refactor: 增加可为空标志

Author: ArgoZhang

src/BootstrapBlazor/Attributes/AutoGenerateColumnAttribute.cs

@@ -158,7 +158,7 @@ public class AutoGenerateColumnAttribute : AutoGenerateBaseAttribute, ITableColu
     /// <summary>
     /// <inheritdoc/>
     /// </summary>
-    public Func<object, Task<string?>>? Formatter { get; set; }
+    public Func<object?, Task<string?>>? Formatter { get; set; }
 
     /// <summary>
     /// 获得/设置 编辑模板

src/BootstrapBlazor/Components/Table/ITableColumn.cs

@@ -128,7 +128,7 @@ public interface ITableColumn : IEditorItem
     /// <summary>
     /// 获得/设置 列格式化回调委托 <see cref="TableColumnContext{TItem, TValue}"/>
     /// </summary>
-    Func<object, Task<string?>>? Formatter { get; set; }
+    Func<object?, Task<string?>>? Formatter { get; set; }
 
     /// <summary>
     /// 获得/设置 文字对齐方式 默认为 null 使用 Alignment.None

src/BootstrapBlazor/Components/Table/InternalTableColumn.cs

@@ -127,7 +127,7 @@ class InternalTableColumn(string fieldName, Type fieldType, string? fieldText =
     /// </summary>
     public string? PlaceHolder { get; set; }
 
-    public Func<object, Task<string?>>? Formatter { get; set; }
+    public Func<object?, Task<string?>>? Formatter { get; set; }
 
     public Alignment? Align { get; set; }
 

src/BootstrapBlazor/Components/Table/TableColumn.cs

@@ -285,7 +285,7 @@ public class TableColumn<TItem, TType> : BootstrapComponentBase, ITableColumn
     /// <inheritdoc/>
     /// </summary>
     [Parameter]
-    public Func<object, Task<string?>>? Formatter { get; set; }
+    public Func<object?, Task<string?>>? Formatter { get; set; }
 
     /// <summary>
     /// 获得/设置 显示模板