添加项目文件。

Common/ConvertHexHelper.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+
+namespace Epost.Common
+{
+   public class ConvertHexHelper
+    {
+
+        public static string ConvertString(string value, int fromBase, int toBase)
+        {
+            try
+            {
+                int intValue = Convert.ToInt32(value, fromBase);
+                return Convert.ToString(intValue, toBase).ToUpper();
+            }
+            catch (Exception e)
+            {
+                LogHelper.WriteLogInfo("转换进制报错："+e.Message+"初始值："+value);
+                //throw;
+                return value;
+
+            }
+
+        }
+        /// <summary>
+        /// 验证字符串是否是数字
+        /// </summary>
+        /// <param name="str"></param>
+        /// <returns></returns>
+        public static bool IsNum(string str)
+        {
+            Regex r = new Regex(@"^[+-]?\d*(,\d{3})*(\.\d+)?$");
+            if (r.IsMatch(str))
+            {
+                return true;
+            }
+            return false;
+        }
+    }
+}