为什么我看到“成员无法识别或无法访问"?我的 WPF 用户控件出错?

问题描述

我有一个自定义用户控件，其中包含一个我希望能够在 XAML 中设置的公共属性.就在下面.

I've got a custom user control with a public property that I'd like to be able to set in XAML. Here it is below.

TestControl.xaml

<UserControl x:Class="Scale.Controls.TestControl"
         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"
         mc:Ignorable="d"
         d:DesignHeight="300" d:DesignWidth="300">

TestControl.xaml.cs

using System.Windows.Controls;

namespace MyProject.Controls
{
    public partial class TestControl : UserControl
    {
        public string TestMe { get; set; }
        public TestControl()
        {
            InitializeComponent();
        }
    }
}

然后，在我的 MainWindow.xaml 文件中，我尝试包含以下内容:

Then, in my MainWindow.xaml file, I try to include this:

<controls:TestControl TestMe="asdf" />

但是，即使 Visual Studio 自动完成 TestMe 属性，我也会看到带有波浪线下划线的内容，上面写着成员Test Me"无法识别或无法访问，如下所示.

However, even though Visual Studio autocompletes the TestMe property, I then see things with a squiggly underline that says "The member "Test Me" is not recognized or is not accessible," as seen below.

我可以发誓我以前在其他项目中做过这样的事情.如何通过这样的 XAML 访问(即设置)公共属性?

I could have sworn I've done something like this before in other projects. How can I access (i.e. set) the public properties via XAML like this?

推荐答案

您需要将您的属性声明为 Dependency Properties

You need to declare your property as Dependency Properties

namespace MyProject.Controls
{
    public partial class TestControl : UserControl
    {
        //Register Dependency Property

        public static readonly DependencyProperty TestMeDependency = DependencyProperty.Register("MyProperty", typeof(string), typeof(TestControl));

        public string MyCar
        {
            get
            {

                return (string)GetValue(TestMeDependency);

            }
            set
            {
                SetValue(TestMeDependency, value);
            }
        }

        public TestControl()
        {
            InitializeComponent();
        }
    }
}

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