Whidbey Readiness Quiz (Answer): Converting array values
Well, lots of good responses… I can see this is going to be a hard group to stump. Nat nailed all the points quickly, even if it took him two posts to do it ;-)… there were several other great responses as well.
Here is the code I came up with… I wanted to high light three things:
- The “funcational” methods on Array… You can do some neat stuff with ConvertAll, ForEach and friends with C# new annonoums method support… give them a whirle and see what cool thigs you can come up with.
- TryParse()… It allows you to avoid catching and eating exceptions… bad programming practices and bad perf. If you find your self doing anything like this today you will love TryParse:
int i;
try
{
i = Int32.Parse("42");
}
catch (FormatException)
{
i = -1;
}
- Of couse, I have to plug a bit of Color console… you can’t do a reasonable whidbey CLR demo without it ;-)
using System;
class Program
{
static void Main(string[] args)
{
string[] inputValues = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "bad value" };
int[] outputValues;
outputValues = Array.ConvertAll<string, int>(inputValues, delegate(string value)
{
int i;
if (!Int32.TryParse(value, out i)) return -1;
return i;
});
Array.ForEach<int>(outputValues, delegate(int value)
{
if (value % 2 == 0) Console.ForegroundColor = ConsoleColor.Red;
else Console.ForegroundColor = ConsoleColor.White;
Console.Write(value + ",");
});
Console.ReadLine();
}
}
