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在async/await上尝试MSDN的例子时,为什么我在await运算符之后无法达到断点？

private static void Main(string[] args)
{
    AccessTheWebAsync();
}

private async Task<int> AccessTheWebAsync()
{ 
    // You need to add a reference to System.Net.Http to declare client.
    HttpClient client = new HttpClient();

    // GetStringAsync returns a Task<string>. That means that when you await the
    // task you'll get a string (urlContents).
    Task<string> getStringTask = client.GetStringAsync("http://msdn.microsoft.com");

    // You can do work here that doesn't rely on the string from GetStringAsync.
    /*** not relevant here ***/
    //DoIndependentWork();

    // The await operator suspends AccessTheWebAsync. …