This question is very similar to the following questions but mine is a little more precise, plus neither had an accepted answer and none of the answers offered seemed complete or optimal:
Originally I thought the following was the best approach but it doesn't work unless you specify the full name of the assembly and it's kind of hacky beacause of the try/catch but it's simple and works for many cases:
public static class GacUtil
{
public static bool IsAssemblyInGAC(string assemblyFullName)
{
try
{
return Assembly.ReflectionOnlyLoad(assemblyFullName)
.GlobalAssemblyCache;
}
catch
{
return false;
}
}
public static bool IsAssemblyInGAC(Assembly assembly)
{
return assembly.GlobalAssemblyCache;
}
}
This is a better approach that works without a try/catch by using the Fusion API. It's a bunch more code but it works with partial assembly names:
public static class GacUtil
{
[DllImport("fusion.dll")]
private static extern IntPtr CreateAssemblyCache(
out IAssemblyCache ppAsmCache,
int reserved);
[ComImport]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
[Guid("e707dcde-d1cd-11d2-bab9-00c04f8eceae")]
private interface IAssemblyCache
{
int Dummy1();
[PreserveSig()]
IntPtr QueryAssemblyInfo(
int flags,
[MarshalAs(UnmanagedType.LPWStr)] string assemblyName,
ref AssemblyInfo assemblyInfo);
int Dummy2();
int Dummy3();
int Dummy4();
}
[StructLayout(LayoutKind.Sequential)]
private struct AssemblyInfo
{
public int cbAssemblyInfo;
public int assemblyFlags;
public long assemblySizeInKB;
[MarshalAs(UnmanagedType.LPWStr)]
public string currentAssemblyPath;
public int cchBuf;
}
public static bool IsAssemblyInGAC(string assemblyName)
{
var assembyInfo = new AssemblyInfo { cchBuf = 512 };
assembyInfo.currentAssemblyPath = new string('', assembyInfo.cchBuf);
IAssemblyCache assemblyCache;
var hr = CreateAssemblyCache(out assemblyCache, 0);
if (hr == IntPtr.Zero)
{
hr = assemblyCache.QueryAssemblyInfo(
1,
assemblyName,
ref assembyInfo);
if (hr != IntPtr.Zero)
{
return false;
}
return true;
}
Marshal.ThrowExceptionForHR(hr.ToInt32());
return false;
}
}
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