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// Detach event handler from previous control. if ((controlToValidate != null) && (!DesignMode)) { controlToValidate.Validating -= new CancelEventHandler(ControlToValidate_Validating); } controlToValidate = value; // Hook up the control's Validating event. if ((controlToValidate != null) && (!DesignMode)) { controlToValidate.Validating += new CancelEventHandler(ControlToValidate_Validating); } } } When the Validating event fires, the BaseValidator simply calls the public Validate() method, and optionally stops the focus from changing. // Validate the control when the Validating event fires. private void ControlToValidate_Validating(object sender, CancelEventArgs e) { Validate(); // Cancel the focus change if the data is invalid, // and this is the configured behavior. if (!isValid && cancelFocus) e.Cancel = true; } In turn, the Validate() method calls the abstract EvaluateIsValid() method, which each validator overrides with its custom validation code. Then, depending on the success or failure of validation, the error icon is updated. // This is a public method so that validation can be triggered // manually if you want, not just in response to the Validating event. public bool Validate() { // Validate the control (using whatever functionality // is provided in the derived class). isValid = EvaluateIsValid(); if (isValid) { // Clear the error message. errorProvider.SetError(controlToValidate, ""); }

You can use two or more attributes by separating the attributes with semicolons: open System open System.Drawing.Printing open System.Security.Permissions [<Obsolete; PrintingPermission(SecurityAction.Demand)>] let functionFive () = () So far, you ve used attributes only with values, but using them with type or type members is just as straightforward. The following example marks a type and all its members as obsolete: open System [<Obsolete>] type OOThing = class [<Obsolete>] val stringThing : string [<Obsolete>] new() = {stringThing = ""} [<Obsolete>] member x.GetTheString () = x.stringThing end If you intend to use WinForms or Windows Presentation Foundation (WPF) graphics in your program, you must ensure that the program is a single-thread apartment. This is because the libraries that provide the graphical components use unmanaged code (not compiled by the CLR) under the covers. The easiest way to do this is by using the STAThread attribute. This must modify the first do statement in the last file passed to the compiler; that is, the first statement that will execute when the program runs: open System open System.Windows.Forms let form = new Form() [<STAThread>] Application.Run(form) Once you attach attributes to types and values, it s possible to use reflection to find which values and types are marked with which attributes. You usually do this with the IsDefined or GetCustomAttributes methods of the System.Reflection.MemberInfo class, which means these methods are available on most objects used for reflection, including System.Type. The next example shows you how to look for all types that are marked with the Obsolete attribute:

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else { // Display the error message. errorProvider.SetError(controlToValidate, errorMessage); } return isValid; } // This is the method where the derived classes will // execute their validation logic. protected abstract bool EvaluateIsValid(); All in all, this gives you a solid framework for building custom validation controls, as demonstrated in the next section.

Note It s worth pointing out that this design has one limitation if a control is already valid when you

The User Accounts tab has four columns: Name: Lists the name of the person that the user account belongs to Logon Name: Lists the user account name, which is what is used to log on with Remote Access: Lists whether the account is allowed to use the remote access features Status: Lists whether the account is enabled or disabled You will also notice three buttons available above the Name column: Add: Used to add a user account Properties: Used to view and change the properties of a user account, including the password, among other things Remove: Used to remove the user account To add a new Windows Home Server user account, perform the following steps: 1. Click the Add button to open the Add a New User to Your Home Server screen, shown in Figure 6-4.

open System // create a list of all obsolete types let obsolete = AppDomain.CurrentDomain.GetAssemblies() |> List.ofArray |> List.map (fun assm -> assm.GetTypes()) |> Array.concat |> List.ofArray |> List.filter (fun m -> m.IsDefined(typeof<ObsoleteAttribute>, true)) // print the lists printfn "%A" obsolete Executing the preceding code produces the following results: [System.ContextMarshalException;( System.Collections.IHashCodeProvider; System.Collections.CaseInsensitiveHashCodeProvider; System.Runtime.InteropServices.IDispatchImplType; System.Runtime.InteropServices.IDispatchImplAttribute; System.Runtime.InteropServices.SetWin32ContextInIDispatchAttribute; System.Runtime.InteropServices.BIND_OPTS; System.Runtime.InteropServices.UCOMIBindCtx; System.Runtime.InteropServices.UCOMIConnectionPointContainer; ... You ve seen how you can use attributes and reflection to examine code; now let s look at a similar, but more powerful technique for analyzing compiled code, called quotation.

attach it to a validator, the IsValid property will still return false. That s because validation won t be performed until the user tabs over to the control and moves away, so that the Validating event fires. There are two possible work-arounds. You can trigger the validation as soon as the control is connected (which has the disadvantage of showing the error icon immediately), or you can make sure you call the Validate() method of each validator before you check the IsValid property (for example, when the user clicks the OK button to move on to another form).

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