Code Quality: Introduced ComPtr.As() to QI easily (#16382)

Author: 0x5bfa

src/Files.App.CsWin32/Windows.Win32.ComHeapPtr.cs

@@ -16,7 +16,7 @@ public unsafe struct ComHeapPtr<T> : IDisposable where T : unmanaged
 		private T* _ptr;
 
 		public bool IsNull
-			=> _ptr == default;
+			=> _ptr == null;
 
 		public ComHeapPtr(T* ptr)
 		{

src/Files.App.CsWin32/Windows.Win32.ComPtr.cs

@@ -16,7 +16,7 @@ public unsafe struct ComPtr<T> : IDisposable where T : unmanaged
 		private T* _ptr;
 
 		public bool IsNull
-			=> _ptr == default;
+			=> _ptr == null;
 
 		public ComPtr(T* ptr)
 		{
@@ -38,6 +38,14 @@ public ComPtr(T* ptr)
 			return (T**)Unsafe.AsPointer(ref Unsafe.AsRef(in this));
 		}
 
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public readonly ComPtr<U> As<U>(Guid riid) where U : unmanaged
+		{
+			ComPtr<U> pNewPtr = default;
+			((IUnknown*)_ptr)->QueryInterface(&riid, (void**)pNewPtr.GetAddressOf());
+			return pNewPtr;
+		}
+
 		[MethodImpl(MethodImplOptions.AggressiveInlining)]
 		public void Dispose()
 		{