C#读取数据库返回泛型集合详解(DataSetToList)

复制代码 代码如下:

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                IList list = GetList(System.Configuration.ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString,
               "select * from LYZX_NewsType");

                GridView1.DataSource = list;
                GridView1.DataBind();
            }
        }

        public string GetNewsTypeLink(ref string baseUrl,Guid newsType)
        {
            return "";
        }

        ///

        
        /// 获取泛型集合        
        /// ///

        
        /// /// 类型        
        /// /// 数据库连接字符串        
        /// 要查询的T-SQL        
        ///         
        public IList GetList(string connStr, string sqlStr)       
        {            
            using (SqlConnection conn = new SqlConnection(connStr))           
            {               
                using (SqlDataAdapter sda = new SqlDataAdapter(sqlStr, conn))               
                {                 
                    DataSet ds = new DataSet();                    
                    sda.Fill(ds);                   
                    return DataSetToList(ds, 0);               
                }           
            }      
        }

        ///

        
        /// DataSetToList        
        ///

         
        /// 转换类型        
        /// 数据源        
        /// 需要转换表的索引       
        /// /// 泛型集合
        public IList DataSetToList(DataSet dataset,int tableIndex)
        {
            //确认参数有效
            if (dataset==null || dataset.Tables.Count<=0|| tableIndex<0)
            {
                return null;
            }

            DataTable dt = dataset.Tables[tableIndex];

            IList list = new List();

            for (int i = 0; i < dt.Rows.Count; i++)
            {
                //创建泛型对象
                T _t=Activator.CreateInstance();

                //获取对象所有属性
                PropertyInfo [] propertyInfo=_t.GetType().GetProperties();

                //属性和名称相同时则赋值
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    foreach (PropertyInfo info in propertyInfo)
                    {
                        if (dt.Columns[j].ColumnName.ToUpper().Equals(info.Name.ToUpper()))
                        {
                            if (dt.Rows[i][j]!=DBNull.Value)
                            {
                                info.SetValue(_t, dt.Rows[i][j], null);
                            }
                            else
                            {
                                info.SetValue(_t, null, null);
                            }

                            break;
                        }
                    }
                }

                list.Add(_t);
            }

            return list;
        }