Silverlight 3 中区分大小写的 UriMapper 问题

Question

在 Silverlight 3 的导航 API 中，UriMapper 类区分大小写。对于以下 uri 映射，

<nav:Frame Source="/Home">
  <nav:Frame.UriMapper>
    <uriMapper:UriMapper>
      <uriMapper:UriMapping
        Uri=""
        MappedUri="/Views/HomePage.xaml"/>
      <uriMapper:UriMapping
        Uri="/entity/{code}"
        MappedUri="/Views/EntityEditorPage.xaml?code={code}"/>
      <uriMapper:UriMapping
        Uri="/{pageName}"
        MappedUri="/Views/{pageName}Page.xaml"/>
    </uriMapper:UriMapper>
  </nav:Frame.UriMapper>
</nav:Frame>

“/entity/123”正确映射到“/Views/EntityEditorPage.xaml?code=123” 但“/Entity/123”将失败，并出现“/Views/Entity/123Page.xaml not found”异常。

如何将 UriMapper 设为不区分大小写？

谢谢。

Answer 1

Safor，

我完全按照安东尼为我自己的申请所建议的去做。

以下是修改为使用 CustomUriMapper 的 XAML：

<nav:Frame Source="/Home">
    <nav:Frame.UriMapper>
        <app:CustomUriMapper>
            <app:CustomUriMapping Uri="" MappedUri="/Views/HomePage.xaml"/>
            <app:CustomUriMapping Uri="/entity/{code}" MappedUri="/Views/EntityEditorPage.xaml?code={code}"/>
            <app:CustomUriMapping Uri="/{pageName}" MappedUri="/Views/{pageName}Page.xaml"/>
        </app:CustomUriMapper>
    </nav:Frame.UriMapper>
</nav:Frame>

以下是 CustomUriMapping 和 CustomUriMapper 类的代码：

using System;
using System.Collections.ObjectModel;
using System.Windows.Markup;
using System.Windows.Navigation;

namespace YourApplication
{
    // In XAML:
    // <app:CustomUriMapper>
    //     <app:CustomUriMapping Uri="/{search}" MappedUri="/Views/searchpage.xaml?searchfor={search}"/>
    // </app:CustomUriMapper>

    public class CustomUriMapping
    {
        public Uri Uri { get; set; }
        public Uri MappedUri { get; set; }

        public Uri MapUri(Uri uri)
        {
            // Do the uri mapping without regard to upper or lower case
            UriMapping _uriMapping = new UriMapping() { Uri = (Uri == null || string.IsNullOrEmpty(Uri.OriginalString) ? null : new Uri(Uri.OriginalString.ToLower(), UriKind.RelativeOrAbsolute)), MappedUri = MappedUri };
            return _uriMapping.MapUri(uri == null || string.IsNullOrEmpty(uri.OriginalString) ? null : new Uri(uri.OriginalString.ToLower(), UriKind.RelativeOrAbsolute));
        }
    }

    [ContentProperty("UriMappings")]
    public class CustomUriMapper : UriMapperBase
    {
        public ObservableCollection<CustomUriMapping> UriMappings { get { return m_UriMappings; } private set { m_UriMappings = value; } }
        private ObservableCollection<CustomUriMapping> m_UriMappings = new ObservableCollection<CustomUriMapping>();

        public override Uri MapUri(Uri uri)
        {
            if (m_UriMappings == null)
                return uri;

            foreach (CustomUriMapping mapping in m_UriMappings)
            {
                Uri mappedUri = mapping.MapUri(uri);
                if (mappedUri != null)
                    return mappedUri;
            }

            return uri;
        }
    }
}

祝你好运，Jim McCurdy

Answer 2

UriMapper 使用正则表达式，尝试将映射更改为“[V|v]iews/EntityEditorPage.xaml?code={code}” 对于初学者来说，这将使视图中的 V 大小写变得不敏感

Answer 3

你不能轻易做到这一点。最终，您需要派生自己的 UriMapperBase 并自行完成所有映射逻辑。除非您可以使用一些简化的映射，否则这可能不值得做。