添加项目文件。

MetroGauges/General/NotEmptyValidationRule.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Controls;
+
+namespace MetroGauges.General
+{
+    public class NotEmptyValidationRule : ValidationRule
+    {
+        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
+        {
+            return string.IsNullOrWhiteSpace((value ?? "").ToString())
+                ? new ValidationResult(false, "此项不能为空")
+                : ValidationResult.ValidResult;
+        }
+    }
+}