The value providers are the components that gets the value needed from the particular source (query-strings, form etc.) and feed to binders. The model binding feature relies on two types of components binders and value providers. When you perform unit testing, you typically use a derived class to implement members that have customized behavior that fulfills the scenario you are testing.Īs many of us already aware, it's the model binding feature that maps the POSTed file to HttpPostedFileBase in the action parameter. The HttpPostedFileBase class lets you create derived classes that are like the HttpPostedFile class, but that you can customize and that work outside the ASP.NET pipeline. MSDN Says, The HttpPostedFileBase class is an abstract class that contains the same members as the HttpPostedFile class. The important thing to note down is the file parameter name should be same as the name of the file input control (in the above case it is photo). Instead of manually reading the file from the Request, by taking the advantage of model binding the file can be made directly available as a parameter in the action as shown in the below listing. Once you read the POSTed file from the request its really easy to save it to the server. Following are the code snippets of controller action where you can extract file from the Request.
The POSTed files are available in HttpFileCollectionBase of Request.Files.
By default the encoding type is application/x-If you forget setting the proper encoding type then only the filename is submitted not the file. You can write the following code in View.Īn important thing developers forget sometimes is setting the encoding type (enctype) to multipart/form-data. The following are few points to remember. All we need is an html form having encoding type set to multipart/form-data and a file input control. Uploading a file to the server is much simpler than we think. The files in the server can be easily sent as response to the clients through MVC’s rich support of action results The POST’ed file(s) are available as parameters directly in actions through model binding. In this article I gathered the important concepts that are scattered in different posts and threads in a single place. There are already plenty of articles written on this subject. Uploading and Downloading files is a common part of several applications.
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