无法从任务列表中导致

Question

我有这个async函数返回一个Task

public async Task<SettingModel> GetSetting(string key) 
{ 
    var rootPath = _hostingEnvironment.ContentRootPath; 
    using (StreamReader r = new StreamReader(rootPath + key + "settings.json")) 
    { 
     string json = await r.ReadToEndAsync(); 
     var settings = JsonConvert.DeserializeObject<SettingModel>(json); 
     return settings; 
    } 
} 

现在，我想所有的设置，然后等待直到所有完成这样

public async Task GetData(List<string> keys) 
{ 
    var taskList = new List<Task>(); 
    foreach(var key in keys) 
    { 
     taskList.Add(GetSetting(key)); 
    } 

    await Task.WhenAll(taskList.ToList()); 

    foreach (var task in taskList) 
    { 
     task.Result // here its not working. The task don't have a result :(
    } 
} 

如何从任务中获取数据？

Answer 1

将您的taskList更改为List<Task<SettingModel>>并且也不要使用task.Result以避免Deadlock。你的代码应该是这样的：

var taskList = new List<Task<SettingModel>>(); 

foreach(var key in keys) 
{ 
    taskList.Add(GetSetting(key)); 
} 

var result = await Task.WhenAll(taskList.ToList()).ConfigureAwait(false);