public static bool IsSupported <T>()
{
if (!typeof(T).IsInterface)
{
throw new ArgumentException("Invalid generic type passed.", nameof(T));
}
if (Type.GetTypeFromCLSID(typeof(T).GUID, false) == null)
{
return(false);
}
var progId = ComClassProgIdAttribute.GetClassProgId <T>();
if (!string.IsNullOrWhiteSpace(progId) &&
Type.GetTypeFromProgID(progId, false) == null)
{
return(false);
}
return(true);
}
public static T CreateInstance <T>()
{
if (!IsSupported <T>())
{
throw new NotSupportedException("This type is not supported in current environment.");
}
try
{
var progId = ComClassProgIdAttribute.GetClassProgId <T>();
if (!string.IsNullOrWhiteSpace(progId))
{
var typeByProgId = Type.GetTypeFromProgID(progId, false);
if (typeByProgId != null)
{
return((T)Activator.CreateInstance(typeByProgId));
}
}
var typeByClassId = Type.GetTypeFromCLSID(typeof(T).GUID, false);
if (typeByClassId != null)
{
return((T)Activator.CreateInstance(typeByClassId));
}
}
catch (COMException e)
{
throw new NotSupportedException(
"Can not create a new instance of this interface in current environment.", e);
}
throw new NotSupportedException("Can not create a new instance of this interface in current environment.");
}