之前实现的代码在 xls 文件中使用流将其保存到表中的列中,我使用相同的方法,但唯一的变化是保存的文件是 xlsm 或 xlsx 类型的文件,它保存到列中数据库
当我尝试从数据库中获取内容并抛出保存的 xlsm 文件或 xlsx 文件时,我收到错误消息“Excel 文件发现无法读取的内容是否要恢复此工作簿的内容?”
这是保存 xlsm 或 xlsx 文件的代码
System.IO.Stream filestream = System.IO.File.Open(file, System.IO.FileMode.Open);
int fileLength = (int)filestream.Length;
byte[] input = new byte[fileLength];
filestream.Read(input, 0, fileLength);
string Sql = "insert into upload values(@contents)";
con.Open();
System.Data.SqlClient.SqlCommand c = new System.Data.SqlClient.SqlCommand(Sql, con);
c.Parameters.Add("@contents", System.Data.SqlDbType.Binary);
c.Parameters["@contents"].Value = input;
c.ExecuteNonQuery();
检索并发送给用户
SqlCommand comm = new SqlCommand("select contents from upload order by id desc", con);
SqlDataReader reader = comm.ExecuteReader();
int bufferSize = 32768;
byte[] outbyte = new byte[bufferSize];
long retval;
long startIndex = 0;
startIndex = 0;
retval = reader.GetBytes(0, startIndex, outbyte, 0, bufferSize);
while (retval > 0)
{
System.Web.HttpContext.Current.Response.BinaryWrite(outbyte);
startIndex += bufferSize;
if (retval == bufferSize)
{
retval = reader.GetBytes(2, startIndex, outbyte, 0, bufferSize);
}
else
{
retval = 0;
}
}