/// <summary>
/// Deletes the customer.
/// </summary>
internal async void DeleteCustomer()
{
try
{
DateTime?result = await Task.Run(() => ClientDataAccessManager.DataAccessInstance.RemoveCustomer(this.SelectedCustomer));
if (result != null)
{
string message = string.Format("Customer {0} has been removed", this.SelectedCustomer.Name);
InfoDialogViewModel.ShowDialog(message, "Remove successful");
}
else
{
string message = "Remove customer failed";
InfoDialogViewModel.ShowDialog(message, "Remove failed");
}
this.SelectedCustomer = null;
this.GetData();
}
catch (Exception ex)
{
InfoDialogViewModel.ShowDialog(ex.Message, "Unhandled Exception");
Log.LogException(ex, "MainViewModel.cs");
}
}
/// <summary>
/// Invokes the update customer window.
/// </summary>
internal void UpdateCustomer()
{
try
{
// Make a copy of the current customer to avoid directly editing the customer in the data grid.
// The customer will be modified in the cache and in the database
// and the grid view will be updated from the cache or the database.
Customer c = new Customer();
c.Copy(this.SelectedCustomer);
AddCustomerView addCustomerView = new AddCustomerView();
AddCustomerViewModel addCustomerViewModel = new AddCustomerViewModel(c);
addCustomerViewModel.SaveCompleted += (s, e) =>
{
// Get latest data after save.
this.SelectedCustomer = null;
addCustomerView.Close();
this.GetData();
};
addCustomerViewModel.Cancelled += (s, e) =>
{
this.SelectedCustomer = null;
addCustomerView.Close();
};
addCustomerView.DataContext = addCustomerViewModel;
addCustomerView.ShowDialog();
this.SelectedCustomer = null;
}
catch (Exception ex)
{
InfoDialogViewModel.ShowDialog(ex.Message, "Unhandled Exception");
Log.LogException(ex, "MainViewModel.cs");
}
}
/// <summary>
/// Invokes the add new customer window .
/// </summary>
internal void AddCustomer()
{
try
{
AddCustomerView addCustomerView = new AddCustomerView();
// Set the date of birth to today, so it's not set to default 01/01/0001
Customer customer = new Customer()
{
DateOfBirth = DateTime.Now
};
AddCustomerViewModel addCustomerViewModel = new AddCustomerViewModel(customer);
addCustomerViewModel.SaveCompleted += (s, e) =>
{
// Get latest data after save.
this.SelectedCustomer = null;
addCustomerView.Close();
this.GetData();
};
addCustomerViewModel.Cancelled += (s, e) =>
{
this.SelectedCustomer = null;
addCustomerView.Close();
};
addCustomerView.DataContext = addCustomerViewModel;
addCustomerView.ShowDialog();
}
catch (Exception ex)
{
InfoDialogViewModel.ShowDialog(ex.Message, "Unhandled Exception");
Log.LogException(ex, "MainViewModel.cs");
}
}
/// <summary>
/// Saves the customer selected on the view model.
/// </summary>
internal async void SaveCustomer()
{
try
{
string message;
// There is an id so send update request.
// New user has no Id. It will be autogenerated by the data base.
this.BusyStart();
if (this.selectedCustomer.Id > 0)
{
// Update the customer.
DateTime?updateResult = await Task.Run(() =>
ClientDataAccessManager.DataAccessInstance.UpdateCustomer(this.selectedCustomer, cancelSaveOperation.Token));
this.BusyStop();
if (updateResult != null)
{
message = string.Format("Customer {0} has been updated", this.selectedCustomer.Name);
InfoDialogViewModel.ShowDialog(message, "Update successful");
}
else
{
message = string.Format("Customer {0} - update failed", this.selectedCustomer.Name);
InfoDialogViewModel.ShowDialog(message, "Update failed");
}
}
else
{
// Inser a new customer.
DateTime?addResult = await Task.Run(() =>
ClientDataAccessManager.DataAccessInstance.AddCustomer(this.selectedCustomer, cancelSaveOperation.Token));
this.BusyStop();
if (addResult != null)
{
message = string.Format("Customer {0} has been added", this.selectedCustomer.Name);
InfoDialogViewModel.ShowDialog(message, "Save successful");
}
else
{
message = string.Format("Customer {0} - add operation failed", this.selectedCustomer.Name);
InfoDialogViewModel.ShowDialog(message, "Save failed");
}
}
this.OnSaveCompleted();
}
catch (OperationCanceledException e)
{
// Don't log the cancellation exception as it is requested by the user.
InfoDialogViewModel.ShowDialog(e.Message, "Unhandled exception");
}
catch (Exception e)
{
InfoDialogViewModel.ShowDialog(e.Message, "Unhandled exception");
Log.LogException(e, "AddCustomerViewModel.cs");
}
}
/// <summary>
/// Invokes the window with statistical data for the users.
/// </summary>
internal void ShowStats()
{
try
{
StatsView statsView = new StatsView();
StatsViewModel statsViewModel = new StatsViewModel(this.customers);
statsView.DataContext = statsViewModel;
statsView.ShowDialog();
}
catch (Exception ex)
{
InfoDialogViewModel.ShowDialog(ex.Message, "Unhandled Exception");
Log.LogException(ex, "MainViewModel.cs");
}
}
/// <summary>
/// Invokes the window displaying the modification history in the csv format.
/// </summary>
internal async void DisplayModificationHistory()
{
try
{
string modificationHistoryText = await Task.Run(() => ClientDataAccessManager.DataAccessInstance.GetModificationHistory());
ModificationHistoryView modificationHistoryView = new ModificationHistoryView();
ModificationHistoryViewModel modificationHistoryViewModel = new ModificationHistoryViewModel(modificationHistoryText);
modificationHistoryView.DataContext = modificationHistoryViewModel;
modificationHistoryView.ShowDialog();
}
catch (Exception ex)
{
InfoDialogViewModel.ShowDialog(ex.Message, "Unhandled Exception");
Log.LogException(ex, "MainViewModel.cs");
}
}
/// <summary>
/// Requests data from the data base and refreshes data grid.
/// </summary>
internal async void GetData()
{
try
{
this.IsRequestingData = true;
this.customersBuckup = await Task.Run(() => ClientDataAccessManager.DataAccessInstance.GetCustomers());
// Assignment to Customers is redundant as the filter will do it
// But if filter is already empty it won't change the state of the
// DataGrid therefore refresh the data grid here.
this.Customers = null;
this.Customers = this.customersBuckup;
// Clear filter in case a user typed anything in.
this.Filter = string.Empty;
this.IsRequestingData = false;
// Forcing the CommandManager to raise the RequerySuggested event
CommandManager.InvalidateRequerySuggested();
}
catch (Exception ex)
{
InfoDialogViewModel.ShowDialog(ex.Message, "Unhandled Exception");
Log.LogException(ex, "MainViewModel.cs");
}
}
