[英]asp:TreeView with parent-child relationship in SQL
I wrote some code: 我写了一些代码:
protected void RootNodes()
{
var contents = ListContentRootNodes(0, this.Culture, true);
foreach (var content in contents)
{
TreeNode newNode = new TreeNode
{
Value = content.Title
};
List<TreeNode> childNode = ChildNode(content.ContentId);
if (childNode != null)
{
foreach (var item in childNode)
{
newNode.ChildNodes.Add(item);
}
treeView.Nodes.Add(newNode);
}
treeView.ExpandAll();
}
}
protected List<TreeNode> ChildNode(int contentId)
{
var subContents = ListContentChildNodesAll(contentId, this.Culture);
List<TreeNode> nodes = new List<TreeNode>();
foreach (var sub in subContents)
{
nodes.Add(new TreeNode { Value = sub.Title });
ChildNode(sub.ContentId);
}
return nodes;
}
'ListContentRootNodes' returns first level data rows with 'ParentId' set to '-1' . “ ListContentRootNodes”返回将“ ParentId”设置为“ -1”的第一级数据行。 ListContentChildNodesAll calling stored procedure: ListContentChildNodesAll调用存储过程:
CREATE PROCEDURE [dbo].[ListChildNodesAll]
@ContentId int,
@Culture nvarchar(5)
AS SET NOCOUNT ON
SELECT * FROM Content WHERE ParentId=@ContentId AND Culture=@Culture
As far as I searched on net, I've understood that I need recursion method in order to populate rows from 'DB' , but I could not managed it. 就我在网上搜索而言,我了解到我需要递归方法才能从'DB'填充行,但是我无法对其进行管理。 I need to create sitemap where all subnodes would be represented. 我需要创建将表示所有子节点的站点地图。 My code is returning only first level and not all child rows. 我的代码仅返回第一级,而不是所有子行。 How should I fixed it? 我该如何解决?
I finally find solution.My complete working code is : 我终于找到了解决方案,我完整的工作代码是:
protected void RootNodes()
{
var contents = ListContentRootNodes(0, this.Culture, true);
foreach (var content in contents)
{
TreeNode newNode = new TreeNode { Value = content.Title };
List<TreeNode> childNode = ChildNode(content.ContentId);
if (childNode != null)
{
foreach (var item in childNode)
{
newNode.ChildNodes.Add(item);
}
treeView.Nodes.Add(newNode);
}
treeView.ExpandAll();
}
}
protected List<TreeNode> ChildNode(int contentId)
{
var subContents = ListContentChildNodesAll(contentId, this.Culture);
List<TreeNode> nodes = new List<TreeNode>();
foreach (var sub in subContents)
{
TreeNode nod = new TreeNode { Value = sub.Title };
nodes.Add(nod);
List<TreeNode> leafNodes = ChildNode(sub.ContentId);
foreach (var leaf in leafNodes)
{
nod.ChildNodes.Add(leaf);
}
}
return nodes;
}
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