/// <summary>
/// Handle the type selection changed.
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
private void OnTypeSelectionChanged(object sender, SelectionChangedEventArgs args)
{
// Find a child data-grid of the tab control
DataGrid membersDataGrid = (DataGrid)MemberTypeTabControl.GetChildren().Find(control => control is DataGrid);
if (membersDataGrid.SelectedItem == null)
{
return;
}
Type newType = (Type)TypeSelectionComboBox.SelectedItem;
Member member = (Member)membersDataGrid.SelectedItem;
// No change in type means that we don't need to do anything
if (newType == member.GetType())
{
return;
}
Team team = (Team)TeamSelectionComboBox.SelectedItem;
// Remove the member from the old type and move it to the new type collection in the team member map
team.RemoveMember(member.GetType(), member);
// Convert the member to its respective type via casting
Member newMember = new Member();
if (newType == typeof(Wrestler))
{
newMember = new Wrestler();
}
else if (newType == typeof(Coach))
{
newMember = new Coach();
}
// Copy the values from the old member to the converted member
newMember.FirstName = member.FirstName;
newMember.LastName = member.LastName;
newMember.Gender = member.Gender;
newMember.School = member.School;
newMember.YearsOfExperience = member.YearsOfExperience;
team.AddMember(newType, newMember);
}
/// <summary>
/// Loads a <see cref="Team"/> from the data file at the specified <paramref name="filepath"/>.
/// </summary>
/// <remarks>
/// In most cases, even if there is an error reading a specific line of the data file,
/// the rest of the file will stead be read since that data could fine; hence, the return value
/// will often not be <value>null</value>, even if errors were encountered.
/// </remarks>
/// <param name="filepath">The path to the data file.</param>
/// <returns>A <see cref="Team"/> object containing the loaded data or <value>null</value> if the <see cref="Team"/> could not be loaded.</returns>
public static Team Load(string filepath)
{
if (!File.Exists(filepath))
{
Logger.Log(string.Empty, $"Failed to load team: data file (\"{filepath}\") does not exist.",
LoggerVerbosity.Error, LoggerDestination.Form);
return(null);
}
// While there are manual sanity checks during deserialization,
// let's wrap the deserialization procedure in a try-catch block
// so that we can catch any missed exceptions. Since an exception
// caught by this try-catch is unexpected, if it does happen, it is
// treated as severe and ends the loading of the file (returns null).
try
{
// The name of the team is the same as the data file name without its extension.
Team result = new Team(Path.GetFileNameWithoutExtension(filepath), filepath);
int errorCount = 0;
string[] lines = File.ReadAllLines(filepath);
for (int i = 0; i < lines.Length; i++)
{
// The team format consists of a set of lines where each
// line contains a set of comma-separated values, with the first
// value indicating the type of the member: "Coach" or "Wrestler"
string line = lines[i];
string[] components = line.Split(',');
// Temporary error message buffer used to reduce
// string interning overhead
string errorMessage;
// Check if our line is empty or consists of no comma-separated values.
// If this is the case, skip this line and continue reading the file and log
// the error. This is not very severe so we don't log the error to the form via
// message box.
if (components.Length == 0)
{
errorMessage = $"Encountered empty line on line {i + 1}.\n\n(\"{filepath}\")";
Logger.LogFunctionEntry(string.Empty, errorMessage, LoggerVerbosity.Warning);
errorCount += 1;
continue;
}
string lineWithoutType = line.Substring(components[0].Length + 1);
// If we encounter a member type that is not "Coach" or "Wrestler", let's log this encounter
// and the line that it occured, and then continue reading the file. This sort of error is not
// very severe since it only affects a single line; that is, the rest of the data might still be A-OK.
switch (components[0])
{
case Coach.SerializationTypeTag:
Coach coach = new Coach();
if (!coach.Load(lineWithoutType))
{
errorMessage = $"Failed to load Coach on line {i + 1}.";
Logger.LogFunctionEntry(string.Empty, errorMessage, LoggerVerbosity.Error);
errorCount += 1;
}
result.AddMember(coach);
break;
case Wrestler.SerializationTypeTag:
Wrestler wrestler = new Wrestler();
if (!wrestler.Load(lineWithoutType))
{
errorMessage = $"Failed to load Wrestler on line {i + 1}.";
Logger.LogFunctionEntry(string.Empty, errorMessage, LoggerVerbosity.Error);
errorCount += 1;
}
result.AddMember(wrestler);
break;
default:
Logger.LogFunctionEntry(string.Empty, $"Encountered unknown member type (\"{components[0]}\") while " +
$"loading a team data file on line {i + 1}.\n(\"{filepath}\")",
LoggerVerbosity.Warning);
errorCount += 1;
break;
}
}
if (errorCount > 0)
{
Logger.Log(string.Empty, $"{errorCount} errors while loading team!\n\nView log for more details.",
LoggerVerbosity.Warning, LoggerDestination.Form);
}
return(result);
}
catch (Exception exception)
{
Logger.Log(exception.Message, LoggerVerbosity.Error);
Logger.Log(string.Empty, $"Caught exception while loading team. Team could not be loaded.\n\nView log for more details.",
LoggerVerbosity.Error, LoggerDestination.Form);
return(null);
}
}