如何从自定义用户控件 WPF、C# 中的枚举自定义属性获取值？

Question

我正在创建一个简单的用户控件，它具有 3 个自定义属性：其中两个工作正常，但我对第三个枚举进行了故障排除。我的用户控件是一个组合框，它显示与数据库的连接（MySql、Sql 服务器...），我想显示全部、MySql 或 SqlServer由于 TypeOfDatabase 属性.

等连接

我的问题是我的 TypeOfDatabase 属性等于 BaseConnection.xaml.cs 开关中的“全部”，因此我不能只有 MySql 个连接。

我是 WPF 的新手，我不知道我必须做什么才能获取值集。

我希望你能解释我做错了什么并给我一个解决方案。提前致谢。

没有更多的文字，但我的代码会有所帮助...

我的用户控件：

BaseConnection.xaml

<UserControl x:Class="WpfCommonControls.Utils.UserControls.BaseConnection"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:WpfCommonControls.Utils.UserControls"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="400"
             x:Name="BaseConnectionUserControl">
    <UserControl.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Resources/UserControlsResources.en-EN.xaml"/>
                <ResourceDictionary Source="Resources/UserControlsResources.fr-FR.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </UserControl.Resources>
    <Grid>
        <StackPanel Orientation="Vertical">
            <Label x:Name="lbl_Connection_uc" Padding="0"
                   Content="{DynamicResource LabelBaseConnection}"/>
            <ComboBox x:Name="cbbox_Connections_uc" Margin="0 5 5 0"
                      ItemsSource="{Binding ElementName=BaseConnectionUserControl, Path=UcConnectionList}"
                      SelectedValuePath="Name"
                      SelectedValue="{Binding ElementName=BaseConnectionUserControl, Path=UcConnectionName, UpdateSourceTrigger=PropertyChanged}"
                      DisplayMemberPath="Name">
            </ComboBox>
        </StackPanel>
    </Grid>
</UserControl>

BaseConnection.xaml.cs

namespace WpfCommonControls.Utils.UserControls
{
    /// <summary>
    /// Interaction logic for BaseConnection.xaml
    /// </summary>
    public partial class BaseConnection : UserControl
    {

        #region Properties
        public static readonly DependencyProperty ConnectionNameProperty = DependencyProperty.Register("UcConnectionName", typeof(String), typeof(BaseConnection));

        public String UcConnectionName
        {
            get
            {
                return (String)GetValue(ConnectionNameProperty);
            }
            set
            {
                SetValue(ConnectionNameProperty, value);
            }
        }

        public static readonly DependencyProperty ConnectionListProperty = DependencyProperty.Register("UcConnectionList", typeof(List<UcConnection>), typeof(BaseConnection));

        public List<UcConnection> UcConnectionList
        {
            get
            {
                return (List<UcConnection>)GetValue(ConnectionListProperty);
            }
            set
            {
                SetValue(ConnectionListProperty, value);
            }
        }


        public static readonly DependencyProperty TypeOfDatabaseProperty = DependencyProperty.Register("TypeOfDatabase", typeof(DataBaseType), typeof(BaseConnection));

        public DataBaseType TypeOfDatabase
        {
            get
            {
                return (DataBaseType)GetValue(TypeOfDatabaseProperty);
            }
            set
            {
                SetValue(TypeOfDatabaseProperty, value);
            }
        }

        #endregion Properties

        #region Private Properties
        private String _languageCode = "en-EN";
        private CultureHelper _cultureHelper = new CultureHelper();
        private UcConnection _ucConnection = new UcConnection();
        #endregion Private Properties
        public BaseConnection()
        {
            InitializeComponent();
            _languageCode = Thread.CurrentThread.CurrentCulture.Name;
            this.Resources = _cultureHelper.FindRessourcesDictionnary(this.Resources, "UserControlsResources", _languageCode);
            List<UcConnection> connectionListByDatabaseType = new List<UcConnection>();
            switch (TypeOfDatabase)
            {
                case DataBaseType.MySql:
                    foreach (UcConnection ucConnection in UcConnectionList)
                    {
                        if (ucConnection.DriverName.ToLower().Contains("mysql"))
                        {
                            connectionListByDatabaseType.Add(ucConnection);
                        }
                    }
                    UcConnectionList = connectionListByDatabaseType;
                    
                    break;
                case DataBaseType.SqlServer:
                    break;
                default:
                    break;

            }
        }

        public BaseConnection(String connectionName, List<UcConnection> connections)
        {
            InitializeComponent();
            UcConnectionList = connections;
            connectionName = UcConnectionName;
            _languageCode = Thread.CurrentThread.CurrentCulture.Name;
            this.Resources = _cultureHelper.FindRessourcesDictionnary(this.Resources, "UserControlsResources", _languageCode);
        }
    }
}

我的枚举 UserControlEnum.cs

namespace WpfCommonControls.Utils.UserControls
{
    /// <summary>
    /// Enumeration for the databasetype to display in the base connection combobox
    /// </summary>
    public enum DataBaseType
    {
        [Description("All available connections")]
        All = 0,
        [Description("Only MySql connections")]
        MySql = 1,
        [Description("Only Sql server connections")]
        SqlServer = 2
    }
}

我的 UcConnection class UcConnection.cs

namespace WpfCommonControls.CommonClasses
{
    public class UcConnection
    {
        public String Name { get; set; }
        public String ServerName { get; set; }
        public String ServerPort { get; set; }
        public String DatabaseName { get; set; }
        public String UserName { get; set; }
        public String UserPassword { get; set; }
        public String DriverName { get; set; }

        public UcConnection()
        {

        }
        public UcConnection(String nameConnection, String serverName, String serverPort, String databaseName, String userName, String userPassword, String driverName)
        {
            Name = nameConnection;
            ServerName = serverName;
            ServerPort = serverPort;
            DatabaseName = databaseName;
            UserName = userName;
            UserPassword = userPassword;
            DriverName = driverName;
        }


        public List<UcConnection> UcConnections
        {
            get
            {
                return _UcConnections;
            }
            set
            {
                _UcConnections = value;
            }
        }

        private List<UcConnection> _UcConnections = new List<UcConnection>();
        public static UcConnection GetUcConnection(String name, List<UcConnection> connections)
        {
            UcConnection selectedConnection = new UcConnection();
            if (connections == null)
            {
                connections = new List<UcConnection>();
            }

            foreach (UcConnection cn in connections)
            {
                if (cn.Name == name)
                {
                    selectedConnection = cn;
                    break;
                }
            }

            return selectedConnection;
        }
    }

}

我如何在 window

中使用我的用户控件

xmlns:commonUserControls="clr-namespace:WpfCommonControls.Utils.UserControls;assembly=WpfCommonControls"

<commonUserControls:BaseConnection x:Name="uc_BaseConnection"
                                   UcConnectionList="{Binding Path=ConnectionList}"
                                   UcConnectionName="{Binding Path = ConnectionName, UpdateSourceTrigger = Explicit, Mode=TwoWay}"
                                   TypeOfDatabase="MySql"/>

在BaseConnection.xaml.cs中，我已经试过了，但没有解决问题

public static readonly DependencyProperty TypeOfDatabaseProperty = DependencyProperty.Register("TypeOfDatabase", typeof(DataBaseType), typeof(BaseConnection), new PropertyMetadata(DataBaseType.All, new PropertyChangedCallback(OnTypeOfDatabaseChanged)));

        private static void OnTypeOfDatabaseChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = (BaseConnection)d;
            control.TypeOfDatabase = (DataBaseType)e.NewValue;
        }

        public DataBaseType TypeOfDatabase
        {
            get
            {
                return (DataBaseType)GetValue(TypeOfDatabaseProperty);
            }
            set
            {
                SetValue(TypeOfDatabaseProperty, value);
            }
        }

Answer 1

首先，我不建议您在 DPChanged 回调中更改依赖项属性的值。然后你在构造函数中所做的你必须在 DPChanged 回调中做。

这应该有效：

public DataBaseType TypeOfDatabase
{
    get
    {
        return (DataBaseType)GetValue(TypeOfDatabaseProperty);
    }
    set
    {
        SetValue(TypeOfDatabaseProperty, value);
    }
}
public static readonly DependencyProperty TypeOfDatabaseProperty = DependencyProperty.Register(nameof(TypeOfDatabase), typeof(DataBaseType), typeof(BaseConnection), new PropertyMetadata(DataBaseType.All, new PropertyChangedCallback(OnTypeOfDatabaseChanged)));

private static void OnTypeOfDatabaseChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    var connectionListByDatabaseType = new List<UcConnection>();
    switch((DataBaseType)e.NewValue)
    {
        case DataBaseType.MySql:
            foreach(UcConnection ucConnection in UcConnectionList)
            {
                if(ucConnection.DriverName.ToLower().Contains("mysql"))
                {
                    connectionListByDatabaseType.Add(ucConnection);
                }
            }
            UcConnectionList = connectionListByDatabaseType;
            break;
        case DataBaseType.SqlServer:
            break;
        default:
            break;
    }
}

Answer 2

您在设置属性之前在构造函数中打开 TypeOfDatabase。

将 switch 语句移动到 OnTypeOfDatabaseChanged 回调或 Loaded 事件处理程序：

public BaseConnection()
{
    InitializeComponent();
    _languageCode = Thread.CurrentThread.CurrentCulture.Name;
    this.Resources = _cultureHelper.FindRessourcesDictionnary(this.Resources, "UserControlsResources", _languageCode);

    Loaded += OnLoaded;
}

private void OnLoaded(object sender, RoutedEventArgs e)
{
    List<UcConnection> connectionListByDatabaseType = new List<UcConnection>();
    switch (TypeOfDatabase)
    {
        case DataBaseType.MySql:
            foreach (UcConnection ucConnection in UcConnectionList)
            {
                if (ucConnection.DriverName.ToLower().Contains("mysql"))
                {
                    connectionListByDatabaseType.Add(ucConnection);
                }
            }
            UcConnectionList = connectionListByDatabaseType;

            break;
        case DataBaseType.SqlServer:
            break;
        default:
            break;

    }
}

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