添加项目文件。

Epost.DAL/RoleInfoDAL.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Epost.DAL
+{
+    public class RoleInfoDAL
+    {
+        DataBaseOpration.OprationSqlDAL db = DB_DLL.GetInstance();
+        public DataTable GetRoleInfoList()
+        {
+            string sql = string.Format("select * from roleinfo");
+            return  db.GetsqlForDT(sql);
+        }
+    }
+}