/// <summary>
/// Connect to a stream of flat file data
/// </summary>
/// <param name="stream">The stream of data to connect to</param>
/// <returns>If the data was valid and is a stream</returns>
public override Boolean Connect(DataItemDefinition definition, DataConnection connection, Stream stream)
{
this.Connection = connection; // Blank out the connection string as we are using a stream instead
this.definition = definition; // Assign the definition to use
this.memoryData = new DataTable(); // Blank data by default
// Do we have a stream and a definition
if (stream != null && definition == null)
{
base.connected = true;
return(true);
}
else if (stream != null && definition != null)
{
stream.Position = 0; // Reset back to the start again in case someone else has read it
base.MarkLastAction(); // Tell the provider base class that it did something
// Read the data from the stream provided
using (StreamReader textReader = new StreamReader(stream))
{
this.memoryData = FixedWidthFileHelper.TextToDataTable(definition, connection, textReader.ReadToEnd());
base.connected = true; // Mark the provider as connected
return(true); // Connected without any errors
}
}
return(false); // Failed if we get to here
}
/// <summary>
/// Commit the data back to the file
/// </summary>
/// <returns>If the write was successful</returns>
public override Boolean Commit()
{
Boolean result = false; // Failed by default
// Generate the flat file content based on the definition when connecting
String flatFileContent = FixedWidthFileHelper.DataTableToString(this.definition, this.Connection, this.memoryData);
// Try and write the file to disk
try
{
// Get the processed connection string (with any injected items)
String connectionString = this.Connection.ConnectionStringProcessed;
// Write the file
File.WriteAllText(connectionString, flatFileContent, definition.EncodingFormat);
// Does the file now exist (and there were no errors writing)
result = File.Exists(connectionString);
}
catch
{
}
base.MarkLastAction(); // Tell the provider base class that it did something
// Return the result
return(result);
}
