.NET-SDK之如何实现管理文件（三）？

文件夹功能模拟


我们还可以通过 Delimiter 和 Prefix 参数的配合模拟出文件夹功能。Delimiter 和 Prefix 的组合效果是这样的：

• 如果把 Prefix 设为某个文件夹名，就可以罗列以此 Prefix 开头的文件，即该文件夹下递归的所有的文件和子文件夹。
• 如果再把 Delimiter 设置为“/”时，返回值就只罗列该文件夹下的文件，该文件夹下的子文件夹返回在 CommonPrefixes 部分，子文件夹下递归的文件和文件夹不被显示。假设Bucket中有4个文件： oss.jpg、fun/test.jpg、fun/movie/001.avi、fun/movie/007.avi ，我们把“/”符号作为文件夹的分隔符。

1. using Aliyun.OSS;
3. // 初始化OssClient
4. var client = new OssClient(endpoint, accessKeyId, accessKeySecret);
6. public void ListObject(string bucketName)
7. {
8.     try
9.     {
10.         ObjectListing result = null;
11.         string nextMarker = string.Empty;
12.         do
13.         {
14.             var listObjectsRequest = new ListObjectsRequest(bucketName)
15.             {
16.                 Marker = nextMarker,
17.                 MaxKeys = 100
18.             };
19.             result = client.ListObjects(listObjectsRequest);  
21.             Console.WriteLine("File:");
22.             foreach (var summary in result.ObjectSummaries)
23.             {
24.                 Console.WriteLine("Name:{0}", summary.Key);
25.             }
26.             nextMarker = result.NextMarker;
27.         } while (result.IsTruncated);
28.     }
29.     catch (Exception ex)
30.     {
31.         Console.WriteLine("List object failed. {0}", ex.Message);
32.     }
33. }

1. File:
2. Name:fun/movie/001.avi
3. Name:fun/movie/007.avi
4. Name:fun/test.jpg
5. Name:oss.jpg

1. using Aliyun.OSS;
3. // 初始化OssClient
4. var client = new OssClient(endpoint, accessKeyId, accessKeySecret);
6. public void ListObject(string bucketName)
7. {
8.     try
9.     {
10.         var listObjectsRequest = new ListObjectsRequest(bucketName)
11.         {
12.              Prefix = "fun/"
13.         };
14.         result = client.ListObjects(listObjectsRequest);
16.         Console.WriteLine("List object succeeded");
17.         Console.WriteLine("File:");
18.         foreach (var summary in result.ObjectSummaries)
19.         {
20.             Console.WriteLine("Name:{0}", summary.Key);
21.         }
23.         Console.WriteLine("Dir:");
24.         foreach (var prefix in result.CommonPrefixes)
25.         {
26.             Console.WriteLine("Name:{0}", prefix);
27.         }
28.     }
29.     catch (Exception ex)
30.     {
31.         Console.WriteLine("List object failed. {0}", ex.Message);
32.     }
33. }

1. List object succeeded
2. File:
3. Name:fun/movie/001.avi
4. Name:fun/movie/007.avi
5. Name:fun/test.jpg
7. 目录: