C#反射应用

public class DatatableListHelper<T>
    {
        public static DataTable GetDataTableHelper(List<T> items)
        {
            DataTable dt = new DataTable();
            Type t = items[0].GetType();
            PropertyInfo[] pis = t.GetProperties();
            foreach (PropertyInfo pi in pis)
            {
                dt.Columns.Add(pi.Name);
            }

            foreach (T item in items)
            {
                DataRow dr = dt.NewRow();
                foreach (PropertyInfo pi in pis)
                {
                    object obj = pi.GetValue(item, null);
                    switch (pi.PropertyType.Name.ToString().ToLower())
                    {
                        case "datetime" :
                            dr[pi.Name] = Convert.ToDateTime(obj).ToString("yyyy-MM-dd");
                            break;
                        case "int32":
                            dr[pi.Name] = Convert.ToInt32(obj);
                            break;
                        case "double":
                            dr[pi.Name] = Convert.ToDouble(obj);
                            break;
                        default:
                            dr[pi.Name] = obj;
                            break;
                    }
                }
                dt.Rows.Add(dr);
            }
            return dt;
        }
    }