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  • asp.net使用treeview控件,使用reeNodePopulate事件加载节点

    这里使用TreeNodePopulate事件加载各个节点,下面列出步骤:
    1.假设有一个下面类似的类,一个简单的无限极分类的结构:
    class Category
    {
    public string id { get; set; }
    public string name { get; set; }
    public string parentid { get; set; }
    }
    为了演示方便,列出一些模拟数据;
    List<Category> list = null;
    Category c1 = new Category { id = "1", name = "设计部门", parentid = "0" };
    Category c2 = new Category { id = "2", name = "薪酬部门", parentid = "1" };
    Category c3 = new Category { id = "3", name = "后勤部门", parentid = "1" };
    Category c4 = new Category { id = "4", name = "会计部门", parentid = "0" };
    Category c5 = new Category { id = "5", name = "慧眼部门", parentid = "4" };
    Category c6 = new Category { id = "6", name = "模特部门", parentid = "4" };
    Category c7 = new Category { id = "7", name = "交流中心", parentid = "0" };
    Category c8 = new Category { id = "8", name = "会议交流", parentid = "0" };
    list = new List<Category>
    {
    c1,c2,c3,c4,c5,c6,c7,c8
    };
    假设我们页面上要使用的控件ID为TreeView1;
    在页面加载时候为其注册事件:
    TreeView1.TreeNodePopulate += new TreeNodeEventHandler(TreeView1_TreeNodePopulate);
    接下来我们手动写上树的根节点:
    TreeNode tn = new TreeNode();
    tn.Text = "公司栏目";
    tn.Value = "0";
    TreeNodeEventArgs args = new TreeNodeEventArgs(tn);
    TreeView1_TreeNodePopulate(TreeView1, args);//这里去调用事件绑定节点
    TreeView1.Nodes.Add(tn);
    /////////
    void TreeView1_TreeNodePopulate(object sender, TreeNodeEventArgs e)
    {
    List<Category> li = list.Where(x => x.parentid == e.Node.Value).ToList();
    foreach (Category c in li)
    {
    TreeNode n = new TreeNode();
    n.Text = c.name;
    n.Value = c.id;
    n.PopulateOnDemand = true;//注意这个属性设置
    n.NavigateUrl = "files.aspx?folderid=" + Guid.NewGuid();
    n.Target = "main";
    n.SelectAction = TreeNodeSelectAction.Expand;
    e.Node.ChildNodes.Add(n);
    }
    }
    OK了。当然也完全可以递归去append各个节点。

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  • 原文地址:https://www.cnblogs.com/rash/p/2548340.html
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