控件-2（C#）

àì夳堔傛蜴生んèń 2022-05-16 02:24 224阅读 0赞

**生日选择器**

![这里写图片描述][SouthEast]

private void Form1_Load(object sender, EventArgs e)
            {
                //获取当前年份
                int yearCmb = DateTime.Now.Year;            
    
                for (int i = yearCmb; i > 1949; i--)
                {
                    //添加年份
                    cmbYear.Items.Add(i+"年");
                }
            }
    
            private void cmbYear_SelectedIndexChanged(object sender, EventArgs e)
            {
                //清空原来添加的月份
                cmbMonth.Items.Clear();
    
                for (int i = 1; i <= 12; i++)
                {
                    //添加月份
                    cmbMonth.Items.Add(i + "月");
                }
            }
    
            private void cmbMonth_SelectedIndexChanged(object sender, EventArgs e)
            {
                cmbDay.Items.Clear();//清空这个控件的内容
    
                //获得当前年份
    
                //string year=cmbYear.Text.Substring(0, 4);//从此实例检索子字符串，子字符串从指定的字符位置开始且具有指定的长度
                string strYear = cmbYear.SelectedItem.ToString().Split('年')[0];//获取当前选定的项，拆分
    
                //获得当前月份
                string strMonth = cmbMonth.SelectedItem.ToString().Replace("月", "");//获取当前选定的项，替换
    
                int year = Convert.ToInt32(strYear);//把年份转换为int类型
                int month = Convert.ToInt32(strMonth);//把月份转换成int类型
    
                int day = 0;
    
                //二月份
                if (month==2)
                {
                    if (year%400==0||year%4==0&&year%100!=0)
                    {
                        day = 29;//瑞年二月29天
                    }
                    else
                    {
                        day = 28;//平年二月28天
                    }                
                }
    
                //其他月份
                else
                {
                    switch (month)
                    {
                        case 4:
                        case 6:
                        case 9:
                        case 11:
                            day = 30;
                            break;
                        default:
                            day = 31;
                            break;
                    }
                }
                for (int i = 1; i <= day; i++)
                {
                    cmbDay.Items.Add(i);
                }         
            }

**年满18，查看照片**

![这里写图片描述][SouthEast 1]

private void Form1_Load(object sender, EventArgs e)
            {
                //创建Image从指定文件
                pictureBox1.Image = Image.FromFile(@"C:\Users\景月娇\Desktop\img\果子77.jpg");
    
                //默认这个是隐藏的
                pictureBox1.Visible = false;
            }
    
            private void button1_Click(object sender, EventArgs e)
            {
                //号码长度为18位
                if (textBox1.Text.Length==18)
                {
                    //截取身份证号码的年份
                    string strNumber=textBox1.Text.Substring(6, 4);
                    //获取当前年份
                    int year1 = DateTime.Now.Year;
                    //将字符串类型的年份转换成int类型年份
                    int yearNumber = Convert.ToInt32(strNumber);
    
                    //大于18岁显示照片
                    if (year1-yearNumber>=18)
                    {
                        pictureBox1.Visible = true;
                    }
                    //小于18岁不显示照片
                    else
                    {
                        MessageBox.Show("未成年人");
                    }
                }
    
                //号码长度不是18位
                else
                {
                    MessageBox.Show("输入号码有误");
                }
                textBox1.Text.Substring(6, 4);
            }

**节点树控件**

![这里写图片描述][SouthEast 2]

private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
            {
                //获取树节点的标签中所显示的文本
                textBox4.Text=treeView1.SelectedNode.Text;
            }
    
            private void btnAdd_Click(object sender, EventArgs e)
            {
                string txt = textBox1.Text;
    
                //添加根节点
                treeView1.Nodes.Add(txt);
                textBox1.Text = "";
            }
    
            private void button1_Click(object sender, EventArgs e)
            {
                //获得当前节点
                TreeNode tn = treeView1.SelectedNode;
    
                //添加当前节点的子节点
                tn.Nodes.Add(textBox2.Text);
            }
    
            private void button2_Click(object sender, EventArgs e)
            {
                //修改当前节点
                treeView1.SelectedNode.Text = textBox3.Text;
                textBox3.Text = "";
            }
            private void button3_Click(object sender, EventArgs e)
            {
                //展开所有节点
                treeView1.ExpandAll();
            }
    
            private void button4_Click(object sender, EventArgs e)
            {
                //折叠所有节点
                treeView1.CollapseAll();
            }
    
            private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)
            {
                //获取已经选定的树节点
                TreeNode tn = e.Node;
    
                for (int i = 0; i < tn.Nodes.Count; i++)
                {
                    //子节点的选中状态等于父节点的选中状态
                    tn.Nodes[i].Checked = tn.Checked;
                }
                //树节点处于选中状态
                //if (tn.Checked ==true)
                //{ 
                // //遍历树的子节点都被选中
                // for (int i = 0; i < tn.Nodes.Count; i++)
                // { 
                // tn.Nodes[i].Checked = true;
                // }
                //}
                //树节点未处于选中状态
                //else
                //{ 
                    //遍历树的子节点都未被选中
                // for (int i = 0; i < tn.Nodes.Count; i++)
                // { 
                // tn.Nodes[i].Checked = false;
                // }
                //}
            }

[SouthEast]: /images/20220516/b8a67d2d4fa6492590aefd71fe8f6295.png
[SouthEast 1]: /images/20220516/e72f8e554980473f97b39f8a89435717.png
[SouthEast 2]: /images/20220516/0aa6e012866a49d0afa489f129cc6a91.png