Sorry if my question seems a little noobish but I can't find an answer. I would like to use DirectInput for my XNA game. I've read around and it seems this is the best way to get input from a gamepad other than a XBox 360 controller. The first step is to include the Microsoft.DirectX.DirectInput namespace however I don't quite know how. Simply putting it in at the beginning of my class doesn't work, visual C# doesn't recognize it.
This got me thinking should I download the DirectX SDK? There is alot of stuff in there and the file is big how do I just download the single namespace? Is this even possible? If I can download the single namespace where do I put the file?
Now you can see all the questions racking around in my brain. So how do I make visual C# recognize the Microsoft.DirectX.DirectInput namespace so I can use the methods, properties and all that good stuff?
Thanks!
You need to set a reference to the DLL containing the code library you'd like to use. Presumably that's part of the SDK, so yes, you should download it. Then, in Visual Studio
open the solution explorer
open the project where you want to use the library
right-click the references node for that project
choose "add reference"
navigate to and select the dll
Once you've added the reference successfully, VS should recognize the using directive (and any types you've used from the assembly).
Note that references are made to assemblies; assemblies are not the same as namespaces. Beginners often confuse the two. Types that are defined in different assemblies can be in the same namespace; the BCL has dozens of examples of this.
Furthermore, the "using" directive doesn't cause anything to be loaded or anything like that; it just allows you to specify types without fully qualifying the names. In fact, it's possible to code in C# without ever using a using directive. For example, the following code files are equivalent:
using System.Collections.Generic;
public static class Collector
{
public static ICollection<T> Collect(IEnumerable<T> enumerable)
{
return new List<T>(enumerable);
}
}
AND
public static class Collector
{
public static System.Collections.Generic.ICollection<T> Collect(System.Collections.Generic.IEnumerable<T> enumerable)
{
return new System.Collections.Generic.List<T>(enumerable);
}
}
Download the SDK. It will not be redistributed with your app.. but everything you need to dev DirectX apps will be included in there. When installed there will be new entries in the "Add Reference" dialog.
In order to leverage DirectX you will need to download the SDK.
It is simply not possible to download a part of it. Even if it was, I would never recommend doing that.
Related
In Visual Studio 2022 we have the classic search function with which we can find a particular string of text in our solution. I'm wondering if there is a way to lookup all the classes inside a file that are defined in a package that is imported via the using directive.
Say for example i'm using package x.Business in my namespace using x.Business; is there a way to then lookup the classes inside this namespace which are coming from this imported package?
What I think you're asking is... "In any class file in my own solution, I want to be able to identify which types used in it (for parameters, variables, etc) are from a particular assembly that is in a using directive."
I don't know of any tool that does this, but the easiest way to identify usages in your file is to comment out the using directive. Any types, methods, etc that exist in that namespace will turn red showing that they can't be found.
(By the way, now is a good time to learn the proper term for those lines at the top of the class files. They're called "using directives", and they're not importing a whole package necessarily, but rather a particular namespace. Not to be confused with "using statements", which are a statement you can write inside of a method that automatically handles disposing of resources.)
What is the use of the "References" list in my visual studio project? Why I can still get my project compiled and run it even though I remove all of the references?
When I create a new c# console project, it has a hello world template program, and the References list contains certain references from .Net I think. I removed all of them and the template program still work, why?
The template program has a bunch of usings that were in the references of the project so I thought if I remove all of them nothing will work, but the project still compiled and ran.
This seems to be a very simple question but I can not find anybody answering that online.
Say you need to create an image processing app. But you don't want to, or rather won't be able to create a JPEG encoder/decoder. So you will find a 3rd party library to do the encoding/decoding. And the 3rd party library needs to be put somewhere so that your project can find it. And that is the References folder (it is not really a folder).
Then you can use the 3rd party library's namespace in your own code. And it compiles. But if you remove the references, it won't because VS won't be able to find those namespaces.
If later you decide not to use this library, you will remove your using statement and all the relevant code. At this point, if you remove the references, your code will still compile because they are not used at all.
Ok to answer my question after some research and tests. There are indeed namespaces I can not reference if I don't add them into the References list, the ones that were still working after I removed references were the ones that are implicitly referenced by visual studio.
I have learned that from the links below.
https://learn.microsoft.com/en-us/visualstudio/ide/managing-references-in-a-project?view=vs-2019
https://social.msdn.microsoft.com/Forums/vstudio/en-US/92a0c975-e350-4d8d-af8e-36ec0ad6c95c/specific-purpose-of-mscorlib-dll-in-net?forum=clr
I'm in C# land today. I'm trying to write a function which accepts a user agent string and returns an object that gives me at least the browser name and version. So I tried this answer, but apparently I don't have access to HttpBrowserCapabilities. It tells me the type or namespace name could not be found (yes, even if I add using System.Web, it still doesn't show up, or when I type using System.Web. it doesn't pop up, so it's obviously not there).
I'm using .net 3.5, but the documentation for that class shows it existed even in 3.5, so I'm not sure what's going on. I have access to the browscap files - ini or xml. Am I going to have to write this from scratch?
Edit: I've fixed the reference problem. But Chrome is being reported as AppleMAC-Safari 5.0. I'm wondering if I'm going to need a completely different approach. PHP figures it out with the same ini file fine.
Adding a using block does not automatically import the DLL. All a using does is allow you to not write:
System.Web.HttpClient //Or whatever
All over the place, and use HttpClient instead.
You need to add a reference to System.Web to the project before any of its classes will be available to you.
Did you have a using System.Web; statement in your source file?
Here's a tip: if you're using Visual Studio, and you have a reference to the System.Web.dll in your project, if you type the name of a type and press Ctrl-. it will give you a popup menu to add the namespace reference to your source file.
Do you see it in the ObjectBrowser (assuming you are using Visual Studio)? I found the namespace this morning (granted I'm on 4.5 - but documentation shows it has been around since 3.5 and earlier)
I am brand new to Visual Studio. I have been coding in Java for many years but have taken on a project which requires me to use c# and visual studio 2012.
What I need to know is how to utilize a different SDK. I want to use something called Honeywell SDK instead of Visual Studios inherent SDK but I cannot find out where to change this setting. If anyone has an answer that would be greatly appreciated!
as a Java developer you are probably used to imports and presumably understand how to use the import statement to import the classes in a namespace.
In C#, the first thing you must do is add a reference to the library containing the methods you require - this is normally done by right clicking your project in Solution Explorer, clicking add reference, and then selecting browse to browse to the location what is normally a DLL containing the library methods in question.
Once you have added a reference to your project, you can access the classes in the library either using a fully qualified name, e.g. to access the Thread class in .NET's System.Threading namespace for example, fully qualified use would be as follows:
System.Threading.Thread thread = new Thread();
Alternatively, you can put a using directive at the top of each file where you intend to use the client to avoid the need for the fully qualified name. For example:
using System.Threading;
Then in code, you can simply use the shortened version of the class name by itself:
Thread thread = new Thread();
As you can see, the using directive is effectively C#'s equivalent of Java's import directive. Note that to import all classes in a namespace you do not need the .* wild card at the end of the using directive as you do an equivalent Java import statement.
In practice, you may need to refer to the documentation you have to confirm what namespaces they use, and what files you need to add references to to use their libraries as this detail will be vendor specific. For more detail and a more thorough explanation of the using directive then the MSDN documentation is likely to be the most helpful source:
http://msdn.microsoft.com/en-gb/library/sf0df423%28v=vs.80%29.aspx
and:
http://msdn.microsoft.com/en-gb/library/z2kcy19k%28v=vs.80%29.aspx
There is no inherent SDK per-se in a .NET project, though normally references to the .NET framework and default using directives will be added. You will probably find these useful as they contain core functionality and the references normally added by default in a new project will provide you access to things such as collections and so forth.
One final note is that C# has a using statement, as well as the using directive, so if searching for additional information on the directive, be careful not to confuse it for the using statement.
Can anyone tell clearly about the usage of header files and namespaces in C#?
Because in C++ I was using ******.h files to read library functions. And when I saw some sample programs in C# they were missing, Can anyone tell me why?
I'm using C# to develop a custom tool for a CAD application. Whenever I use the appropriate function to open the file (CAD file), the compiler is giving me an error stating that the function names which I supply are not available in the context. Here what does meant by context?
When I opened the help file of that CAD application the function which is responsible for opening the file has bee mentioned under a header file called uf_part.h. But there is an namespace called NXOpen.
I used the namespace as using NXOpen in Visual Basic, isn't that enough? DO I need to supply that header file as well? If so, how?
C# is more "programmer friendly". When dealing with files of the same project, instead of manually specifying "header file" every time, it will go and look in all the project files for a match according to the namespace.
To understand this, do the following steps:
Start new project in Visual Studio. (No matter what type, WinForms or Console)
Right click the project and add new class.
In your main class note you can see the new class you just added, without adding any header.
How this is done? Simply by having the same namespace to both classes. The .NET engine is smart enough to link all those classes together.
Now, when it comes to external code meaning code sitting in a different DLL file the trick is to add reference to that DLL (in Studio --> Right click project --> Add reference --> Browse) then you need to specify you are going to use that DLL by adding a using statement on top:
using ExternalDllName.ExternalNamespace;
That's about it. Unlike C++ you don't need to have .h file as .NET will automatically search the referenced DLL files for a match.
There's no such thing as header file in .net, because all needed metadata is contained in referenced assembly itself.
Have you referenced needed assembly in you project?
Also please mind that there's no such thing as "function" in C#, only class methods (which means that you have to specify object or static class in you call).
Also: General Structure of a C# Program
Compilers for modern languages, such as C# or Java store within compiled files information on the classes and methods they contain, and this information can be used to check the correctness of calls made from one source file to another or to library classes.
When C was invented disk space, memory and CPU power were precious resources and this approach would not have been possible. Header files were introduced to allow the compiler to check that different source files conformed to the same interface. When C++ was invented the approach described above could have been possible, but I guess that it was chosen to stick to the C one for compatibility reasons.