Loading Levels from Files - Learning C# by Programming Games - page 301

the player solved the level or not. As you can see, this contents represents the state
where the player starts the game for the first time. In other words: all levels but the
first one are locked, and none of the levels are solved.
We can load this status information after we have loaded all the levels, and up-
date all the Level objects. For that, we added a method LoadLevelsStatus method and
added it to the PlayingState class. In this method, we again create an instance of
the StreamReader class, and we read the lines from the text file. We use the Split
method from the string type to split the lines into separate strings, and we then use
bool .Parse to convert these strings to boolean values. We then pass along these val-
ues to the Locked and Solved properties of the different levels. The complete method
is given as follows:
public void LoadLevelsStatus( string path)
{
StreamReader fileReader = new StreamReader(path);
for ( int i = 0; i < levels.Count; i++)
{
string line = fileReader.ReadLine();
string [] elems = line.Split(',');
if (elems.Length == 2)
{
levels[i].Locked = bool .Parse(elems[0]);
levels[i].Solved = bool .Parse(elems[1]);
}
}
fileReader.Close();
}
In a similar way, we can create a method WriteLevelsStatus that uses a StreamWriter to
write the current status of all the levels to a file. Here is the complete method:
public void WriteLevelsStatus( string path)
{
StreamWriter fileWriter = new StreamWriter(path, false );
for ( int i = 0; i < levels.Count; i++)
{
string line = levels[i].Locked.ToString() + "," + levels[i].Solved.ToString();
fileWriter.WriteLine(line);
}
fileWriter.Close();
}
In the WriteLevelsStatus method, we go the other way round. We create the writer
object, then we create the strings representing the status for each level, which are
then written to the file. We pass a boolean value as a parameter to the StreamWriter
constructor to indicate that we do not want to append something to the file, but that
we want to overwrite the file with new contents. After writing the level status to the