无法从“字符串”转换为“System.Web.UI.WebControls.TreeNode”

本文关键字:字符串 Web UI TreeNode WebControls System 转换 | 更新日期: 2023-09-27 18:33:40

Dunno为什么得到这个愚蠢或更像是意义的错误,通常我们将字符串添加到treeNode,那么为什么不在此代码中,

groupNode.ChildNodes.Add(UserPair.Value);   

(为什么不呢?

    protected override void CreateChildControls()
    {
        base.CreateChildControls();
        try
        {
            int Index = 0;
            TreeView tree = new TreeView();
            TreeNode groupNode; 
            Dictionary<int, string> GroupList = new Dictionary<int, string>();
            Dictionary<int, string> UserList = new Dictionary<int, string>();
            List<string> IndividualUserList = new List<string>();
            foreach (SPUser user in SPContext.Current.Web.Users)
            {
                string groupName = FormatUserLogin(user.Name);
                if (groupName != "" && groupName != "System Account")
                    IndividualUserList.Add(groupName);
                else if (user.IsDomainGroup && !string.IsNullOrEmpty(groupName) && 
                    Directory.DoesGroupExist(groupName))
                {
                    Index++;
                    GroupList.Add(Index, groupName);
                    List<ADUser> adUsers = Directory.GetUsersFromGroup(groupName);
                    foreach (ADUser member in adUsers)
                    {
                        if (member != null && !string.IsNullOrEmpty(member.DisplayName))
                            UserList.Add(Index, member.DisplayName);
                    }
                }
            }
            IndividualUserList.Sort();
            foreach (string Item in IndividualUserList)
            {
                groupNode = new TreeNode(Item);
            }
            foreach (KeyValuePair<int, string> GroupPair in GroupList)
            {
                groupNode = new TreeNode(GroupPair.Value);
                foreach (KeyValuePair<int, string> UserPair in UserList)
                {
                    if (UserPair.Key == GroupPair.Key)
                        groupNode.ChildNodes.Add(UserPair.Value);
                }
            }
            tree.Nodes.Add(groupNode);
            this.Controls.Add(tree);
        }
        catch (Exception)
        {
            //loggingit
        }
    }

我认为treeNodes可以向它们添加字符串值,如果我的代码中有任何逻辑错误或错误,也请告诉我。

干杯

if (UserPair.Key == GroupPair.Key)
                    {
                        TreeNode userNode = new TreeNode(UserPair.Value);
                        groupNode.ChildNodes.Add(userNode);
                    }

无法从“字符串”转换为“System.Web.UI.WebControls.TreeNode”

groupNode.ChildNodes是一个TreeNodeCollection。 只能将类型为 TreeNode 的对象添加到集合中。 更改此行:

groupNode.ChildNodes.Add(UserPair.Value);

自:

groupNode.ChildNodes.Add(new TreeNode(UserPair.Value));