連鎖繼續與任務

Question

我有以下兩個任務的示例。第一個完成時，第二個應該使用第一個結果。我在這個領域II新，如果有人指導我如何IT連鎖將不勝感激：

public async Task<string> UploadFile(string containerName, IFormFile file) 
    { 
     //string blobPath = ""; 
     var container = GetContainer(containerName); 
     var fileName = file.FileName; 
     CloudBlockBlob blob = container.GetBlockBlobReference(fileName); 
     using (var memoryStream = new MemoryStream()) 
     { 
      // await file.CopyToAsync(memoryStream); 
      // await blob.UploadFromStreamAsync(memoryStream); 

      // upload only when the 'memoryStream' is ready 
      Task.Factory.StartNew(() => file.CopyToAsync(memoryStream)) 
       .ContinueWith(m => blob.UploadFromStreamAsync(m.Result)); // ?? 
     } 
     return blob.Uri.AbsoluteUri; 
    } 

如果沒有第二方案：

public string UploadFile(string containerName, IFormFile file) 
{ 
    var container = GetContainer(containerName); 
    var fileName = file.FileName; 
    CloudBlockBlob blob = container.GetBlockBlobReference(fileName); 
    using (var memoryStream = new MemoryStream()) 
    { 
     file.CopyToAsync(memoryStream).Wait(); 
     blob.UploadFromStreamAsync(memoryStream).Wait(); 

     //Task.Factory.StartNew(() => file.CopyToAsync(memoryStream)) 
     // .ContinueWith(m => blob.UploadFromStreamAsync(m.Result)); // ?? 
    } 
    return blob.Uri.AbsoluteUri; 
} 

Answer 1

從IFormFile獲取流，並直接上傳

public async Task<string> UploadFile(string containerName, IFormFile file) 
{ 
    //string blobPath = ""; 
    var container = GetContainer(containerName); 
    var fileName = file.FileName; 
    CloudBlockBlob blob = container.GetBlockBlobReference(fileName); 
    await blob.UploadFromStreamAsync(file.OpenReadStream()) 
    return blob.Uri.AbsoluteUri; 
}