iot/labs/CameraCard/CameraCard/LoginForm.cs

using CameraCard.Data;
using System;
using System.Configuration;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Text;
using System.Threading;
using System.Web.Script.Serialization;
using System.Windows.Forms;

namespace CameraCard
{
    public partial class LoginForm : Form
    {
        private ProgressForm _progress;

        public LoginForm()
        {
            InitializeComponent();
            this.userNameValid.Text = "";
            this.passwordValid.Text = "";
        }

        private void LoginForm_Load(object sender, EventArgs e)
        {
            MyDbContext.Init();
        }

        private void login_Click(object sender, EventArgs e)
        {
            var valid = true;
            if (string.IsNullOrWhiteSpace(this.userNameInput.Text))
            {
                valid = false;
                this.userNameValid.Text = "用户名不能为空";
            }
            else
            {
                this.userNameValid.Text = "";
            }
            if (string.IsNullOrWhiteSpace(this.passwordInput.Text))
            {
                valid = false;
                this.passwordValid.Text = "用户名不能为空";
            }
            else
            {
                this.passwordValid.Text = "";
            }
            if (valid)
            {
                var userName = this.userNameInput.Text.Trim();
                var password = this.passwordInput.Text.Trim();
                using (var db = new MyDbContext())
                {
                    if (db.Users.Any())
                    {
                        var user = db.Users.FirstOrDefault(o => o.UserName == userName && o.Password == password);
                        if (user != null)
                        {
                            this._progress?.SetProgress("本地登录成功", 100);
                            MainForm.User = user;
                            this.Hide();
                            new MainForm().Show();
                        }
                        else
                        {
                            MessageBox.Show("用户名或密码错误");
                        }
                    }
                    else
                    {
                        this.BeginInvoke(new Action(() =>
                        {
                            this.LoginFromServer(userName, password);
                        }));
                    }
                }
            }
        }

        private void LoginFromServer(string userName, string password)
        {
            if (this._progress == null)
            {
                var thread = new Thread(() =>
                {
                    try
                    {
                        this._progress?.SetProgress("正在登录，请稍候", 30);
                        var url = ConfigurationManager.AppSettings["login"];
                        var client = HttpClientFactory.Create();
                        var content = new StringContent(new JavaScriptSerializer().Serialize(new { userName = userName, password = password }), Encoding.UTF8, "application/json");
                        var response = client.PostAsync(url, content).Result;
                        this._progress?.SetProgress("正在登录，请稍候", 50);
                        if (response.StatusCode == HttpStatusCode.OK)
                        {
                            var result = new JavaScriptSerializer().Deserialize<LoginResponse>(response.Content.ReadAsStringAsync().Result);
                            if (result.code == 0)
                            {
                                using (var db = new MyDbContext())
                                {
                                    var user = db.Users.FirstOrDefault(o => o.UserName == userName);
                                    if (user == null)
                                    {
                                        user = new User { UserName = userName, Password = password, PasswordHash = result.data };
                                        db.Users.Add(user);
                                    }
                                    else
                                    {
                                        user.Password = password;
                                        user.PasswordHash = result.data;
                                    }
                                    db.SaveChanges();
                                    MainForm.User = user;
                                }
                                this._progress?.SetProgress("登录成功，正在更新数据", 50);
                                MainForm.LoadData(this._progress);
                                this._progress?.SetProgress("数据更新完毕", 100);
                                this._progress.CloseProgress();
                                this.Invoke(new Action(() =>
                                {
                                    this.Hide();
                                    new MainForm().Show();
                                }));
                            }
                            else
                            {
                                MessageBox.Show($"错误代码：{result.code}，错误消息：{result.message}");
                                this._progress?.SetProgress("登录失败", 100);
                                this._progress.CloseProgress();
                            }
                        }
                        else
                        {
                            MessageBox.Show(response.Content.ReadAsStringAsync().Result);
                            this._progress?.SetProgress("登录失败", 100);
                            this._progress.CloseProgress();
                        }
                    }
                    catch (ThreadAbortException ex)
                    {
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                });
                this._progress = new ProgressForm("登录中", "正在登录，请稍候", 0, 100, this.Width, () =>
                {
                    this._progress = null;
                    if (thread != null && thread.IsAlive)
                    {
                        thread.Abort();
                    }
                });
                thread.Start();
                this._progress.ShowDialog();
            }
        }

        private void LoginForm_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                this.login_Click(sender, e);
            }
        }
    }
}