Fix library resolving

NativeFileDialogSharp/Native/LibResolver.cs

@@ -0,0 +1,98 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Reflection;
+using System.Runtime.InteropServices;
+using System;
+
+namespace NativeFileDialogSharp.Native;
+
+internal unsafe static class LibResolver
+{
+    public const string LibName = NativeFunctions.LibraryName;
+
+    internal static nint? CachedPtr;
+
+    static LibResolver()
+    {
+        NativeLibrary.SetDllImportResolver(Assembly.GetExecutingAssembly(), OnDllImport);
+    }
+
+    public static void EnsureInit() { }
+
+    private static nint OnDllImport(string libraryName, Assembly assembly, DllImportSearchPath? searchPath)
+    {
+        if (libraryName == NativeFunctions.LibraryName)
+        {
+            if (CachedPtr is nint cached) return cached;
+            if (TryFindLib(libraryName, assembly, searchPath, out var lib))
+            {
+                CachedPtr = lib;
+                return lib;
+            }
+        }
+
+        return NativeLibrary.Load(libraryName, assembly, searchPath);
+    }
+
+    private static bool TryFindLib(string name, Assembly assembly, DllImportSearchPath? searchPath, out nint lib)
+    {
+        string rid = RuntimeInformation.RuntimeIdentifier;
+        string nugetNativeLibsPath = Path.Combine(AppContext.BaseDirectory, "runtimes", rid, "native");
+        bool isNuGetRuntimeLibrariesDirectoryPresent = Directory.Exists(nugetNativeLibsPath);
+        string dllName = name;
+        string altDllName = null;
+
+        if (OperatingSystem.IsWindows())
+        {
+            dllName = $"{name}.dll";
+
+            if (!isNuGetRuntimeLibrariesDirectoryPresent)
+            {
+                rid = RuntimeInformation.ProcessArchitecture switch
+                {
+                    Architecture.X64 => "win-x64",
+                    Architecture.X86 => "win-x86",
+                    _ => throw new NotSupportedException()
+                };
+
+                nugetNativeLibsPath = Path.Combine(AppContext.BaseDirectory, "runtimes", rid, "native");
+                isNuGetRuntimeLibrariesDirectoryPresent = Directory.Exists(nugetNativeLibsPath);
+            }
+        }
+        else if (OperatingSystem.IsLinux())
+        {
+            dllName = $"{name}.so";
+            altDllName = $"lib{name}.so";
+        }
+
+        if (isNuGetRuntimeLibrariesDirectoryPresent)
+        {
+            string nativeLibPath = Path.Combine(AppContext.BaseDirectory, "runtimes", rid, "native", dllName);
+
+            if (NativeLibrary.TryLoad(nativeLibPath, out lib))
+            {
+                return true;
+            }
+
+            if (altDllName != null)
+            {
+                nativeLibPath = Path.Combine(AppContext.BaseDirectory, "runtimes", rid, "native", altDllName);
+
+                if (NativeLibrary.TryLoad(nativeLibPath, out lib))
+                {
+                    return true;
+                }
+            }
+        }
+        else
+        {
+            if (NativeLibrary.TryLoad(dllName, assembly, searchPath, out lib))
+            {
+                return true;
+            }
+        }
+
+        lib = IntPtr.Zero;
+        return false;
+    }
+}

NativeFileDialogSharp/Native/NativeFunctions.cs

@@ -21,6 +21,8 @@ namespace NativeFileDialogSharp.Native
     {
         public const string LibraryName = "nfd";
 
+        static NativeFunctions() { LibResolver.EnsureInit(); }
+
         [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
         public static extern unsafe nfdresult_t NFD_OpenDialog(byte* filterList, byte* defaultPath, out IntPtr outPath);
 

NativeFileDialogSharp/NativeFileDialogSharp.csproj

@@ -1,7 +1,6 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <LangVersion>7.3</LangVersion>
         <PackageVersion>0.5.0</PackageVersion>
         <Nullable>disable</Nullable>
         <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
@@ -10,17 +9,13 @@
         <PackageProjectUrl>https://github.com/milleniumbug/NativeFileDialogSharp</PackageProjectUrl>
         <RepositoryUrl>https://github.com/milleniumbug/NativeFileDialogSharp</RepositoryUrl>
         <Description>Cross-platform native file dialog controls for Windows, Linux and macOS</Description>
-        <TargetFramework>netstandard2.0</TargetFramework>
+        <TargetFramework>net8</TargetFramework>
     </PropertyGroup>
 
-    <ItemGroup>
+	<ItemGroup>
-        <Content Include="runtimes\**" PackagePath="runtimes" Visible="false" />
+		<Content Include="runtimes\**">
-        <Content Include="nfd.dll">
+			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-            <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
+		</Content>
-        </Content>
+	</ItemGroup>
-        <Content Include="nfd_x86.dll">
-            <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
-        </Content>
-    </ItemGroup>
 
 </Project>