是否有可能加载从GAC程序集而不全名？ [英] Is it possible to Load an assembly from the GAC without the FullName?

问题描述

我知道如何从一个文件名从GAC加载程序集，而还。
作为我的.msi文件将提出一个dll项目到GAC，我想知道是否有可能从GAC不知情的全名加载它（我指的只是程序集的名称，甚至是DLL文件名），因为我必须从另一个项目加载此程序集...

I know how to load an assembly from a filename, and also from the GAC. As My .msi file will put a dll project into the GAC, I'm wondering if it's possible to load it from the GAC unknowing the FullName (I mean just with the assembly name, or even the dll filename), because I have to Load this assembly from another project...

谢谢，

洛朗

推荐答案

下面是一段代码，允许这样做，以及为例：

Here is a piece of code that allows to do this, and an exemple:

    string path = GetAssemblyPath("System.DirectoryServices");
    Assembly.LoadFrom(path);

请注意，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：

Note if you need a specific processor architecture, since it supports partial name, you can write this kind of things:

    // 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");

这是执行：

    /// <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);

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