Question

如何在xaml中编写此表达式？

 Binding binding = new Binding("Logo");
            binding.Source = this;
            binding.Converter = new ToImageConverter();
            imgLogo.SetBinding(Image.SourceProperty, binding);

请注意，我不想在xaml.cs中设置DataContext = this。我想把Source设置为这个。

提前致谢：）

修改

这是我的简单用户控件：

<UserControl x:Class="SilverlightApplication4.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White">
        <TextBlock Text="{Binding Tooltip, RelativeSource={RelativeSource Self}}"/>
    </Grid>
</UserControl>

这是我的cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SilverlightApplication4
{
    public partial class MainPage : UserControl
    {
        public static readonly DependencyProperty ToolTipProperty
       = DependencyProperty.Register("ToolTip", typeof(string), typeof(MainPage),
           new PropertyMetadata(string.Empty));

        public string Tooltip
        {
            get { return GetValue(ToolTipProperty) as string; }
            set { SetValue(ToolTipProperty, value); }
        }

        public MainPage()
        {
            InitializeComponent();
            this.Loaded += new RoutedEventHandler(MainPage_Loaded);
        }

        void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            Tooltip = "Test tooltip.";
        }
    }
}

绑定不起作用。

Answer 1

尝试使用“{Binding Logo，RelativeSource = {RelativeSource Self}}”（为清晰起见，省略了转换器）。

编辑：根据您更新的代码，您需要：

<UserControl x:Class="SilverlightApplication4.MainPage"
    x:Name=MyUserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White">
        <TextBlock Text="{Binding Tooltip, ElementName=MyUserControl}"/>
    </Grid>
</UserControl>

Answer 2

您应该在XAML中执行此操作：

<TextBlock Id="TextBlock1" Text="{Binding Tooltip}"/>

并在您的代码（Constructor / UserControl_Loaded）中，您应该：

TextBlock1.DataContext = this;

您可能还需要实施INotifyPropertyChanged 并在属性集中提升OnPropertyChanged事件

为什么不想在代码中执行此操作？

我们如何在xaml中设置绑定到此的数据源？

2 个答案: