Get the file list under the server folder

// Time Selected
String Strdatenow;
Strdatenow = Calendar1.selecteddate. tow.datestring ();
// File name corresponding to the time
String Strrelfilename =   " Yujing- "   + Strdatenow +   " . Rel " ;
String Strjpgfilename =   " Disaster Warning chart- "   + Strdatenow +   " . Jpg " ;
// Whether a file exists
Bool Isexistrelfile =   False ;
Bool Isexistjpgfile =   False ;

// Prompt information
System. Text. stringbuilder strmsg =   New System. Text. stringbuilder ( " Query Information: <HR color = Red> " );

// File directory and name
String Strcurdir, filename, fileext;
// The default value is the directory of the current page.
Strcurdir = Server. mappath ( " Data/historymap/ " );

Fileinfo fi;
Directoryinfo dir;
// Create a directory reference object for the current directory
Directoryinfo dirinfo =   New Directoryinfo (strcurdir );

// Cyclically identifies objects of a specified date
Findfile # Region Findfile
Foreach (Filesysteminfo FSI In Dirinfo. getfilesysteminfos ())
{
Filename =   "" ;
Fileext =   "" ;
If (FSI Is Fileinfo)
{
Fi = (Fileinfo) FSI;
// Get File Name
Filename = Fi. Name;
// Get the file extension
Fileext = Fi. extension;
If (Fileext =   " . Rel " )
{
If (Filename = Strrelfilename)
{
Isexistrelfile= True;
}
}
If (Fileext =   " . Jpg " )
{
If (Filename = Strjpgfilename)
{
Isexistjpgfile= True;
}
}

}
Else // Otherwise, it is a directory.
{
Dir = (Directoryinfo) FSI;
// Get directory name
Filename = Dir. Name;
// Set the file extension to "folder"
Fileext =   " Folder " ;
}
}
# Endregion
// If both files exist
If (Isexistrelfile && Isexistjpgfile)
{
Strmsg. append (strdatenow +   " Warning chart query successful! " );
Strstate. Text = Strmsg. tostring ();
// Controls the map window to display the historical graph.
Showhistorymap # RegionShowhistorymap
//Code to be added
# Endregion
}
Else
{

Strmsg. append ( " Not found "   + Strdatenow +   " Warning chart! " );
Strstate. Text = Strmsg. tostring ();
}
}