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Passing model data from view to controller and using its values

I am trying to send data from a view and use it in a controller to generate a filename for a file upload function that I am working on, my code is below.

controller

    // GET: File
    [Authorize(Roles = "Admin, Lecturer")]
    public ActionResult Index()
    {



        foreach (string upload in Request.Files)
        {
            if (Request.Files[upload].FileName != "")
            {
                string path = AppDomain.CurrentDomain.BaseDirectory + "/App_Data/uploads/";
                string filename = Path.GetFileName(Request.Files[upload].FileName);
                Request.Files[upload].SaveAs(Path.Combine(path, filename));
            }
        }
        return View();
    }

Model

public class UploadModel
{
    [Required(ErrorMessage = "Course is required")]
    public string Course { get; set; }
    [Required(ErrorMessage = "Title is required")]
    public string Title { get; set; }

    public string Uploader { get; set; }
}

View

<div class="uploadContainer">
    <table>


        <tr>
            <td>Title :</td>
            <td colspan="2" class="editPostTitle">
                @Html.TextBoxFor(tuple => tuple.Item1.Title, new { @class = "uploadTitleInp" })
                @Html.ValidationMessageFor(tuple => tuple.Item1.Title)
            </td>
        </tr>

        <tr>
            <td>Course :</td>
            <td>
                @{
                    List<SelectListItem> listItems = new List<SelectListItem>();
                    foreach (var cat in courses)
                    {
                        listItems.Add(new SelectListItem
                        {
                            Text = cat.Course.Name,
                            Value = cat.Course.Name
                        });
                    }
                }

                @Html.DropDownListFor(tuple => tuple.Item1.Course, listItems, "-- Select Status --")

                @Html.ValidationMessageFor(tuple => tuple.Item1.Course)
            </td>
        </tr>

        <tr>
            <td>File :</td>
            <td>
                <input type="file" name="FileUpload1" id="fileUpload" required />
            </td>
        </tr>

        <tr>
            <td></td>
            <td>
                <input id="btnUploadFile" type="button" value="Upload File" />
            </td>
        </tr>

    </table>

</div>

This method is responsible for placing the file uploaded to the directory. What I want to do is create a filename by doing something like this.

string filename = model.Title + " - " + model.Course;

I usually know how to achieve this when using the db to store the data, but since I don't store the files loaded in the db, then I really don't know how to pass the model data to the controller so that I can use the values ​​entered by the user to generate the file name. I am relatively new to this framework and languages, so any help and pointers would be greatly appreciated.

Thanks in advance!

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2 answers


You need to pass data back through your model to a separate controller method. This can be implemented as follows (I've simplified your code a bit, but the general implementation should work):

public class UploadViewModel
{    
    public string Course { get; set; }
    public string Title { get; set; }
}

Your GET action:

public ActionResult Index()
{
    return View(new UploadViewModel());
}


Then, in your opinion, add the model and use it on the form so that the data is bound to your model. This can then be sent back to your controller.

@model UploadViewModel
@using(Html.BeginForm())
{
    Course: @Html.TextBoxFor(s=>s.Course)
    Title: @Html.TextBoxFor(s=>s.Title)
    <input type="submit" value="Save file" />
}

Now get the values ​​through the HttpPost action method in your controller:

[HttpPost]
public ActionResult Index(UploadViewModel model)
{
    //You can use model.Course and model.Title values now
}
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There are two ways to send data controller

. You must match the data sent toController method

Using the Ajax Post method:

A portable javascript object will be created. the object object name must match the model property name.

var objAjax = new Object();
     objAjax.Course = 'newCourse'; // Model prop is string type so this value must be string.
     objAjax.Title  = 'newTitle';  

   $.ajax('@Url.Action("MethodName", "ControllerName")', {
                type: 'POST',
                data: JSON.stringify(objAjax),
                contentType: "application/json",
                datatype: "json",
                traditional: true,
                success: function (returnData) {
                    // Do something when get success
                },
                error: function () {
                   // Do something when get an error
                }
            });



    [HttpPost]
    public ActionResult Index(UploadViewModel model)
    {
        //do someting
    }


Using the FormPost method

Html.BeginFom

send all data in the model to the controller when the submit button is clicked

Forexample

@using(Html.BeginForm())
{
    <div>
         // Your code 

        <div>
            <input type="submit" value="Go" />
        </div>
    </div>
}


[HttpPost]
public ActionResult Index(UploadViewModel model)
{
    //do someting
}
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