refactor: 更新逻辑

Author: ArgoZhang

src/BootstrapBlazor/Components/Upload/AvatarUpload.razor.cs

@@ -148,6 +148,22 @@ protected override void OnParametersSet()
         };
     }
 
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
+    /// <returns></returns>
+    protected override bool CheckCanUpload()
+    {
+        // 允许多上传
+        if (IsMultiple)
+        {
+            return !MaxFileCount.HasValue || GetUploadFiles().Count < MaxFileCount;
+        }
+
+        // 只允许单个上传
+        return UploadFiles.Count == 0;
+    }
+
     /// <summary>
     /// 获得 数据验证客户端 ID
     /// </summary>

src/BootstrapBlazor/Components/Upload/CardUpload.razor.cs

@@ -258,12 +258,6 @@ protected override void OnParametersSet()
     /// <returns></returns>
     protected override bool CheckCanUpload()
     {
-        // 如果组件禁用了 IsDisabled 允许上传但是不出现 + 按钮
-        if (IsDisabled)
-        {
-            return true;
-        }
-
         // 允许多上传
         if (IsMultiple)
         {