asp.net 狼奔 Dal层数据过滤

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Common;
using System.Reflection;

namespace Langben.DAL.Framework
{
    public class SelectData
    {
        public static string SelectDataByRole<T>(ref int flagWhere) where T : new()
        {
            //需要过滤的字段名:key为表名,value为字段名
            Dictionary<string, string> fieldNams = new Dictionary<string, string>();
            fieldNams.Add("SysPerson", "Name");

            List<string> keys = new List<string>(fieldNams.Keys);
            string where = string.Empty + "(";
            Account ac = null;
            if (System.Web.HttpContext.Current != null && System.Web.HttpContext.Current.Session != null && System.Web.HttpContext.Current.Session["account"] != null)
            {
                ac = System.Web.HttpContext.Current.Session["account"] as Account;
            }
            List<string> roles = ac.RoleNames;
            if (roles.Contains("超级管理员"))
            {
                if (where == "(")
                {
                    return where.Replace("(", "");
                }
                return where;
            }
            //反射模型
            T t = new T();
            Type type = typeof(T);
            string tempName = "";
            // 获得此模型的公共属性
            PropertyInfo[] propertys = t.GetType().GetProperties();
            //获得类名
            string className = type.Name;
            //遍历属性
            foreach (PropertyInfo pi in propertys)
            {
                //字段名
                tempName = pi.Name;
                //是否包含此类
                if (fieldNams.Keys.Contains(className))
                {
                    for (int i = 0; i < fieldNams.Count; i++)
                    {
                        //是否包含此字段
                        if (fieldNams[keys[i]] == tempName)
                        {
                            //遍历角色
                            foreach (var item in roles)
                            {
                                if (flagWhere != 0)
                                {
                                    where += " or ";
                                }
                                flagWhere++;
                                if (item == "普通人员")
                                {
                                    //判断字段
                                    if (tempName == "Name")
                                    {
                                        where += "it. " + tempName + " =='" + ac.PersonName + "'";
                                        continue;
                                    }

                                }
                                if (item == "小管理员")
                                {
                                    //判断字段
                                    if (tempName == "Name")
                                    {
                                        where += "it. " + tempName + " is Not Null";
                                        continue;
                                    }
                                }
                            }
                        }

                    }

                }
            }
            if (where == "(")
            {
                return where.Replace("(", "");
            }
            return where + ")";
        }
    }
}

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