feat(Calendar): add HeaderTemplate parameter

src/BootstrapBlazor/Components/Calendar/Calendar.razor

@@ -86,6 +86,13 @@
             <table cellspacing="0" cellpadding="0" class="calendar-table table-week">
                 <thead>
                     <tr>
+                        @if (AdditionalHeaders != null)
+                        {
+                            foreach (var item in AdditionalHeaders)
+                            {
+                                @RenderAddHeader(item)
+                            }
+                        }
                         @for (var index = 0; index < 7; index++)
                         {
                             @RenderWeekHeader(index)
@@ -115,4 +122,11 @@
             <div>@GetWeekDayString(index)</div>
         </div>
     </th>;
+
+    RenderFragment<string> RenderAddHeader => name =>
+    @<th>
+        <div class="week-header">
+            <div><span class="d-none d-sm-inline-block">@name</span></div> 
+        </div>
+    </th>;
 }

src/BootstrapBlazor/Components/Calendar/Calendar.razor.cs

@@ -173,6 +173,12 @@ protected int GetWeekCount()
     [Parameter]
     public RenderFragment? ChildContent { get; set; }
 
+    /// <summary>
+    /// 获得/设置 附加列
+    /// </summary>
+    [Parameter]
+    public string[]? AdditionalHeaders { get; set; }
+
     /// <summary>
     /// 获得/设置 单元格模板
     /// </summary>