refactor: 增加 LookupService 支持

Author: ArgoZhang

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

@@ -284,7 +284,10 @@ private SelectedItem? SelectedRow
     private List<SelectedItem> GetRowsByItems()
     {
         var items = new List<SelectedItem>();
-        items.AddRange(Items);
+        if (Items != null)
+        {
+            items.AddRange(Items);
+        }
         items.AddRange(_children);
         return items;
     }
@@ -306,11 +309,20 @@ protected override void OnParametersSet()
     {
         base.OnParametersSet();
 
-        Items ??= [];
         PlaceHolder ??= Localizer[nameof(PlaceHolder)];
         NoSearchDataText ??= Localizer[nameof(NoSearchDataText)];
         DropdownIcon ??= IconTheme.GetIconByKey(ComponentIcons.SelectDropdownIcon);
         ClearIcon ??= IconTheme.GetIconByKey(ComponentIcons.SelectClearIcon);
+    }
+
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
+    protected override async Task OnParametersSetAsync()
+    {
+        await base.OnParametersSetAsync();
+
+        Items ??= await GetItemsAsync();
 
         // 内置对枚举类型的支持
         if (!Items.Any() && ValueType.IsEnum())
@@ -338,6 +350,16 @@ protected override async Task OnAfterRenderAsync(bool firstRender)
         }
     }
 
+    private async Task<IEnumerable<SelectedItem>> GetItemsAsync()
+    {
+        IEnumerable<SelectedItem>? items = null;
+        if (LookupService != null)
+        {
+            items = await LookupService.GetItemsByKeyAsync(LookupServiceKey, LookupServiceData);
+        }
+        return items ?? [];
+    }
+
     /// <summary>
     /// 获得/设置 数据总条目
     /// </summary>