没有参数

此示例显示如何创建封装返回当前时间的方法的委托

static DateTime UTCNow()
{
    return DateTime.UtcNow;
}

static DateTime LocalNow()
{
    return DateTime.Now;
}

static void Main(string[] args)
{
    Func<DateTime> method = UTCNow;
    // method points to the UTCNow method
    // that retuns current UTC time  
    DateTime utcNow = method();

    method = LocalNow;
    // now method points to the LocalNow method
    // that returns local time

    DateTime localNow = method();
}