[英]How can we set source of data binding to this in xaml?
如何在xaml中编写这个表达式?
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
。 我想将Source设置为这个。
提前致谢 :)
编辑:
这是我简单的用户控件:
<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。
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>
你应该在XAML中这样做:
<TextBlock Id="TextBlock1" Text="{Binding Tooltip}"/>
在您的代码(Constructor / UserControl_Loaded)中,您应该:
TextBlock1.DataContext = this;
您还可能需要在属性集中实现INotifyPropertyChanged
和Raise OnPropertyChanged
事件
你为什么不想在代码中这样做?
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