public static List<T> ConvertToEx<T>(DataTable dt) where T : new()
        {
            if (dt == null) return null;
            if (dt.Rows.Count <= 0) return null;

            List<T> list = new List<T>();
            Type type = typeof(T);
            PropertyInfo[] propertyInfos = type.GetProperties();  //获取泛型的属性
            List<DataColumn> listColumns = dt.Columns.Cast<DataColumn>().ToList();  //获取数据集的表头，以便于匹配
            T t;
            foreach (DataRow dr in dt.Rows)
            {
                t = new T();
                foreach (PropertyInfo propertyInfo in propertyInfos)
                {
                    try
                    {
                        DataColumn dColumn = listColumns.Find(name => name.ToString().ToUpper() == propertyInfo.Name.ToUpper());  //查看是否存在对应的列名

                        if (dColumn != null)
                        {
                            var uu = propertyInfo.PropertyType.Name;
                            if (uu == "Int32")
                            {
                                if (dr[propertyInfo.Name].ToString() != "")
                                {
                                    propertyInfo.SetValue(t, Convert.ToInt32(dr[propertyInfo.Name]), null);  //赋值
                                }
                            }
                            else if (uu == "Boolean")
                            {
                                if (dr[propertyInfo.Name].ToString() != "")
                                {
                                    propertyInfo.SetValue(t, Convert.ToBoolean(dr[propertyInfo.Name]), null);  //赋值
                                }
                            }
                            else if (uu == "Decimal")
                            {
                                if (dr[propertyInfo.Name].ToString() != "")
                                {
                                    propertyInfo.SetValue(t, Convert.ToDecimal(dr[propertyInfo.Name]), null);  //赋值
                                }
                            }
                            else if (uu == "Double")
                            {
                                if (dr[propertyInfo.Name].ToString() != "")
                                {
                                    propertyInfo.SetValue(t, Convert.ToDouble(dr[propertyInfo.Name]), null);  //赋值
                                }
                            }
                            else
                            {
                                if (!string.IsNullOrEmpty(dr[propertyInfo.Name].ToString()))
                                {
                                    propertyInfo.SetValue(t, dr[propertyInfo.Name], null);  //赋值
                                }
                            }

                        }
                    }
                    catch (Exception ex)
                    {
                        throw new Exception(ex.Message);
                    }
                }
                list.Add(t);
            }
            return list;
        }