Question

所以我正在用剃刀编写此应用程序，现在我正在做一个自定义导航栏。现在，问题出在我编写的OnInitialized事件中：

 protected async override void OnInitialized()
    {
        base.OnInitialized();
        var user = (await AuthStat).User;
        if (user.Identity.IsAuthenticated)
        {
            await Authenticated();
        }
        else
        {
            await NotAuthenticated();
        }
    }

其中的功能是：

 protected Task Authenticated()
    {
        treedata = null;
        treedata = new List<TreeData>();
        treedata.Add(new TreeData { nodeId = "01", nodeText = "Acasa", iconCss = "icon-microchip icon" });
        treedata.Add(new TreeData { nodeId = "03", nodeText = "Logout", iconCss = "icon-thumbs-up-alt icon" });
        treedata.Add(new TreeData { nodeId = "04", nodeText = "Vremea", iconCss = "icon-th icon" });
        treedata.Add(new TreeData { nodeId = "05", nodeText = "Profil", iconCss = "icon-code icon" });
        treedata.Add(new TreeData { nodeId = "06", nodeText = "Calcul Salariu", iconCss = "icon-chrome icon" });
        treedata.Add(new TreeData { nodeId = "07", nodeText = "Mijloace Fixe", iconCss = "icon-up-hand icon" });
        return Task.CompletedTask;

    }

    protected Task NotAuthenticated()
    {
        treedata = null;
        treedata = new List<TreeData>();
        treedata.Add(new TreeData { nodeId = "01", nodeText = "Acasa", iconCss = "icon-microchip icon" });
        treedata.Add(new TreeData { nodeId = "02", nodeText = "Login", iconCss = "icon-docs icon" });
        treedata.Add(new TreeData { nodeId = "04", nodeText = "Vremea", iconCss = "icon-th icon" });
        treedata.Add(new TreeData { nodeId = "06", nodeText = "Calcul Salariu", iconCss = "icon-chrome icon" });
        return Task.CompletedTask;
    }

变量treedata为：

SfTreeView<TreeData> TreeView;
   public class TreeData
   {
       public string nodeId { get; set; }
       public string nodeText { get; set; }
       public string iconCss { get; set; }
       public bool hasChild { get; set; }
       public string pid { get; set; }
   }

我的问题如下：每当页面加载时，treedata仅在发生操作（即搜索或切换导航菜单）时填充，并且我想在页面加载时显示，但我不知道如何

Answer 1

//protected async override void OnInitialized()
  protected override async Task OnInitializedAsync()
  {
    // base.OnInitialized();
    // ...  like before

尚未（无法）等待async void方法。您的Authenticated / NotAuthenticated方法与渲染不同步。

Answer 2

我们检查了您的附加代码，发现您已经使用await方法来获取用户名和TreeView数据源。此函数需要一些时间来获取TreeView组件的用户名和数据源。 TreeView组件不会等到从该函数获取数据后才使用空数据源进行呈现。这是您报告的问题的原因。

我们已经将此问题视为要在TreeView组件中实现的功能支持。该功能的支持将包含在我们的第3卷版本中，该版本预计在2020年9月结束时推出。

感谢您的耐心等候。

关于，小宫P

剃刀/同步融合：在异步页面加载中，除非执行操作，否则不会填充treedata

2 个答案: