Pass IEnumerable<Object> to Controller Method

Question

Hi All

I have a page that has a model of IEnumerable<Object>.
I can display the data fine, but would like the function to download that list into a CSV.

I have the method that generates a CSV and downloads it to the device, however I'm having issues with passing the IEnumerable into the Method.

I'm trying to use @URL .Action to try and pass the parameter through, but am having issues with it.

My Method is

public FileContentResult ExportToCSV(IEnumerable<Object> objectList)
{
// Export to CSV Code...
}

I've tried finding other sources to help but can't seem to get it working, is Url.Action even the method I should be using?

Answer 1

Hi @Adrian N ,

To pass a List of objects to the controller, you could use the following methods:

1. Use asp.net core Model Binding and Submit button to submit the form. For example: submit list of questions to the controller: QuestionIndex.cshtml (you could change the action name, object name or request url to yours)

       @model List<WebApplication6.Models.Question>  
   
       <form asp-action="QuestionIndex" id="mainform" method="POST">  
           @for (var i = 0; i < Model.Count(); i++)  
           {  
               <div>@Model[i].QuestionTitle</div>  
               <input asp-for="@Model[i].QuestionId" type="hidden" />  
               <input asp-for="@Model[i].QuestionTitle" type="hidden" />  
               <input asp-for="@Model[i].QuestionAnswer" />  
               <br />  
           }  
           <input type="submit" class="btn btn-primary" value="Submit">     
       </form>   
   

   Controller:

       [HttpPost]  
       public IActionResult QuestionIndex(IEnumerable<Question> questions)  
       {   
           //do something  
           return View(_context.Questions.ToList());  
       }  
   

2. Using JQuery Ajax submits the form data or an array of JavaScript objects to the controller. For example: add a button in the above index page, then, in the button click event, use Ajax method to submit the form to the controller. Comment: Here I use a screenshot to show the code, because I tried to post the sample code, but it disappears when preview.

The screenshot like this:

More detail information, you could refer my reply in this thread.

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Best Regards,
Dillion