Code optimization

Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs

@@ -238,7 +238,7 @@ namespace SqlSugar
             string orderByValue = (!isRowNumber && this.OrderByValue.IsValuable()) ? GetOrderByString : null;
             if (this.IsCount) { orderByValue = null; }
             sql.AppendFormat(SqlTemplate, GetSelectValue, GetTableNameString, GetWhereValueString, groupByValue, orderByValue);
-            sql.Replace("{$:OrderByString:$}", isRowNumber ? (this.IsCount ? null : rowNumberString) : null);
+            sql.Replace(UtilConstants.OrderReplace, isRowNumber ? (this.IsCount ? null : rowNumberString) : null);
             if (this.IsCount) { return sql.ToString(); }
             var result = ToPageSql(sql.ToString(), this.Take, this.Skip);
             if (ExternalPageIndex > 0)

Src/Asp.Net/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerQueryBuilder.cs

@@ -12,7 +12,7 @@ namespace SqlSugar
         {
             get
             {
-                return "SELECT {0}{{$:OrderByString:$}} FROM {1}{2}{3}{4}";
+                return "SELECT {0}{"+UtilConstants.OrderReplace+"} FROM {1}{2}{3}{4}";
             }
         }
     }