新增验证

Mall.Common/Plugin/JsonHelper.cs

@@ -232,5 +232,28 @@ namespace Mall.Common.Plugin
                 );
             return JsonConvert.DeserializeObject(json);
         }
+
+        /// <summary>
+        /// 判断字符串是不是JSON格式
+        /// </summary>
+        /// <param name="json"></param>
+        /// <returns></returns>
+        public static bool IsJson(string json)
+        {
+            bool flag = false;
+            if (!string.IsNullOrEmpty(json))
+            {
+                try
+                {
+                    _ = (JObject)JsonConvert.DeserializeObject(json);
+                    flag = true;
+                }
+                catch
+                {
+                    flag = false;
+                }
+            }
+            return flag;
+        }
     }
 }