我们在使用asp.net Web Form创建的Intranet网站中有一个错误。当用户下载Office程序文件（如.docx，.pptx等）附件时，会发生错误，并尝试打开该文件，该文件将被破坏。
首先，我认为该程序来自代码，因为我创建了独立的应用程序，使用此博客Save and Retrieve Files from SQL Server Database using ASP.Net从sqlServer上传和下载文件。独立应用程序工作正常，但当我将代码移植到主应用程序时，仍然会发生错误。
最后，我试着玩电脑和IE坐着使MS办公室程序是办公室相关文件的默认应用程序但没有用。 有人有这个bug的解决方案吗？
[
{
"code": 4210,
"msg": "Expression must be a group key or aggregate: (select (`b1`.`price`), (`b1`.`provider`), (`b1`.`bookingUrl`) from `bucket` as `b1` use keys (`b`.`offerIdentifier`) where ((`b1`.`flightCombinationIdentifier`) = (`b`.`flightCombinationIdentifier`))) order by (`b1`.`price`) limit 1) as `offer`",
"query_from_user": "select b.flightCombinationIdentifier,\n (\n select b1.price, b1.provider, b1.bookingUrl from bucket b1\n use keys b.offerIdentifier\n where b1.flightCombinationIdentifier = b.flightCombinationIdentifier\n order by b1.price asc\n limit 1\n ) as offer\n \nfrom bucket w\nwhere b.flyFrom = 'HAM' and b.flyTo = 'LGW'\ngroup by b.flightCombinationIdentifier"
}
]
行哈德斯
public partial class DownloadAttachment : IntranetPage
{
protected void Page_Load(object sender, EventArgs e)
{
int id = 0;
if (int.TryParse(Page.Request.QueryString["RecordID"], out id))
{
if (id > 0)
{
//GetDocument(id);
RetreiveFileFormDatabase(id);
}
}
Page.Response.End();
}
protected void GetDocument(int documentID)
{
try
{
Document downloadDoc = Document.GetDocument(documentID);
DocumentAttachment downloadAttachment =
DocumentAttachment.GetDocumentAttachment(downloadDoc.DocumentAttachmentID);
DocumentType downloadType = DocumentType.GetDocumentType(downloadAttachment.DocumentTypesID);
Response.Buffer = true;
Response.Charset = "";
Response.Cache.SetCacheability(HttpCacheability.ServerAndPrivate);
Response.ContentType = downloadType.ContentType;
Response.AddHeader("content-disposition", "attachment;filename=" + downloadAttachment.FileName);
Response.AddHeader("Content-Length", downloadAttachment.File.Length.ToString());
Response.BinaryWrite(downloadAttachment.File.ToArray());
Response.Flush();
Response.Close();
Response.End();
}
catch (Exception ex)
{
}
finally
{
Response.End();
}
}
protected void RetreiveFileFormDatabase(int id)
{
string strQuery = @"SELECT DA.[RecordID],DA.[FileName],DA.[DocumentTypesID],DA.[Path],DA.[File],DA.[Deleted],DA.[ModifiedBy],DA.[ModifiedOn],DA.[CreatedBy],DA.[CreatedOn],DA.[Timestamp],DT.[ContentType]
FROM [tblDocument_Attachments] DA
INNER JOIN [tblDocument_Types] DT
ON DA.[DocumentTypesID] = DT.[RecordID]
WHERE DA.[RecordID] = @id";
SqlCommand cmd = new SqlCommand(strQuery);
cmd.Parameters.Add("@id", SqlDbType.Int).Value = id;
DataTable dt = GetData(cmd);
if (dt != null)
{
Download(dt);
}
}
private void Download(DataTable dt)
{
Byte[] bytes = (Byte[])dt.Rows[0]["File"];
Response.Buffer = true;
Response.Charset = "";
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = dt.Rows[0]["ContentType"].ToString();
Response.AddHeader("content-disposition", "attachment;filename="
+ dt.Rows[0]["FileName"].ToString());
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();
}
private DataTable GetData(SqlCommand cmd)
{
DataTable dt = new DataTable();
string strConnString = System.Configuration.ConfigurationManager.ConnectionStrings["conn"].ConnectionString;
SqlConnection con = new SqlConnection(strConnString);
SqlDataAdapter sda = new SqlDataAdapter();
cmd.CommandType = CommandType.Text;
cmd.Connection = con;
try
{
con.Open();
sda.SelectCommand = cmd;
sda.Fill(dt);
return dt;
}
catch
{
return null;
}
finally
{
con.Close();
sda.Dispose();
con.Dispose();
}
}
}