Before getting started

Skill Level: Beginner

Assumptions:

1. You already gone through Part 1 – Creating a Bucket and Part 2 – Deleting a Bucket

Additional information: I sometimes cover small sub-topics in a post. Along with AWS, you will also be exposed to:

• async, await, Task
• Rhyous.SimpleArgs

Step 1 – Add a ListFiles method to BucketManager.cs

1. Edit file called BucketManager.cs.
2. Enter this new method:

           public static async Task ListFiles(AmazonS3Client client, string bucketName)
           {
               var listResponse = await client.ListObjectsV2Async(new ListObjectsV2Request { BucketName = bucketName });
               if (listResponse.S3Objects.Count > 0)
               {
                   Console.WriteLine($"Listing items in S3 bucket: {bucketName}");
                   listResponse.S3Objects.ForEach(o => Console.WriteLine(o.Key));
               }
           }
   

   Note: I noticed there was a ListObjectsAsync and a ListObjectsV2Async. I assumed the one with V2 is newer and should be used for new code. The documentation for ListObjectsV2Async confirmed this.

Step 2 – Update the Action Argument

We now need to make this method a valid action for the Action Argument.

1. Edit the ArgsHandler.cs file to define an Action argument.

                       ...
                       AllowedValues = new ObservableCollection<string>
                       {
                           "CreateBucket",
                           "DeleteBucket",
                           "ListFiles"
                       },
                       ...
   

Notice: We didn’t have a step 3. We wrote some S.O.L.I.D. code in Part 1 and Part 2, which made it really easy for us to implement this method.

Homework: I also read in the documentation that only 1000 files will be listed when a call to ListObjectsV2Async is made. What if you have more than 1000 files, how would you list them all?

Go to: Part 4 – Uploading a file to a Bucket

Return to: Managing Amazon AWS with C#