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Return or Download File in blogger.com Core WebAPI | TheCodeBuzz
The DownloadFile method downloads to a local file data from the URI specified by in the address parameter. This method blocks while downloading the resource. To download a resource and continue executing while waiting for the server's response, use one of the DownloadFileAsync methods 28/8/ · With a large file, or a large number of simultaneous downloads the server will run out of memory because of large object heap fragmentation. How to handle large files with blogger.com core 2? It seems despite of using a FileStreamResult there still is a file buffering. It was easy to remove buffering with classic blogger.com (blogger.com = false 20/11/ · If you already have a controller, add an Action that return PhysicalFile for file on your disc or File for binary file in memeory: [HttpGet] public ActionResult Download (string fileName) { var path = @"c:\blogger.com"; return PhysicalFile (path, "text/plain", fileName); } To file path from project folder inject IHostingEnvironment and get
Dotnet core download file
Posted by Code Maze Updated Date Jan 14, 2. After successfully learning how to upload files, the logical next step is to learn how to download them as well.
As in the previous articlefor downloading purposes, we are going to work with pictures. Feel free to apply this implementation logic to other types of files. In this part, since we are adding new functionality, we will first adjust the current implementation.
The adjustments will cover the addition of a service that contains all the desired logic for handling files in general. That way, dotnet core download file, we are improving readability and opening opportunities for extending the dotnet core download file in the future with more file handling operations. Currently, we have an upload button in our form for creating a user. When we create a user, dotnet core download file, the uploaded picture becomes the profile picture.
For the sake of simplicity, we will reuse the current implementation and extend it to implement file download. That said, the pictures that we upload during user creation will be the files that we are going to download after. That way we are wrapping up the file handling logic into one controller that contains endpoints for every operation.
Given that we are focusing on a file download, the next step is to extend the controller with a new endpoint for download operation. At the moment, the method will only return a successful result with a corresponding message:. This step was not necessary, but it will help us in knowing which end-point we actually want to execute from the client-side. For the time being, we will leave the download operation to return only a successful result and, in the meantime, start with the implementation of the client-side.
That way, we can have a clearer view of what are the potential needs of a user and how to modify the API to fulfill those needs, dotnet core download file. Changing the name to UploadController and adding Route, its end-point has dotnet core download file as well, dotnet core download file, therefore we have to update the code in the upload.
Now try to run the application again and confirm that it is working as if nothing has changed! Since it is running smoothly, we can continue our refactoring journey.
It only helps us push the folders that we use frequently to the top of the project tree so that we can easily locate them. The next step is to move the logic for sending an upload request from the upload. ts to our newly created file.
And then inject the service to call the new method in upload. Now we can make sure once again that everything works as expected. With this, we are concluding the refactoring part and can safely move on to adding a download component to our client-side project. While looking at the file.
tswe can notice that the first part of the URL for both upload and download methods is the same since the FileService is targeting the FileController on the server-side. That said, we can extract it in a separate variable and access it through interpolation:.
After the successful refactoring of the FileService, we will create a component that consumes the service and downloads our file. We will name it, respectfully, dotnet core download file, DownloadComponent, to match the one for upload that we already have.
Angular CLI steps in once more with its command for a component generation:. ng generate component download --skipTests or shorter ng g c download --skipTests. This time we can skip the creation of the folder because the CLI will do that for us. The behavior of the DownloadComponent will follow the general pattern — it will call the FileService, handle the response, and propagate it back to its parent component.
To accomplish that, we have to add logic to the download. ts that makes it happen:. Dotnet core download file this, we can wrap up the implementation of the download operation. To choose a file to download, we first need to list those files somewhere in the application and trigger the download request with the help of the UI components. As mentioned in the beginning, we will load a list of users from the database and take their corresponding profile pictures.
But to have something to show, dotnet core download file, we first need to create some users.
On the homepage of the application, dotnet core download file, by entering credentials and uploading a picture, we can successfully create a User. When we add a user, the profile picture will also automatically appear in a folder inside our application. For the sake of simplicity, we will dotnet core download file them below the user creation form.
Each photo in the list will have an associated download button which will trigger the download for that particular file. For the realization of the idea of iterating through a list of users, we first need to load the users from the database. Luckily, we already have a method in the app. ts that does that for us so we will just call it in the initialization method:.
html under the form, in the first section of the page:. Here, we also added the dotnet core download file for the DownloadComponent so its template renders next to each profile picture. By clicking the download button, we will get a message that we have hit the download end-point:.
With this implementation, we are manipulating the user data that we read from the database, selecting image properties, and showing them. But what if we want to read the files directly from a folder? To be able to read from a folder, we need its path. When we access the desired folder, we pick up the files with specific extensions since we only want pictures. That way we will get paths for each file and render them on the UI as we do now by reading from the database.
Firstly, we are going to add a new end-point to our FileController. We will fill it with the necessary logic for reading. jpeg and. png files from a folder in the solution, dotnet core download file. Note: If the only photos in the folder are the ones associated with users, try to add more files so that there is a clear difference between these two approaches. The updated FileController. cs now contains the new logic for reading the photos:, dotnet core download file.
For using it on the client-side, we need to add the corresponding method to the file. ts as well:. The next step is calling the method in our app. tsby firstly injecting the FileService. Then, the first call of the method will be in the initialization method so that we load the list of photos when we access the home page for the first time. The second call is in the returnToCreate method. Since successful user creation triggers that method, we expect a refreshed list every time we add a new user and its photo.
Lastly, we can delete the unnecessary getUsers call from the initialization method:. By comparing the files in the Images folder and the ones on the UI, we can see that all photos with the desired extension are shown and not only the ones that belonged to users:. Now that we have our files ready on the UI, they are ready for download as well. Stay tuned for the next part. By clicking the download button, we expect that the picture associated with that specific dotnet core download file gets downloaded.
To differentiate which file will be downloaded, we need to send some data to the server. The idea is simple: pass the file URL from the form to the file.
ts and then receive it in the FileController. Passing the URL, we know exactly which file will be downloaded since the URL contains the extension as well. The mentioned implementation requires dotnet core download file in both the client and server parts. On the client part, we are going to extend the download method by passing the URL as a parameter.
Since the DownloadComponent exists separately, we will have to pass the data somehow. It provides us with a possibility to pass any data from the parent to the child component — in this case, from AppComponent to Dotnet core download file. The URL of the file will be passed to the back-end as a query parameter.
Then, respectfully, the download. ts in which the method is called:, dotnet core download file. And finally, pass the desired URL from the app. html :. cs too:. When we pass the URL parameter, we combine it with the directory in which our pictures are saved and read the file from that specific location.
Later on, we copy the content of the file to a stream and return it to the client as a File. What could be worth mentioning is the FileExtensionContentTypeProvider class which helps us get the MIME type of the file in one line of code. And yes, we have to handle the data returned from the API. We are going to do it in a way that downloads the photo automatically. ts file :. The reason why we are manipulating the DOM in this manner is that we want to save the user from doing any more dotnet core download file by downloading the file automatically.
To achieve that, first, we create an anchor element. Then we hook the downloaded BLOB and the URL of the file to its properties. File download is a very common requirement nowadays since we are manipulating hundreds of data every day.
How to download a file in mvc - FileResult in mvc - Advanced MVC 5 concepts
, time: 14:07Dotnet core download file
6/5/ · blogger.com Core MVC model binding provides IFormFile interface to upload one or more files. The HTML form must have the encoding type set to multipart/form-data and an input element with type attribute set to file. You could also upload multiple files by receiving a list of IFormFile in action method and setting input element with multiple attribute 20/11/ · If you already have a controller, add an Action that return PhysicalFile for file on your disc or File for binary file in memeory: [HttpGet] public ActionResult Download (string fileName) { var path = @"c:\blogger.com"; return PhysicalFile (path, "text/plain", fileName); } To file path from project folder inject IHostingEnvironment and get The DownloadFile method downloads to a local file data from the URI specified by in the address parameter. This method blocks while downloading the resource. To download a resource and continue executing while waiting for the server's response, use one of the DownloadFileAsync methods
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