验证属性字段，增加逗号分开的字符串字段

Model/Database/ApiInfo.cs

@@ -239,6 +239,20 @@ namespace Model
         /// 验证属性
         /// </summary>
         public string[] checkAttribute { get; set; }
+        public string checkAttributeString
+        {
+            get
+            {
+                if (checkAttribute != null)
+                {
+                    return string.Join(",", checkAttribute);
+                }
+                else
+                {
+                    return "";
+                }
+            }   
+        }
 
 
         /// <summary>