Simple .NET/ASP.NET PDF document editor web control SDK

One way to approach library design with F# is to simply design libraries according to the .NET Library Design Guidelines. This implicitly can mean avoiding or minimizing the use of F#-specific or F#-related constructs in the public API. We will call these libraries vanilla .NET libraries, as opposed to libraries that use F# constructs without restriction and are mostly intended for use by F# applications. Designing vanilla .NET libraries means adopting the following rules:

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Let s begin by logging in as sys and creating an admin account with the dba role. This account s only use is to create other accounts in the database used by our application.

Realize that there are only specific circumstances where this type of solution benefits your application. The first is, obviously, a thin client pipe. If you re writing an intranet application on a 100mbps LAN, you really don t need to worry about the size of ViewState. It s just not going to make that big of a difference. Even with a thin client pipe, the extra round trip to the database must be taken into account. If you re not using a Web Farm, you can put a dedicated instance of SQL Server on the web server to act as an exclusive ViewState server. This saves you a network round trip, but still introduces a process hop. If you re binding a grid, it may be just as expensive to marshal this state data to the database and back as it would be to rebind the grid with the original data. As with all things in application architecture, the solution that makes the most sense depends on your specific requirements and circumstance. The class above will work in both 1.x and 2.0. It will be useful more often in 1.x implementations, as the introduction of ControlState in 2.0 provides a solution for many situations where ViewState was previously imperative but can now be disabled.

Apply the NET Library Design Guidelines to the public API of your code Your internal implementation can use any techniques you want Restrict the constructs you use in your public APIs to those that are most easily used and recognized by NET programmers This means avoiding the use of some F# idioms in the public API Use the NET quality assurance tool FxCop to check the public interface of your assembly for compliance Use FxCop exemptions where you deem necessary At the time of writing, here are some specific recommendations from the authors of this book: Avoid using F# list types 'a list in vanilla NET APIs Use seq<'a> or arrays instead of lists Avoid using F# function types in vanilla NET APIs F# function values tend to be a little difficult to create from other NET languages Instead consider using NET delegate types such as the overloaded SystemFunc<...

Caution In this example, all passwords are the same as the username. This is obviously a bad idea in a

> types available from NET 35 onward Avoid using F#-specific language constructs such as discriminated unions and optional arguments in vanilla NET APIs For example, consider the code in Listing 19-1, which shows some F# code that we intend to adjust to be suitable for use as part of a NET API Listing 19-1 An F# Type Prior to Adjustment for Use as Part of a Vanilla NET API open System type APoint(angle,radius) = member xAngle = angle member xRadius = radius member xStretch(l) = APoint(angle=xAngle, radius=xRadius * l) member xWarp(f) = APoint(angle=f(xAngle), radius=xRadius) static member Circle(n) = [ for i in 1.n -> APoint(angle=20*MathPI/float(n), radius=10) ] new() = APoint(angle=00, radius=0.

Post-cache substitution is a handy feature that is designed for performance optimization. It dovetails with output caching. The functionality is exposed via a web control named Substitution, but you can think of this feature as a modification to the output caching infrastructure present in version 1.x of ASP .NET.

sys@ORA10G> create user admin identified by admin default tablespace users; User created. sys@ORA10G> grant dba to admin; Grant succeeded. As discussed, we will have two schemas: db_app_data and db_data_access_layer. The schema db_app_data contains all the application objects (in our case, just tables) used in our application. The schema db_data_access_layer contains all the code (PL/SQL API) that works on the tables in the schema db_app_data. After connecting as admin, we create the db_app_data schema. admin@ORA10G> create user db_app_data identified by db_app_data default tablespace users quota unlimited on users; User created.