/// <summary>
/// Creates an assemby or com reference node given a selector data.
/// </summary>
protected virtual ReferenceNode CreateFileComponent(VSCOMPONENTSELECTORDATA selectorData)
{
if (null == selectorData.bstrFile)
{
throw new ArgumentNullException("selectorData");
}
// We have a path to a file, it could be anything
// First see if it is a managed assembly
bool tryToCreateAnAssemblyReference = true;
if (File.Exists(selectorData.bstrFile))
{
try {
// We should not load the assembly in the current appdomain.
// If we do not do it like that and we load the assembly in the current appdomain then the assembly cannot be unloaded again.
// The following problems might arose in that case.
// 1. Assume that a user is extending the MPF and his project is creating a managed assembly dll.
// 2. The user opens VS and creates a project and builds it.
// 3. Then the user opens VS creates another project and adds a reference to the previously built assembly. This will load the assembly in the appdomain had we been using Assembly.ReflectionOnlyLoadFrom.
// 4. Then he goes back to the first project modifies it an builds it. A build error is issued that the assembly is used.
// GetAssemblyName is assured not to load the assembly.
tryToCreateAnAssemblyReference = (AssemblyName.GetAssemblyName(selectorData.bstrFile) != null);
} catch (BadImageFormatException) {
// We have found the file and it is not a .NET assembly; no need to try to
// load it again.
tryToCreateAnAssemblyReference = false;
} catch (FileLoadException) {
// We must still try to load from here because this exception is thrown if we want
// to add the same assembly refererence from different locations.
tryToCreateAnAssemblyReference = true;
}
}
ReferenceNode node = null;
if (tryToCreateAnAssemblyReference)
{
// This might be a candidate for an assembly reference node. Try to load it.
// CreateAssemblyReferenceNode will suppress BadImageFormatException if the node cannot be created.
node = this.CreateAssemblyReferenceNode(selectorData.bstrFile);
}
// If no node has been created try to create a com reference node.
if (node == null)
{
if (!File.Exists(selectorData.bstrFile))
{
return(null);
}
node = ProjectMgr.CreateReferenceNodeForFile(selectorData.bstrFile);
}
return(node);
}