張亮的博客園

黑馬程序員+Winform基礎

 

1. 控件：Button 按鈕，TextBox 文本框， Label 標簽，RadioButton 單選按鈕，CheckButton 復選框 ，ListBox 列表框  ，PictureBox 圖片框，ComboBox 下拉列表框
2. 屬性：Text：文本框中輸入的值 ,Name:通過name來操作對象，F(xiàn)orm.Text:窗體的標題，F(xiàn)oreColor:前景色，TextAlign:文本對齊，Image 圖片，PasswordChar:密碼文本 ，MultiLine 多行文本，Items 數(shù)據(jù)項，DropDownStyle:控制組合框的外觀和功能，SelectItem 選中的項，SelectIndex 選中項的索引
3. string.Format(“{0},你好”，textBox1.Text); //設置輸出格式
4. 方法：Form.Hide():對象隱藏,TextBox. AppendText()附加文本，
5. 事件：Click:點擊, SelectedIndexChanged 選擇項發(fā)生改變

6．練習：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))//轉換成int

            {

                MessageBox.Show("第一個數(shù)不合法！");

                txtnum1.Text = "";//數(shù)字不合法，清空文本框

            }

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

            {

                MessageBox.Show("第二個數(shù)不合法！");

                txtnum2.Text = "";

            }

            else

            {//求和輸出

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

            }

        }

7. 練習：核對Email，分析出用戶名和域名
/// <summary>

        ///       核對Email，分析出用戶名和域名

        /// </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("用戶名：{0} , 域名：{1}",str[0],str[1]));

            }

        }

8. 練習：兩個數(shù)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("第一個數(shù)非法");

                textBox1.Text = "";

            }

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

            {

                MessageBox.Show("第二個數(shù)非法");

                textBox1.Text = "";

            }

            else

            { //判斷

                if (i1>=i2)

                {

                    MessageBox.Show("第一個數(shù)必須小于第二個數(shù)");

                    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}和為{2}", i1, i2, sum));

                }               

            }         

           

        }

 

9 .練習：

          /// <summary>

        /// 查看圖片（滿18歲可查看）

        /// </summary>

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

        /// <param name="e"></param>

        private void button5_Click(object sender, EventArgs e)

        {

            string id = textBox4.Text;

            //驗證輸入的身份證是否合法

            if (id.Length!=18)

            {

                MessageBox.Show("身份證輸入不合法");

                textBox4.Text = "";

            }

            else 

            {//判斷是否成年

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

                {

                    pictureBox1.Visible = true;

                }

                else

                {

pictureBox1.Visible = false;

                    MessageBox.Show("年齡太小！");

                }

            }

        }

 

 

10.練習：
        /// <summary>

        /// 向左移動

        /// </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>

        /// 向右移動

        /// </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.+=與appendText的區(qū)別
        /// <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";//用于數(shù)據(jù)量小

            textBox5.AppendText(DateTime.Now.ToString()+"\n");//數(shù)據(jù)量大

        }

12．練習：登錄錯三次不讓再登錄
              /// <summary>

            /// 登錄，失敗超過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("登錄成功！");

            }

            else

            {

                errorTime++;//不能用局部變量，用類字段才可達到計數(shù)的功能

                if (errorTime>=3)

                {

                    MessageBox.Show("錯誤三次，不允許再登錄！");

                    //this.Close();

                    Application.Exit();//退出程序

                }

                else

                {

                    MessageBox.Show("登錄失敗！");

                }

            }

        }