[英]Is it possible to Load an assembly from the GAC without the FullName?
我知道如何从文件名和 GAC 加载程序集。 由于 My.msi 文件会将 dll 项目放入 GAC,我想知道是否可以在不知道 FullName 的情况下从 GAC 加载它(我的意思是仅使用程序集名称,甚至是 dll 文件名),因为我必须从另一个项目加载此程序集。
这是一段允许执行此操作的代码,以及一个示例:
string path = GetAssemblyPath("System.DirectoryServices");
Assembly.LoadFrom(path);
注意如果你需要一个特定的处理器架构,因为它支持部分名称,你可以写这样的东西:
// load from the 32-bit GAC
string path = GetAssemblyPath("Microsoft.Transactions.Bridge.Dtc, ProcessorArchitecture=X86");
// load from the 64-bit GAC
string path = GetAssemblyPath("Microsoft.Transactions.Bridge.Dtc, ProcessorArchitecture=AMD64");
这是实现:
/// <summary>
/// Gets an assembly path from the GAC given a partial name.
/// </summary>
/// <param name="name">An assembly partial name. May not be null.</param>
/// <returns>
/// The assembly path if found; otherwise null;
/// </returns>
public static string GetAssemblyPath(string name)
{
if (name == null)
throw new ArgumentNullException("name");
string finalName = name;
AssemblyInfo aInfo = new AssemblyInfo();
aInfo.cchBuf = 1024; // should be fine...
aInfo.currentAssemblyPath = new String('\0', aInfo.cchBuf);
IAssemblyCache ac;
int hr = CreateAssemblyCache(out ac, 0);
if (hr >= 0)
{
hr = ac.QueryAssemblyInfo(0, finalName, ref aInfo);
if (hr < 0)
return null;
}
return aInfo.currentAssemblyPath;
}
[ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown), Guid("e707dcde-d1cd-11d2-bab9-00c04f8eceae")]
private interface IAssemblyCache
{
void Reserved0();
[PreserveSig]
int QueryAssemblyInfo(int flags, [MarshalAs(UnmanagedType.LPWStr)] string assemblyName, ref AssemblyInfo assemblyInfo);
}
[StructLayout(LayoutKind.Sequential)]
private struct AssemblyInfo
{
public int cbAssemblyInfo;
public int assemblyFlags;
public long assemblySizeInKB;
[MarshalAs(UnmanagedType.LPWStr)]
public string currentAssemblyPath;
public int cchBuf; // size of path buf.
}
[DllImport("fusion.dll")]
private static extern int CreateAssemblyCache(out IAssemblyCache ppAsmCache, int reserved);
是的,这就是GAC 的重点。 运行时将首先查看 GAC,然后再查看当前目录。
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