ASP.NET PDF Viewer using C#, VB/NET

This is the first line This is the second File exists: false This is all pretty much as you might expect. When a source file is compiled into an assembly, none of the code in it will execute until a value from it is used by a currently executing function. Then, when the first value in the file is touched, all the let expressions and top-level statements in the module will execute in their lexical order. When a program is split over more than one module, the last module passed to the compiler is special. All the items in this module will execute, and the other items will behave as they were in an assembly. Items in other modules will execute only when a value from that module is used by the module currently executing. Suppose you create a program with two modules. This is ModuleOne.fs: #light module ModuleOne print_endline "This is the third and final" This is ModuleTwo.fs: #light module ModuleTwo print_endline "This is the first line" print_endline "This is the second" If this is compiled with the following: fsc ModuleOne.fs ModuleTwo.fs -o ModuleExecution.exe this will give the following result: This is the first line This is the second This might not be what you expected, but it is important to remember that since ModuleOne was not the last module passed to the compiler, nothing in it will execute until a value from it is used by a function currently executing. In this case, no value from ModuleOne is ever used, so it never executes. Taking this into account, you can fix your program so it behaves more as you expect. Here is ModuleOne.fs: module ModuleOne print_endline "This is the third and final" let n = 1

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doesn t even throw any errors or give you a clue as to why the rows are not displayed even though they are appended to the table. In this case, the workaround is simple. Internet Explorer will allow tr elements to be added to a tbody element, just not directly to the table element. For example, if you defined an empty table like this: <table id="myTable"> <tbody id="myTableBody"></tbody> </table> the correct way to add a row to the table would be to add the row to the table body instead of to the table, like so: var cell = document.createElement("td").appendChild(document.createTextNode("foo")); var row = document.createElement("tr").appendChild(cell); document.getElementById("myTableBody").appendChild(row); Fortunately, this method works in all modern browsers, including Internet Explorer. Stay in the habit of always using table bodies within your tables, and you ll never have to worry about this issue.

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Here is ModuleTwo.fs: module ModuleTwo print_endline "This is the first line" print_endline "This is the second" let funct() = Printf.printf "%i" ModuleOne.n funct() If this is compiled with the following: fsc ModuleOne.fs ModuleTwo.fs -o ModuleExecution.exe it will give the following result: This is the first line This is the second This is the third and final 1 However, using this sort of trick to get the results you want is not recommended. It is generally best only to use statements at the top level in the last module passed to the compiler. In fact, the typical form of an F# program is to have one statement at the top level at the bottom of the last module that is passed to the compiler.

Optional compilation is a technique where the compiler can ignore various bits of text from a source file. Most programming languages support some kind of optional compilation. It can be handy, for example, if you want to build a library that supports both .NET 1.1 and 2.0 and want to include extra values and types that take advantage of the new features of version 2.0. However, you should use the technique sparingly and with great caution, because it can quickly make code difficult to understand and maintain. In F# optional compilation is supported by the compiler switch --define FLAG and the command #if FLAG in a source file. The following example shows how to define two different versions of a function, one for when the code is compiled for .NET 2.0 and the other for all other versions of .NET: #light open Microsoft.FSharp.Compatibility #if FRAMEWORK_AT_LEAST_2_0 let getArray() = [|1; 2; 3|] #else

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