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

Beginne damit, den gemeldeten Aufrufpfad durch Core/Ensure.cs, Core/Proxy.cs, PatchStats.cs und Diff.cs nachzuverfolgen, und sieh dir anschließend die verlinkte Stack-Overflow-Diskussion an. Reproduziere den Fehler mit Repository.Diff.Compare in einem Repository mit vergleichbarer Commit-Historie und ermittle, welcher Vorgang übermäßig viel Speicher beibehält. Als erledigt gilt die Aufgabe, wenn der Vergleich ohne die gemeldete OutOfMemoryException abgeschlossen wird und eine Regressionstestabdeckung für den fehlschlagenden Fall hinzugefügt wurde.

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.