TreeNode遞歸

遞歸:自己調用自己一層一層的把數據找出來

TreeNode:可以創建多個節點

  private void button1_Click(object sender, EventArgs e)
        {
            dataBind("0001", treeView1.Nodes);
        }

        public void dataBind(string code, TreeNodeCollection tnc)
        {
            foreach (ChinaStates cs in list)
            {
                
 
if (cs.ParentAreaCode == code)
                {
                    TreeNode tn = new TreeNode(cs.AreaName);
                    tn.Tag = cs.AreaCode;

                    dataBind(cs.AreaCode, tn.Nodes);

                    tnc.Add(tn);
                }
            }
        }

        string tname = ""
 
;

        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
            tname = "";
            getData(treeView1.SelectedNode);
            MessageBox.Show(tname.Substring(0, tname.Length - 3));
        }

        public void getData(TreeNode tn)
        {
            
 
if (tn.Parent != null)
            {
                getData(tn.Parent);
            }
            tname += tn.Text + " | ";
        }

郵箱驗證(往郵箱裏發驗證碼)

首先要引用命名空間

using System.Net;
using System.Net.Mail;

然後在按鈕裏面寫點擊事件或者在別的裏面寫點擊事件也可以

        //創建一個空的字符串
        string a = "";
        private void skinButton1_Click(object sender, EventArgs e)
        {
            //創建服務器對象
            SmtpClient smt = new SmtpClient("這裏是域名");

            //創建發件人對象
            MailAddress my = new MailAddress("這裏是發件人的郵箱");

            //創建收件人對象
            MailAddress you = new MailAddress("這裏是收件人的郵箱");

            //創建郵件的對象,構造函數中傳入發件人和收件人
            MailMessage mail = new MailMessage(my, you);//最後扔進這裏面去

            //設置郵箱標題
            mail.Subject = "這是標題";

            //創建隨機驗證碼
            string a1 = "abcdefghigklmnopqrstuvwxyzABCDEFGHIKIMNOPQRSTUVWXYZ0123456789";
            Random b = new Random();
            for (int i = 0; i <= 4; i++)
            {
                a += a1.Substring(b.Next(0, a1.Length), 1);
            }

            //設置郵箱內容
            mail.Body = "驗證碼為:" + a;

            //創建互聯網安全證書 
            NetworkCredential nwcd = new NetworkCredential("發件人郵箱", "發件人郵箱的密碼");

            //將證書綁定到服務器對象上,服務器驗證
            smt.Credentials = nwcd;

            //發送驗證碼
            smt.Send(mail);

            //判斷是否能走到這個地方,走到了就表示發送成功
            MessageBox.Show("發送成功!");
        }

        private void skinButton2_Click(object sender, EventArgs e)
        {

            //利用第二個TextBox判斷是否輸入的驗證碼正確
            if (skinTextBox2.Text == a)
            {
                MessageBox.Show("驗證成功");
            }
            else
            {
                MessageBox.Show("失敗");
            }
        }

Timer控件

可以在用戶點擊完獲取驗證碼之後開啟倒計時

 private void timer1_Tick(object sender, EventArgs e)
        {
            time--;
            button2.Text = "發送(" + time.ToString() + ")";

            if (time <= 0)
            {
                button2.Text = "發送";
                button2.Enabled = true;
                timer1.Enabled = false;
            }
        }

新用戶窗體

直接在解決方案下添加用戶窗體即可,註:用戶窗體裏面的Designer.cs組件設計器生成的代碼下面的private一定要改成pubilc

剩下的直接調用即可.

2017年11月30日 C#TreeNode遞歸&郵箱驗證&新用戶窗體