/// <summary>
        /// Gets the files modified by the pull request.
        /// </summary>
        /// <returns>The collection of the modified files paths.</returns>
        public IEnumerable <FilePath> GetModifiedFiles()
        {
            if (!this.ValidatePullRequest())
            {
                return(new List <FilePath>());
            }

            var targetVersionDescriptor = new GitTargetVersionDescriptor
            {
                VersionType = GitVersionType.Commit,
                Version     = this.LastSourceCommitId,
            };

            var baseVersionDescriptor = new GitBaseVersionDescriptor
            {
                VersionType = GitVersionType.Commit,
                Version     = this.LastTargetCommitId,
            };

            using (var gitClient = this.gitClientFactory.CreateGitClient(this.CollectionUrl, this.credentials))
            {
                var commitDiffs =
                    gitClient
                    .GetCommitDiffsAsync(
                        this.ProjectName,
                        this.RepositoryId,
                        true, // bool? diffCommonCommit
                        null, // int? top
                        null, // int? skip
                        baseVersionDescriptor,
                        targetVersionDescriptor,
                        null) // object userState
                    .ConfigureAwait(false)
                    .GetAwaiter()
                    .GetResult();

                this.log.Verbose(
                    "Found {0} changed file(s) in the pull request",
                    commitDiffs.Changes.Count());

                if (!commitDiffs.ChangeCounts.Any())
                {
                    return(new List <FilePath>());
                }

                return
                    (from change in commitDiffs.Changes
                     where
                     change != null &&
                     !change.Item.IsFolder
                     select
                     new FilePath(change.Item.Path.TrimStart('/')));
            }
        }
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        /// <inheritdoc />
        protected override IEnumerable <FilePath> InternalGetModifiedFilesInPullRequest()
        {
            if (!this.PullRequestSystem.ValidatePullRequest())
            {
                return(new List <FilePath>());
            }

            this.Log.Verbose("Computing the list of files changed in this pull request...");

            var targetVersionDescriptor = new GitTargetVersionDescriptor
            {
                VersionType = GitVersionType.Commit,
                Version     = this.PullRequestSystem.TfsPullRequest.LastSourceCommitId
            };

            var baseVersionDescriptor = new GitBaseVersionDescriptor
            {
                VersionType = GitVersionType.Commit,
                Version     = this.PullRequestSystem.TfsPullRequest.LastTargetCommitId
            };

            using (var gitClient = this.PullRequestSystem.CreateGitClient())
            {
                var commitDiffs = gitClient.GetCommitDiffsAsync(
                    this.PullRequestSystem.TfsPullRequest.ProjectName,
                    this.PullRequestSystem.TfsPullRequest.RepositoryId,
                    true, // bool? diffCommonCommit
                    null, // int? top
                    null, // int? skip
                    baseVersionDescriptor,
                    targetVersionDescriptor,
                    null, // object userState
                    CancellationToken.None).Result;

                this.Log.Verbose(
                    "Found {0} changed file(s) in the pull request",
                    commitDiffs.Changes.Count());

                if (!commitDiffs.ChangeCounts.Any())
                {
                    return(new List <FilePath>());
                }

                return
                    (from change in commitDiffs.Changes
                     where
                     change != null &&
                     !change.Item.IsFolder
                     select
                     new FilePath(change.Item.Path.TrimStart('/')));
            }
        }
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        public GitCommitDiffs GetGitCommitDiffsByBranch()
        {
            GitCommitDiffs diffs;

            using (var client = new GitHttpClient(_uri, _credentials))
            {
                var baseVersion = new GitBaseVersionDescriptor {
                    Version = _configuration.GitBaseVersionBranch
                };
                var targetVersion = new GitTargetVersionDescriptor {
                    Version = _configuration.GitTargetVersionBranch
                };

                diffs = client.GetCommitDiffsAsync(
                    _configuration.Project,
                    _configuration.GitRepositoryId,
                    baseVersionDescriptor: baseVersion,
                    targetVersionDescriptor: targetVersion)
                        .Result;
            }

            return(diffs);
        }