feat(DataTableDynamicContext): add UseCache parameter (#5389)

* feat: 增加 UseCache 参数

* refactor: 显示控制逻辑

* refactor: 重构代码

* test: 增加单元测试

Author: ArgoZhang

src/BootstrapBlazor/Dynamic/DataTableDynamicContext.cs

@@ -28,6 +28,11 @@ public class DataTableDynamicContext : DynamicObjectContext
 
     private Action<DataTableDynamicContext, ITableColumn>? AddAttributesCallback { get; set; }
 
+    /// <summary>
+    /// 获得/设置 是否启用内部缓存 默认 true 启用
+    /// </summary>
+    public bool UseCache { get; set; } = true;
+
     /// <summary>
     /// 负责将 DataRow 与 Items 关联起来方便查找提高效率
     /// </summary>
@@ -104,7 +109,14 @@ private static bool GetShownColumns(ITableColumn col, IEnumerable<string>? invis
     /// <returns></returns>
     public override IEnumerable<IDynamicObject> GetItems()
     {
-        Items ??= BuildItems();
+        if (UseCache)
+        {
+            Items ??= BuildItems();
+        }
+        else
+        {
+            Items = BuildItems();
+        }
         return Items;
     }
 

test/UnitTest/Components/DataTableDynamicContextTest.cs

@@ -0,0 +1,38 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License
+// See the LICENSE file in the project root for more information.
+// Maintainer: Argo Zhang([email protected]) Website: https://www.blazor.zone
+
+using System.Data;
+
+namespace UnitTest.Components;
+
+public class DataTableDynamicContextTest : BootstrapBlazorTestBase
+{
+    [Fact]
+    public void UseCache_Ok()
+    {
+        var table = new DataTable();
+        table.Columns.Add("Id", typeof(int));
+        table.Rows.Add(1);
+        table.AcceptChanges();
+
+        var context = new DataTableDynamicContext(table);
+        Assert.True(context.UseCache);
+
+        var data = context.GetItems();
+        Assert.Single(data);
+        Assert.Equal(1, data.First().GetValue("Id"));
+
+        // 增加数据
+        table.Rows.Add(2);
+        var data2 = context.GetItems();
+        Assert.Equal(data, data2);
+
+        // 关闭缓存
+        context.UseCache = false;
+        table.Rows.Add(3);
+        data2 = context.GetItems();
+        Assert.Equal(3, data2.Count());
+    }
+}