In the previous example, you used WriteAllText to create a text file that's got just one piece of data in it. The data you submitted in the form is in the file.
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Upload a file html how to#
If you run this code on a hosting provider's server and get errors, check with the hosting provider to find out how to set those permissions.Įnter values into the fields and then click Submit. However, when you publish your site to a hosting provider's web server, you might need to explicitly set those permissions. On your development computer this is not typically an issue. In order for your code to save files in the App_Data folder, the application needs read-write permissions for that folder. (For more information, see Introduction to ASP.NET Web Programming Using the Razor Syntax.) This tells ASP.NET that you're providing a verbatim string literal, and that characters like "/" should not be interpreted in special ways. Notice that the name of the first parameter has an character as a prefix. This method takes two parameters: the name (with path) of the file to write to, and the actual data to write. The WriteAllText method of the File object writes the data to the file. This folder is a special folder in ASP.NET that's used to store data files, as described in Introduction to Working with a Database in ASP.NET Web Pages Sites. The file is saved in the App_Data folder. (You can read more about how to work with file and folder paths in Introduction to ASP.NET Web Pages Programming Using the Razor Syntax.) (You can also pass a subfolder name to it, like ~/App_Data/, to get the path for that subfolder.) You can then concatenate additional information onto whatever the method returns in order to create a complete path. To get the path for the website root, you user the ~ operator (to represen the site's virtual root) to MapPath. This returns the complete path to your website. The solution is to use the MapPath method of the Server object. Moreover, for a hosted site (as opposed to on your own computer) you typically don't even know what the correct path is when you're writing the code.īut sometimes (like now, for writing a file) you do need a complete path. If a website is moved, an absolute path will be wrong. In websites, it's a bad practice to refer in code to absolute paths like C:\Folder\File.txt for files on the web server. Setting the location requires some special handling. You then create a variable ( dataFile) that contains the location and name of the file to store the data in. What you're creating with all this concatenation is a string that looks like this: an invisible line break at the end.) This adds a line break (a newline character). At the end of the data that you concatenate together, you add Environment.NewLine.
Notice that the comma separator is a string contained in quotation marks (","), because you're literally embedding a comma into the big string that you're creating. The code then concatenates the values of the separate variables into one comma-delimited string, which is then stored in a different variable. The first task is to get the user input and assign it to variables. In the code, you use the IsPost property to determine whether the page has been submitted before you start processing. Result: HTML markup creates the form with the three text boxes. Var userData = firstName + "," + lastName + Replace the existing content with the following: result = "" When the user submits the form, you'll store the user's input in a text file.Ĭreate a new folder named App_Data, if it doesn't exist already.Īt the root of your website, create a new file named UserData.cshtml. In this procedure, you'll create a page that contains a simple form with three input elements (first name, last name, and email address) and a Submit button. If you want to store data in a text file, you can use the File.WriteAllText method to specify the file to create and the data to write to it. (A text file that's used to store data is sometimes called a flat file.) Text files can be in different formats, like. For example, you might use text files as a simple way to store data for the site.
In addition to using a database in your website, you might work with files. This tutorial also works with WebMatrix 3.Ĭreating a Text File and Writing Data to It The Path object, which provides methods that let you manipulate path and file names.The File object, which provides a way to manage files.These are the ASP.NET programming features introduced in the article: How to let users upload one file or multiple files.How to read a file and display from it.How to append data to an existing file.How to create a text file and write data to it.If you want to upload images and manipulate them (for example, flip or resize them), see Working with Images in an ASP.NET Web Pages Site.
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