一.创建一个用于登录的Login的复合控件
1.右击项目文件,点击添加用户控件,设置为控件名为Login。
2.拉动两个lable控件,两个textBox控件,一个button,一个CheckBox控件。
3.将控件的权限(Modifiers)设置为Public。
二.将控件CheckBox与textBox2(显示密码的textBox)的控件绑定点击事件。
private void checkBox1_CheckedChanged(object sender, EventArgs e){if (checkBox1.Checked) {textBox2.PasswordChar = '\0';}else { textBox2.PasswordChar = '*'; }}
三.重新生成项目,点击工具箱打开,打开自定义控件Login拖入到Form1中,添加listBox控件。
四.为Login的button控件添加自定义的点击事件。(注意设置Login中的button控件权限为公开)
五.给Form1窗口添加ContextMenuStrip菜单栏,里面设置一个删除的选项
六.为listBox添加点击事件
private void listBox1_MouseDown(object sender, MouseEventArgs e){if (e.Button == MouseButtons.Right){if (listBox1.SelectedItems.Count != 0){删除ToolStripMenuItem.Enabled = true;}else{删除ToolStripMenuItem.Enabled = false;}this.contextMenuStrip1.Show(listBox1, e.Location);}}
七.为删除按钮添加点击事件
private void 删除ToolStripMenuItem_Click(object sender, EventArgs e){listBox1.Items.Remove(listBox1.SelectedItem);string str = JsonConvert.SerializeObject(listBox1.Items, Formatting.Indented);File.WriteAllText("登陆日志.txt", str);listBox1.ClearSelected();}
八.总代码
using Newtonsoft.Json; using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.IO; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms;namespace winform对json数据的存储和读取 {public partial class Form1 : Form{public Form1(){InitializeComponent();login1.button1.Click += new EventHandler (this.A);}private void A(object sender, EventArgs e) {if (login1.textBox1.Text != "" && login1.textBox2.Text != "") {listBox1.Items.Add(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss ") + login1.textBox1.Text+"登陆了此页面");string str = JsonConvert.SerializeObject(listBox1.Items, Formatting.Indented);File.WriteAllText("登陆日志.txt",str);}else { MessageBox.Show("账号密码不能为空"); }}private void 删除ToolStripMenuItem_Click(object sender, EventArgs e){listBox1.Items.Remove(listBox1.SelectedItem);string str = JsonConvert.SerializeObject(listBox1.Items, Formatting.Indented);File.WriteAllText("登陆日志.txt", str);listBox1.ClearSelected();}private void listBox1_MouseDown(object sender, MouseEventArgs e){if (e.Button == MouseButtons.Right){if (listBox1.SelectedItems.Count != 0){删除ToolStripMenuItem.Enabled = true;}else{删除ToolStripMenuItem.Enabled = false;}this.contextMenuStrip1.Show(listBox1, e.Location);}}} }