Question

大型程序的一个小功能检查文件夹中的程序集，并用最新版本替换过时的程序集。要实现这一点，它需要读取现有程序集文件的版本号，而不是将这些程序集实际加载到执行过程中。

Answer 1

using System.Reflection;
using System.IO;

...

// Get current and updated assemblies
AssemblyName currentAssemblyName = AssemblyName.GetAssemblyName(currentAssemblyPath);
AssemblyName updatedAssemblyName = AssemblyName.GetAssemblyName(updatedAssemblyPath);

// Compare both versions
if (updatedAssemblyName.Version.CompareTo(currentAssemblyName.Version) <= 0)
{
    // There's nothing to update
    return;
}

// Update older version
File.Copy(updatedAssemblyPath, currentAssemblyPath, true);

Answer 2

根据文件的不同，一个选项可能是FileVersionInfo - 即

FileVersionInfo fvi = FileVersionInfo.GetVersionInfo(path)
string ver = fvi.FileVersion;

问题在于，这取决于具有[AssemblyFileVersion]属性的代码，并且它与[AssemblyVersion]属性匹配。

我想我会首先看一下其他人建议的AssemblyName选项。

Answer 3

使用AssemblyName.GetAssemblyName("assembly.dll");，然后解析名称。根据{{3}}：

这仅适用于文件包含程序集清单。这个方法导致文件打开并关闭，但装配不是添加到此域。

Answer 4

仅供记录：以下是如何在C＃.NET Compact Framework中获取文件版本。它基本上来自OpenNETCF，但相当短，并且可以通过copy'n'pasted来实现。希望它会有所帮助...

public static Version GetFileVersionCe(string fileName)
{
    int handle = 0;
    int length = GetFileVersionInfoSize(fileName, ref handle);
    Version v = null;
    if (length > 0)
    {
        IntPtr buffer = System.Runtime.InteropServices.Marshal.AllocHGlobal(length);
        if (GetFileVersionInfo(fileName, handle, length, buffer))
        {
            IntPtr fixedbuffer = IntPtr.Zero;
            int fixedlen = 0;
            if (VerQueryValue(buffer, "\\", ref fixedbuffer, ref fixedlen))
            {
                byte[] fixedversioninfo = new byte[fixedlen];
                System.Runtime.InteropServices.Marshal.Copy(fixedbuffer, fixedversioninfo, 0, fixedlen);
                v = new Version(
                    BitConverter.ToInt16(fixedversioninfo, 10), 
                    BitConverter.ToInt16(fixedversioninfo,  8), 
                    BitConverter.ToInt16(fixedversioninfo, 14),
                    BitConverter.ToInt16(fixedversioninfo, 12));
            }
        }
        Marshal.FreeHGlobal(buffer);
    }
    return v;
}

[DllImport("coredll", EntryPoint = "GetFileVersionInfo", SetLastError = true)]
private static extern bool GetFileVersionInfo(string filename, int handle, int len, IntPtr buffer);
[DllImport("coredll", EntryPoint = "GetFileVersionInfoSize", SetLastError = true)]
private static extern int GetFileVersionInfoSize(string filename, ref int handle);
[DllImport("coredll", EntryPoint = "VerQueryValue", SetLastError = true)]
private static extern bool VerQueryValue(IntPtr buffer, string subblock, ref IntPtr blockbuffer, ref int len);

Answer 5

乔尔回答的 .netcore 更新，使用 AssemblyLoadContext：

using System.IO;
using System.Reflection;
using System.Runtime.Loader;

...

// Get current and updated assemblies
AssemblyName currentAssemblyName = AssemblyLoadContext.GetAssemblyName(currentAssemblyPath);
AssemblyName updatedAssemblyName = AssemblyLoadContext.GetAssemblyName(updatedAssemblyPath);

// Compare both versions
if (updatedAssemblyName.Version.CompareTo(currentAssemblyName.Version) <= 0)
{
    // There's nothing to update
    return;
}

// Update older version
File.Copy(updatedAssemblyPath, currentAssemblyPath, true);

<块引用>

我发现这在分析由 Windows 服务运行（和锁定）的 DLL 时很有用，这是创建单独的 AppDomain 的更简洁的替代方法。

如何在不加载程序集的情况下获取程序集的版本？

5 个答案: