Fix TimePicker culture-specific decimal separator in CSS transform

Co-authored-by: ArgoZhang <[email protected]>

Author: Copilot

src/BootstrapBlazor/Components/TimePicker/TimePickerCell.razor.cs

@@ -3,6 +3,8 @@
 // See the LICENSE file in the project root for more information.
 // Maintainer: Argo Zhang([email protected]) Website: https://www.blazor.zone
 
+using System.Globalization;
+
 namespace BootstrapBlazor.Components;
 
 /// <summary>
@@ -51,7 +53,7 @@ public partial class TimePickerCell
     /// 获得 组件单元数据样式
     /// </summary>
     private string? StyleName => CssBuilder.Default()
-        .AddClass($"transform: translateY({CalcTranslateY()}px);")
+        .AddClass($"transform: translateY({CalcTranslateY().ToString(CultureInfo.InvariantCulture)}px);")
         .Build();
 
     private string? UpIconString => CssBuilder.Default("time-spinner-arrow time-up")

test/UnitTest/Components/TimePickerTest.cs

@@ -3,6 +3,8 @@
 // See the LICENSE file in the project root for more information.
 // Maintainer: Argo Zhang([email protected]) Website: https://www.blazor.zone
 
+using System.Globalization;
+
 namespace UnitTest.Components;
 
 public class TimePickerTest : BootstrapBlazorTestBase
@@ -98,4 +100,46 @@ public async Task OnClickConfirm_Ok()
         await cut.InvokeAsync(() => btn.Click());
         Assert.True(confirm);
     }
+
+    [Fact]
+    public void TimePickerCell_StyleName_CultureInvariant()
+    {
+        // Save original culture
+        var originalCulture = CultureInfo.CurrentCulture;
+        var originalUICulture = CultureInfo.CurrentUICulture;
+        
+        try
+        {
+            // Set culture to Turkish which uses comma as decimal separator
+            var turkishCulture = new CultureInfo("tr-TR");
+            CultureInfo.CurrentCulture = turkishCulture;
+            CultureInfo.CurrentUICulture = turkishCulture;
+            
+            var cut = Context.RenderComponent<TimePickerCell>(pb =>
+            {
+                pb.Add(a => a.ViewMode, TimePickerCellViewMode.Hour);
+                pb.Add(a => a.Value, TimeSpan.FromHours(2.5));
+            });
+            
+            // Call OnHeightCallback to set internal height
+            cut.InvokeAsync(() => cut.Instance.OnHeightCallback(36.59375));
+            
+            // The StyleName property should use dots, not commas, even in Turkish culture
+            var styleElement = cut.Find("ul.time-spinner-list");
+            var style = styleElement.GetAttribute("style");
+            
+            // CSS should use dots for decimal values, not commas
+            Assert.Contains(".", style);
+            Assert.DoesNotContain(",", style);
+            
+            // Should contain valid translateY with dot decimal separator
+            Assert.Matches(@"transform:\s*translateY\(-?\d+\.\d*px\);", style);
+        }
+        finally
+        {
+            // Restore original culture
+            CultureInfo.CurrentCulture = originalCulture;
+            CultureInfo.CurrentUICulture = originalUICulture;
+        }
+    }
 }