如何从自定义用户控件 WPF、C# 中的枚举自定义属性中获取值？
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【中文标题】如何从自定义用户控件 WPF、C# 中的枚举自定义属性中获取值？【英文标题】：How to get the value from an enum custom property in custom usercontrol WPF,C#? 【发布时间】：2021-08-07 12:59:56 【问题描述】：我正在使用 3 个自定义属性创建一个简单的用户控件：其中两个可以正常工作，但我对第三个是枚举的问题进行了故障排除。 我的用户控件是一个组合框，它显示与数据库（mysql、Sql server...）的连接，并且由于 TypeOfDatabase 属性，我想显示所有连接、MySql、SqlServer 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 连接。
我是 WPF 的新手，我不知道如何获取值集。
我希望你能解释我做错了什么并给我一个解决方案。 感谢提前。
没有更多的文字，但我的代码会有所帮助......
我的用户控制：
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 课程 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;
我如何在窗口
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);
【问题讨论】：
【参考方案1】：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;
【讨论】：
非常感谢。我终于使用 Loaded 事件使用了您的答案，并且效果很好。要知道为什么我没有将开关放在回调中，请参阅我在 @Rekshino 的回答中的评论【参考方案2】：首先，我不建议您在 DPChanged 回调中更改依赖属性的值。然后你在构造函数中所做的，你必须在 DPChanged 回调中做。
这应该可行：
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;
【讨论】：
我尝试了您的解决方案，但我遇到了编译器错误 CS0120，即“非静态字段、方法或属性 BaseConnection.UcConnectionList 需要对象引用。因此我添加了这些行var control = (BaseConnection)d; control.TypeOfDatabase = (DataBaseType)e.NewValue; 和控制在 UcConnectionList (control.UcConnectionList) 之前，但是当我尝试运行应用程序时，我在 control.UcConnectionList 上有 System NullReference。实际上，UcConnectionList 是在 mywindow 加载事件上设置的。谢谢您的回答。以上是关于如何从自定义用户控件 WPF、C# 中的枚举自定义属性中获取值？的主要内容，如果未能解决你的问题，请参考以下文章
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