Captures console output.

Util.Capture.cs

using System;
using System.IO;

partial class Util {

    /// <summary>
    /// Captures console output.
    /// </summary>
    public static string Capture(Action action) {
        var before = Console.Out;
        using (var after = new StringWriter()) {
            Console.SetOut(after);
            try {
                action();
            } finally {
                Console.SetOut(before);
            }
            return after.ToString();
        }
    }
}