GetUpperBound 0 - 1. Show MyFiles1. To get the actual filenames, just loop through the string array In this case it IS the Length you want and not the upper bound. Length If you do want to use the names then assign the result of GetFiles to a variable first.
Also note that GetFiles behaves slightly differently when the extension specified is three characters long to when it is a different length. Why is my data not saved to my database? NET VB. Advertiser Disclosure: Some of the products that appear on this site are from companies from which TechnologyAdvice receives compensation. This compensation may impact how and where products appear on this site including, for example, the order in which they appear.
TechnologyAdvice does not include all companies or all types of products available in the marketplace. Remember Me? Since a solution is a container of projects, it does not make sense for the solution file to be inside the project directory.
For multiproject solutions, having the directory structure reflect the solution structure usually makes more sense—it is best to have a directory that contains your solution file, with subdirectories for each individual project. NET is happy to create this type of directory structure for you. When you create a new project by using the New Project dialog box Ctrl-Shift-N , you can bring up additional options by clicking on the More button in the lower-lefthand corner of the dialog.
These options are shown in Figure The More button turns into a Less button when the extra options are visible. If you select the Create directory for Solution checkbox, Visual Studio.
NET will not place the solution files in the same directory as the project. Instead, it will create a folder for your solution and inside this will create a second folder containing your project. The New Solution Name text box determines the name of both the solution and the solution folder.
You pick the project template you want to create as your first project and type its name in the Name text box as usual. NET project. With web projects, you will need to create a blank solution first in order to make your directory structure match your solution structure.
You can use the Location text box to choose the path for this New Solution Name and the Name text box to give it a name. A folder with your chosen name will be created at the specified path, and a new solution file with the same name as the folder will be placed there.
Matching the file structure of a solution and its contained projects to the logical structure has the advantage of making it easier to put together a zip file of the whole solution. Consider what happens if you just allow VS. NET to put new projects in the default locations when you create a new project and then add a second project to the solution.
If you zip the first project directory, the zip file will contain the solution file, but that solution file will refer to the second project directory. However, the second project directory will not be present in the zip file, because, by default, VS.
NET will make it a peer of the first project directory instead of a child. However, if you make the directory structure reflect the logical structure, with the project directories all being children of the solution directory, you can simply zip up the solution directory, and the zip file will contain all of the projects that belong to the solution.
Figure illustrates how the physical directory structure can reflect the logical structure of a project. Figure shows how Visual Studio. NET will organize the directory structure if left to its own devices—the physical structure is less closely related to the logical structure.
The solution file is located in an arbitrary project directory. Specifically, it is in the first project that was created in the solution. The project directories themselves may well be in the same directory as other, unrelated directories or files.
So, to avoid the mess shown in Figure , be sure to check the Create directory for solution checkbox. By default, VS. A certain amount of planning is required if you want to keep control over where web projects end up, because although the default locations chosen by VS.
NET for your files will work, they may not be the locations you were expecting, particularly if you let it create a new solution for a new web project. When you create a new web-based project, VS. NET communicates with the web server and checks to see whether an application already exists for the URL you specified.
The solution files, however, will be elsewhere—if you allow VS. NET to create a new solution for your web project and it will by default , it will create a directory for your solution in the default location, underneath your My Documents folder. If you want to remain in control of the location of your web projects and their solutions, you must first create a new blank solution.
Then use Windows Explorer to create a folder for your web-based project inside of your solution folder. You can get to the property page by right-clicking on the folder in Windows Explorer and selecting Properties.
Alternatively, you can use the IIS administration tool to set the new directory up as a web application. Once you have created the web shared folder, add a new web project to your solution.
Alternatively, use the New Project dialog Ctrl-Shift-N but select the Add to Solution radio button—this will add the new project to your existing blank solution instead of creating a new solution. You must specify the URL of the web share you created as the project location.
This will cause Visual Studio. NET to use your existing web folder instead of creating a new one. When you create web projects in this way, all of the files needed for that web project and the solution that contains it are kept in one place rather than two. When you create a folder that will contain a web-based project, you must make sure that the ASP.
NET worker process will be able to access that folder. The ASP. We shall now run through the main types of projects supported by VS. NET classifies projects by implementation language and then by project type in its New Project dialog box. However, many of the project types have a great deal in common despite using different languages, so although VS. NET Enterprise Edition lists more than 90 distinct types, most fall into one of six groups: managed local projects, managed web projects, Smart Device projects, unmanaged local projects, unmanaged web projects, and setup projects.
Your copy of Visual Studio. NET may have even more project types—third-party add-ins can extend the list. You can also add your own project templates—see Chapter 9. A managed local project will create a. NET assembly. Managed web projects do the same, but the project output is intended to be accessed by a client over a network connection, typically using either a browser or a web service proxy.
Web projects are therefore always associated with a web application on a web server. And although managed web projects produce a. NET assembly just like a managed local project, with a web project, Visual Studio. NET will place the assembly on the web server as part of the build process. A web project can reside on either a remote web server or the web server on your local machine.
NET does not make any distinction between these two styles of development. However, if you use a remote server, you may need to modify its security settings in order to debug a web application successfully. See Chapter 3 for more information on debugging web applications. Smart Device projects are available only in C and VB. These projects are not available with VS. NET An unmanaged local project builds an unmanaged file.
An unmanaged web project is the unmanaged counterpart of the managed web project type, in that its output will be deployed to and run from a web server.
Setup projects are used to create Windows Installer. A managed local application could be written in C , J , VB. An assembly containing at least one class derived from System. Each of these project types builds a. Web Control Libraries can be used in any number of web applications but are not specifically associated with any one web application in particular.
These projects simply produce a. The Visual Studio. NET projects, you could also use it to build Windows Forms applications. In VS. Note that the names of these project types changed between VS.
NET and VS. NET , so both names are given in the table. In a managed web-based project, the build output is copied to a web server and will run on that web server. The web server can be either the one on your local machine or a remote server. Of course, a web application typically needs more than just a compiled.
NET assembly to run—there are usually files containing content such as. So Visual Studio. NET does not just copy the compiled assembly to the web server—the entire project resides there. Arguably, slightly too much resides on the web server.
So you will find all of your source files on the server along with the content and build output. Source files are cached locally so that you can edit them and so that the compiler can compile them, but the permanent home of all project members and all build output is the web server. If you use a Setup and Deployment project to build an. So if you use this.
Also, ASP. NET is configured not to serve out source files by default, so even on your development server, attempts to download the source using HTTP will fail.
NET is also able to perform the deployment itself directly. NET will show the Copy Project dialog. NET Web Service. This project type is essentially the same as the VB. NET Web Service project. All of the VB. An empty web project is useful if you want to build either an ASP. NET web application or web service, but you do not want the default options or files generated by VS. Of course, you could also write your own wizard to generate files that are more to your liking—see Chapter 9.
Smart Device projects allow you to build applications that run on palmtop devices. These project types are not available on Visual Studio. Each language lists just one Smart Device project. However, both the C and VB. Detailed discussion of palmtop development is beyond the scope of this book. For more information on developing Windows Forms applications on the.
Unmanaged local projects build unmanaged executable files. See Table But the defining feature of a web project is that it is associated with a particular web application on a server.
It is up to you to work out how to deploy the extension to a server. Like managed web-based projects, these projects connect directly to your web server and can contain other types of files than just the DLLs. The setup and deployment projects included in VS. NET allow you to create Microsoft Installer files. See Chapter 6 for more information about these projects. A few project types stand on their own, rather than fitting into any broad category.
Database projects are described in Chapter 5. NET Add-in projects are described in Chapter 8. Appendix A contains a complete list of all project types. Now that we have seen the available project types in VS. NET, let us see how to add projects to a solution.
If you use the Ctrl-Shift-N shortcut to add a new project to an existing solution, make sure you select the Add to Solution radio button. By default, the Close Solution button will be selected, which will close your solution and create a brand-new solution for the new project! Both menu options show the Add New Project dialog box, which is almost identical to the New Project dialog box, except it will never close an existing solution.
Unfortunately, there is no keyboard shortcut for this dialog. Figure shows how this looks in the Solution Explorer. The following sections describe how to add new or existing files to a project and how to remove files from a project. You can add a new file to your project by right-clicking on the project in the Solution Explorer and selecting an item the Add submenu, which is shown in Figure The same choices are also available from the main Project menu. The options these menus will offer depends upon the project type you are using e.
The list of items offered on the menus is not comprehensive; it merely shows the most commonly used items. See Appendix B for a list of the available items, and see Chapter 9 for more information about customizing the items and adding your own. Sometimes you will want to add an existing file to a project. Or just use the Shift-Alt-A shortcut. When you add an existing item, Visual Studio. NET will either use the existing file directly or copy the file into the project directory.
The behavior it chooses depends on the type of project and where the file is located. Table shows the behavior of the various project types. With VB. NET, C , and J projects, if the file is already inside the project directory, no copy will be made. Otherwise, VS. NET will copy the file into the project directory.
If you would like to force VS. NET to use the original file when it would normally make a copy, you can choose to link the file instead. If you look at the Open button on the Add Existing Item dialog, you will see that it has a drop-down arrow on its right. If you click on this, it pops up a menu with a Link File option. If you select this option, VS. NET will add the original file to the project, even when it would otherwise have made a copy.
The Link File option is not available on web projects. With files already in the project directory on the web server, no copy will be made. Linking to a file in a different web directory is not supported. If you wish to move a file between two projects in the same solution, you can simply use drag and drop in the Solution Explorer. You can also just press the Delete key.
For some project types, there will be a Remove option instead of a Delete option. Whether you see Remove or Delete will depend on the project type—VB. Although C and VB. NET projects provide the destructive Delete option instead of Remove, you may still remove an item from these project types nondestructively.
Instead of selecting Delete, you can select Exclude from Project. This takes the file out of the project but leaves the file in place on your hard drive—in other words, this does exactly what Remove does on other project types. You can move the focus to the properties window by pressing the F4 key. The properties shown will depend on the type of file and the type of project.
Most files have very few properties, and the only properties common to all files regardless of type are Name and FullPath those being the name of and path to the file.
We will discuss type-specific file properties as we look at the individual file types in question. Some files do not belong to any particular project in a solution.
For example, you may have a solution that contains multiple web applications, all of which share a single Cascading Stylesheet. You could arbitrarily pick one of the projects and make the file a member of it, but this does not accurately reflect how the file is used and could confuse other developers who use your code. NET lets you add files to a solution without making them a member of any particular project. Such files are called solution items.
Solution items will not be compiled. Only files that belong to projects are compiled. Solution items are therefore typically some form of content or documentation.
You can add any file type you like to a solution. Figure shows how VS. NET displays solution items in the Solution Explorer. If you use the Add Existing Item dialog box, however, the items can live in any folder i. This is useful because it allows you to give yourself easy access to files in projects outside of your solution. Suppose you are writing a program that consumes a web service. It may be useful to have access to the WSDL file for that service.
This WSDL file will not be part of your client project—it will be supplied by the web service itself. You could also simply include the Web Service project in your solution, but that may slow down your load time and would also make it easier to modify and rebuild the project by accident. But if you just add the WSDL file to your solution as a solution item, it will be available in the Solution Explorer whenever you need it, without the need to include the project in the solution you are working on.
NET from Windows Explorer. This is useful because it allows you to edit files with a minimum of fuss. NET calls these files miscellaneous files. You can get VS. NET to display all open miscellaneous files in the Solution Explorer. Remember that solutions do not just contain projects—they also hold information on the relationships between those projects. So once you have the projects you require in your solution, you must make sure Visual Studio.
NET knows about the dependencies between them so that the projects will be built correctly. NET projects, this is done by setting up references from one project to another.
All projects have a list of references, which is shown in the Solution Explorer directly beneath the project node. See Figure Each item in this list represents a reference to some external component that your project uses. These external components can be. With a. For COM components, either include the appropriate header files or use the import directive on the relevant type library.
Adding a reference can serve up to four purposes:. NET projects, it causes Visual Studio. If the component referred to is another project, Visual Studio. NET will infer dependency information from this and will use this information to work out the right order in which to build projects.
NET will load the type information contained in the referenced components and use it to provide IntelliSense—the pop-up lists of statement completion suggestions. IntelliSense is described in more detail in the next chapter. You can also browse the type information for all referenced components using the object browser.
NET will automatically add any necessary references to your project. To add a reference to your project , right-click on it in the Solution Explorer and select Add Reference. You can also select Add Reference from the context menu for the References node in the Solution Explorer. This brings up the Add Reference dialog box, which is shown in Figure There are three tabs on this dialog, one for.
The following example returns all files in the directory and adds them to ListBox1. The path is not valid because it is Nothing ArgumentNullException.
The path exceeds the system-defined maximum length PathTooLongException. A file or directory name in the path contains a colon : or is in an invalid format NotSupportedException. The user lacks necessary permissions to view the path SecurityException.
The user lacks necessary permissions UnauthorizedAccessException. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy.
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