databind WPF中WebBrowser的Source属性
本文关键字:Source 属性 WebBrowser WPF databind | 更新日期: 2023-09-27 17:48:48
有人知道如何在WPF(3.5SP1)中数据绑定WebBrowser的.Source属性吗?我有一个列表视图,我想在左边有一个小的WebBrowser,在右边有内容,并将每个WebBrowser的源与绑定到列表项的每个对象中的URI进行数据绑定。
到目前为止,这是我的概念证明,但"<WebBrowser Source="{Binding Path=WebAddress}"
"没有编译。
<DataTemplate x:Key="dealerLocatorLayout" DataType="DealerLocatorAddress">
<StackPanel Orientation="Horizontal">
<!--Web Control Here-->
<WebBrowser Source="{Binding Path=WebAddress}"
ScrollViewer.HorizontalScrollBarVisibility="Disabled"
ScrollViewer.VerticalScrollBarVisibility="Disabled"
Width="300"
Height="200"
/>
<StackPanel Orientation="Vertical">
<StackPanel Orientation="Horizontal">
<Label Content="{Binding Path=CompanyName}" FontWeight="Bold" Foreground="Blue" />
<TextBox Text="{Binding Path=DisplayName}" FontWeight="Bold" />
</StackPanel>
<TextBox Text="{Binding Path=Street[0]}" />
<TextBox Text="{Binding Path=Street[1]}" />
<TextBox Text="{Binding Path=PhoneNumber}"/>
<TextBox Text="{Binding Path=FaxNumber}"/>
<TextBox Text="{Binding Path=Email}"/>
<TextBox Text="{Binding Path=WebAddress}"/>
</StackPanel>
</StackPanel>
</DataTemplate>
问题是WebBrowser.Source
不是DependencyProperty
。一种变通方法是使用一些AttachedProperty
魔法来启用此功能。
public static class WebBrowserUtility
{
public static readonly DependencyProperty BindableSourceProperty =
DependencyProperty.RegisterAttached("BindableSource", typeof(string), typeof(WebBrowserUtility), new UIPropertyMetadata(null, BindableSourcePropertyChanged));
public static string GetBindableSource(DependencyObject obj)
{
return (string) obj.GetValue(BindableSourceProperty);
}
public static void SetBindableSource(DependencyObject obj, string value)
{
obj.SetValue(BindableSourceProperty, value);
}
public static void BindableSourcePropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
WebBrowser browser = o as WebBrowser;
if (browser != null)
{
string uri = e.NewValue as string;
browser.Source = !String.IsNullOrEmpty(uri) ? new Uri(uri) : null;
}
}
}
然后在你的xaml do:
<WebBrowser ns:WebBrowserUtility.BindableSource="{Binding WebAddress}"/>
我编写了一个包装器用户控件,它利用了DependencyProperty:
XAML:
<UserControl x:Class="HtmlBox">
<WebBrowser x:Name="browser" />
</UserControl>
C#:
public static readonly DependencyProperty HtmlTextProperty = DependencyProperty.Register("HtmlText", typeof(string), typeof(HtmlBox));
public string HtmlText {
get { return (string)GetValue(HtmlTextProperty); }
set { SetValue(HtmlTextProperty, value); }
}
protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e) {
base.OnPropertyChanged(e);
if (e.Property == HtmlTextProperty) {
DoBrowse();
}
}
private void DoBrowse() {
if (!string.IsNullOrEmpty(HtmlText)) {
browser.NavigateToString(HtmlText);
}
}
并像这样使用:
<Controls:HtmlBox HtmlText="{Binding MyHtml}" />
这个唯一的问题是WebBrowser控件不是"纯"wpf。。。它实际上只是一个win32组件的包装器。这意味着控件将不尊重z索引,并且将始终覆盖其他元素(例如:在滚动查看器中,这可能会引起一些麻烦)MSDN 上有关这些win32 wpf问题的更多信息
我对Todd的优秀答案进行了一点修改,以生成一个处理绑定源中字符串或Uris的版本:
public static class WebBrowserBehaviors
{
public static readonly DependencyProperty BindableSourceProperty =
DependencyProperty.RegisterAttached("BindableSource", typeof(object), typeof(WebBrowserBehaviors), new UIPropertyMetadata(null, BindableSourcePropertyChanged));
public static object GetBindableSource(DependencyObject obj)
{
return (string)obj.GetValue(BindableSourceProperty);
}
public static void SetBindableSource(DependencyObject obj, object value)
{
obj.SetValue(BindableSourceProperty, value);
}
public static void BindableSourcePropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
WebBrowser browser = o as WebBrowser;
if (browser == null) return;
Uri uri = null;
if (e.NewValue is string )
{
var uriString = e.NewValue as string;
uri = string.IsNullOrWhiteSpace(uriString) ? null : new Uri(uriString);
}
else if (e.NewValue is Uri)
{
uri = e.NewValue as Uri;
}
browser.Source = uri;
}}
好主意Todd。
我现在已经在Silverlight 4中对RichTextBox.Selection.Text做了类似的操作。谢谢你的帖子。工作良好。
public class RichTextBoxHelper
{
public static readonly DependencyProperty BindableSelectionTextProperty =
DependencyProperty.RegisterAttached("BindableSelectionText", typeof(string),
typeof(RichTextBoxHelper), new PropertyMetadata(null, BindableSelectionTextPropertyChanged));
public static string GetBindableSelectionText(DependencyObject obj)
{
return (string)obj.GetValue(BindableSelectionTextProperty);
}
public static void SetBindableSelectionText(DependencyObject obj, string value)
{
obj.SetValue(BindableSelectionTextProperty, value);
}
public static void BindableSelectionTextPropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
RichTextBox rtb = o as RichTextBox;
if (rtb != null)
{
string text = e.NewValue as string;
if (text != null)
rtb.Selection.Text = text;
}
}
}
这是Xaml代码。
<RichTextBox IsReadOnly='False' TextWrapping='Wrap' utilities:RichTextBoxHelper.BindableSelectionText="{Binding Content}"/>
这是对Todd和Samuel的答案的改进,利用了一些基本的逻辑前提,并使用了null合并运算符。。
public static void BindableSourcePropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
WebBrowser browser = o as WebBrowser;
if ((browser != null) && (e.NewValue != null))
browser.Source = e.NewValue as Uri ?? new Uri((string)e.NewValue);
}
- 如果浏览器为null或位置为null,则我们无法使用或导航到null页面
- 当#1中的项不为null时,则在分配时,如果新值是URI,则使用它。如果不是,并且URI为null,则合并,因为它必须是可以放入URI的字符串;因为#1强制字符串不能为null
您需要在指向类文件的xaml
文件的前几行声明它
xmlns:reportViewer="clr-namespace:CoMS.Modules.Report"