通用 class 用于将对象列表转换为 IEnumerable<SqlDataRecord>

Question

我有这个对象：

public class ConsentData
{
    public string ConsentName { get; set; }
    public bool ConsentValue { get; set; }
    public DateTime ConsentDate { get; set; }
}

我应该通过 table 值参数将同意数据列表传递给 SQL 服务器中的存储过程。

寻找一种方法来转换 SqlDataRecord 列表中的 ConsentData 列表，我在网上找到了这个通用的 class：

public class SqlTableValueSupport<T> : List<T>, IEnumerable<SqlDataRecord> where T : class, new()
    {
        IEnumerator<SqlDataRecord> IEnumerable<SqlDataRecord>.GetEnumerator()
        {
            //Create Columns (SqlMetaData)
            List<SqlMetaData> records = new List<SqlMetaData>();
            var properties = typeof(T).GetProperties();
            foreach (var prop in properties)
            {
                SqlDbType sdbtyp = GetSqlType(prop.PropertyType);
                records.Add(new SqlMetaData(prop.Name, sdbtyp));
            }

            //Create records/rows (SqlDataRecord)
            SqlDataRecord ret = new SqlDataRecord(records.ToArray());

            foreach (T data in this)
            {
                for (int i = 0; i < properties.Length; i++)
                {
                    ret.SetValue(i, properties[i].GetValue(data, null));
                }

                yield return ret;
            }
        }

        // Map C# Types to SqlDbType
        private SqlDbType GetSqlType(Type type)
        {
            SqlDbType val = SqlDbType.VarChar;
            if (type == typeof(Int64) || type == typeof(Nullable<Int64>))
            {
                val = SqlDbType.BigInt;
            }
            else if (type == typeof(Byte[]))
            {
                val = SqlDbType.Binary;
            }
            else if (type == typeof(Boolean) || type == typeof(Nullable<Boolean>))
            {
                val = SqlDbType.Bit;
            }
            else if (type == typeof(DateTime) || type == typeof(Nullable<DateTime>))
            {
                val = SqlDbType.DateTime;
            }
            else if (type == typeof(Decimal))
            {
                val = SqlDbType.Decimal;
            }
            // Please refer to the following document to add other types
            // http://msdn.microsoft.com/en-us/library/ms131092.aspx
            return val;
        }
    }

我想知道如何使用 class，如何传递 ConsentData 列表并检索 SqlDataRecord 列表？

Answer 1

最后，我通过静态方法处理class解决了问题。这是 class:

public class SqlTableValueSupport<T> where T : class
{
    public static DataTable ConvertData(List<T> ValuesList)
    {
        DataTable dtData = new DataTable();
        var objectReference = ValuesList.GetType().GetGenericArguments()[0];
        var properties = objectReference.GetProperties();
        foreach (var prop in properties)
        {
            dtData.Columns.Add(prop.Name, prop.PropertyType);
        }

        foreach (var item in ValuesList)
        {
            var dataArray = new List<object>();
            foreach (var prop in properties)
            {
                dataArray.Add(prop.GetValue(item));
            }

            dtData.Rows.Add(dataArray.ToArray());
        }

        return dtData;
    }
}

方法调用方式如下

var ListOfMyObjectDT = SqlTableValueSupport<MyObject>.ConvertData(ListOfMyObject);

通用 class 用于将对象列表转换为 IEnumerable<SqlDataRecord>

Generic class for convert list of object to IEnumerable<SqlDataRecord>

c#

sql-server

generics

table-valued-parameters