WPF 用户控件依赖属性值

发布于 2024-12-10 01:25:54 字数 1701 浏览 1 评论 0原文

我有以下问题：我在 WPF 中创建了一个 UserControl，它有一个 ContractID 属性。我需要在另一个UserControl中调用这个UserControl，并且在调用它时我需要为其提供一个AgreementID。现在我在第一个 UserControl 中创建了 DependencyProperty，但它不起作用。

这是我的第一个UserControl的代码：

public partial class UC1001_AgreementDetails_View : UserControl
    {

        private UC1001_ActiveAgreementContract _contract;
        private int _agreementID;

        public int AgreementID
        {
            get { return _agreementID; }
            set { _agreementID = value; }
        }

        public UC1001_AgreementDetails_View()
        {
            InitializeComponent();
        }

       public static readonly DependencyProperty AgreementIDProperty = DependencyProperty.Register("AgreementID", typeof(int), typeof(UC1001_AgreementDetails_View), new PropertyMetadata(null));

这是我调用以前的UserControl的XAML：

 <DataGridTextColumn.ElementStyle>
            <Style TargetType="{x:Type TextBlock}">
            <!--<Setter Property="Text" Value="{Binding Months[9].AgreementID}"/>-->
            <Setter Property="Tag" Value="{Binding Months[9].AgreementID}"/>
            <Setter Property="Background" Value="White" />
            <Setter Property="DataGridCell.ToolTip">
                 <Setter.Value>
                     <my:UC1001_AgreementDetails_View Background="#FFF" Opacity="0.88" AgreementID="{Binding Months[9].AgreementID}"/>
                 </Setter.Value>
            </Setter>

所以我想将那个月的AgreementID传递到第一个UserControl上，但是当我检查它时，传递的值总是0，但它应该是 3。我检查了 Months[9].AgreementID 值，确实是 3。所以我在绑定中得到了正确的值，但它没有正确传递。

我希望您能清楚我的问题，如果需要，可以提供其他信息！

原文

I have the following problem: I made a UserControl in WPF which has an AgreementID property. I need to call this UserControl in another UserControl, and I need to give an AgreementID with it when I call it. Now I made a DependencyProperty in the first UserControl, but it does not work.

This is the code of my first UserControl:

public partial class UC1001_AgreementDetails_View : UserControl
    {

        private UC1001_ActiveAgreementContract _contract;
        private int _agreementID;

        public int AgreementID
        {
            get { return _agreementID; }
            set { _agreementID = value; }
        }

        public UC1001_AgreementDetails_View()
        {
            InitializeComponent();
        }

       public static readonly DependencyProperty AgreementIDProperty = DependencyProperty.Register("AgreementID", typeof(int), typeof(UC1001_AgreementDetails_View), new PropertyMetadata(null));

This is the XAML where I call previous UserControl:

 <DataGridTextColumn.ElementStyle>
            <Style TargetType="{x:Type TextBlock}">
            <!--<Setter Property="Text" Value="{Binding Months[9].AgreementID}"/>-->
            <Setter Property="Tag" Value="{Binding Months[9].AgreementID}"/>
            <Setter Property="Background" Value="White" />
            <Setter Property="DataGridCell.ToolTip">
                 <Setter.Value>
                     <my:UC1001_AgreementDetails_View Background="#FFF" Opacity="0.88" AgreementID="{Binding Months[9].AgreementID}"/>
                 </Setter.Value>
            </Setter>

So I want to pas the AgreementID of that month onto the first UserControl, but when I check it, the passed value is always 0, but it should be 3. I checked the Months[9].AgreementID value and it was 3 indeed. So I get the right value in the binding, but it's not passing through right.

I hope my problem is a bit clear to you, additional information can be given if wanted!

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白首有我共你 2024-12-17 01:25:54

您错误地定义了依赖属性的属性外观。在属性定义中，您需要处理依赖属性并设置和返回其值：

public int AgreementID
{
    get { return (int) GetValue(AgreementIDProperty ); }
    set { SetValue(AgreementIDProperty, value); }
}

You are defining the Property facade for the Dependency Property wrong. In your property definition, you need to work on the Dependency Property and set and return its value:

public int AgreementID
{
    get { return (int) GetValue(AgreementIDProperty ); }
    set { SetValue(AgreementIDProperty, value); }
}

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骷髅 2024-12-17 01:25:54

如前所述，您的属性包装器应该在依赖项属性上调用 GetValue 和 SetValue（并且您可以省去支持字段）。不过，值得指出的是，当直接在 XAML 中或通过声明性 Binding 设置 DependencyProperty 时，将绕过包装器属性。因此，如果您实际上使用 GetValue 检查 DependencyProperty 本身的值，那么您会看到该值实际上是由您的 设置的绑定。这是通过程序代码中的包装器检索属性值失败的原因，因为它没有访问 DependencyProperty。