Fixes for empty lists.

Author: rlhagerm

.doc_gen/metadata/s3_metadata.yaml

@@ -234,12 +234,16 @@ s3_CopyObject:
   languages:
     .NET:
       versions:
+        - sdk_version: 4
+          github: dotnetv4/S3
+          sdkguide:
+          excerpts:
+            - description: 
+              snippet_tags:
+                - S3.dotnetv4.S3_Basics-CopyObject
         - sdk_version: 3
           github: dotnetv3/S3
           excerpts:
-            - description:
-              snippet_tags:
-                - S3.dotnet35.CopyObject
             - description: Copy an object using a conditional request.
               genai: some
               snippet_tags:

dotnetv3/S3/README.md

@@ -33,7 +33,7 @@ For prerequisites, see the [README](../README.md#Prerequisites) in the `dotnetv3
 
 Code excerpts that show you how to call individual service functions.
 
-- [CopyObject](CopyObjectExample/CopyObject.cs#L11)
+- [CopyObject](scenarios/S3ConditionalRequestsScenario/S3ConditionalRequests/S3ActionsWrapper.cs#L137)
 - [CreateBucket](scenarios/S3ObjectLockScenario/S3ObjectLockWorkflow/S3ActionsWrapper.cs#L29)
 - [DeleteBucketCors](s3CORSExample/S3CORS.cs#L147)
 - [DeleteBucketLifecycle](LifecycleExample/Lifecycle.cs#L192)

dotnetv4/S3/README.md

@@ -40,12 +40,13 @@ Code examples that show you how to perform the essential operations within a ser
 
 Code excerpts that show you how to call individual service functions.
 
+- [CopyObject](Scenarios/S3_Basics/S3Bucket.cs#L134)
 - [CreateBucket](Scenarios/S3_Basics/S3Bucket.cs#L24)
 - [CreatePresignedPost](Scenarios/S3_CreatePresignedPost/S3Wrapper.cs#L35)
 - [DeleteBucket](Scenarios/S3_Basics/S3Bucket.cs#L261)
-- [DeleteObjects](Scenarios/S3_Basics/S3Bucket.cs#L224)
+- [DeleteObjects](Scenarios/S3_Basics/S3Bucket.cs#L225)
 - [GetObject](Scenarios/S3_Basics/S3Bucket.cs#L93)
-- [ListObjectsV2](Scenarios/S3_Basics/S3Bucket.cs#L175)
+- [ListObjectsV2](Scenarios/S3_Basics/S3Bucket.cs#L173)
 - [PutObject](Scenarios/S3_Basics/S3Bucket.cs#L54)
 
 ### Scenarios

dotnetv4/S3/Scenarios/S3_Basics/S3Bucket.cs

@@ -108,14 +108,12 @@ public async Task<bool> DownloadObjectFromBucketAsync(
         string objectName,
         string filePath)
     {
-        // Create a GetObject request
         var request = new GetObjectRequest
         {
             BucketName = bucketName,
             Key = objectName,
         };
 
-        // Issue request and remember to dispose of the response
         using GetObjectResponse response = await _amazonS3.GetObjectAsync(request);
 
         try
@@ -177,11 +175,10 @@ public async Task<bool> CopyObjectInBucketAsync(
     /// <summary>
     /// Shows how to list the objects in an Amazon S3 bucket.
     /// </summary>
-    /// <param name="bucketName">The name of the bucket for which to list
+    /// <param name="bucketName">The name of the bucket for which to list.
     /// the contents.</param>
-    /// <returns>A boolean value indicating the success or failure of the
-    /// copy operation.</returns>
-    public async Task<bool> ListBucketContentsAsync(string bucketName)
+    /// <returns>The collection of objects.</returns>
+    public async Task<List<S3Object>> ListBucketContentsAsync(string bucketName)
     {
         try
         {
@@ -199,23 +196,27 @@ public async Task<bool> ListBucketContentsAsync(string bucketName)
             {
                 BucketName = bucketName,
             });
-
+            var s3Objects = new List<S3Object>();
             await foreach (var response in listObjectsV2Paginator.Responses)
             {
-                Console.WriteLine($"HttpStatusCode: {response.HttpStatusCode}");
-                Console.WriteLine($"Number of Keys: {response.KeyCount}");
-                foreach (var entry in response.S3Objects)
+                if (response.S3Objects != null)
                 {
-                    Console.WriteLine($"Key = {entry.Key} Size = {entry.Size}");
+                    s3Objects.AddRange(response.S3Objects);
                 }
             }
 
-            return true;
+            Console.WriteLine($"Number of Objects: {s3Objects.Count}");
+            foreach (var entry in s3Objects)
+            {
+                Console.WriteLine($"Key = {entry.Key} Size = {entry.Size}");
+            }
+
+            return s3Objects;
         }
         catch (AmazonS3Exception ex)
         {
             Console.WriteLine($"Error encountered on server. Message:'{ex.Message}' getting list of objects.");
-            return false;
+            return null;
         }
     }
 
@@ -236,16 +237,15 @@ public async Task<bool> DeleteBucketContentsAsync(string bucketName)
         try
         {
             // Delete all objects in the bucket.
-            var deleteList = await _amazonS3.ListObjectsV2Async(new ListObjectsV2Request()
+            var deleteList = await ListBucketContentsAsync(bucketName);
+            if (deleteList != null && deleteList.Any())
             {
-                BucketName = bucketName,
-            });
-            await _amazonS3.DeleteObjectsAsync(new DeleteObjectsRequest()
-            {
-                BucketName = bucketName,
-                Objects = deleteList.S3Objects
-                    .Select(o => new KeyVersion { Key = o.Key }).ToList(),
-            });
+                await _amazonS3.DeleteObjectsAsync(new DeleteObjectsRequest()
+                {
+                    BucketName = bucketName,
+                    Objects = deleteList.Select(o => new KeyVersion { Key = o.Key }).ToList(),
+                });
+            }
 
             return true;
         }