Mega Code Archive
0187 Func and Action
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C# System namespace defines several generic delegates to convert almost all possible method signatures.
delegate TResult Func <out TResult> ();
delegate TResult Func <in T, out TResult> (T arg);
delegate TResult Func <in T1, in T2, out TResult> (T1 arg1, T2 arg2);
... and so on, up to T16
delegate void Action ();
delegate void Action <in T> (T arg);
delegate void Action <in T1, in T2> (T1 arg1, T2 arg2);
... and so on, up to T16
We can rewrite the printer delegate as follows.
using System;
class Test
{
static void output(int[] intArray, Action<int> p)
{
foreach (int i in intArray)
{
p(i);
}
}
static void consolePrinterInt(int i)
{
Console.WriteLine(i);
}
static void Main()
{
Action<int> p = consolePrinterInt;
int[] intArray = new int[] { 1, 2, 3 };
output(intArray, p);
}
}
The output:
1
2
3
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