我有一个Person
表,其中包含以下列名:
我,姓名,Dob
我也有一个poco:
public class Person
{
public int Id {get; set;}
public string Name {get; set;}
public string DateOfBirth {get; set;}
}
我正在尝试:
var people = new List<Person>();
... // added a bunch of people
using (var bcp = new SqlBulkCopy(sqlConnection, SqlBulkCopyOptions.TableLock, transaction))
using (var reader = ObjectReader.Create(people, "Id", "Name", "Dob"))
{
bcp.BulkCopyTimeout = 120;
bcp.BatchSize = 0;
bcp.DestinationTableName = "Person";
bcp.WriteToServer(reader);
}
但是由于列名Dob
与属性名称DateOfBirth
不匹配,我得到了FastMember抛出的Index out of range
,如何在不重命名属性或列的情况下解决问题
请注意,我需要一个可以在运行时使用属性和列名称的答案,因为我当前正在使用ServiceStack Ormlite在运行时检索表元数据,而FastMember则在运行时再次使用ObjectReader。 / p>
非常感谢任何帮助。
答案 0 :(得分:5)
最后它变得比我想象的要简单得多:
// Get valid columns from the [targetTable] on the db at runtime
// and produce a simple mapping
// validColumns is an IDictionary<string, string>
var membersExposedToReader = validColumns.Keys.ToArray();
// data is an IEnumerable<T>
using (var bcp = new SqlBulkCopy(sqlConnection, SqlBulkCopyOptions.TableLock, tran))
using (var reader = ObjectReader.Create(data, membersExposedToReader))
{
foreach (var member in membersExposedToReader)
{
bcp.ColumnMappings.Add(member, validColumns[member]);
}
bcp.BulkCopyTimeout = 120;
bcp.BatchSize = 0;
bcp.DestinationTableName = targetTable;
bcp.WriteToServer(reader);
}
答案 1 :(得分:1)
使用简单的LINQ投影,您可以:
var people2 = people.Select(x => new { x.Id, x.Name, Dob = x.DateOfBirth });
然后
using (var reader = ObjectReader.Create(people2, "Id", "Name", "Dob"))