feat(SelectTree): add OnSearchAsync parameter (#7844)

* SelectTree有ShowSearch参数，漏掉OnSearchAsync参数

SelectTree有ShowSearch参数，漏掉OnSearchAsync参数

* refactor: 移除不用的命名空间

* chore: bump version 10.5.1-beta07

---------

Co-authored-by: Argo Zhang <argo@live.ca>

Author: Tony-ST0754

src/BootstrapBlazor/BootstrapBlazor.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Razor">
 
   <PropertyGroup>
-    <Version>10.5.1-beta06</Version>
+    <Version>10.5.1-beta07</Version>
   </PropertyGroup>
 
   <ItemGroup>

src/BootstrapBlazor/Components/Select/SelectTree.razor

@@ -1,4 +1,4 @@
-@namespace BootstrapBlazor.Components
+@namespace BootstrapBlazor.Components
 @typeparam TValue
 @inherits PopoverSelectBase<TValue>
 @attribute [BootstrapModuleAutoLoader("Select/SelectTree.razor.js")]
@@ -22,7 +22,7 @@
     <div class="dropdown-menu">
         <TreeView TItem="TValue" Items="@Items" ShowIcon="ShowIcon" @ref="_tv"
                   OnTreeItemClick="OnItemClick" ModelEqualityComparer="@ModelEqualityComparer"
-                  ShowSearch="ShowSearch" ShowResetSearchButton="ShowResetSearchButton"
+                  ShowSearch="ShowSearch" ShowResetSearchButton="ShowResetSearchButton" OnSearchAsync="OnSearchAsync"
                   CanExpandWhenDisabled="CanExpandWhenDisabled"
                   CustomKeyAttribute="@CustomKeyAttribute" OnExpandNodeAsync="@OnExpandNodeAsync" />
     </div>

src/BootstrapBlazor/Components/Select/SelectTree.razor.cs

@@ -134,6 +134,14 @@ public partial class SelectTree<TValue> : IModelEqualityComparer<TValue>
     [Parameter]
     public bool ShowSearch { get; set; }
 
+    /// <summary>
+    /// <para lang="zh">获得/设置 搜索回调方法，默认为 null</para>
+    /// <para lang="en">Gets or sets the search callback method. Default is null</para>
+    /// </summary>
+    /// <remarks>Enabled by setting <see cref="ShowSearch"/> to true.</remarks>
+    [Parameter]
+    public Func<string?, Task<List<TreeViewItem<TValue>>?>>? OnSearchAsync { get; set; }
+
     /// <summary>
     /// <para lang="zh">获得/设置 是否固定搜索栏 默认 false 不固定</para>
     /// <para lang="en">Gets or sets Whether fixed search box. Default false</para>