;

MessageBox.Show("年龄太小!");

}

}

}

10.练习:
        /// <summary>

/// 向左移动

/// </summary>

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

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

private void button3_Click(object sender, EventArgs e)

{

string str = textBox3.Text;

this.textBox3.Text = str.Substring(1)+str.Substring(0,1);

}

/// <summary>

/// 向右移动

/// </summary>

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

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

private void button4_Click(object sender, EventArgs e)

{

string str = textBox3.Text;

this.textBox3.Text = str.Substring(str.Length-1)+str.Substring(0, str.Length - 1);

}

11.+=与appendText的区别
        /// <summary>

/// 附加文本

/// </summary>

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

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

private void button6_Click(object sender, EventArgs e)

{

//textBox5.Text += DateTime.Now+"\r\n";//用于数据量小

textBox5.AppendText(DateTime.Now.ToString()+"\n");//数据量大

}

12.练习:登录错三次不让再登录
              /// <summary>

/// 登录,失败超过3次后退出

/// </summary>

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

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

private  int errorTime = 0;

private void btnsubmit_Click(object sender, EventArgs e)

{

string userName = txtname.Text.Trim();

string pwd = txtpwd.Text.Trim();

if (userName.Equals("admin", StringComparison.OrdinalIgnoreCase)&&pwd.Equals("888888"))

{

MessageBox.Show("登录成功!");

}

else

{

errorTime++;//不能用局部变量,用类字段才可达到计数的功能

if (errorTime>=3)

{

MessageBox.Show("错误三次,不允许再登录!");

//this.Close();

Application.Exit();//退出程序

}

else

{

MessageBox.Show("登录失败!");

}

}

}

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