bug(SelectTree): 设置初始值后无法选中对应项

[tiansfather]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

与https://github.com/dotnetcore/BootstrapBlazor/issues/988相同，但最新版本9.1.3仍然复现

Expected Behavior

`
@page "/"
@Attribute [TabItemOption(Text = "Index", Closable = false)]
<SelectTree Items="BindItems" Value="@("文件一")">
@code{
private List<TreeViewItem>? BindItems { get; set; } = new List<TreeViewItem>();
protected override async Task OnInitializedAsync()
{
await base.OnInitializedAsync();
//没有下面这行就能显示选中值
await Task.Yield();
LoadData();

}

private void LoadData()
{
    BindItems =
    [
      new TreeViewItem<string>("目录一")
      {
          Text ="目录一",
          Icon = "fa-solid fa-folder",
          ExpandIcon = "fa-solid fa-folder-open",
          Items =
          [
              new TreeViewItem<string>("子目录一")
              {
                  Text ="子目录一",
                  Icon = "fa-solid fa-folder",
                  ExpandIcon = "fa-solid fa-folder-open",
                  Items =
                  [
                      new TreeViewItem<string>("文件一") { Text = "文件一", Icon = "fa-solid fa-file" },
                      new TreeViewItem<string>("文件二") { Text = "文件二", Icon = "fa-solid fa-file" }
                  ]
              }
          ]
      }
  ];
}

}
`

Interactive render mode

Interactive Server (Interactive server-side rendering (interactive SSR) using Blazor Server)

Steps To Reproduce

复现工程.zip

Exceptions (if any)

No response

.NET Version

NET8.0

Anything else?

No response

[bb-auto[bot]]

@tiansfather Thank you for filing this issue. In order for us to investigate this issue, please provide a minimalistic repro project that illustrates the problem.

[ArgoZhang]

@tiansfather 感谢感谢，我稍后复现，如果是bug 修复一下后发包

[ArgoZhang]

@tiansfather 不是 BUG 我转成讨论，我再给答案

[ArgoZhang]

@tiansfather 你的例子我看了。怎么说呢。这都是最最最基本的问题。并不是组件的 bug。可以 B 站关注一下我的视频教程。下面是链接

https://space.bilibili.com/660853738

正确代码有很多种，主要是看你设计。比如 BindItems 初始化给 null

Index.razor

@page "/"
@attribute [TabItemOption(Text = "Index", Closable = false)]

@if (BindItems != null)
{
    <SelectTree Items="BindItems" Value="@("文件一")"></SelectTree>
}

@code {
    private List<TreeViewItem<string>>? BindItems { get; set; }

    protected override async Task OnInitializedAsync()
    {
        await base.OnInitializedAsync();
        //没有下面这行就能显示选中值
        await Task.Yield();

        LoadData();
    }

    private void LoadData()
    {
        // 省略代码
    }
}

知识点是数据异步加载与组件渲染周期

[tiansfather]

那为什么Select没有这个问题呢

[ArgoZhang]

@tiansfather 实在忙的不可开交。开源项目，能否看一下源码，如果有不明白的我再给你解释，或者看完源码明白了，可以帮忙改进一下 SelectTree

[tiansfather]

好的，辛苦了

[tiansfather]

请问下组件里这样修改是不是就可以了，我测试是可以了

[ArgoZhang]

@tiansfather 帮忙跑一下单元测试，如果没问题，就来个 PR 我觉得可以

[tiansfather]

好的，提交了