修复DataGrid列绑定是否显示的问题

Extensions/BindingProxy.cs

@@ -0,0 +1,22 @@
+using System.Windows;
+
+namespace PMSWPF.Extensions
+{
+    public class BindingProxy : Freezable
+    {
+        // Using a DependencyProperty as the backing store for Data.  This enables animation, styling, binding, etc...
+        public static readonly DependencyProperty DataProperty =
+            DependencyProperty.Register("Data", typeof(object), typeof(BindingProxy), new UIPropertyMetadata(null));
+
+        public object Data
+        {
+            get { return (object)GetValue(DataProperty); }
+            set { SetValue(DataProperty, value); }
+        }
+
+        protected override Freezable CreateInstanceCore()
+        {
+            return new BindingProxy();
+        }
+    }
+}