asp.net树形结构如何实现节点权限

在ASP.NET中实现树形结构的节点权限，可以通过以下步骤来完成：

1. 创建一个树形结构类（Tree）：

public class Tree
{

    public int Id {
     get;
     set;
 }

    public string Name {
     get;
     set;
 }

    public int? ParentId {
     get;
     set;
 }

    public bool IsVisible {
     get;
     set;
 }
    
    public List<
    Tree>
 Children {
     get;
     set;
 }


    public Tree()
    {
    
        Children = new List<
    Tree>
    ();

    }

}

1. 创建一个权限管理类（PermissionManager）：

public class PermissionManager
{
    
    private readonly List<
    Tree>
     _trees;
    
    private readonly Dictionary<
    int, List<
    string>
    >
     _permissions;
    

    public PermissionManager(List<
    Tree>
     trees, Dictionary<
    int, List<
    string>
    >
 permissions)
    {
    
        _trees = trees;
    
        _permissions = permissions;

    }


    public bool IsNodeVisible(int nodeId)
    {

        if (_permissions.TryGetValue(nodeId, out var permissions))
        {
    
            return permissions.Any(permission =>
     permission == "View");

        }
    

        return true;

    }

}

1. 在你的控制器中，初始化树形结构和权限管理类：

public class TreeController : Controller
{
    
    private readonly PermissionManager _permissionManager;
    

    public TreeController(List<
    Tree>
     trees, Dictionary<
    int, List<
    string>
    >
 permissions)
    {
    
        _permissionManager = new PermissionManager(trees, permissions);

    }


    public ActionResult Index()
    {
    
        var rootNodes = _permissionManager.GetVisibleNodes();
    
        return View(rootNodes);

    }
    

    private List<
    Tree>
 GetVisibleNodes()
    {
    
        var nodes = new List<
    Tree>
    ();


        foreach (var tree in _trees)
        {

            if (_permissionManager.IsNodeVisible(tree.Id))
            {
    
                var children = GetVisibleNodesRecursive(tree);
    
                tree.Children = children;
    
                nodes.Add(tree);

            }

        }
    

        return nodes;

    }
    

    private List<
    Tree>
 GetVisibleNodesRecursive(Tree tree)
    {
    
        var nodes = new List<
    Tree>
    ();


        foreach (var child in tree.Children)
        {

            if (_permissionManager.IsNodeVisible(child.Id))
            {
    
                var children = GetVisibleNodesRecursive(child);
    
                child.Children = children;
    
                nodes.Add(child);

            }

        }
    

        return nodes;

    }

}
    

1. 在你的视图中，使用递归方法来渲染树形结构：

@model List<
    Tree>
    

<
    ul>

    @foreach (var node in Model)
    {

        @Html.Partial("_TreeNode", node)
    }
    
<
    /ul>
    

@model Tree

<
    li>

    @Model.Name
    @if (Model.Children.Any())
    {
    
        <
    ul>

            @foreach (var child in Model.Children)
            {

                @Html.Partial("_TreeNode", child)
            }
    
        <
    /ul>

    }
    
<
    /li>
    

这样，你就可以根据用户的权限来显示或隐藏树形结构中的节点。

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