我有这段代码:
private async Task<DataSharedTheatres.TheatresPayload> GetTheatres()
{
var callMgr = new ApiCallsManager();
var fileMgr = new FileSystemManager();
string cachedTheatres = fileMgr.ReadFile(Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "TheatreTemp.txt"));
if (string.IsNullOrEmpty(cachedTheatres))
{
**string generalModelPull = await callMgr.GetData(new Uri("somecrazyapi.com/api" + apiAccessKey));**
bool saveResult = fileMgr.WriteToFile(Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "TheatreTemp.txt"), generalModelPull);
if (!saveResult)
{
testText.Text = "Failed to load Theatre Data";
return null;
}
cachedTheatres = fileMgr.ReadFile(Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "TheatreTemp.txt"));
}
return Newtonsoft.Json.JsonConvert.DeserializeObject<DataSharedTheatres.TheatresPayload>(cachedTheatres);
**}**
我在第一个突出显示的行(它命中)上设置了断点,然后按F10,调试器跳转到最后一个括号!我不明白为什么。
GetData方法:
public async Task<string> GetData(Uri source)
{
if (client.IsBusy)
client.CancelAsync ();
string result = await client.DownloadStringTaskAsync (source);
return result;
}
答案 0 :(得分:5)
因为那是&#34;等待&#34;确实。当你使用&#34; await&#34;在异步方法中,它告诉编译器您希望该方法在该点返回,然后仅在等待&#34;等待的时候重新输入该方法。任务已经完成。