diff --git a/PInvoke/Cryptography/NCrypt/NCrypt.cs b/PInvoke/Cryptography/NCrypt/NCrypt.cs
index f795e88a..07e49bb7 100644
--- a/PInvoke/Cryptography/NCrypt/NCrypt.cs
+++ b/PInvoke/Cryptography/NCrypt/NCrypt.cs
@@ -5084,7 +5084,9 @@ public static partial class NCrypt
 		/// </summary>
 		public NCryptBuffer[] pBuffers
 		{
+#pragma warning disable CA2021 // Do not call Enumerable.Cast<T> or Enumerable.OfType<T> with incompatible types
 			get => _pBuffers.ToIEnum<_NCryptBuffer>((int)cBuffers).Cast<NCryptBuffer>().ToArray();
+#pragma warning restore CA2021 // Do not call Enumerable.Cast<T> or Enumerable.OfType<T> with incompatible types
 			set
 			{
 				((IDisposable)this).Dispose();
diff --git a/PInvoke/Gdi32/WinGdi.DevCtxt.cs b/PInvoke/Gdi32/WinGdi.DevCtxt.cs
index c92c4954..94acb5bb 100644
--- a/PInvoke/Gdi32/WinGdi.DevCtxt.cs
+++ b/PInvoke/Gdi32/WinGdi.DevCtxt.cs
@@ -659,7 +659,9 @@ public static partial class Gdi32
 			throw new ArgumentException($"The supplied type cannot be enumerated by this function.");
 		var l = new List<IntPtr>();
 		EnumObjects(hdc, ev, EnumProc);
+#pragma warning disable CA2021 // Do not call Enumerable.Cast<T> or Enumerable.OfType<T> with incompatible types
 		return l.Cast<T>();
+#pragma warning restore CA2021 // Do not call Enumerable.Cast<T> or Enumerable.OfType<T> with incompatible types
 
 		int EnumProc(IntPtr Arg1, IntPtr Arg2)
 		{
diff --git a/Windows.Shell/ShellDataObject.cs b/Windows.Shell/ShellDataObject.cs
index b06ac126..4561c195 100644
--- a/Windows.Shell/ShellDataObject.cs
+++ b/Windows.Shell/ShellDataObject.cs
@@ -35,7 +35,7 @@ public class ShellDataObject : DataObject
 
 	/// <summary>Initializes a new instance of the <see cref="ShellDataObject"/> class.</summary>
 	/// <param name="items">A list of ShellItem instances.</param>
-	public ShellDataObject(IEnumerable<ShellItem> items) : base((items as ShellItemArray ?? new ShellItemArray(items)).ToDataObject())
+	public ShellDataObject(IEnumerable<ShellItem> items) : base((items as ShellItemArray ?? new ShellItemArray(items)).ToDataObject()!)
 	{
 	}
 
@@ -58,7 +58,7 @@ public class ShellDataObject : DataObject
 	/// </summary>
 	public System.Globalization.CultureInfo Culture
 	{
-		get => base.GetDataPresent(DataFormats.Locale) ? new((int)base.GetData(DataFormats.Locale, false)) : System.Globalization.CultureInfo.CurrentCulture;
+		get => base.GetDataPresent(DataFormats.Locale) ? new((int)base.GetData(DataFormats.Locale, false)!) : System.Globalization.CultureInfo.CurrentCulture;
 		set => base.SetData(DataFormats.Locale, false, value.LCID);
 	}
 
@@ -74,7 +74,7 @@ public class ShellDataObject : DataObject
 	/// <value><see langword="true"/> if the data object is within a drag-and-drop loop; otherwise, <see langword="false"/>.</value>
 	public bool InDragLoop
 	{
-		get => base.GetDataPresent(ShellClipboardFormat.CFSTR_INDRAGLOOP) && (int)base.GetData(ShellClipboardFormat.CFSTR_INDRAGLOOP, false) != 0;
+		get => base.GetDataPresent(ShellClipboardFormat.CFSTR_INDRAGLOOP) && (int)base.GetData(ShellClipboardFormat.CFSTR_INDRAGLOOP, false)! != 0;
 		set => base.SetData(ShellClipboardFormat.CFSTR_INDRAGLOOP, false, value ? 1 : 0);
 	}
 
@@ -109,7 +109,7 @@ public class ShellDataObject : DataObject
 	/// <value>Specifies whether its preferred method of data transfer is move or copy.</value>
 	public DragDropEffects PreferredDropEffect
 	{
-		get => base.GetDataPresent(ShellClipboardFormat.CFSTR_PREFERREDDROPEFFECT) ? (DragDropEffects)(int)base.GetData(ShellClipboardFormat.CFSTR_PREFERREDDROPEFFECT, false) : 0;
+		get => base.GetDataPresent(ShellClipboardFormat.CFSTR_PREFERREDDROPEFFECT) ? (DragDropEffects)(int)base.GetData(ShellClipboardFormat.CFSTR_PREFERREDDROPEFFECT, false)! : 0;
 		set => base.SetData(ShellClipboardFormat.CFSTR_PREFERREDDROPEFFECT, false, (int)value);
 	}
 
@@ -124,7 +124,7 @@ public class ShellDataObject : DataObject
 	/// <value>The CLSID.</value>
 	public Guid TargetClsid
 	{
-		get => base.GetDataPresent(ShellClipboardFormat.CFSTR_TARGETCLSID) ? (Guid)base.GetData(ShellClipboardFormat.CFSTR_TARGETCLSID, false) : default;
+		get => base.GetDataPresent(ShellClipboardFormat.CFSTR_TARGETCLSID) ? (Guid)base.GetData(ShellClipboardFormat.CFSTR_TARGETCLSID, false)! : default;
 		set => base.SetData(ShellClipboardFormat.CFSTR_TARGETCLSID, false, value);
 	}
 
@@ -187,7 +187,7 @@ public class ShellDataObject : DataObject
 			case ShellClipboardFormat.CFSTR_SHELLIDLIST:
 				return GetShellIdList() ?? new ShellItemArray();
 		}
-		return base.GetData(format, autoConvert);
+		return base.GetData(format, autoConvert)!;
 	}
 
 	/// <summary>Retrieves the data associated with the specified data format at the specified index.</summary>
@@ -272,7 +272,7 @@ public class ShellDataObject : DataObject
 	/// <param name="data">The data.</param>
 	/// <returns></returns>
 	/// <exception cref="ArgumentException">Data value must be of type DROPDESCRIPTION., nameof(data)</exception>
-	public override void SetData(string format, object data)
+	public override void SetData(string format, object? data)
 	{
 		if (format == ShellClipboardFormat.CFSTR_DROPDESCRIPTION)
 		{
diff --git a/Windows.Shell/ShellObjects/ShellBrowser.cs b/Windows.Shell/ShellObjects/ShellBrowser.cs
index 4524fcfa..9af1e5f5 100644
--- a/Windows.Shell/ShellObjects/ShellBrowser.cs
+++ b/Windows.Shell/ShellObjects/ShellBrowser.cs
@@ -242,7 +242,7 @@ public class ShellBrowser : UserControl, IWin32Window, IShellBrowser, Shell32.IS
 	/// </summary>
 	[Bindable(false), Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
 	[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
-	public override Image BackgroundImage => base.BackgroundImage;
+	public override Image BackgroundImage => base.BackgroundImage!;
 
 	/// <inheritdoc/>
 	protected override Size DefaultSize => new(200, 150);
@@ -614,7 +614,7 @@ public class ShellBrowser : UserControl, IWin32Window, IShellBrowser, Shell32.IS
 		{
 			var forward = (keyData & Keys.Shift) != Keys.Shift;
 
-			Parent.SelectNextControl(ActiveControl, forward: forward, tabStopOnly: true, nested: true, wrap: true);
+			Parent!.SelectNextControl(ActiveControl, forward: forward, tabStopOnly: true, nested: true, wrap: true);
 
 			return true;
 		}
diff --git a/Windows.Shell/TaskBar/ImageIndexer.cs b/Windows.Shell/TaskBar/ImageIndexer.cs
index db54dace..2b81b516 100644
--- a/Windows.Shell/TaskBar/ImageIndexer.cs
+++ b/Windows.Shell/TaskBar/ImageIndexer.cs
@@ -10,7 +10,7 @@ public partial class ThumbnailToolbarButton
 		private string key = string.Empty;
 		private bool useIntegerIndex = true;
 
-		public virtual int ActualIndex => useIntegerIndex ? Index : (ImageList is null ? -1 : ImageList.Images.IndexOfKey(Key));
+		public virtual int ActualIndex => useIntegerIndex ? Index : (ImageList is null ? -1 : ImageList.Images.IndexOfKey(Key ?? ""));
 
 		public virtual ImageList? ImageList { get; set; }