/////////////////////////////////////////////////////////////////////////////////////
#region [ Load/Save Database Methods ]
/// <summary>
/// Loads database from file.
/// </summary>
///
private void LoadDatabase(string filename, string caption, bool silent = false)
{
string progressInfo = "Loading database from '" + filename + "'...";
// Remove children from client area (probably referring to the contents
// of the current database)
//
UnloadAllMdiChildForms();
// Create progress bar
//
MyProgressBar progress = new MyProgressBar(this, progressInfo);
Exception lastException = null;
VideoRentalOutlet loadedStore = null;
string elapsedTime = string.Empty;
// Deserialize database using our file stream with progress info.
//
try
{
FileInfo fileInfo = new FileInfo(filename);
long fileLength = fileInfo.Exists ? fileInfo.Length : 0;
using (FileStreamWithProgressBar fs = new FileStreamWithProgressBar(
filename, FileMode.Open, progress, fileLength)
)
{
loadedStore = VideoRentalOutlet.Deserialize(fs);
fs.StopTimer();
elapsedTime = " in " + fs.VerboseElapsedTime;
}
}
catch (Exception ex)
{
lastException = ex;
}
progress.Quit();
if (loadedStore != null)
{
VideoStore = loadedStore;
VideoStore.Changed += VideoStore_Changed;
string info = VideoStore.TotalRecordsCount.ToString()
+ " records loaded from '" + filename + "'" + elapsedTime;
if (silent)
{
this.InfoMessage = info;
}
else
{
info += "\n\n\n" + VideoStore.StatisticsInfo(info.Length) + "\n";
MessageBox.Show(info, caption,
MessageBoxButtons.OK, MessageBoxIcon.Information);
}
UpdateTitle();
}
else if (lastException != null)
{
MessageBox.Show(
"There was an error while loading database.\n\n"
+ "Filename: " + filename + "\n\n"
+ "System Message:\n\n"
+ lastException.Message,
caption, MessageBoxButtons.OK, MessageBoxIcon.Hand);
}
}
/////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Serializes database to file.
/// </summary>
///
private void SaveDatabase(string filename, string caption, bool silent = false)
{
// Create progress bar
string progressInfo = "Saving database to '" + filename + "'...";
// Create progress bar
//
MyProgressBar progress = new MyProgressBar(this, progressInfo);
Exception lastException = null;
bool succeded = false;
string elapsedTime = string.Empty;
// Serialize database using our file stream with progress info.
//
try
{
FileInfo fileInfo = new FileInfo(filename);
long fileLength = fileInfo.Exists ? fileInfo.Length : 0;
// Anticipate file length based on records count (if file length is 0
// or there was significant increase in database)
//
fileLength = Math.Max(VideoStore.TotalRecordsCount * 160, fileLength);
using (FileStreamWithProgressBar fs = new FileStreamWithProgressBar(
filename, FileMode.Create, progress, fileLength)
)
{
VideoStore.Serialize(fs);
succeded = true;
fs.StopTimer();
elapsedTime = " in " + fs.VerboseElapsedTime;
}
}
catch (Exception ex)
{
lastException = ex;
}
progress.Quit();
// Report status
//
if (succeded)
{
string info = VideoStore.TotalRecordsCount.ToString()
+ " records saved to '" + filename + "'" + elapsedTime;
if (silent)
{
this.InfoMessage = info;
}
else
{
MessageBox.Show(
info + "\n\n\n" + VideoStore.StatisticsInfo(info.Length) + "\n",
caption, MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
else if (lastException != null)
{
MessageBox.Show(
"There was an error while saving database.\n\n"
+ "Filename: " + filename + "\n\n"
+ "System Message:\n" + lastException.Message,
caption, MessageBoxButtons.OK, MessageBoxIcon.Hand);
}
}
