Silverlight 3 File Dialog Box - silverlight-3.0

Question

Ok - I have a WCF Service which reads an excel file from a certain location and strips the data into an object. What I need is the ability to allow users of my program to Upload an excel sheet to the file location that my Service uses.
Alternitivley I could pass the Uploaded excel sheet to the service directly.
Can anyone help with this. My service code is:
public List<ImportFile> ImportExcelData(string FileName)
{
//string dataSource = Location + FileName;
string dataSource = Location;
string conStr = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + dataSource.ToString() + ";Extended Properties=Excel 8.0;";
var con = new OleDbConnection(conStr);
con.Open();
var data = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
var sheetName = data.Rows[0]["TABLE_NAME"].ToString();
OleDbCommand cmd = new OleDbCommand("SELECT * FROM [" + sheetName + "] WHERE Status = '4'", con);
OleDbDataAdapter oleda = new OleDbDataAdapter();
oleda.SelectCommand = cmd;
DataSet ds = new DataSet();
oleda.Fill(ds, "Employees");
DataTable dt = ds.Tables[0];
var _impFiles = new List<ImportFile>();
foreach (DataRow row in dt.Rows)
{
var _import = new ImportFile();
_import.PurchaseOrder = row[4].ToString();
try
{
var ord = row[8].ToString();
DateTime dati = Convert.ToDateTime(ord);
_import.ShipDate = dati;
}
catch (Exception)
{
_import.ShipDate = null;
}
ImportFile additionalData = new ImportFile();
additionalData = GetAdditionalData(_import.PurchaseOrder);
_import.NavOrderNo = additionalData.NavOrderNo;
_import.IsInstall = additionalData.IsInstall;
_import.SalesOrderId = additionalData.SalesOrderId;
_import.ActivityID = additionalData.ActivityID;
_import.Subject = additionalData.Subject ;
_import.IsMatched = (_import.ShipDate != null & _import.NavOrderNo != "" & _import.NavOrderNo != null & _import.ShipDate > DateTime.Parse("01/01/1999") ? true : false);
_import.UpdatedShipToField = false;
_import.UpdatedShipToFieldFailed = false;
_import.CreateNote = false;
_import.CreateNoteFailed = false;
_import.CompleteTask = false;
_import.CompleteTaskFailed = false;
_import.FullyCompleted = 0;
_import.NotCompleted = false;
_impFiles.Add(_import);
}
oleda.Dispose();
con.Close();
//File.Delete(dataSource);
return _impFiles;
}

Answer 1

You will want to modify your service to accept a Stream instead of a filename, then you can save if off to a file (or parse it directly from the Stream, although I don't know how to do that).
Then in your Silverlight app you could do something like this:
private void Button_Click(object sender, RoutedEventArgs ev)
{
var dialog = new OpenFileDialog();
dialog.Filter = "Excel Files (*.xls;*.xlsx;*.xlsm)|*.xls;*.xlsx;*.xlsm|All Files (*.*)|*.*";
if (dialog.ShowDialog() == true)
{
var fileStream = dialog.File.OpenRead();
var proxy = new WcfService();
proxy.ImportExcelDataCompleted += (s, e) =>
{
MessageBox.Show("Import Data is at e.Result");
// don't forget to close the stream
fileStream.Close();
};
proxy.ImportExcelDataAsync(fileStream);
}
}
You could also have your WCF service accept a byte[] and do something like this.
private void Button_Click(object sender, RoutedEventArgs ev)
{
var dialog = new OpenFileDialog();
dialog.Filter = "Excel Files (*.xls;*.xlsx;*.xlsm)|*.xls;*.xlsx;*.xlsm|All Files (*.*)|*.*";
if (dialog.ShowDialog() == true)
{
var length = dialog.File.Length;
var fileContents = new byte[length];
using (var fileStream = dialog.File.OpenRead())
{
if (length > Int32.MaxValue)
{
throw new Exception("Are you sure you want to load > 2GB into memory. There may be better options");
}
fileStream.Read(fileContents, 0, (int)length);
}
var proxy = new WcfService();
proxy.ImportExcelDataCompleted += (s, e) =>
{
MessageBox.Show("Import Data is at e.Result");
// no need to close any streams this way
};
proxy.ImportExcelDataAsync(fileContents);
}
}
Update
Your service could look like this:
public List<ImportFile> ImportExcelData(Stream uploadedFile)
{
var tempFile = HttpContext.Current.Server.MapPath("~/uploadedFiles/" + Path.GetRandomFileName());
try
{
using (var tempStream = File.OpenWrite(tempFile))
{
uploadedFile.CopyTo(tempStream);
}
//string dataSource = Location + FileName;
string dataSource = tempFile;
string conStr = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + dataSource.ToString() +
";Extended Properties=Excel 8.0;";
var con = new OleDbConnection(conStr);
con.Open();
}
finally
{
if (File.Exists(tempFile))
File.Delete(tempFile);
}
}

Answer 2

Thanks Bendewey that was great. Had to amend it slightly -
My Service:
var tempFile = #"c:\temp\" + Path.GetRandomFileName();
try
{
int length = 256;
int bytesRead = 0;
Byte[] buffer = new Byte[length];
// write the required bytes
using (FileStream fs = new FileStream(tempFile, FileMode.Create))
{
do
{
bytesRead = uploadedFile.Read(buffer, 0, length);
fs.Write(buffer, 0, bytesRead);
}
while (bytesRead == length);
}
uploadedFile.Dispose();
string conStr = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + dataSource.ToString() + ";Extended Properties=Excel 8.0;";
var con = new OleDbConnection(conStr);
Thanks Again for your help