我正在尝试访问 SqlServer FILESTREAM 表中的多个文件。此代码适用于 SqlDataReader 返回的文件数量相对较少的情况。大约 20 个文件。但是,当 SqlDataReader 返回几百条记录时,我在第一次通过 while 循环时收到此错误:“进程无法访问指定的文件,因为它已在另一个事务中打开。”
错误发生在这一行:
sfsList.Add(fileNameText, new SqlFileStream(filePath, txContext, FileAccess.Read));
有任何想法吗?
代码段如下:
int ProjectID;
int.TryParse(Request.QueryString["ProjectID"], out ProjectID);
string filePath = null;
byte[] txContext = null;
string fileNameText = null;
Dictionary<string, SqlFileStream> sfsList = new Dictionary<string, SqlFileStream>();
using (SqlConnection cn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["ATRD"].ToString()))
{
cn.Open();
using (SqlTransaction trn = cn.BeginTransaction("GetAllDocsTran"))
{
SqlCommand cmd = new SqlCommand("GetAllDocs", cn, trn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@ProjectID", ProjectID);
using (SqlDataReader reader = cmd.ExecuteReader())
{
try
{
while (reader.Read())
{
txContext = (reader["txContext"] as byte[]);
filePath = reader["filePath"].ToString();
fileNameText = reader["fileNameText"].ToString();
sfsList.Add(fileNameText, new SqlFileStream(filePath, txContext, FileAccess.Read));
}
}
catch (Exception ex)
{
Response.Write(ex.Message);
try
{
cmd.Transaction.Rollback();
}
catch (Exception ex2)
{
Response.Write(ex.Message + ex2.Message);
}
}
}
}
}