/// <summary>
/// Find the highest version of the assemblyName in the redist list for framework assemblies taking into account the simplename, culture and public key.
/// </summary>
/// <param name="assemblyName">The name of the assembly we would like to find the highest version for</param>
/// <returns>Key value pair, K: Assembly entry of highest value in the redist list. V: AssemblyNameExtension with the version information or null if the name could not be found</returns>
internal AssemblyEntry FindHighestVersionInRedistList(AssemblyNameExtension assemblyName)
{
// The assembly we are looking for is not listed in a redist list which contains framework assemblies. We do not want to find
// find non framework assembly entries.
if (!FrameworkAssemblyEntryInRedist(assemblyName))
{
return(null);
}
// Look up an assembly with the same base name in the installedAssemblyTables.
// This list should be sorted alphabetically by simple name and then greatest verion
foreach (AssemblyEntry tableCandidate in _redistList.FindAssemblyNameFromSimpleName(assemblyName.Name))
{
// Make an AssemblyNameExtension for comparing.
AssemblyNameExtension mostRecentAssemblyNameCandidate = tableCandidate.AssemblyNameExtension;
// Optimize performance for the whidbey case by doing an exact comparison first.
if (mostRecentAssemblyNameCandidate.EqualsIgnoreVersion(assemblyName))
{
return(tableCandidate);
}
}
return(null);
}
/// <summary>
/// Cached implementation of GetAssemblyName.
/// </summary>
/// <param name="path">The path to the file</param>
/// <returns>The assembly name.</returns>
private AssemblyNameExtension GetAssemblyName(string path)
{
// If the assembly is in an FX folder and its a well-known assembly
// then we can short-circuit the File IO involved with GetAssemblyName()
if (redistList != null)
{
string extension = Path.GetExtension(path);
if (string.Equals(extension, ".dll", StringComparison.OrdinalIgnoreCase))
{
IEnumerable <AssemblyEntry> assemblyNames = redistList.FindAssemblyNameFromSimpleName
(
Path.GetFileNameWithoutExtension(path)
);
string filename = Path.GetFileName(path);
foreach (AssemblyEntry a in assemblyNames)
{
string pathFromRedistList = Path.Combine(a.FrameworkDirectory, filename);
if (String.Equals(path, pathFromRedistList, StringComparison.OrdinalIgnoreCase))
{
return(new AssemblyNameExtension(a.FullName));
}
}
}
}
// Not a well-known FX assembly so now check the cache.
FileState fileState = GetFileState(path);
if (fileState.Assembly == null)
{
fileState.Assembly = getAssemblyName(path);
// Certain assemblies, like mscorlib may not have metadata.
// Avoid continuously calling getAssemblyName on these files by
// recording these as having an empty name.
if (fileState.Assembly == null)
{
fileState.Assembly = AssemblyNameExtension.UnnamedAssembly;
}
isDirty = true;
}
if (fileState.Assembly.IsUnnamedAssembly)
{
return(null);
}
return(fileState.Assembly);
}
