添加项目文件。

Szmedi.Toolkit.Revit/Assists/DoubleValidationRule.cs

@@ -0,0 +1,15 @@
+using System.Globalization;
+using System.Windows.Controls;
+
+namespace Szmedi.Toolkit.Assists
+{
+    public class DoubleValidationRule : ValidationRule
+    {
+        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
+        {
+            return double.TryParse((value ?? string.Empty).ToString(), out _)
+                ? ValidationResult.ValidResult
+                : new ValidationResult(false, "输入数值有误。");
+        }
+    }
+}