Use ArgumentNullException.ThrowIfNull helper method

Did a simple search/replace on the whole repo (except the RSSDP project)
This reduces LOC and should improve performance (methods containing a throw statement don't get inlined)

```
if \((\w+) == null\)
\s+\{
\s+throw new ArgumentNullException\((.*)\);
\s+\}
```

```
ArgumentNullException.ThrowIfNull($1);
```

10 files changed, 21 insertions, 81 deletions

diff --git a/Emby.Server.Implementations/Sorting/AiredEpisodeOrderComparer.cs b/Emby.Server.Implementations/Sorting/AiredEpisodeOrderComparer.cs
index db8b68949..2d21bd9c2 100644
--- a/Emby.Server.Implementations/Sorting/AiredEpisodeOrderComparer.cs
+++ b/Emby.Server.Implementations/Sorting/AiredEpisodeOrderComparer.cs
@@ -24,15 +24,9 @@ namespace Emby.Server.Implementations.Sorting
         /// <returns>System.Int32.</returns>
         public int Compare(BaseItem? x, BaseItem? y)
         {
-            if (x == null)
-            {
-                throw new ArgumentNullException(nameof(x));
-            }
+            ArgumentNullException.ThrowIfNull(x);
 
-            if (y == null)
-            {
-                throw new ArgumentNullException(nameof(y));
-            }
+            ArgumentNullException.ThrowIfNull(y);
 
             var episode1 = x as Episode;
             var episode2 = y as Episode;
diff --git a/Emby.Server.Implementations/Sorting/CommunityRatingComparer.cs b/Emby.Server.Implementations/Sorting/CommunityRatingComparer.cs
index 5f142fa4b..5cb11ab46 100644
--- a/Emby.Server.Implementations/Sorting/CommunityRatingComparer.cs
+++ b/Emby.Server.Implementations/Sorting/CommunityRatingComparer.cs
@@ -23,15 +23,9 @@ namespace Emby.Server.Implementations.Sorting
         /// <returns>System.Int32.</returns>
         public int Compare(BaseItem? x, BaseItem? y)
         {
-            if (x == null)
-            {
-                throw new ArgumentNullException(nameof(x));
-            }
+            ArgumentNullException.ThrowIfNull(x);
 
-            if (y == null)
-            {
-                throw new ArgumentNullException(nameof(y));
-            }
+            ArgumentNullException.ThrowIfNull(y);
 
             return (x.CommunityRating ?? 0).CompareTo(y.CommunityRating ?? 0);
         }
diff --git a/Emby.Server.Implementations/Sorting/DateCreatedComparer.cs b/Emby.Server.Implementations/Sorting/DateCreatedComparer.cs
index 8b460166c..6133aaccc 100644
--- a/Emby.Server.Implementations/Sorting/DateCreatedComparer.cs
+++ b/Emby.Server.Implementations/Sorting/DateCreatedComparer.cs
@@ -24,15 +24,9 @@ namespace Emby.Server.Implementations.Sorting
         /// <returns>System.Int32.</returns>
         public int Compare(BaseItem? x, BaseItem? y)
         {
-            if (x == null)
-            {
-                throw new ArgumentNullException(nameof(x));
-            }
+            ArgumentNullException.ThrowIfNull(x);
 
-            if (y == null)
-            {
-                throw new ArgumentNullException(nameof(y));
-            }
+            ArgumentNullException.ThrowIfNull(y);
 
             return DateTime.Compare(x.DateCreated, y.DateCreated);
         }
diff --git a/Emby.Server.Implementations/Sorting/IndexNumberComparer.cs b/Emby.Server.Implementations/Sorting/IndexNumberComparer.cs
index c5b00afb1..1bcaccd8a 100644
--- a/Emby.Server.Implementations/Sorting/IndexNumberComparer.cs
+++ b/Emby.Server.Implementations/Sorting/IndexNumberComparer.cs
@@ -24,15 +24,9 @@ namespace Emby.Server.Implementations.Sorting
         /// <returns>System.Int32.</returns>
         public int Compare(BaseItem? x, BaseItem? y)
         {
-            if (x == null)
-            {
-                throw new ArgumentNullException(nameof(x));
-            }
+            ArgumentNullException.ThrowIfNull(x);
 
-            if (y == null)
-            {
-                throw new ArgumentNullException(nameof(y));
-            }
+            ArgumentNullException.ThrowIfNull(y);
 
             if (!x.IndexNumber.HasValue && !y.IndexNumber.HasValue)
             {
diff --git a/Emby.Server.Implementations/Sorting/NameComparer.cs b/Emby.Server.Implementations/Sorting/NameComparer.cs
index c2875eeb9..93bec4db9 100644
--- a/Emby.Server.Implementations/Sorting/NameComparer.cs
+++ b/Emby.Server.Implementations/Sorting/NameComparer.cs
@@ -24,15 +24,9 @@ namespace Emby.Server.Implementations.Sorting
         /// <returns>System.Int32.</returns>
         public int Compare(BaseItem? x, BaseItem? y)
         {
-            if (x == null)
-            {
-                throw new ArgumentNullException(nameof(x));
-            }
+            ArgumentNullException.ThrowIfNull(x);
 
-            if (y == null)
-            {
-                throw new ArgumentNullException(nameof(y));
-            }
+            ArgumentNullException.ThrowIfNull(y);
 
             return string.Compare(x.Name, y.Name, StringComparison.OrdinalIgnoreCase);
         }
diff --git a/Emby.Server.Implementations/Sorting/OfficialRatingComparer.cs b/Emby.Server.Implementations/Sorting/OfficialRatingComparer.cs
index a81f78ebf..ce44f99a6 100644
--- a/Emby.Server.Implementations/Sorting/OfficialRatingComparer.cs
+++ b/Emby.Server.Implementations/Sorting/OfficialRatingComparer.cs
@@ -31,15 +31,9 @@ namespace Emby.Server.Implementations.Sorting
         /// <returns>System.Int32.</returns>
         public int Compare(BaseItem? x, BaseItem? y)
         {
-            if (x == null)
-            {
-                throw new ArgumentNullException(nameof(x));
-            }
-
-            if (y == null)
-            {
-                throw new ArgumentNullException(nameof(y));
-            }
+            ArgumentNullException.ThrowIfNull(x);
+
+            ArgumentNullException.ThrowIfNull(y);
 
             var levelX = string.IsNullOrEmpty(x.OfficialRating) ? 0 : _localization.GetRatingLevel(x.OfficialRating) ?? 0;
             var levelY = string.IsNullOrEmpty(y.OfficialRating) ? 0 : _localization.GetRatingLevel(y.OfficialRating) ?? 0;
diff --git a/Emby.Server.Implementations/Sorting/ParentIndexNumberComparer.cs b/Emby.Server.Implementations/Sorting/ParentIndexNumberComparer.cs
index 8c408bb4d..c54750843 100644
--- a/Emby.Server.Implementations/Sorting/ParentIndexNumberComparer.cs
+++ b/Emby.Server.Implementations/Sorting/ParentIndexNumberComparer.cs
@@ -24,15 +24,9 @@ namespace Emby.Server.Implementations.Sorting
         /// <returns>System.Int32.</returns>
         public int Compare(BaseItem? x, BaseItem? y)
         {
-            if (x == null)
-            {
-                throw new ArgumentNullException(nameof(x));
-            }
+            ArgumentNullException.ThrowIfNull(x);
 
-            if (y == null)
-            {
-                throw new ArgumentNullException(nameof(y));
-            }
+            ArgumentNullException.ThrowIfNull(y);
 
             if (!x.ParentIndexNumber.HasValue && !y.ParentIndexNumber.HasValue)
             {
diff --git a/Emby.Server.Implementations/Sorting/RuntimeComparer.cs b/Emby.Server.Implementations/Sorting/RuntimeComparer.cs
index e32e5552e..646bafbb5 100644
--- a/Emby.Server.Implementations/Sorting/RuntimeComparer.cs
+++ b/Emby.Server.Implementations/Sorting/RuntimeComparer.cs
@@ -26,15 +26,9 @@ namespace Emby.Server.Implementations.Sorting
         /// <returns>System.Int32.</returns>
         public int Compare(BaseItem x, BaseItem y)
         {
-            if (x == null)
-            {
-                throw new ArgumentNullException(nameof(x));
-            }
+            ArgumentNullException.ThrowIfNull(x);
 
-            if (y == null)
-            {
-                throw new ArgumentNullException(nameof(y));
-            }
+            ArgumentNullException.ThrowIfNull(y);
 
             return (x.RunTimeTicks ?? 0).CompareTo(y.RunTimeTicks ?? 0);
         }
diff --git a/Emby.Server.Implementations/Sorting/SortNameComparer.cs b/Emby.Server.Implementations/Sorting/SortNameComparer.cs
index 79be9a89a..628b9b3dd 100644
--- a/Emby.Server.Implementations/Sorting/SortNameComparer.cs
+++ b/Emby.Server.Implementations/Sorting/SortNameComparer.cs
@@ -26,15 +26,9 @@ namespace Emby.Server.Implementations.Sorting
         /// <returns>System.Int32.</returns>
         public int Compare(BaseItem x, BaseItem y)
         {
-            if (x == null)
-            {
-                throw new ArgumentNullException(nameof(x));
-            }
+            ArgumentNullException.ThrowIfNull(x);
 
-            if (y == null)
-            {
-                throw new ArgumentNullException(nameof(y));
-            }
+            ArgumentNullException.ThrowIfNull(y);
 
             return string.Compare(x.SortName, y.SortName, StringComparison.OrdinalIgnoreCase);
         }
diff --git a/Emby.Server.Implementations/Sorting/StudioComparer.cs b/Emby.Server.Implementations/Sorting/StudioComparer.cs
index c917daaad..457c06271 100644
--- a/Emby.Server.Implementations/Sorting/StudioComparer.cs
+++ b/Emby.Server.Implementations/Sorting/StudioComparer.cs
@@ -26,15 +26,9 @@ namespace Emby.Server.Implementations.Sorting
         /// <returns>System.Int32.</returns>
         public int Compare(BaseItem x, BaseItem y)
         {
-            if (x == null)
-            {
-                throw new ArgumentNullException(nameof(x));
-            }
+            ArgumentNullException.ThrowIfNull(x);
 
-            if (y == null)
-            {
-                throw new ArgumentNullException(nameof(y));
-            }
+            ArgumentNullException.ThrowIfNull(y);
 
             return AlphanumericComparator.CompareValues(x.Studios.FirstOrDefault(), y.Studios.FirstOrDefault());
         }