幾道C#題

一、以下代碼共創建了幾個Task？
[csharp] 
var tasks = Enumerable.Range(1, 1).Select(i => new Task(() => 
{ 
    Debug.WriteLine(i); 
})).ToList(); 
var ts1 = tasks.ToList(); 
var ts2 = tasks.ToArray(); 

二、找錯誤：
[csharp] 
var tasks = Enumerable.Range(1, 1).Select(i => new Task(() => 
{ 
    Debug.WriteLine(i); 
})); 
tasks.ToList().ForEach(t => t.Start()); 
Task.WaitAll(tasks.ToArray()); 
Console.WriteLine("完畢"); 

三、以下代碼在vs2010中的執行結果是？
[csharp] www.2cto.com
var sequence = Enumerable.Range(1, 2).ToList(); 
 
sequence.Select(i => new Action(() => Debug.WriteLine(i))).ToList().ForEach(a => a()); 
 
Action prints = null; 
foreach (var i in sequence) 
{ 
    prints += () => Debug.WriteLine(i); 
} 
prints();