From 505ec800da7b55876099ceb63548d1428da51c7e Mon Sep 17 00:00:00 2001
From: andy840119 <andy840119@gmail.com>
Date: Sun, 30 Oct 2022 16:29:54 +0800
Subject: [PATCH] File name should be nullable.

---
 osu.Game/Rulesets/Edit/Checks/CheckAudioPresence.cs      | 2 +-
 osu.Game/Rulesets/Edit/Checks/CheckBackgroundPresence.cs | 2 +-
 osu.Game/Rulesets/Edit/Checks/CheckFilePresence.cs       | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/osu.Game/Rulesets/Edit/Checks/CheckAudioPresence.cs b/osu.Game/Rulesets/Edit/Checks/CheckAudioPresence.cs
index 94c48c300a..e922ddf023 100644
--- a/osu.Game/Rulesets/Edit/Checks/CheckAudioPresence.cs
+++ b/osu.Game/Rulesets/Edit/Checks/CheckAudioPresence.cs
@@ -10,6 +10,6 @@ namespace osu.Game.Rulesets.Edit.Checks
     {
         protected override CheckCategory Category => CheckCategory.Audio;
         protected override string TypeOfFile => "audio";
-        protected override string GetFilename(IBeatmap beatmap) => beatmap.Metadata?.AudioFile;
+        protected override string? GetFilename(IBeatmap beatmap) => beatmap.Metadata?.AudioFile;
     }
 }
diff --git a/osu.Game/Rulesets/Edit/Checks/CheckBackgroundPresence.cs b/osu.Game/Rulesets/Edit/Checks/CheckBackgroundPresence.cs
index 067800b409..4ca93a9807 100644
--- a/osu.Game/Rulesets/Edit/Checks/CheckBackgroundPresence.cs
+++ b/osu.Game/Rulesets/Edit/Checks/CheckBackgroundPresence.cs
@@ -10,6 +10,6 @@ namespace osu.Game.Rulesets.Edit.Checks
     {
         protected override CheckCategory Category => CheckCategory.Resources;
         protected override string TypeOfFile => "background";
-        protected override string GetFilename(IBeatmap beatmap) => beatmap.Metadata?.BackgroundFile;
+        protected override string? GetFilename(IBeatmap beatmap) => beatmap.Metadata?.BackgroundFile;
     }
 }
diff --git a/osu.Game/Rulesets/Edit/Checks/CheckFilePresence.cs b/osu.Game/Rulesets/Edit/Checks/CheckFilePresence.cs
index 6b256d025a..9a921ba808 100644
--- a/osu.Game/Rulesets/Edit/Checks/CheckFilePresence.cs
+++ b/osu.Game/Rulesets/Edit/Checks/CheckFilePresence.cs
@@ -11,7 +11,7 @@ namespace osu.Game.Rulesets.Edit.Checks
     {
         protected abstract CheckCategory Category { get; }
         protected abstract string TypeOfFile { get; }
-        protected abstract string GetFilename(IBeatmap beatmap);
+        protected abstract string? GetFilename(IBeatmap beatmap);
 
         public CheckMetadata Metadata => new CheckMetadata(Category, $"Missing {TypeOfFile}");
 
@@ -23,7 +23,7 @@ namespace osu.Game.Rulesets.Edit.Checks
 
         public IEnumerable<Issue> Run(BeatmapVerifierContext context)
         {
-            string filename = GetFilename(context.Beatmap);
+            string? filename = GetFilename(context.Beatmap);
 
             if (string.IsNullOrEmpty(filename))
             {