13 files changed, 33 insertions, 8 deletions
diff --git a/src/SMAPI/Framework/Content/AssetData.cs b/src/SMAPI/Framework/Content/AssetData.cs
index 05be8a3b..be4a7ce6 100644
--- a/src/SMAPI/Framework/Content/AssetData.cs
+++ b/src/SMAPI/Framework/Content/AssetData.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 
 namespace StardewModdingAPI.Framework.Content
diff --git a/src/SMAPI/Framework/Content/AssetDataForDictionary.cs b/src/SMAPI/Framework/Content/AssetDataForDictionary.cs
index 735b651c..06dbe259 100644
--- a/src/SMAPI/Framework/Content/AssetDataForDictionary.cs
+++ b/src/SMAPI/Framework/Content/AssetDataForDictionary.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 
diff --git a/src/SMAPI/Framework/Content/AssetDataForImage.cs b/src/SMAPI/Framework/Content/AssetDataForImage.cs
index b0f1b5c7..8e59cd27 100644
--- a/src/SMAPI/Framework/Content/AssetDataForImage.cs
+++ b/src/SMAPI/Framework/Content/AssetDataForImage.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
diff --git a/src/SMAPI/Framework/Content/AssetDataForMap.cs b/src/SMAPI/Framework/Content/AssetDataForMap.cs
index 26e4986e..0425e195 100644
--- a/src/SMAPI/Framework/Content/AssetDataForMap.cs
+++ b/src/SMAPI/Framework/Content/AssetDataForMap.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -96,8 +98,8 @@ namespace StardewModdingAPI.Framework.Content
                 for (int y = 0; y < sourceArea.Value.Height; y++)
                 {
                     // calculate tile positions
-                    Point sourcePos = new Point(sourceArea.Value.X + x, sourceArea.Value.Y + y);
-                    Point targetPos = new Point(targetArea.Value.X + x, targetArea.Value.Y + y);
+                    Point sourcePos = new(sourceArea.Value.X + x, sourceArea.Value.Y + y);
+                    Point targetPos = new(targetArea.Value.X + x, targetArea.Value.Y + y);
 
                     // replace tiles on target-only layers
                     if (replaceAll)
@@ -147,7 +149,7 @@ namespace StardewModdingAPI.Framework.Content
         {
             switch (sourceTile)
             {
-                case StaticTile _:
+                case StaticTile:
                     return new StaticTile(targetLayer, targetSheet, sourceTile.BlendMode, sourceTile.TileIndex);
 
                 case AnimatedTile animatedTile:
diff --git a/src/SMAPI/Framework/Content/AssetDataForObject.cs b/src/SMAPI/Framework/Content/AssetDataForObject.cs
index d91873ae..4a6df64b 100644
--- a/src/SMAPI/Framework/Content/AssetDataForObject.cs
+++ b/src/SMAPI/Framework/Content/AssetDataForObject.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using Microsoft.Xna.Framework.Graphics;
@@ -47,9 +49,9 @@ namespace StardewModdingAPI.Framework.Content
         /// <inheritdoc />
         public TData GetData<TData>()
         {
-            if (!(this.Data is TData))
+            if (this.Data is not TData data)
                 throw new InvalidCastException($"The content data of type {this.Data.GetType().FullName} can't be converted to the requested {typeof(TData).FullName}.");
-            return (TData)this.Data;
+            return data;
         }
     }
 }
diff --git a/src/SMAPI/Framework/Content/AssetEditOperation.cs b/src/SMAPI/Framework/Content/AssetEditOperation.cs
index 818209fa..1b7d0c93 100644
--- a/src/SMAPI/Framework/Content/AssetEditOperation.cs
+++ b/src/SMAPI/Framework/Content/AssetEditOperation.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Events;
 
diff --git a/src/SMAPI/Framework/Content/AssetInfo.cs b/src/SMAPI/Framework/Content/AssetInfo.cs
index f5da5d69..51dcc61f 100644
--- a/src/SMAPI/Framework/Content/AssetInfo.cs
+++ b/src/SMAPI/Framework/Content/AssetInfo.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using Microsoft.Xna.Framework.Graphics;
diff --git a/src/SMAPI/Framework/Content/AssetInterceptorChange.cs b/src/SMAPI/Framework/Content/AssetInterceptorChange.cs
index 981eed40..7f53db9b 100644
--- a/src/SMAPI/Framework/Content/AssetInterceptorChange.cs
+++ b/src/SMAPI/Framework/Content/AssetInterceptorChange.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Reflection;
 using StardewModdingAPI.Internal;
@@ -36,7 +38,7 @@ namespace StardewModdingAPI.Framework.Content
             this.Instance = instance ?? throw new ArgumentNullException(nameof(instance));
             this.WasAdded = wasAdded;
 
-            if (!(instance is IAssetEditor) && !(instance is IAssetLoader))
+            if (instance is not (IAssetEditor or IAssetLoader))
                 throw new InvalidCastException($"The provided {nameof(instance)} value must be an {nameof(IAssetEditor)} or {nameof(IAssetLoader)} instance.");
         }
 
diff --git a/src/SMAPI/Framework/Content/AssetLoadOperation.cs b/src/SMAPI/Framework/Content/AssetLoadOperation.cs
index b12958d6..73e60e24 100644
--- a/src/SMAPI/Framework/Content/AssetLoadOperation.cs
+++ b/src/SMAPI/Framework/Content/AssetLoadOperation.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Events;
 
diff --git a/src/SMAPI/Framework/Content/AssetName.cs b/src/SMAPI/Framework/Content/AssetName.cs
index a1d37b0b..4d583d82 100644
--- a/src/SMAPI/Framework/Content/AssetName.cs
+++ b/src/SMAPI/Framework/Content/AssetName.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Toolkit.Utilities;
 using StardewValley;
@@ -107,7 +109,7 @@ namespace StardewModdingAPI.Framework.Content
                 return this.BaseName.Equals(assetName?.BaseName, StringComparison.OrdinalIgnoreCase);
 
             if (assetName is AssetName impl)
-                return this.ComparableName == impl?.ComparableName;
+                return this.ComparableName == impl.ComparableName;
 
             return this.Name.Equals(assetName?.Name, StringComparison.OrdinalIgnoreCase);
         }
diff --git a/src/SMAPI/Framework/Content/AssetOperationGroup.cs b/src/SMAPI/Framework/Content/AssetOperationGroup.cs
index a2fcb722..e3c3f92c 100644
--- a/src/SMAPI/Framework/Content/AssetOperationGroup.cs
+++ b/src/SMAPI/Framework/Content/AssetOperationGroup.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework.Content
 {
     /// <summary>A set of operations to apply to an asset for a given <see cref="IAssetEditor"/> or <see cref="IAssetLoader"/> implementation.</summary>
diff --git a/src/SMAPI/Framework/Content/ContentCache.cs b/src/SMAPI/Framework/Content/ContentCache.cs
index 8e0c6228..4e620d28 100644
--- a/src/SMAPI/Framework/Content/ContentCache.cs
+++ b/src/SMAPI/Framework/Content/ContentCache.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.Contracts;
diff --git a/src/SMAPI/Framework/Content/TilesheetReference.cs b/src/SMAPI/Framework/Content/TilesheetReference.cs
index 0919bb44..cdc4bc62 100644
--- a/src/SMAPI/Framework/Content/TilesheetReference.cs
+++ b/src/SMAPI/Framework/Content/TilesheetReference.cs
@@ -1,4 +1,5 @@
-using System.Numerics;
+#nullable disable
+
 using xTile.Dimensions;
 
 namespace StardewModdingAPI.Framework.Content