refactor: 移动 DropdownMenuClassString 到基类

Author: ArgoZhang

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

@@ -40,15 +40,9 @@ public partial class MultiSelect<TValue>
         .AddClass("d-none", SelectedItems.Count != 0)
         .Build();
 
-    /// <summary>
-    /// 获得 SearchLoadingIcon 图标字符串
-    /// </summary>
     private string? SearchLoadingIconString => CssBuilder.Default("icon searching-icon")
         .AddClass(SearchLoadingIcon)
         .Build();
-    private string? DropdownMenuClassString => CssBuilder.Default("dropdown-menu")
-        .AddClass("is-fixed-search", ShowSearch && IsFixedSearch)
-        .Build();
 
     /// <summary>
     /// 获得/设置 绑定数据集

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

@@ -47,10 +47,6 @@ public partial class Select<TValue> : ISelect, ILookup
         .AddClass(SearchLoadingIcon)
         .Build();
 
-    private string? DropdownMenuClassString => CssBuilder.Default("dropdown-menu")
-        .AddClass("is-fixed-search", ShowSearch && IsFixedSearch)
-        .Build();
-
     private readonly List<SelectedItem> _children = [];
 
     private string? ScrollIntoViewBehaviorString => ScrollIntoViewBehavior == ScrollIntoViewBehavior.Smooth ? null : ScrollIntoViewBehavior.ToDescriptionString();
@@ -100,7 +96,7 @@ public partial class Select<TValue> : ISelect, ILookup
     public RenderFragment<SelectedItem?>? DisplayTemplate { get; set; }
 
     /// <summary>
-    /// Gets or sets whether virtual scrolling is enabled. Default is false. Note: When virtual scrolling is enabled, <see cref="SelectBase{TValue}.ShowSearch"/>, <see cref="PopoverSelectBase{TValue}.IsPopover"/>, and <seealso cref="IsFixedSearch"/> are not supported. Set <see cref="DefaultVirtualizeItemText"/> when setting initial values.
+    /// Gets or sets whether virtual scrolling is enabled. Default is false.
     /// </summary>
     [Parameter]
     public bool IsVirtualize { get; set; }

src/BootstrapBlazor/Components/Select/SelectBase.cs

@@ -121,6 +121,13 @@ public abstract class SelectBase<TValue> : PopoverSelectBase<TValue>
         .AddClass($"text-danger", IsValid.HasValue && !IsValid.Value)
         .Build();
 
+    /// <summary>
+    /// Gets the dropdown menu class string.
+    /// </summary>
+    protected string? DropdownMenuClassString => CssBuilder.Default("dropdown-menu")
+        .AddClass("is-fixed-search", ShowSearch && IsFixedSearch)
+        .Build();
+
     /// <summary>
     /// <inheritdoc/>
     /// </summary>