WPF+MVVM基础登录

做一个超市通信息管理系统，用WPF来做。搭了登录页面
这里登录直接获取数据库的登录，如果没有用户，就新增用户，如果有用户那进行判断和比对账号和密码是否正确，正确登录成功，错误登录失败。
View层代码：
登录按钮和关闭按钮都是重写的。

<!--用户名的下拉框-->
   <Border Grid.Row="2" Grid.Column="1" Grid.ColumnSpan="4" BorderBrush="#FF00B4FF" BorderThickness="1.4" CornerRadius="4" Margin="0,5,6,5">
     <DockPanel>
         <Image Source="Images\Login\Login06.png" Margin="10 10 6 8"/>
         <Image Source="Images\Login\Login14.png" Width="2" Margin="5"/>
         <ComboBox x:Name="BtnName" IsEditable="True" DisplayMemberPath="LoginName" 
Width="238" Height="30" HorizontalAlignment="Center" Margin="0,2,0,1"
Style="{StaticResource LoginComboBox_Style}" VerticalAlignment="Center" 
VerticalContentAlignment="Center" HorizontalContentAlignment="Left" 
BorderThickness="0" ItemsSource="{Binding CombboxList}"  
SelectedItem="{Binding LoginModel}" Padding="10,7.5,0,0"
Text="{Binding LoginModel.LoginName,UpdateSourceTrigger=PropertyChanged,
Mode=TwoWay}"/>
     </DockPanel>
</Border>
<!--密码框-->
<Border Grid.Row="3" Grid.Column="1" Grid.ColumnSpan="4" BorderBrush="#FF989CA1" BorderThickness="1" CornerRadius="4" Margin="0,5,6,5">
   <DockPanel>
       <Image Source="Images\Login\Login13.png" Margin="12 10 5.5 8"/>
       <Image Source="Images\Login\Login16.png" Width="2" Margin="5"/>
       <PasswordBox x:Name="BtnPassword" BorderThickness="0" Width="238" Height="30" 
VerticalAlignment="Center" HorizontalAlignment="Center" MaxLength="16"
                VerticalContentAlignment="Center" HorizontalContentAlignment="Left" 
BorderBrush="Transparent" passwordbox:PassWordHelper.Attach="True" 
Padding="0,0,0,0" passwordbox:PassWordHelper.Password="{Binding 
LoginModel.Password,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}"/>
        </DockPanel>
</Border>
<!--记住密码-->
<CheckBox x:Name="CboRememberPassword" IsChecked="{Binding 
LoginModel.RememberPassword,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}"  
Grid.Row="4" Grid.Column="1" Grid.ColumnSpan="2" VerticalAlignment="Center" 
BorderBrush="#00A0E8" Foreground="#898989" Height="20" Content="记 住 密 码" 
Style="{StaticResource ChackboxFontStyle}" FontSize="13"/> 
<!--登录按钮-->
   <local:ButtonEx Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="2" Content="登 录"
ButtonType="LoginButton" Foreground="#00a2ff" x:Name="BtnLogin" Width="130"
HorizontalAlignment="Left" VerticalAlignment="Center" FontSize="16" 
BorderBrush="#00a2ff" BorderThickness="0.2" Command="{Binding SubmitCmd}"
FontFamily="{StaticResource YaHeiLight}"Click="BtnLogin_Click" Height="40" 
Margin="0,1"/>
<!--关闭按钮-->
   <local:ButtonEx Grid.Column="3" Grid.Row="5" Grid.ColumnSpan="2" x:Name="BtnExit" 
Content="关 闭" ButtonType="LoginButton" Foreground="#00a2ff" FontSize="16"
HorizontalAlignment="Right" VerticalAlignment="Center" BorderBrush="#00a2ff" 
BorderThickness="0.2" Click="BtnExit_Click" Height="40" Width="130"  
Margin="0,1,6,1" FontFamily="微软雅黑" Command="{Binding SubmitCmd}"/>

Model层代码：
主要存放登录数据

private string loginName;
        public string LoginName
        {
            get  { return loginName; }
            set{
                loginName = value;
                RaisePropertyChanged(() => LoginName);
            }
        }
        ///<summary>
        /// 密码
        /// </summary>
        private string password;
        public string Password
        {
            get{return password; }
            set{
                password = value;
                RaisePropertyChanged(() => Password);
            }
        }
        ///<summary>
        /// 记住密码
        /// </summary>
        private bool rememberPassword;
        public bool RememberPassword
        {
            get{return rememberPassword; }
            set{
                rememberPassword = value;
                RaisePropertyChanged(() => RememberPassword);
            }
        }

Viewmodel层代码：
这里只有判断登录代码和新增登录代码，其他的代码，就不一一写出来了，包过变量。

///登录判断
        public void Login(string msg)
        {try{
            if (loginModel.LoginName != null && loginModel.Password != null)
             {
               string Password = EncryptionDecryption.MD5Encrypt(loginModel.Password, 
DataCenterManager.KEY_PASSWORD_STRING);
               DataTable User = 
DBManager.Default.UserDbo.SelectUserAccount(loginModel.LoginName);
                    if (User.Rows.Count > 0)
                    {
                        if (loginModel.LoginName == 
User.Rows[0]["userAccount"].ToString().Trim() && Password 
== User.Rows[0]["userPassword"].ToString().Trim())
                        {
                            Messenger.Default.Send<string>(loginModel.LoginName, 
MessageCenter.MSG_LOGIN_SUCCESS);
                            Messenger.Default.Send<string>(loginModel.LoginName, 
MessageCenter.MSG_LOGIN_USERACCOUNT);
                            SaveUsersSettings();
                        }else{
                            msg = "账号密码错误";
                            Messenger.Default.Send<string>(msg,
MessageCenter.MSG_LOGIN_FAILD);
                        }
                    }else{
                        msg = "账号密码不存在";
                        Messenger.Default.Send<string>(msg,
 MessageCenter.MSG_LOGIN_FAILD);
                    }
                }else{
                    if (loginModel.LoginName == null)
                    { msg = "请输入账号";}
                    else if (loginModel.Password == null)
                    {msg = "请输入密码";}
                    Messenger.Default.Send<string>(msg, MessageCenter.MSG_LOGIN_FAILD);
                }
            }
            catch (Exception)
            {
                msg = "账号或密码为空";
                Messenger.Default.Send<string>(msg, MessageCenter.MSG_LOGIN_FAILD);
            } 
        } 
        /// <summary>
        /// 保存登录信息
        /// </summary>
        private void SaveUsersSettings()
        {
           string Password = EncryptionDecryption.MD5Encrypt(loginModel.Password,
 DataCenterManager.KEY_PASSWORD_STRING);
            if (Properties.Settings.Default.users.Contains(loginModel.LoginName))
            {
                int index = Properties.Settings.Default.users.IndexOf
(loginModel.LoginName);
                Properties.Settings.Default.users.RemoveAt(index);
                Properties.Settings.Default.pwds.RemoveAt(index);
            }
            Properties.Settings.Default.users.Insert(0, loginModel.LoginName);
            if (loginModel.RememberPassword)
            {
                Properties.Settings.Default.pwds.Insert(0, Password);
            }else{
Properties.Settings.Default.pwds.Insert(0, "");}
            Properties.Settings.Default.Save();
        }

登录页面

标签：LoginName,MVVM,登录,Default,loginModel,msg,WPF,Password
来源： https://blog.csdn.net/weixin_44548814/article/details/112761739