Filestreamresult Mvc Download

Controllers-Function-content-.png' alt='Filestreamresult Mvc Download' title='Filestreamresult Mvc Download' />In this article we are going to see about uploading and returning files in an MVC application. We will also see how we can apply validations to the POSTed files. Receba o curso via Download. Vdeo Aulas com Projetos Completos e Exerccios Resolvidos sobre ASP. NET MVC Contedo e durao de cada vdeo aula. Ive run into similar problems and Ive stumbled accross a solution. I used two posts, one from stack that shows the method to return for download and another one. ASP. NET MVC Uploading and Downloading Files. You might already be ahead of me at this point, and wondering how you might make use of the fact that Request. Files is a collection. That suggests that it can accommodate more than one file, and indeed, it can. If you change the original View to this The code in the controller Action already checks all file uploads, so no changes are needed for it to work with multiple file uploads. Notice that each input has a different name attribute. If you need to reference them individually, that is what you use. For example, to reference the third one, you would get at it using Request. FilesFile. Upload. Saving to a Database. Before you scream Separation of Concerns at me, the next piece of code is purely illustrative. It features ADO. NET within a controller action. As we all know, this is simply not done. Database access code belongs to your data access layer somewhere inside the Model. However, the code should give people a starting point if they want to save uploaded files to a database. First of all, I have created a database File. Test and added a table File. Store CREATE TABLE dbo. File. Store. ID int IDENTITY1,1 NOT NULL. File. Content image NOT NULL. Mime. Type nvarchar5. NOT NULL. File. Name nvarchar5. NOT NULLON PRIMARY TEXTIMAGEON PRIMARY. The File. Content field is an image datatype, and is where the binary data that forms the file will be stored. X-GE5u-Fo/U8I7NWcbNoI/AAAAAAAAD_A/Z_hCHI1D72A/s1600/ajax-fileupload-in-asp.net.jpg' alt='Filestreamresult Mvc Download' title='Filestreamresult Mvc Download' />The Index Action is changed to the following public Action. Result Index. foreach string upload in Request. Filestreamresult Mvc Download' title='Filestreamresult Mvc Download' />Files. Request. Filesupload. Has. File continue. Type Request. Filesupload. Content. Type. Stream file. Stream Request. Filesupload. Input. Stream. string file. Name Path. Get. File. NameRequest. Filesupload. File. Name. int file. Length Request. Im encountering a problem sending files stored in a database back to the user in ASP. NET MVC. What I want is a view listing two links, one to view the file and let. If you come to ASP. NET MVC from a purely ASP. NET Web Forms background, one of the first things you are likely to notice is that all those nice easy Server Controls. Filesupload. Content. Length. byte file. Data new bytefile. Length. file. Stream. Readfile. Data, 0, file. Length. const string connect Server. SQLExpress DatabaseFile. Test TrustedConnectionTrue. Sql. Connectionconnect. INSERT INTO File. Store File. Content, Mime. Type, File. Name VALUES File. Content, Mime. Type, File. Name. var cmd new Sql. Commandqry, conn. Parameters. Add. With. ValueFile. Content, file. Data. cmd. Parameters. Add. With. ValueMime. Type, mime. Type. Game Bomberman For Windows 7'>Game Bomberman For Windows 7. Parameters. Add. With. ValueFile. Name, file. Name. conn. Open. ZGAT9Ao/hqdefault.jpg' alt='Filestreamresult Mvc Download' title='Filestreamresult Mvc Download' />The internet is an important and mandatory part of modern life, including the 285 people million worldwide who have some form of visual impairment 1. Uploading and downloading files are common functions youll see in most websites and apps. Fortunately, its easy to write code to upload and download files using. Execute. Non. Query. View. The revised code still loops through as many uploads as are on the web page, and checks each one to see if it has file. From there, it extracts 3 pieces of information the file name, the mime type what type of file it is and the actual binary data that is streamed as part of the HTTP Request. The binary data is transferred to a byte array, which is what is stored in the image datatype field in the database. The mime type and name are important for when the file is returned to a user. We shall look at that part next. Serving Files to the User. How you deliver files back to users will depend on how you have stored them primarily. If you have them stored in a database, you will usually stream the file back to the user. If they are stored on a disk, you can either simply provide a hyperlink to them, or again, stream them. Whenever you need to stream a file to the browser, you will use one of the overloads of the File method instead of the View method that has been used so far in the preceding examples. There are 3 different return types of the File method a File. Path. Result, File. Content. Result and a File. Stream. Result. The first streams a file directly from disk the second sends a byte array back to the client, while the third sends the contents of a Stream object which has been generated and opened. If you remember, when saving the uploaded files into a database, we sent a byte array to the File. Content field. When we need to get that back, it will be as a byte array again. If you have been keeping up, this means that we can use one of the two overloads of File that return a File. Content. Result. If you want the name of the file to be meaningful, you will use the overload that takes 3 arguments the byte array, the mime type and the file name public File. Content. Result Get. Fileint id. Sql. Data. Reader rdr byte file. Content null. string mime. Type string file. Name. const string connect Server. SQLExpress DatabaseFile. Test TrustedConnectionTrue. Sql. Connectionconnect. SELECT File. Content, Mime. Type, File. Name FROM File. Store WHERE ID ID. Sql. Commandqry, conn. Parameters. Add. With. ValueID, id. Open. Execute. Reader. Has. Rows. rdr. Read. Content byterdrFile. Humansoftware Plugins. Content. mime. Type rdrMime. Type. To. String. Name rdrFile. Name. To. String. Filefile. Content, mime. Type, file. Name. The easiest way to invoke this method is to provide a hyperlink lt a hrefGet. File1 Click to get filelt a If the files in the database are images, instead of a hyperlink, you just point to the controller action within the src attribute of an lt img element lt imgsrcGet. File1 altMy Image Well have a look at how to simply use the File. Path. Result now. This is used to stream files directly from disk public File. Path. Result Get. File. From. Disk. App. Domain. Current. Domain. Base. Directory uploads. Name test. txt. Filepath file. Name, textplain, test. And this is also invoked via a simple hyperlink lt a hrefGet. File. From. Disk Click to get filelt a The final option File. Stream. Result can be used to serve files from disk too public File. Stream. Result Stream. File. From. Disk. App. Domain. Current. Domain. Base. Directory uploads. Name test. txt. Filenew File. Streampath file. Name, File. Mode. Open, textplain, file. Name. So whats the difference between File. Path. Result and File. Stream. Result and which one should you use The main difference is that File. Path. Result uses Http. Response. Transmit. File to write the file to the http output. This method doesnt buffer the file in memory on the server, so it should be a better option for sending larger files. Its very much like the difference between using a Data. Reader or a Data. Set. On the other hand, you might need to check the server you are hosting your site on, as a bug in Transmit. File may lead to partial delivery of files, or even complete failure. File. Stream. Result is a great way of, for example, returning Chart images generated in memory by the ASP. NET Chart Controls without having to save them to disk.