C# Web Api Upload File?

C# Web Api Upload File

  • Date Nov 23, 2018

Introduction This article showsan example of uploading a file in the ASP.NET Web API. Uploading the file from the client is a basic operation. The file can be upload to the web server. By default, the process of file uploading is asynchronous. The developers of ASP.NET use the HTML file input field.

  • Start Visual Studio 2010 and select “New Project” from the Start Page.
  • In the Template window, select “Installed template” -> “Visual C#” -> “Web”.
  • Choose “ASP. NET MVC 4 Web Application” then change its name.
  • Click on the “OK” button.

C# Web Api Upload File

MVC 4 Project window:

C# Web Api Upload File

Select “Web API” and click on the “OK” button.

Step 2 Change the name of “ValuesController” to “DocFileController.cs”.

  • In the Solution Explorer.
  • Select “Controller Folder” -> “ValuesController.cs”.
  • Rename the “ValuesController” to “DocFileController”.

Write this code:

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Net;
  5. using System.Net.Http;
  6. using System.Web.Http;
  7. using System.Web;
  8. using System.IO;
  9. namespace FileUpload.Controllers
  10. result = Request.CreateResponse(HttpStatusCode.Created, docfiles);
  11. }
  12. else
  13. return result;
  14. }
  15. }
  16. }

The code above uses the “POST” method. This method looks for the request object. If there is any posted file then it will generate on the server and it returns the full path of the file. If there is no posted file then it returns the 401 status and bad request. Step 3 Open the “index.cshtml” file then:

  • In the “Solution Explorer”.
  • Select “Views folder” -> “Home folder” -> “index.cshtml”.

And write this code in this file:

  1. < header >
  2. < div class = "content-wrapper" >
  3. < div class = "float-left" >
  4. < p class = "site-title" >
  5. < a href = "~/" > ASP.NET Web API File Upload
  6. < div id = "body" >
  7. < form name = "form1" method = "post" action = "api/docfile" enctype = "multipart/form-data" >
  8. < div >
  9. < label >
  10. Brows File
  11. < input name = "myFile" type = "file" />
  12. < div >
  13. < input type = "submit" value = "Upload" />

Step 4 Now execute the application; press F5. C# Web Api Upload File Click on the “Browse” button. C# Web Api Upload File Select one image and click on the “Open” button. It now shows the path of the file. C# Web Api Upload File Now click on the “Upload” button. C# Web Api Upload File Now it shows the path where the selected file is saved.
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Can we upload file using API?

Adding the MIME type – There are three ways to upload files to an API:

As the only content. As part of a multipart/form-data payload, mixed with other “normal” data. As part of a multipart/mixed payload, mixed with other multiple uploads.

When uploading a file as the only expected content, you can set the MIME type to exactly what you expect, and nothing special needs to be done. As an example, consider an API that allows you to upload GIF images; you would add image/gif to the Content Negotiation Content-Type whitelist in your service, and in your RPC controller or REST resource, grab the request content and process it: $request = $this->getRequest(); $imageContent = $request->getContent(); // Do something with the content – most likely write it to a file file_put_contents($fileName, $imageContent); Jumping to the last item, multipart/mixed, your content would have multiple parts, each likely representing a different content type; you might have one with a JSON structure, another with an image, and so on. The problems with this approach are numerous:

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Few clients support multipart/mixed well: many just outright do not support it ( wget, HTTPie, Postman, Advanced REST Client, Angular’s $http, jQuery, etc.), and some do not allow specifying a Content-Type per part. From the server side, there’s the question of how to handle the various parts. Are they named? If so, does that mean that a part with a JSON structure would go under that name? or is the name used to identify that particular structure so it can be merged into another structure? If the parts are not named, how should you deal with them? Do you go through them one by one? How should content negotiation be handled? Should the whitelist apply to each part? What happens if one part does not pass the whitelist – is the entire request rejected?

Due to the difficulties with both sending multipart/mixed responses as well as handling them, Apigility does not support that media type at this time. Now, finally, we’ll look at the middle option, multipart/form-data, This media type is natively supported by every client we’ve reviewed, and, in fact, is the only multipart type that is available on most of them.

Named data. These are parts with a Content-Disposition header that includes a name segment, but no filename segment. The body of the part is the data associated with that particular name. In terms of your API, each data part represents a field you are sending in the request. Files. These are parts with a Content-Disposition header that includes both a name and a filename segment. The file in the content will be associated with the given name, and the filename will be present as part of either the $_FILES PHP superglobal, or, in the case of PUT or PATCH requests, the files composed in the request.

There are still some down-sides to using multipart/form-data :

Nested structures are difficult to handle properly. Typically, you will need to serialize them on the client-side, and have logic server-side to deserialize. Most clients will pass a media type of application/octet-stream for any files sent as part of a multipart/form-data payload. Zend\Validator\File\* usually handles this situation well, however.

In order to upload files using multipart/form-data in your API, you will need to add the media type to the Content Type Whitelist for your service. Once that is done, you can follow the rest of this tutorial to handle file uploads.
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How do you upload a 5 GB file through your spa to Web API?

  • Date Sep 12, 2018

In this article, we will see a very simple method to upload large files in the Web API project using MultipartFormDataStreamProvider, We can create a Web API project in Visual Studio 2017/2015. I am using Visual Studio 2017 community edition. After some time, our project will be created with default templates. We must change the value of ” maxAllowedContentLength ” in ” requestLimits ” in web configuration file to 1GB. If your upload file size is more than 1GB, please change the settings accordingly. We gave the value in Bytes. We must change the settings under system,webServer node in the web.config file. We can add more settings in the web,config file for the location of our files to be stored. Our configuration part is over. Now, let’s create a new API controller. We can add the below code to this controller.

  1. public class FileuploadController : ApiController
  2. await content.ReadAsMultipartAsync(provider);
  3. return true ;
  4. }
  5. catch (Exception)
  6. }
  7. }

We created a provider variable with ” MultipartFormDataStreamProvider ” and content variable with ” StreamContent “. Then we added the Request headers to a content variable using a FOR Loop. Finally, we read the multi-part data from the content variable asynchronously.

  1. It will automatically create a file in the given folder.
  2. We gave the output path as a web configuration parameter) We can use the postman tool to test our Web API,
  3. Please run our Web API now.
  4. After our Web API loaded, we can come to postman tool and using POST method we can send a request to Web API.
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We must choose “form-data” in the body part and choose “File” as type. We can click the “Send” button now. After some time, we will get a result. We got a “true” result. That means, our file upload successfully completed. Now we can check the file location (which we mentioned in the the web.config file). Please note though our file uploaded successfully, we got a different random file name in the uupload location without any extension. We can add one simple step to rename the file name with the original file name.

  1. string uploadingFileName = provider.FileData.Select(x => x.LocalFileName).FirstOrDefault();
  2. string originalFileName = String.Concat(fileuploadPath, “\\” + (provider.Contents.Headers.ContentDisposition.FileName).Trim(new Char ));
  3. if (File.Exists(originalFileName))
  4. File.Move(uploadingFileName, originalFileName);

Please execute the postman with the same file again and see the difference. Please note, our file successfully uploaded with the original file name. We tested the application with a very small file (less than 2MB). Now we can test with a large-sized file ( File size is 708 MB). After some time, our large file will be uploaded successfully. You can now check the file upload folder and see the new file there. In this article, we saw very simple steps to upload large files in Web APIs. You can use the same code for any large file. As this is a Web API, we can use this with any client-side application (Windows or Web).
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How do I attach a file to API?

Click Edit next to the API you want to attach the file to. In the Documentation section, click Browse and identify the file that you want to upload, then click Open. Click Upload, then click Save.
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What are the 4 main types of Web APIs?

What are the different types of APIs? – When referencing APIs, we’re usually talking about a subcategory of APIs called web APIs. Web APIs are APIs that are accessed using the Hypertext Transfer Protocol (HTTP), the same protocol used for fetching and displaying web pages in browsers.
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CAN REST API transfer files?

Use the File transfer REST API to upload and download files using HTTP or HTTPS as the transport protocol and to list the contents of a directory. Uploads a file to any back-end application that supports REST APIs over HTTP or HTTPS protocol.
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How do I insert an image into Web API?

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Is Swagger REST or SOAP?

The objective of Swagger is to create a “RESTful contract for your API, detailing all of its resources and operations in a human and machine-readable format.” In this sense it is a functional equivalent of WSDL documents for SOAP, providing automatically generated descriptions that make it easier to discover and integrate with REST APIs.
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Can you send files over HTTP?

What is an HTTP File Transfer? – Definition from Techopedia An HTTP file transfer is the process of transferring a file between multiple nodes/devices using the HTTP protocol, or more generally, the Internet. It is one of the most commonly used methods for sending, receiving or exchanging data and files over the Internet or a TCP/IP-based network.

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HTTP file transfer is typically enabled and managed through a web browser. The browser is responsible for initiating and managing an HTTP connection between the sending and receiving device using HTTP commands. Once the connection is established, the files can be transmitted between devices. A common example of HTTP file transfer is the process of viewing webpages, where HTTP fetches web pages from the remote web server and displays them on the local computer’s browser.

A variant of HTTP file transfer is the HTTPS file transfer that adds encryption and security to the data transmission process. Share this Term : What is an HTTP File Transfer? – Definition from Techopedia
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What is API upload?

API:Upload Toggle the table of contents

This page is part of the documentation.


MediaWiki version:

POST request to upload a file. There are three methods of uploading files via the API:

  1. Uploading a local file directly
  2. Uploading a copy of a file from a URL
  3. Uploading a local file in chunks

All of these methods require an account with the upload right.
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Can API be used to transfer data?

Data Transfer API overview | Google Developers Stay organized with collections Save and categorize content based on your preferences. The Data Transfer API manages the transfer of data from one user to another within a domain. One use case of this transfer is to reallocate application data belonging to a user who has left the organization.

Note: Not all Google Workspace applications work with the Data Transfer API. To find the current list of applications and their IDs, read the reference or call the method. To move the data, first define a resource, then initiate the transfer using the method. For example, the following JSON request body transfers a calendar from the source user to the destination user.

You can retrieve the user IDs for each owner by calling the method of the Directory API and providing their email address or email alias. ] } ] } The Data Transfer API includes additional methods and resources to help you construct and administer transfers:

applications available for data transfer application information by application ID transfers by source user, destination user, or status a transfer request by resource ID

Except as otherwise noted, the content of this page is licensed under the, and code samples are licensed under the, For details, see the, Java is a registered trademark of Oracle and/or its affiliates. Last updated 2022-11-02 UTC. : Data Transfer API overview | Google Developers
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What is API upload?

API:Upload Toggle the table of contents

This page is part of the documentation.


MediaWiki version:

POST request to upload a file. There are three methods of uploading files via the API:

  1. Uploading a local file directly
  2. Uploading a copy of a file from a URL
  3. Uploading a local file in chunks

All of these methods require an account with the upload right.
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Can we upload file in Postman?

First, set the body to ‘binary’: Select ‘binary’ to have Postman send binary data. Now click ‘Select File’ in Postman to attach a file: Attach a file to upload with the ‘Select File’ button.
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Is API same as FTP?

What is an API integration? – API, or an Application Programming Interface, allows for secure connections between two software systems. Many accounting programs will mention if they have API capabilities or add-in applications you can use to integrate them.
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