若只是需要大批量插入数据使用bcp是最好的，若同时需要插入、删除、更新建议使用SqlDataAdapter我测试过有很高的效率，一般情况下这两种就满足需求了
bcp方式
复制代码 代码如下:
/// <summary>
/// 大批量插入数据(2000每批次)
/// 已采用整体事物控制
/// </summary>
/// <param name="connString">数据库链接字符串</param>
/// <param name="tableName">数据库服务器上目标表名</param>
/// <param name="dt">含有和目标数据库表结构完全一致(所包含的字段名完全一致即可)的DataTable</param>
public static void BulkCopy(string connString, string tableName, DataTable dt)
{
using (SqlConnection conn = new SqlConnection(connString))
{
conn.Open();
using (SqlTransaction transaction = conn.BeginTransaction())
{
using (SqlBulkCopy bulkCopy = new SqlBulkCopy(conn, SqlBulkCopyOptions.Default, transaction))
{
bulkCopy.BatchSize = 2000;
bulkCopy.BulkCopyTimeout = _CommandTimeOut;
bulkCopy.DestinationTableName = tableName;
try
{
foreach (DataColumn col in dt.Columns)
{
bulkCopy.ColumnMappings.Add(col.ColumnName, col.ColumnName);
}
bulkCopy.WriteToServer(dt);
transaction.Commit();
}
catch (Exception ex)
{
transaction.Rollback();
throw ex;
}
finally
{
conn.Close();
}
}
}
}
}

SqlDataAdapter
复制代码 代码如下:
/// <summary>
/// 批量更新数据(每批次5000)
/// </summary>
/// <param name="connString">数据库链接字符串</param>
/// <param name="table"></param>
public static void Update(string connString, DataTable table)
{
SqlConnection conn = new SqlConnection(connString);
SqlCommand comm = conn.CreateCommand();
comm.CommandTimeout = _CommandTimeOut;
comm.CommandType = CommandType.Text;
SqlDataAdapter adapter = new SqlDataAdapter(comm);
SqlCommandBuilder commandBulider = new SqlCommandBuilder(adapter);
commandBulider.ConflictOption = ConflictOption.OverwriteChanges;
try
{
conn.Open();
//设置批量更新的每次处理条数
adapter.UpdateBatchSize = 5000;
adapter.SelectCommand.Transaction = conn.BeginTransaction();/////////////////开始事务
if (table.ExtendedProperties["SQL"] != null)
{
adapter.SelectCommand.CommandText = table.ExtendedProperties["SQL"].ToString();
}
adapter.Update(table);
adapter.SelectCommand.Transaction.Commit();/////提交事务
}
catch (Exception ex)
{
if (adapter.SelectCommand != null && adapter.SelectCommand.Transaction != null)
{
adapter.SelectCommand.Transaction.Rollback();
}
throw ex;
}
finally
{
conn.Close();
conn.Dispose();
}
}