完成Grid示例

RazorEngineTest/ExHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Media;
+using System.Windows;
+
+namespace RazorEngineTest
+{
+    public static class ExHelper
+    {
+        public static T? FindVisualChild<T>(this DependencyObject parent, string name = "") where T : DependencyObject
+        {
+            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
+            {
+                var child = VisualTreeHelper.GetChild(parent, i);
+                if (child is T result)
+                {
+                    if (string.IsNullOrEmpty(name)) return result;
+                    else if (result is FrameworkElement element && element.Name == name) return result;
+                }
+                var descendant = child.FindVisualChild<T>(name);
+                if (descendant != null) return descendant;
+            }
+            return null;
+        }
+    }
+}