SampleApp.MainForm.loadButton_Click C# (CSharp) Method

        private void loadButton_Click( object sender, EventArgs e )
        {
			// show file selection dialog
            if ( openFileDialog.ShowDialog( ) == DialogResult.OK )
            {
                StreamReader reader = null;

                try
                {
                    // open selected file
                    reader = File.OpenText( openFileDialog.FileName );
                    string str = null;
                    // line counter
                    int lines = 0;
                    int j = 0;

                    // read the file
                    while ( ( str = reader.ReadLine( ) ) != null )
                    {
                        str = str.Trim( );

                        // skip comments and empty lines
                        if ( ( str == string.Empty ) || ( str[0] == ';' ) || ( str[0] == '\0' ) )
                            continue;

                        // split the string
                        string[] strs = str.Split( ' ' );

                        // check the line
                        if ( lines == 0 )
                        {
                            // get world size
                            mapWidth = int.Parse( strs[0] );
                            mapHeight = int.Parse( strs[1] );
                            map = new int[mapHeight, mapWidth];
                        }
                        else if ( lines == 1 )
                        {
                            // get agents count
                            if ( int.Parse( strs[0] ) != 1 )
                            {
                                MessageBox.Show( "The application supports only 1 agent in the worlds", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error );
                                break;
                            }
                        }
                        else if ( lines == 2 )
                        {
                            // agent position
                            agentStartX = int.Parse( strs[0] );
                            agentStartY = int.Parse( strs[1] );
                            agentStopX = int.Parse( strs[2] );
                            agentStopY = int.Parse( strs[3] );

                            // check position
                            if (
                                ( agentStartX < 0 ) || ( agentStartX >= mapWidth ) ||
                                ( agentStartY < 0 ) || ( agentStartY >= mapHeight ) ||
                                ( agentStopX < 0 ) || ( agentStopX >= mapWidth ) ||
                                ( agentStopY < 0 ) || ( agentStopY >= mapHeight )
                                )
                            {
                                MessageBox.Show( "Agent's start and stop coordinates should be inside the world area ", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error );
                                break;
                            }
                        }
                        else if ( lines > 2 )
                        {
                            // map lines
                            if ( j < mapHeight )
                            {
                                for ( int i = 0; i < mapWidth; i++ )
                                {
                                    map[j, i] = int.Parse( strs[i] );
                                    if ( map[j, i] > 1 )
                                        map[j, i] = 1;
                                }
                                j++;
                            }
                        }
                        lines++;
                    }

                    // set world's map
                    mapToDisplay = (int[,]) map.Clone( );
                    mapToDisplay[agentStartY, agentStartX] = 2;
                    mapToDisplay[agentStopY, agentStopX] = 3;
                    cellWorld.Map = mapToDisplay;

                    // show world's size
                    worldSizeBox.Text = string.Format( "{0} x {1}", mapWidth, mapHeight );

                    // enable learning button
                    startLearningButton.Enabled = true;
                }
                catch ( Exception )
                {
                    MessageBox.Show( "Failed reading the map file", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error );
                    return;
                }
                finally
                {
                    // close file
                    if ( reader != null )
                        reader.Close( );
                }
            }
        }