doc(Table): add explain of binding complex object

src/BootstrapBlazor.Server/Components/Samples/Table/TablesColumn.razor

@@ -170,6 +170,31 @@
     </Table>
 </DemoBlock>
 
+<DemoBlock Title="@Localizer["BindComplexObjectTitle"]" Introduction="@Localizer["BindComplexObjectIntro"]" Name="BindComplexObject">
+    <section ignore>
+        <p>@((MarkupString)Localizer["BindComplexObjectP1"].Value)</p>
+        <p>@((MarkupString)Localizer["BindComplexObjectP2"].Value)</p>
+        <Button OnClick="@OnClickCompanyButton" Text="@Localizer["BindComplexObjectButtonText"]"></Button>
+    </section>
+    <Table TItem="ComplexFoo"
+           IsPagination="true" PageItemsSource="@PageItemsSource" CreateItemCallback="@CreateComplexFoo"
+           IsStriped="true" IsBordered="true"
+           ShowToolbar="false" IsMultipleSelect="true" ShowExtendButtons="false"
+           OnQueryAsync="@OnQueryComplexFooAsync">
+        <TableColumns>
+            <TableColumn @bind-Field="@context.DateTime" Text="@Localizer["ComplexFooDateTime"]" Width="120" FormatString="yyyy-MM-dd" />
+            <TableColumn @bind-Field="@context.Name" Text="@Localizer["ComplexFooName"]" Width="100" />
+            <TableColumn @bind-Field="@context.Address" Text="@Localizer["ComplexFooAddress"]" />
+            <TableColumn @bind-Field="@context.Age" Text="@Localizer["ComplexFooAge"]" />
+            <TableColumn @bind-Field="@context.Company" Text="@Localizer["ComplexFooCompany"]">
+                <Template Context="v">
+                    <div>@v.Row.Company?.Name</div>
+                </Template>
+            </TableColumn>
+        </TableColumns>
+    </Table>
+</DemoBlock>
+
 <DemoBlock Title="@Localizer["OnColumnCreatingTitle"]" Introduction="@Localizer["OnColumnCreatingIntro"]" Name="OnColumnCreating">
     <section ignore>
         <Tips class="mb-3">

src/BootstrapBlazor.Server/Components/Samples/Table/TablesColumn.razor.cs

@@ -18,6 +18,9 @@ public partial class TablesColumn
     [NotNull]
     private List<Foo>? Items { get; set; }
 
+    [NotNull]
+    private List<ComplexFoo>? ComplexItems { get; set; }
+
     private static IEnumerable<int> PageItemsSource => new int[] { 5, 10, 20 };
 
     private bool IgnoreColumn { get; set; }
@@ -30,6 +33,7 @@ protected override void OnInitialized()
         base.OnInitialized();
 
         Items = Foo.GenerateFoo(FooLocalizer);
+        ComplexItems = ComplexFoo.GenerateComplexFoo(FooLocalizer);
     }
 
     private void OnClickIgnoreColumn() => IgnoreColumn = !IgnoreColumn;
@@ -52,6 +56,10 @@ protected override void OnInitialized()
         return Task.FromResult(ret);
     }
 
+    /// <summary>
+    /// Foo 类型的异步查询
+    /// The async query of Items
+    /// </summary>
     private Task<QueryData<Foo>> OnQueryAsync(QueryPageOptions options)
     {
         IEnumerable<Foo> items = Items;
@@ -88,6 +96,46 @@ private Task<QueryData<Foo>> OnQueryAsync(QueryPageOptions options)
         });
     }
 
+    /// <summary>
+    /// ComplexItems 的异步查询
+    /// The async query of ComplexItems
+    /// </summary>
+    private Task<QueryData<ComplexFoo>> OnQueryComplexFooAsync(QueryPageOptions options)
+    {
+        IEnumerable<ComplexFoo> items = ComplexItems;
+
+        // 先处理过滤再处理排序 提高性能
+        var isFiltered = false;
+        if (options.Filters.Count != 0)
+        {
+            items = items.Where(options.Filters.GetFilterFunc<ComplexFoo>());
+            isFiltered = true;
+        }
+
+        // 排序
+        var isSorted = false;
+        if (!string.IsNullOrEmpty(options.SortName))
+        {
+            items = items.Sort(options.SortName, options.SortOrder);
+            isSorted = true;
+        }
+
+        // 设置记录总数
+        var total = items.Count();
+
+        // 内存分页
+        items = items.Skip((options.PageIndex - 1) * options.PageItems).Take(options.PageItems).ToList();
+
+        return Task.FromResult(new QueryData<ComplexFoo>()
+        {
+            Items = items,
+            TotalCount = total,
+            IsSorted = isSorted,
+            IsFiltered = isFiltered,
+            IsSearch = true
+        });
+    }
+
     private static Task<bool> OnSaveAsync(Foo foo, ItemChangedType changedType) => Task.FromResult(true);
 
     private static Task OnColumnCreating(List<ITableColumn> columns)
@@ -115,4 +163,93 @@ private void SetAlign(ITableColumn column, Alignment alignment)
             _dateTimeAlign = alignment;
         }
     }
+
+    /// <summary>
+    /// 复杂类型 ComplexFoo 的构造回调
+    /// Construction callback of complex type ComplexFoo
+    /// </summary>
+    private ComplexFoo CreateComplexFoo() => ComplexFoo.Generate(FooLocalizer);
+
+    /// <summary>
+    /// 设置 ComplexItems 的 Company 属性
+    /// Set property Company of ComplexItems
+    /// </summary>
+    private Task OnClickCompanyButton()
+    {
+        foreach (var complexFoo in ComplexItems)
+        {
+            complexFoo.Company = new Company(((char)('A' + Random.Shared.Next(26))).ToString());
+        }
+        return Task.CompletedTask;
+    }
+
+    /// <summary>
+    /// 示例类 Company
+    /// Class sample Company
+    /// </summary>
+    private class Company(string name)
+    {
+        public string Name { get; set; } = name;
+    }
+
+    /// <summary>
+    /// 示例复杂类型 ComplexFoo
+    /// Complex class sample ComplexFoo
+    /// </summary>
+    private class ComplexFoo : Foo
+    {
+        public int Age { get; set; }
+
+        /// <summary>
+        /// 业务逻辑无法确保 Company 属性不为 null
+        /// The business logic cannot ensure that the Company property is not null.
+        /// </summary>
+        public Company? Company { get; set; }
+
+        /// <summary>
+        /// ComplexFoo 类不提供无参构造函数
+        /// Class ComplexFoo does not provide a parameterless constructor
+        /// </summary>
+        public ComplexFoo(int age)
+        {
+            Age = age;
+        }
+
+        /// <summary>
+        /// 生成含有随机数据的 ComplexFoo 实例
+        /// Generate an instance of ComplexFoo with random data
+        /// </summary>
+        public static new ComplexFoo Generate(IStringLocalizer<Foo> localizer) => new(Random.Shared.Next(20, 65))
+        {
+            Id = 1,
+            Name = localizer["Foo.Name", "1000"],
+            DateTime = System.DateTime.Now,
+            Address = localizer["Foo.Address", $"{Random.Shared.Next(1000, 2000)}"],
+            Count = Random.Shared.Next(1, 100),
+            Complete = Random.Shared.Next(1, 100) > 50,
+            Education = Random.Shared.Next(1, 100) > 50 ? EnumEducation.Primary : EnumEducation.Middle,
+            ReadonlyColumn = Random.Shared.Next(10, 50)
+        };
+
+        /// <summary>
+        /// 生成含有随机数据的 ComplexFoo 实例集合
+        /// Generate a list of ComplexFoo instances with random data
+        /// </summary>
+        /// <returns>
+        /// 返回一个含有随机数据的 ComplexFoo 实例集合
+        /// Return a List of ComplexFoo instances with random data
+        /// </returns>
+        public static List<ComplexFoo> GenerateComplexFoo(IStringLocalizer<Foo> localizer, int count = 80)
+            => Enumerable.Range(1, count).Select(i => new ComplexFoo(Random.Shared.Next(20, 65))
+        {
+            Id = i,
+            Name = localizer["Foo.Name", $"{i:d4}"],
+            DateTime = System.DateTime.Now.AddDays(i - 1),
+            Address = localizer["Foo.Address", $"{Random.Shared.Next(1000, 2000)}"],
+            Count = Random.Shared.Next(1, 100),
+            Complete = Random.Shared.Next(1, 100) > 50,
+            Education = Random.Shared.Next(1, 100) > 50 ? EnumEducation.Primary : EnumEducation.Middle,
+            ReadonlyColumn = Random.Shared.Next(10, 50)
+        }).ToList();
+    }
 }

src/BootstrapBlazor.Server/Locales/en-US.json

@@ -5050,6 +5050,16 @@
     "ShowCopyColumnDesc": "You can fine-tune the <code>Tooltip</code> related parameters of the copy column data icon by setting <code>ShowCopyColumnTooltip</code> <code>CopyColumnTooltipText</code> <code>CopyColumnCopiedTooltipText</code> and other settings",
     "ShowColumnToolboxTitle": "Column Toolbox",
     "ShowColumnToolboxIntro": "Enable the column toolbar button by setting the <code>ToolboxTemplate</code> parameter",
+    "BindComplexObjectTitle": "Bind Complex Types and Expressions",
+    "BindComplexObjectIntro": "When binding a complex type, whether the bound object collection is empty or not, the <code>TItem</code> must provide a parameterless constructor. Otherwise, it is required to provide a construction callback through <code>CreateItemCallback</code>. When binding a complex expression, the bound expression must not throw a <code>NullReferenceException</code> exception. If the business logic cannot avoid this issue, it is recommended to handle it using a <code>Template</code>",
+    "BindComplexObjectP1": "In this example, the complex type <code>ComplexFoo</code> does not have a parameterless constructor, so a construction callback for <code>ComplexFoo</code> should be provided through <code>CreateItemCallback</code>",
+    "BindComplexObjectP2": "In this example, we want to bind a complex expression <code>context.Company.Name</code> to the column <code>CompanyName</code>, but the business logic cannot ensure that the value of the <code>Company</code> property is not <code>null</code> at the time of binding. Therefore, we can first bind a simple expression and then handle it using the column template <code>Template</code>",
+    "BindComplexObjectButtonText": "Set company",
+    "ComplexFooDateTime": "DateTime",
+    "ComplexFooName": "Name",
+    "ComplexFooAddress": "Address",
+    "ComplexFooAge": "Age",
+    "ComplexFooCompany": "Company",
     "OnColumnCreatingTitle": "Set current column properties",
     "OnColumnCreatingIntro": "By specifying <code>OnColumnCreating</code> callback, make secondary data changes to the column collection",
     "OnColumnCreatingP1": "Existing columns can be extended through the parameters in the <code>OnColumnCreating</code> callback method:",

src/BootstrapBlazor.Server/Locales/zh-CN.json

@@ -5050,6 +5050,16 @@
     "ShowCopyColumnDesc": "可以通过设置 <code>ShowCopyColumnTooltip</code> <code>CopyColumnTooltipText</code> <code>CopyColumnCopiedTooltipText</code> 等设置微调拷贝列数据图标的 <code>Tooltip</code> 相关参数",
     "ShowColumnToolboxTitle": "列工具栏",
     "ShowColumnToolboxIntro": "通过设置列 <code>ToolboxTemplate</code> 参数，开启列工具栏按钮",
+    "BindComplexObjectTitle": "绑定复杂类型和表达式",
+    "BindComplexObjectIntro": "当绑定复杂类型时，无论绑定的对象集合是否为空，都要求 <code>TItem</code> 提供无参构造函数，否则要求通过 <code>CreateItemCallback</code> 提供构造回调；当绑定复杂表达式时，要求绑定时该表达式不得引发 <code>NullReferenceException</code> 异常，如果业务逻辑无法避免此问题，建议使用 <code>Template</code> 进行处理",
+    "BindComplexObjectP1": "本例中，复杂类型 <code>ComplexFoo</code> 不具备无参构造函数，需通过 <code>CreateItemCallback</code> 提供 <code>ComplexFoo</code> 的构造回调",
+    "BindComplexObjectP2": "本例中，我们希望将复杂表达式 <code>context.Company.Name</code> 绑定到列 <code>CompanyName</code> 上，但是业务逻辑无法确保绑定时属性 <code>Company</code> 的值不为 <code>null</code> 。因此可以先绑定简单表达式，再通过列模板 <code>Template</code> 进行处理",
+    "BindComplexObjectButtonText": "设置公司",
+    "ComplexFooDateTime": "日期",
+    "ComplexFooName": "姓名",
+    "ComplexFooAddress": "地址",
+    "ComplexFooAge": "年龄",
+    "ComplexFooCompany": "公司",
     "OnColumnCreatingTitle": "设置当前列属性",
     "OnColumnCreatingIntro": "通过指定 <code>OnColumnCreating</code>回调，对列集合进行数据二次更改",
     "OnColumnCreatingP1": "通过 <code>OnColumnCreating</code> 回调方法中的参数既可以对现有列进行扩展：",