c# - Why is my model and its variables not passing from View to Method inside of my Controller?

Question

My application searches for the files that contains a string the user is looking for. So far it does that perfectly. The last thing I need to do is to export it to an excel file so I added a method inside of my controller that is called by the Result page after I press a button.

The results are stored in a List of type Result which is a class with four variables.

The method ExportToExcel currently returns string so that I can test if the list of results is null. Every single time it has come out as "No Data", therefore it is null. It perfectly prints out a table with the information in the Results page but does not have the information when i want to export it.

Why is my model not passing from view to method?

At first I wanted to pass my model so that I can access the information in the List but now I am wondering if it would be better to save the List data in the controller so that I can directly pass it to my method.

Either way would be fine and I am open to any other ways to do this.

Model

namespace Final.Models
{
    public class InputModel:Result
    {

        public List<Result> Results { get; set; }

    }  
}

Controller

This controller is just showing how I am passing the InputModel between the views and method. Maybe I am doing something wrong here?

        public ActionResult Index()
        {
            var input = new InputModel();
            return View(input);
        }

        [HttpPost]
        public ActionResult Index(InputModel input)
        {
            //Finds files that contain string.
            //send model to Result
            return View("Result", input);
        }

        public ActionResult Result(InputModel input)
        {
            return View(input);
        }

        [HttpPost]
        public string Result(InputModel input,string export)
        {

            return ExportToExcel(input);
        }

        public string ExportToExcel(InputModel input)
        {
            if (input.Results!=null)
            {
                //Run excel code here
              return "Excel Exported";
            }
            else
             {
                 return "No Data";
             }
        }

View for Result

This is part of the view, not the whole thing. I didn't think the full view was necessary but I posted it in the bottom just in case.

 @foreach(var result in Model.Results)
        {

            <tr>
             //Return graph of information received
            </tr>

        }
    </table>

     <form action="Find/Result" method="POST">
           <input type="submit" value="Export" name="export"  class="btn btn-default"> 
     </form>

Output

Occurs after pressing the "Export" Button

"No Data"

This is my first MVC applications so once again please let me know if there is any other area I can improve in.

Full View For Result

Changed the form to enclose the entire view as suggested by Wubbly but I get the same output.

@model Final.Models.InputModel

@{
    ViewBag.Title = "Result";
    Layout = "~/Views/Shared/_Layout.cshtml";
}




    <br />
    <h4>Result</h4>
    <hr />


@using (Html.BeginForm("Result", "Find", FormMethod.Post))
{
    <p>The <b>@Model.SelectedText</b> files that contain <b>"@Model.Find"</b> are:  </p>
    <div>
        <table class="table table-bordered table-responsive table-hover">
            <tr>
                //HEADERS

            </tr>
            @foreach (var result in Model.Results)
            {
                // int i = 1;
                <tr>

                    <td>@result.SelectedText</td>
                    <td>@result.FileName</td>
                    <td>@result.Line</td>
                    <td>@result.LineCode</td>
                </tr>

            }
        </table>

        <div class="form-group">
            <div class="col-md-offset-2 ">

                <input type="submit" value="Export" name="export" class="btn btn-default">


            </div>
        </div>

    </div>
}







    <p>
        @Html.ActionLink("Back to List", "Index")
    </p>

标签： c#asp.netasp.net-mvcmodelcontroller

Answer 1

Use for loop with hidden property which takes your property value to model.

@using (Html.BeginForm("Result", "Find", FormMethod.Post))
 {
<p>The <b>@Model.SelectedText</b> files that contain <b>"@Model.Find"</b> are:  </p>
<div>
    <table class="table table-bordered table-responsive table-hover">
        <tr>
            //HEADERS

        </tr>
        @for (int i = 0; i < Model.Results.Count; i++)
        {
            // int i = 1;
            <tr>
                <td>
                    @Html.HiddenFor(r => r.Model.Results[i].SelectedText)
                    @Html.HiddenFor(r => r.Model.Results[i].FileName)
                    @Html.HiddenFor(r => r.Model.Results[i].Line)
                    @Html.HiddenFor(r => r.Model.Results[i].LineCode)

                    @Html.DisplayFor(r => r.Model.Results[i].SelectedText)
                </td>
                <td>@Html.DisplayFor(r => r.Model.Results[i].FileName)</td>
                <td>@Html.DisplayFor(r => r.Model.Results[i].Line)</td>
                <td>@Html.DisplayFor(r => r.Model.Results[i].LineCode)</td>
            </tr>

        }
    </table>

    <div class="form-group">
        <div class="col-md-offset-2 ">

            <input type="submit" value="Export" name="export" class="btn btn-default">


        </div>
    </div>

</div>
 }
 <p>
   @Html.ActionLink("Back to List", "Index")
 </p>