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{ CustomPrincipal principal = new CustomPrincipal(identity); Csla.ApplicationContext.User = principal; } return identity.IsAuthenticated; } public static void Logout() { CustomIdentity identity = CustomIdentity.UnauthenticatedIdentity(); CustomPrincipal principal = new CustomPrincipal(identity); Csla.ApplicationContext.User = principal; } public override bool IsInRole(string role) { CustomIdentity identity = (CustomIdentity)this.Identity; return identity.IsInRole(role); } } The BusinessPrincipalBase class implements System.Security.Principal.IPrincipal, which is the requirement for any .NET principal object. Notice that a CustomPrincipal object doesn t really do much work all the hard work is handled by the identity object: [Serializable()] public class CustomIdentity : ReadOnlyBase<CustomIdentity>, IIdentity { private List<string> _roles = new List<string>(); private bool _isAuthenticated; private string _name = string.Empty; public string AuthenticationType { get { return "Csla"; } } public bool IsAuthenticated { get { return _isAuthenticated; } } public string Name { get { return _name; } } protected override object GetIdValue() { return _name; } internal bool IsInRole(string role) { return _roles.Contains(role); }

private CustomIdentity() { /* require use of factory methods */ } [Serializable()] private class Criteria { private string _username; public string Username { get { return _username; } } private string _password; public string Password { get { return _password; } } public Criteria(string username, string password) { _username = username; _password = password; } } internal static CustomIdentity { return new CustomIdentity(); } UnauthenticatedIdentity()

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Listing 12-11 shows the code for rendering visual expressions. You may have noticed in the definition of the VisualElement type that the only directly drawable visual element is Symbol. The other constructors carry one or more visual elements that must be drawn recursively and according to a well-defined logic. The key observation in the rendering function in Listing 12-11 is that, when drawing each element, you pass in the x and y coordinates of the bounding box in which it is to be drawn. You also pass in the size of the parent box in which the element is to be aligned (as guided by the midline property). Listing 12-11. Rendering Visual Expressions type VisualExpr = ... member self.Render = let pt x y = PointF(float32 x, float32 y) let rec draw (gra: Graphics) opt x y psize = function

What this chapter covers: A function that creates a list of abbreviations used in a document A function that adds links to the sources of quotes in a document A function that creates a list of access keys available in a document

internal static CustomIdentity GetIdentity( string username, string password) { return DataPortal.Fetch<CustomIdentity>( new Criteria(username, password)); } private void DataPortal_Fetch(Criteria criteria) { // validate user identity against the database // and load the user's roles } } This CustomIdentity class inherits from Csla.ReadOnlyBase, and so is a fully functional business object in its own right. This means it has a private constructor and a factory method that the CustomPrincipal object can call to authenticate the user. It also has another factory method that returns an unauthenticated version of the object to support anonymous or guest users. The DataPortal_Fetch() method needs to include the data access code to authenticate the username and password values against the database. The _isAuthenticated field should be set accordingly. And if the credentials are valid, DataPortal_Fetch() must also load the user s roles into the _roles list. 8 will implement a working custom principal and identity class as part of a sample application.

| Symbol (s, size) -> let font = if opt.IsSuper then opt.SmallFont else opt.NormalFont let x', y' = size.CenterOnMidline psize x y gra.DrawString(s, font, opt.Brush, pt x' y') | Power (e1, e2, size) -> let x', y' = size.CenterOnMidline psize x y draw gra opt x' (y'+e2.Height) e1.Size e1 draw gra { opt with IsSuper=true } (x'+e1.Width) y' e2.Size e2 | Sequence (exps, size) -> let x', y' = size.CenterOnMidline psize x y List.fold_left (fun (x, y) (e: VisualElement) -> let psize' = { width = e.Width; height = psize.height; midline=size.midline; } draw gra opt x y psize' e x+e.Width, y) (x', y') exps |> ignore | Fraction (e1, e2, size) as e -> let psize1 = { psize with height=e1.Height; midline=e1.Midline } let psize2 = { psize with height=e2.Height; midline=e2.Midline } draw gra opt x y psize1 e1 gra.DrawLine(self.RenderOptions.Pen, x, y+size.midline, x+psize.width, y+size.midline); draw gra opt x (y+e1.Height+size.FracSepHeight opt) psize2 e2 let bmp = new Bitmap(self.Expression.Width, self.Expression.Height, PixelFormat.Format32bppArgb) let gra = Graphics.FromImage(bmp) gra.FillRectangle(new SolidBrush(Color.White), 0, 0, self.Expression.Width+1, self.Expression.Height+1) draw gra self.RenderOptions 0 0 self.Expression.Size self.Expression bmp

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