如何使用动态数据/LINQTOSQL框架创建面包屑？

发布于 2024-08-19 19:46:25 字数 67 浏览 17 评论 0 原文

我需要一些关于如何创建动态面包屑控件的示例或想法，该控件将为由 LINQTOSQL 提供支持的动态日期框架动态生成面包屑

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静赏你的温柔 2024-08-26 19:46:25

您可能需要三样东西：

数据库中的层次结构*
基于 StaticSiteMapProvider 读取层次结构
A SiteMapPath 控件来显示面包屑。

* 当我想要为客户端站点提供类似的东西时，我进行了一些搜索，并决定将路径结构存储在数据库中将是最简单的 - 我已经给出了之前的答案用于任意深度站点地图 - 请注意，如果您使用的是 SQL2008，可以使用新的 HierarchyId 数据类型来简化此操作。

话虽如此，如果您有类别和产品之类的内容，您可能可以在数据库中使用更简单的系统。

我需要创建来解决这个问题的关键函数如下：

/// <summary>
/// Gets this SiteMaps children.
/// </summary>
/// <value>The children.</value>
public List<SiteMap> Children {
  get {
    if (null == m_Children && !m_AttemptedToLoadChildren) {
      m_AttemptedToLoadChildren = true;

      m_Children = ctx.GetSiteMapChildrenByPath(_Path, 1).ToList();

      // Sorts ascending.
      m_Children.Sort(( sm1, sm2 ) => sm1.SortOrder.CompareTo(sm2.SortOrder));
      // CMS Sorts Descending, so reverse the list.
      m_Children.Reverse();
    }

    return m_Children;
  }
}

/// <summary>
/// Gets a value indicating whether this instance has any children.
/// </summary>
/// <value>
///  <c>true</c> if this instance has children; otherwise, <c>false</c>.
/// </value>
public bool HasChildren {
  get {
    if (null != Children && Children.Any()) {
      m_HasChildren = true;
    }

    return m_HasChildren;
  }
}

/// <summary>
/// Gets this SiteMaps parent.
/// </summary>
/// <value>The parent.</value>
public SiteMap Parent {
  get {
    if (null == m_Parent && null != _ParentId) {
      m_Parent = ctx.GetSiteMap(_ParentId);
    }

    return m_Parent;
  }
}

GetSiteMap 和 GetSiteMapChildrenByPath 调用存储过程来构建层次结构，因为使用 LINQ 将其拉出将非常容易复杂的。

You'll probably need three things:

A hierarchy structure in your database*
A custom SiteMap provider based on the StaticSiteMapProvider to read the hierarchy
A SiteMapPath control to display the Breadcrumb.

* I'd done some hunting around when I wanted something similar for a client site, and decided that storing the path structure in the database would be simplest - I've given the answer previously here for an arbitrary depth site map - note that if you're using SQL2008 you can use the new HierarchyId data type to make this a bit easier.

That being said, if you've got things like categories and products, you can probably get away with a simpler system in your database.

The key functions I needed to create to resolve this were things like:

/// <summary>
/// Gets this SiteMaps children.
/// </summary>
/// <value>The children.</value>
public List<SiteMap> Children {
  get {
    if (null == m_Children && !m_AttemptedToLoadChildren) {
      m_AttemptedToLoadChildren = true;

      m_Children = ctx.GetSiteMapChildrenByPath(_Path, 1).ToList();

      // Sorts ascending.
      m_Children.Sort(( sm1, sm2 ) => sm1.SortOrder.CompareTo(sm2.SortOrder));
      // CMS Sorts Descending, so reverse the list.
      m_Children.Reverse();
    }

    return m_Children;
  }
}

/// <summary>
/// Gets a value indicating whether this instance has any children.
/// </summary>
/// <value>
///  <c>true</c> if this instance has children; otherwise, <c>false</c>.
/// </value>
public bool HasChildren {
  get {
    if (null != Children && Children.Any()) {
      m_HasChildren = true;
    }

    return m_HasChildren;
  }
}

/// <summary>
/// Gets this SiteMaps parent.
/// </summary>
/// <value>The parent.</value>
public SiteMap Parent {
  get {
    if (null == m_Parent && null != _ParentId) {
      m_Parent = ctx.GetSiteMap(_ParentId);
    }

    return m_Parent;
  }
}

GetSiteMap and GetSiteMapChildrenByPath call into stored procs to build the hierarchy as pulling it out with LINQ was going to be quite complex.

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