OutOfMemory Error with Repository.Diff.Compare<Patch>(...)

I get an OutOfMemoryException from Repository.Diff with v0.22.0:

LibGit2Sharp.LibGit2SharpException: Out of memory
   at LibGit2Sharp.Core.Ensure.HandleError(Int32 result) in c:\Git\libgit2sharp\LibGit2Sharp\Core\Ensure.cs:line 160
   at LibGit2Sharp.Core.Proxy.git_patch_from_diff(DiffSafeHandle diff, Int32 idx) in c:\Git\libgit2sharp\LibGit2Sharp\Core\Proxy.cs:line 1555
   at LibGit2Sharp.PatchStats..ctor(DiffSafeHandle diff) in c:\Git\libgit2sharp\LibGit2Sharp\PatchStats.cs:line 31
   at LibGit2Sharp.Diff.<.cctor>b__1d(DiffSafeHandle diff) in c:\Git\libgit2sharp\LibGit2Sharp\Diff.cs:line 106
   at LibGit2Sharp.Diff.BuildDiffResult[T](DiffSafeHandle diff) in c:\Git\libgit2sharp\LibGit2Sharp\Diff.cs:line 120
   at LibGit2Sharp.Diff.Compare[T](Tree oldTree, Tree newTree, IEnumerable`1 paths, ExplicitPathsOptions explicitPathsOptions, CompareOptions compareOptions) in c:\Git\libgit2sharp\LibGit2Sharp\Diff.cs:line 246
   at LibGit2Sharp.Diff.Compare[T](Tree oldTree, Tree newTree) in c:\Git\libgit2sharp\LibGit2Sharp\Diff.cs:line 157
   at ABB.QueryManager.Models.Git.GitCodeChurnToCsvConverter.<GetRowData>d__7.MoveNext() in C:\Workspace\Source\TeamMetrics\QueryManager\QueryManager\Models\Git\GitCodeChurnToCsvConverter.cs:line 52

I'm trying to produce some basic code churn statistics from a Git repository. As some context, I'm implementing this in an ASP.NET application in a Hangfire job.

For each branch, I'm iterating over all of the commits and comparing them to their predecessor. I generate a patch per commit, and generate data for each file path in the commit. Here is the code I'm using:

foreach (var branch in repo.Branches.Where(b => b.Tip.Committer.When >= startDate))
{
	Commit nextCommit = null;
	foreach (var currentCommit in branch.Commits.Where(c => c.Committer.When >= startDate))
	{
		if(null == nextCommit)
		{
			foreach (var change in repo.Diff.Compare<Patch>(currentCommit.Tree, nextCommit.Tree))
			{
				var data = new string[]
				{
					nextCommit.Id.Sha,
					branch.FriendlyName,
					change.Path,
					change.Status.ToString(),
					change.IsBinaryComparison.ToString(),
					GetFileSize(nextCommit, change.Path).ToString(),
					GetLineCount(nextCommit, change.Path).ToString(),
					change.LinesAdded.ToString(),
					change.LinesDeleted.ToString()
				}
				yield return data;
			}
		}
		nextCommit = currentCommit;
	}
}

I found this related Stack Overflow question: libgit2sharp.Patch outofmemory. I tried changing my code to produce both a TreeChanges and a PatchStats, but it fails as well.

Bắt đầu bằng cách lần theo đường dẫn lời gọi được báo cáo qua Core/Ensure.cs, Core/Proxy.cs, PatchStats.cs và Diff.cs, sau đó xem lại cuộc thảo luận Stack Overflow được liên kết. Tái hiện lỗi bằng Repository.Diff.Compare trên một repository có lịch sử commit tương đương và xác định thao tác nào giữ lại quá nhiều bộ nhớ. Công việc được xem là hoàn tất khi phép so sánh hoàn thành mà không xảy ra OutOfMemoryException đã báo cáo và đã bổ sung kiểm thử hồi quy cho trường hợp bị lỗi.