TreeNode递归
递归:自己调用自己一层一层的把数据找出来
TreeNode:可以创建多个节点
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 + " | ";}
邮箱验证(往邮箱里发验证码)
首先要引用命名空间
using System.Net; using System.Net.Mail;
然后在按钮里面写点击事件或者在别的里面写点击事件也可以
//创建一个空的字符串string a = "";private void skinButton1_Click(object sender, EventArgs e){//创建服务器对象SmtpClient smt = new SmtpClient("这里是域名");
//创建发件人对象MailAddress my = new MailAddress("这里是发件人的邮箱");
//创建收件人对象MailAddress you = new MailAddress("这里是收件人的邮箱");
//创建邮件的对象,构造函数中传入发件人和收件人MailMessage mail = new MailMessage(my, you);//最后扔进这里面去
//设置邮箱标题mail.Subject = "这是标题";
//创建随机验证码string a1 = "abcdefghigklmnopqrstuvwxyzABCDEFGHIKIMNOPQRSTUVWXYZ0123456789";Random b = new Random();for (int i = 0; i <= 4; i++){a += a1.Substring(b.Next(0, a1.Length), 1);}
//设置邮箱内容mail.Body = "验证码为:" + a;
//创建互联网安全证书 NetworkCredential nwcd = new NetworkCredential("发件人邮箱", "发件人邮箱的密码");
//将证书绑定到服务器对象上,服务器验证smt.Credentials = nwcd;
//发送验证码 smt.Send(mail);
//判断是否能走到这个地方,走到了就表示发送成功MessageBox.Show("发送成功!");}private void skinButton2_Click(object sender, EventArgs e){//利用第二个TextBox判断是否输入的验证码正确if (skinTextBox2.Text == a){MessageBox.Show("验证成功");}else{MessageBox.Show("失败");}}
Timer控件
可以在用户点击完获取验证码之后开启倒计时
private void timer1_Tick(object sender, EventArgs e){time--;button2.Text = "发送(" + time.ToString() + ")";if (time <= 0){button2.Text = "发送";button2.Enabled = true;timer1.Enabled = false;}}
新用户窗体
直接在解决方案下添加用户窗体即可,注:用户窗体里面的Designer.cs组件设计器生成的代码下面的private一定要改成pubilc
剩下的直接调用即可.
