将列表<T>转换为数据表 C# - 未找到属性

Question

我正在尝试将列表转换为数据表。我当前的代码如下所示，但是 GetProperties(BindingFlags.Public | BindingFlags.Instance) 不返回任何属性。

订购对象：

class Order
    {
        public string SSCC;
        public string Code;
        public string ToSiteMaterial;
        public string ToSiteProductCode;
        public string FromSiteMaterial;
        public string FromSiteProductCode;
        public string Weight;
        public string Prday;
        public string Expire1;
        public string Expire2;
        public string Expire3;
        public string slday;
        public string UnitExternalBatch;
        public string UnitLotOverride;
        public string PalletSSCC;
        public string PalletID;
        public DateTime CreatedDateTime;
        public string processed;
        public string verified;
        public string PackErrorMessage;
        public string PalletErrorMessage;
        public string LinkErrorMessage;
        public string NewPackSSCC;
        public string Tare;
        public string Manufacturer;
        public string IntakeLabelLayout;
        public string Pieces;
        public string TimesProcessed;
        public string FixedCode;
    }

1) List<Order> OrdersToProcess = new List<Order>();

2) BulkInsert(OrdersToProcess, "TestTableName");

3) private void BulkInsert(List<Order> orders, string tablename)
        {
            DataTable pDt = ToDataTable(orders);
            //new IsoDateTimeConverter { DateTimeFormat = "dd/MM/yyyy" });
            var constr = ConnectionStringGoesHere

            using (SqlConnection connection = new SqlConnection(constr))
            using (SqlBulkCopy bulkCopy = new SqlBulkCopy(connection))
            {
                connection.Open();
                bulkCopy.DestinationTableName = tablename;              
                // How many records to send to the database in one go (all of them)
                bulkCopy.BatchSize = 100000;
                bulkCopy.BulkCopyTimeout = 999999999;

                // Load the data to the database
                bulkCopy.WriteToServer(pDt);

                // Close up          
                bulkCopy.Close();
                connection.Close();
            }
        }



4) public DataTable ToDataTable<T>(IList<T> items)
        {
            DataTable dataTable = new DataTable(typeof(T).Name);
            //Get all the properties
            PropertyInfo[] Props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
            foreach (PropertyInfo prop in Props)
            {
                //Setting column names as Property names
                dataTable.Columns.Add(prop.Name);
            }
            foreach (T item in items)
            {
                var values = new object[Props.Length];
                for (int i = 0; i < Props.Length; i++)
                {
                    //inserting property values to datatable rows
                    values[i] = Props[i].GetValue(item, null);
                }
                dataTable.Rows.Add(values);
            }
            //put a breakpoint here and check datatable
            return dataTable;
        }

任何建议都会非常有帮助。

我正在尝试通过从列表的属性中提取列和值来将列表转换为数据表。

Answer 1

在 Order 类中只有字段。我建议使用

.GetFields()

方法

public DataTable ToDataTable<T>(IList<T> items)
        {
            DataTable dataTable = new DataTable(typeof(T).Name);
            //Get all the properties. Fixed here ------------
            PropertyInfo[] Props = typeof(T).GetFields(BindingFlags.Public | BindingFlags.Instance); 
            //Gain fields instead of properties -------------
            foreach (PropertyInfo prop in Props)
            {
                //Setting column names as Property names
                dataTable.Columns.Add(prop.Name);
            }
            foreach (T item in items)
            {
                var values = new object[Props.Length];
                for (int i = 0; i < Props.Length; i++)
                {
                    //inserting property values to datatable rows
                    values[i] = Props[i].GetValue(item, null);
                }
                dataTable.Rows.Add(values);
            }
            //put a breakpoint here and check datatable
            return dataTable;
        }

至于

ToDataTable

方法中的 null 异常。我不确定，但尝试将

<Order>

类型放入代码中的通用类型括号中

private void BulkInsert(List<Order> orders, string tablename)
        {
            //Put here -------------------------------------------------------------------
            DataTable pDt = ToDataTable<Order>(orders);
            //new IsoDateTimeConverter { DateTimeFormat = "dd/MM/yyyy" }); ---------------
            var constr = ConnectionStringGoesHere

            using (SqlConnection connection = new SqlConnection(constr))
            using (SqlBulkCopy bulkCopy = new SqlBulkCopy(connection))
            {
                connection.Open();
                bulkCopy.DestinationTableName = tablename;              
                // How many records to send to the database in one go (all of them)
                bulkCopy.BatchSize = 100000;
                bulkCopy.BulkCopyTimeout = 999999999;

                // Load the data to the database
                bulkCopy.WriteToServer(pDt);

                // Close up          
                bulkCopy.Close();
                connection.Close();
            }
        }

在我的代码中，我尝试为整个方法赋予任何价值。每次它都没有变得空