AddChart添加图表时，如果没有设置Y轴，则自动增加一个

NewLife.CubeNC/Common/ReadOnlyEntityController.cs

@@ -969,6 +969,10 @@ public partial class ReadOnlyEntityController<TEntity> : ControllerBaseX where T
             }
 
             chart.Add(data, yFields, seriesType);
+
+            // 如果没有Y轴，自动补上
+            if (yFields.Length > 0 && (chart.YAxis == null || chart.YAxis.Count == 0))
+                chart.SetY(yFields[0].Name, "value");
         }
 
         if (seriesType == SeriesTypes.Pie)

NewLife.CubeNC/ViewModels/ListField.cs

@@ -2,14 +2,12 @@
 using System.Text.Json.Serialization;
 using System.Text.RegularExpressions;
 using System.Web;
-using System.Xml.Linq;
 using System.Xml.Serialization;
 using NewLife.Collections;
 using NewLife.Data;
 using NewLife.Reflection;
 using NewLife.Web;
 using XCode.Configuration;
-using static System.Net.Mime.MediaTypeNames;
 
 namespace NewLife.Cube.ViewModels;