我喜欢ILSpy工具。它不仅显示了架构，还显示了目标框架:

// linq2db, Version=3.0.0.0, Culture=neutral, PublicKeyToken=e41013125f9e410a
// Global type: <Module>
// Architecture: AnyCPU (64-bit preferred)
// Runtime: v4.0.30319
// This assembly is signed with a strong name key.
// This assembly was compiled using the /deterministic option.
// Hash algorithm: SHA1

因此，可以确定它是。net Core 2.1， .NET Framework 4.6或任何其他版本:

您可以使用CorFlags命令行工具(例如，C:\Program Files\Microsoft sdk \Windows\v7.0\Bin\CorFlags.exe)来确定程序集的状态，根据其输出并将程序集作为二进制资产打开，您应该能够确定您需要在哪里查找，以确定32位标志是否设置为1 (x86)或0(任何CPU或x64，取决于PE):

Option    | PE    | 32BIT
----------|-------|---------
x86       | PE32  | 1
Any CPU   | PE32  | 0
x64       | PE32+ | 0

博客文章x64 Development with . net有一些关于corflags的信息。

更好的是，您可以使用Module。GetPEKind来确定程序集是否为portableexecutabletypes值PE32Plus(64位)、Required32Bit(32位和WoW)或ILOnly(任何CPU)以及其他属性。

[TestMethod]
public void EnsureKWLLibrariesAreAll64Bit()
{
    var assemblies = Assembly.GetExecutingAssembly().GetReferencedAssemblies().Where(x => x.FullName.StartsWith("YourCommonProjectName")).ToArray();
    foreach (var assembly in assemblies)
    {
        var myAssemblyName = AssemblyName.GetAssemblyName(assembly.FullName.Split(',')[0] + ".dll");
        Assert.AreEqual(ProcessorArchitecture.MSIL, myAssemblyName.ProcessorArchitecture);
    }
}

一个更通用的方法-使用文件结构来确定位和图像类型:

public static CompilationMode GetCompilationMode(this FileInfo info)
{
    if (!info.Exists)
        throw new ArgumentException($"{info.FullName} does not exist");

    var intPtr = IntPtr.Zero;
    try
    {
        uint unmanagedBufferSize = 4096;
        intPtr = Marshal.AllocHGlobal((int)unmanagedBufferSize);

        using (var stream = File.Open(info.FullName, FileMode.Open, FileAccess.Read))
        {
            var bytes = new byte[unmanagedBufferSize];
            stream.Read(bytes, 0, bytes.Length);
            Marshal.Copy(bytes, 0, intPtr, bytes.Length);
        }

        // Check DOS header magic number
        if (Marshal.ReadInt16(intPtr) != 0x5a4d)
            return CompilationMode.Invalid;

        // This will get the address for the WinNT header
        var ntHeaderAddressOffset = Marshal.ReadInt32(intPtr + 60);

        // Check WinNT header signature
        var signature = Marshal.ReadInt32(intPtr + ntHeaderAddressOffset);
        if (signature != 0x4550)
            return CompilationMode.Invalid;

        // Determine file bitness by reading magic from IMAGE_OPTIONAL_HEADER
        var magic = Marshal.ReadInt16(intPtr + ntHeaderAddressOffset + 24);

        var result = CompilationMode.Invalid;
        uint clrHeaderSize;
        if (magic == 0x10b)
        {
            clrHeaderSize = (uint)Marshal.ReadInt32(intPtr + ntHeaderAddressOffset + 24 + 208 + 4);
            result |= CompilationMode.Bit32;
        }
        else if (magic == 0x20b)
        {
            clrHeaderSize = (uint)Marshal.ReadInt32(intPtr + ntHeaderAddressOffset + 24 + 224 + 4);
            result |= CompilationMode.Bit64;
        }
        else return CompilationMode.Invalid;

        result |= clrHeaderSize != 0
            ? CompilationMode.CLR
            : CompilationMode.Native;

        return result;
    }
    finally
    {
        if (intPtr != IntPtr.Zero)
            Marshal.FreeHGlobal(intPtr);
    }
}

编译模式枚举

[Flags]
public enum CompilationMode
{
    Invalid = 0,
    Native = 0x1,
    CLR = Native << 1,
    Bit32 = CLR << 1,
    Bit64 = Bit32 << 1
}

源代码和解释在GitHub。

前面提到的一个替代工具是Telerik JustDecompile(免费工具)，它将在程序集名称旁边显示信息:

还有一种方法是在DLL上使用Visual Studio工具中的dumpbin，并寻找适当的输出:

dumpbin.exe /HEADERS <your DLL file path>
    FILE HEADER VALUE
                 14C machine (x86)
                   4 number of sections
            5885AC36 time date stamp Mon Jan 23 12:39:42 2017
                   0 file pointer to symbol table
                   0 number of symbols
                  E0 size of optional header
                2102 characteristics
                       Executable
                       32 bit word machine
                       DLL

注意:上面的输出是一个32位DLL文件

dumpbin.exe的一个更有用的选项是/EXPORTS。它将显示DLL文件公开的函数

dumpbin.exe /EXPORTS <PATH OF THE DLL FILE>