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- Documentation
Torch Object StorageSDK Reference.NETObject InterfaceList ObjectsObject Enumeration (.NET SDK)
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Object Enumeration (.NET SDK)
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This document describes how to use ListObject to enumerate all objects within a specified bucket, files with a designated prefix, files and subdirectories within a specified directory.
Parameters
Parameter | Description |
Parameter | Description |
Prefix | The prefix of the current query results. |
Delimiter | Character used to group object names. |
Marker | Specifies where to start listing. Objects are listed in alphabetical order after the specified start. This is typically the value of next_marker returned by the previous request. |
MaxKeys | Returns the maximum number of objects to enumerate. Value: greater than 0 and less than or equal to 1000 Default value: 1000 |
EncodingType | Encode the returned content and specify the encoding type. Default value: None |
#{.custom-md-table}#
Sample Code
Brief Enumeration
The following code enumerates 10 objects in the specified bucket.
using System;
using TOS;
using TOS.Error;
using TOS.Model;
namespace ConsoleApp
{
internal class Program
{
private static void Main(string[] args)
{
var ak = Environment.GetEnvironmentVariable("TOS_ACCESS_KEY");
var sk = Environment.GetEnvironmentVariable("TOS_SECRET_KEY");
var endpoint = "https://tos-cn-beijing.volces.com";
var region = "cn-beijing";
var bucketName = "*** Provide your bucket name ***";
var client = TosClientBuilder.Builder().SetAk(ak).SetSk(sk).SetEndpoint(endpoint).SetRegion(region).Build();
try
{
var listObjectsInput = new ListObjectsInput()
{
Bucket = bucketName,
MaxKeys = 10
};
var listObjectsOutput = client.ListObjects(listObjectsInput);
foreach (var obj in listObjectsOutput.Contents)
{
Console.WriteLine("Object Key: {0}", obj.Key);
Console.WriteLine("Object LastModified: {0}", obj.LastModified);
Console.WriteLine("Object ETag: {0}", obj.ETag);
Console.WriteLine("Object Size: {0}", obj.Size);
Console.WriteLine("Object Owner: {0}", obj.Owner);
Console.WriteLine("Object StorageClass: {0}", obj.StorageClass);
Console.WriteLine("Object HashCrc64ecma: {0}", obj.HashCrc64ecma);
}
}
catch (TosServerException ex)
{
Console.WriteLine("ListObjects failed, request id {0}", ex.RequestID);
Console.WriteLine("ListObjects failed, status code {0}", ex.StatusCode);
Console.WriteLine("ListObjects failed, response error code {0}", ex.Code);
Console.WriteLine("ListObjects failed, response error message {0}", ex.Message);
}
catch (TosClientException ex)
{
Console.WriteLine("ListObjects failed, error message {0}", ex.Message);
}
catch (Exception ex)
{
Console.WriteLine("ListObjects failed, {0}", ex.Message);
}
}
}
}
Paginated Listing
The following code is used to paginate the listing of objects in a specified storage bucket, including retrieving the first 1,000 objects and then paginating to obtain the next 1,000 objects.
using System;
using TOS;
using TOS.Error;
using TOS.Model;
namespace ConsoleApp
{
internal class Program
{
private static void Main(string[] args)
{
var ak = Environment.GetEnvironmentVariable("TOS_ACCESS_KEY");
var sk = Environment.GetEnvironmentVariable("TOS_SECRET_KEY");
var endpoint = "https://tos-cn-beijing.volces.com";
var region = "cn-beijing";
var bucketName = "*** Provide your bucket name ***";
var client = TosClientBuilder.Builder().SetAk(ak).SetSk(sk).SetEndpoint(endpoint).SetRegion(region).Build();
try
{
var listObjectsInput = new ListObjectsInput()
{
Bucket = bucketName,
MaxKeys = 1000
};
var listObjectsOutput = client.ListObjects(listObjectsInput);
foreach (var obj in listObjectsOutput.Contents)
{
Console.WriteLine("Object Key: {0}", obj.Key);
Console.WriteLine("Object LastModified: {0}", obj.LastModified);
Console.WriteLine("Object ETag: {0}", obj.ETag);
Console.WriteLine("Object Size: {0}", obj.Size);
Console.WriteLine("Object Owner: {0}", obj.Owner);
Console.WriteLine("Object StorageClass: {0}", obj.StorageClass);
Console.WriteLine("Object HashCrc64ecma: {0}", obj.HashCrc64ecma);
}
listObjectsInput = new ListObjectsInput()
{
Bucket = bucketName,
MaxKeys = 1000,
Marker = listObjectsOutput.NextMarker
};
listObjectsOutput = client.ListObjects(listObjectsInput);
foreach (var obj in listObjectsOutput.Contents)
{
Console.WriteLine("Object Key: {0}", obj.Key);
Console.WriteLine("Object LastModified: {0}", obj.LastModified);
Console.WriteLine("Object ETag: {0}", obj.ETag);
Console.WriteLine("Object Size: {0}", obj.Size);
Console.WriteLine("Object Owner: {0}", obj.Owner);
Console.WriteLine("Object StorageClass: {0}", obj.StorageClass);
Console.WriteLine("Object HashCrc64ecma: {0}", obj.HashCrc64ecma);
}
}
catch (TosServerException ex)
{
Console.WriteLine("ListObjects failed, request id {0}", ex.RequestID);
Console.WriteLine("ListObjects failed, status code {0}", ex.StatusCode);
Console.WriteLine("ListObjects failed, response error code {0}", ex.Code);
Console.WriteLine("ListObjects failed, response error message {0}", ex.Message);
}
catch (TosClientException ex)
{
Console.WriteLine("ListObjects failed, error message {0}", ex.Message);
}
catch (Exception ex)
{
Console.WriteLine("ListObjects failed, {0}", ex.Message);
}
}
}
}
Enumerate all objects with the specified prefix
The following code is used to enumerate all objects in the storage bucket with the specified prefix.
using System;
using TOS;
using TOS.Error;
using TOS.Model;
namespace ConsoleApp
{
internal class Program
{
private static void Main(string[] args)
{
var ak = Environment.GetEnvironmentVariable("TOS_ACCESS_KEY");
var sk = Environment.GetEnvironmentVariable("TOS_SECRET_KEY");
var endpoint = "https://tos-cn-beijing.volces.com";
var region = "cn-beijing";
var bucketName = "*** Provide your bucket name ***";
var prefix = "*** Provide your object key prefix ***";
var client = TosClientBuilder.Builder().SetAk(ak).SetSk(sk).SetEndpoint(endpoint).SetRegion(region).Build();
try
{
var truncated = true;
var marker = "";
while (truncated)
{
var listObjectsInput = new ListObjectsInput()
{
Bucket = bucketName,
Prefix = prefix,
MaxKeys = 1000,
Marker = marker
};
var listObjectsOutput = client.ListObjects(listObjectsInput);
foreach (var obj in listObjectsOutput.Contents)
{
Console.WriteLine("Object Key: {0}", obj.Key);
Console.WriteLine("Object LastModified: {0}", obj.LastModified);
Console.WriteLine("Object ETag: {0}", obj.ETag);
Console.WriteLine("Object Size: {0}", obj.Size);
Console.WriteLine("Object Owner: {0}", obj.Owner);
Console.WriteLine("Object StorageClass: {0}", obj.StorageClass);
Console.WriteLine("Object HashCrc64ecma: {0}", obj.HashCrc64ecma);
}
truncated = listObjectsOutput.IsTruncated;
marker = listObjectsOutput.NextMarker;
}
}
catch (TosServerException ex)
{
Console.WriteLine("ListObjects failed, request id {0}", ex.RequestID);
Console.WriteLine("ListObjects failed, status code {0}", ex.StatusCode);
Console.WriteLine("ListObjects failed, response error code {0}", ex.Code);
Console.WriteLine("ListObjects failed, response error message {0}", ex.Message);
}
catch (TosClientException ex)
{
Console.WriteLine("ListObjects failed, error message {0}", ex.Message);
}
catch (Exception ex)
{
Console.WriteLine("ListObjects failed, {0}", ex.Message);
}
}
}
}
List all objects in the bucket with pagination
The following code is used to list all objects in the specified storage bucket with pagination.
using System;
using TOS;
using TOS.Error;
using TOS.Model;
namespace ConsoleApp
{
internal class Program
{
private static void Main(string[] args)
{
var ak = Environment.GetEnvironmentVariable("TOS_ACCESS_KEY");
var sk = Environment.GetEnvironmentVariable("TOS_SECRET_KEY");
var endpoint = "https://tos-cn-beijing.volces.com";
var region = "cn-beijing";
var bucketName = "*** Provide your bucket name ***";
var client = TosClientBuilder.Builder().SetAk(ak).SetSk(sk).SetEndpoint(endpoint).SetRegion(region).Build();
try
{
var truncated = true;
var marker = "";
while (truncated)
{
var listObjectsInput = new ListObjectsInput()
{
Bucket = bucketName,
MaxKeys = 1000,
Marker = marker
};
var listObjectsOutput = client.ListObjects(listObjectsInput);
foreach (var obj in listObjectsOutput.Contents)
{
Console.WriteLine("Object Key: {0}", obj.Key);
Console.WriteLine("Object LastModified: {0}", obj.LastModified);
Console.WriteLine("Object ETag: {0}", obj.ETag);
Console.WriteLine("Object Size: {0}", obj.Size);
Console.WriteLine("Object Owner: {0}", obj.Owner);
Console.WriteLine("Object StorageClass: {0}", obj.StorageClass);
Console.WriteLine("Object HashCrc64ecma: {0}", obj.HashCrc64ecma);
}
truncated = listObjectsOutput.IsTruncated;
marker = listObjectsOutput.NextMarker;
}
}
catch (TosServerException ex)
{
Console.WriteLine("ListObjects failed, request id {0}", ex.RequestID);
Console.WriteLine("ListObjects failed, status code {0}", ex.StatusCode);
Console.WriteLine("ListObjects failed, response error code {0}", ex.Code);
Console.WriteLine("ListObjects failed, response error message {0}", ex.Message);
}
catch (TosClientException ex)
{
Console.WriteLine("ListObjects failed, error message {0}", ex.Message);
}
catch (Exception ex)
{
Console.WriteLine("ListObjects failed, {0}", ex.Message);
}
}
}
}
List the files and subdirectories in the specified directory.
TOS recognizes only the concept of objects. Directory functionality can be simulated by creating an object with a size of zero and a name ending with a slash (/).
The functionality of a directory can be simulated using the Delimiter and Prefix parameters, as explained below:
- Set Delimiter to/At the same time, if Prefix is set to empty, the objects and subdirectory information in the root directory will be returned.
- Set Delimiter to/At the same time, set Prefix to the subdirectory subfiledir; the objects and subdirectories within the subdirectory will be returned.
The following code enumerates the objects and subdirectories within the directory.
using System;
using TOS;
using TOS.Error;
using TOS.Model;
namespace ConsoleApp
{
internal class Program
{
private static void Main(string[] args)
{
var ak = Environment.GetEnvironmentVariable("TOS_ACCESS_KEY");
var sk = Environment.GetEnvironmentVariable("TOS_SECRET_KEY");
var endpoint = "https://tos-cn-beijing.volces.com";
var region = "cn-beijing";
var bucketName = "*** Provide your bucket name ***";
var client = TosClientBuilder.Builder().SetAk(ak).SetSk(sk).SetEndpoint(endpoint).SetRegion(region).Build();
try
{
var truncated = true;
var marker = "";
while (truncated)
{
var listObjectsInput = new ListObjectsInput()
{
Bucket = bucketName,
MaxKeys = 1000,
Delimiter = "/",
Marker = marker
};
var listObjectsOutput = client.ListObjects(listObjectsInput);
foreach (var obj in listObjectsOutput.CommonPrefixes)
{
Console.WriteLine("Sub Dir: {0}", obj.Prefix);
}
foreach (var obj in listObjectsOutput.Contents)
{
Console.WriteLine("Obj: {0}", obj.Key);
}
truncated = listObjectsOutput.IsTruncated;
marker = listObjectsOutput.NextMarker;
}
}
catch (TosServerException ex)
{
Console.WriteLine("ListObjects failed, request id {0}", ex.RequestID);
Console.WriteLine("ListObjects failed, status code {0}", ex.StatusCode);
Console.WriteLine("ListObjects failed, response error code {0}", ex.Code);
Console.WriteLine("ListObjects failed, response error message {0}", ex.Message);
}
catch (TosClientException ex)
{
Console.WriteLine("ListObjects failed, error message {0}", ex.Message);
}
catch (Exception ex)
{
Console.WriteLine("ListObjects failed, {0}", ex.Message);
}
}
}
}
Last updated: 2025.09.23 11:28:05
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