public override IPermission Intersect(IPermission target)
{
EnvironmentPermission ep = Cast(target);
if (ep == null)
{
return(null);
}
if (IsUnrestricted())
{
return(ep.Copy());
}
if (ep.IsUnrestricted())
{
return(Copy());
}
int n = 0;
EnvironmentPermission result = new EnvironmentPermission(PermissionState.None);
string readTarget = ep.GetPathList(EnvironmentPermissionAccess.Read);
if (readTarget != null)
{
string[] targets = readTarget.Split(';');
foreach (string t in targets)
{
if (readList.Contains(t))
{
result.AddPathList(EnvironmentPermissionAccess.Read, t);
n++;
}
}
}
string writeTarget = ep.GetPathList(EnvironmentPermissionAccess.Write);
if (writeTarget != null)
{
string[] targets = writeTarget.Split(';');
foreach (string t in targets)
{
if (writeList.Contains(t))
{
result.AddPathList(EnvironmentPermissionAccess.Write, t);
n++;
}
}
}
return((n > 0) ? result : null);
}
