/*
* Read name pairs in from a file in the following
* format: "lastName, firstName"
*/
public static NamePair[] readFile(string filePath, char[] split)
{
List<NamePair> names = new List<NamePair>();
string[] lines;
try
{
lines = File.ReadAllLines(filePath);
foreach(string s in lines)
{
NamePair name = new NamePair();
string[] temp = s.Split(split);
// If a name does not have two parts,
// leave the field as null and handle
// formatting later.
if(temp.Length >= 1)
{
name.lastName = temp[0].Trim();
if(temp.Length >= 2)
{
name.firstName = temp[1].Trim();
}
}
names.Add(name);
}
}
catch(ArgumentException)
{
Console.WriteLine("Invalid file path");
Environment.Exit(1);
}
catch(DirectoryNotFoundException)
{
Console.WriteLine("Invalid file path");
Environment.Exit(1);
}
catch(IOException)
{
Console.WriteLine("Invalid file path");
Environment.Exit(1);
}
catch(UnauthorizedAccessException)
{
Console.WriteLine("Could not open the file " + filePath + " due to authorisation errors");
Environment.Exit(1);
}
return names.ToArray();
}
/*
* Write the data out to a given file in the following format
* "lastName, firstname"
*/
public static void writeFile(string filePath, NamePair[] names)
{
StreamWriter output;
try
{
output = new StreamWriter(filePath);
foreach(NamePair name in names)
{
// If a given name doesn't have a field
// specified, skip it
if(name.lastName != null)
{
output.Write(name.lastName);
}
output.Write(", ");
if(name.firstName != null)
{
output.Write(name.firstName);
}
output.WriteLine();
}
output.Close();
}
catch(ArgumentException)
{
Console.WriteLine("Invalid file path");
Environment.Exit(1);
}
catch(DirectoryNotFoundException)
{
Console.WriteLine("Invalid file path");
Environment.Exit(1);
}
catch(IOException)
{
Console.WriteLine("Invalid file path");
Environment.Exit(1);
}
catch(UnauthorizedAccessException)
{
Console.WriteLine("Could not open the file " + filePath + " due to authorisation errors");
Environment.Exit(1);
}
}
/*
* Order a set of names by last name, then firstname lexicographically.
*/
public static NamePair[] orderNames(NamePair[] names)
{
// let the compiler handle the type of linq expressions. They can
// be fiendishly difficult to get right.
var sortedNames =
from name in names
orderby name.lastName ascending, name.firstName ascending
select name;
return sortedNames.ToArray();
}