Question

这似乎很容易。我一直在做一些更完整的数据绑定，现在我无法让这个简单的测试工作。我究竟做错了什么？

免责声明：经过漫长的一周后，周五晚了。

这是我的XAML文件：

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" x:Name="MainWindowControl"
        xmlns:diag="clr-namespace:System.Diagnostics;assembly=WindowsBase">
    <Grid>
        <TextBlock DataContext="{Binding ElementName=MainWindowControl, Path=Test, diag:PresentationTraceSources.TraceLevel=High}" />
    </Grid>
</Window>

代码隐藏：

using System.Windows;

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private string _test = "testing 1..2..3";
        public string Test { get { return _test; } set { _test = value; } }

        public MainWindow()
        {
            InitializeComponent();
        }
    }
}

最后显示它的调试输出工作正常。但事实并非如此！

System.Windows.Data Warning: 56 : Created BindingExpression (hash=24898218) for Binding (hash=15584387)
System.Windows.Data Warning: 58 :   Path: 'Test'
System.Windows.Data Warning: 60 : BindingExpression (hash=24898218): Default mode resolved to OneWay
System.Windows.Data Warning: 61 : BindingExpression (hash=24898218): Default update trigger resolved to PropertyChanged
System.Windows.Data Warning: 62 : BindingExpression (hash=24898218): Attach to System.Windows.Controls.TextBlock.DataContext (hash=61116530)
System.Windows.Data Warning: 67 : BindingExpression (hash=24898218): Resolving source 
System.Windows.Data Warning: 70 : BindingExpression (hash=24898218): Found data context element: <null> (OK)
System.Windows.Data Warning: 74 :     Lookup name MainWindowControl:  queried TextBlock (hash=61116530)
System.Windows.Data Warning: 78 : BindingExpression (hash=24898218): Activate with root item MainWindow (hash=22749765)
System.Windows.Data Warning: 108 : BindingExpression (hash=24898218):   At level 0 - for MainWindow.Test found accessor RuntimePropertyInfo(Test)
System.Windows.Data Warning: 104 : BindingExpression (hash=24898218): Replace item at level 0 with MainWindow (hash=22749765), using accessor RuntimePropertyInfo(Test)
System.Windows.Data Warning: 101 : BindingExpression (hash=24898218): GetValue at level 0 from MainWindow (hash=22749765) using RuntimePropertyInfo(Test): 'testing 1..2..3'
System.Windows.Data Warning: 80 : BindingExpression (hash=24898218): TransferValue - got raw value 'testing 1..2..3'
System.Windows.Data Warning: 89 : BindingExpression (hash=24898218): TransferValue - using final value 'testing 1..2..3'

Answer 1

您将字符串属性绑定到DataContext的{{1}}。它正常运作。我只能猜测，但你的意思是绑定到TextBlock的{{1}}属性，这样你才能看到文字出现？

Text

Answer 2

您应该将datacontext设置为codebehind。

using System.Windows;
namespace WpfApplication1
 {
    /// <summary>    
    /// Interaction logic for MainWindow.xaml    
    /// </summary>

    public partial class MainWindow : Window
    {
        private string _test = "testing 1..2..3";    
        public string Test { get { return _test; } set { _test = value; } }

        public MainWindow()
        {
            InitializeComponent();
            this.Loaded+=(s,a)=>
             {
                this.DataContext=Test;
             };
        }
    }
}

为什么我的WPF绑定工作不正常？

2 个答案: