/// <summary>Creates and returns a permission that is the intersection of the current permission and the specified permission.</summary>
/// <returns>A new permission object that represents the intersection of the current permission and the specified permission. This new permission is null if the intersection is empty.</returns>
/// <param name="target">A permission to intersect with the current permission. It must be of the same type as the current permission. </param>
/// <exception cref="T:System.ArgumentException">The <paramref name="target" /> parameter is not null and is not of the same type as the current permission. </exception>
public override IPermission Intersect(IPermission target)
{
SecurityPermission securityPermission = this.Cast(target);
if (securityPermission == null)
{
return(null);
}
if (this.IsEmpty() || securityPermission.IsEmpty())
{
return(null);
}
if (this.IsUnrestricted() && securityPermission.IsUnrestricted())
{
return(new SecurityPermission(PermissionState.Unrestricted));
}
if (this.IsUnrestricted())
{
return(securityPermission.Copy());
}
if (securityPermission.IsUnrestricted())
{
return(this.Copy());
}
SecurityPermissionFlag securityPermissionFlag = this.flags & securityPermission.flags;
if (securityPermissionFlag == SecurityPermissionFlag.NoFlags)
{
return(null);
}
return(new SecurityPermission(securityPermissionFlag));
}
public override IPermission Intersect(IPermission target)
{
SecurityPermission sp = Cast(target);
if (sp == null)
{
return(null);
}
if (IsEmpty() || sp.IsEmpty())
{
return(null);
}
if (this.IsUnrestricted() && sp.IsUnrestricted())
{
return(new SecurityPermission(PermissionState.Unrestricted));
}
if (this.IsUnrestricted())
{
return(sp.Copy());
}
if (sp.IsUnrestricted())
{
return(this.Copy());
}
SecurityPermissionFlag f = flags & sp.flags;
if (f == SecurityPermissionFlag.NoFlags)
{
return(null);
}
else
{
return(new SecurityPermission(f));
}
}