Parameters in ASP.NET MVC to create a PDF
Question
I have a particular problem, I am working with ASP.NET MVC in C# and SQL Server. The idea is that on the main screen you see a text box and a button, entering a number that brings us our data. By bringing that data, the person can choose whether they want to see if that data in a PDF. But, when I try to carry out those data to the pdf the problem arises that I will show.
Index:
<div>
<form method="post" action="/Home/ChRoja">
<p>Titulo: <input type="text" name="titulo" /></p>
<p><input type="submit" value="Chequera Roja" /></p>
</form>
</div>
Controller:
public ActionResult Index()
{
return View();
}
public ActionResult ChRoja()
{
ConexionSQL cn = new ConexionSQL();
double titulo = Convert.ToDouble(Request.Form["titulo"].ToString());
return View(cn.cargarDatos(titulo));
}
public ActionResult Pdf()
{
double titulo = Convert.ToDouble(Request.Form["id"].ToString());
return new Rotativa.ActionAsPdf("ChRoja", titulo);
}
ChRoja:
<body style='background: url(/images/CHEQUERAS-ROJAS-CORTA.png) no-repeat center'>
<div>
<form id="form">
<div>
<table back>
@foreach (var item in Model)
{
<tr>
<th scope="row" abbr="Suscriptor">Suscriptor: </th>
<td>
<b>@Html.DisplayFor(modelItem => item.Apellido) @Html.DisplayFor(modelItem => item.Nombre)</b>
</td>
<td>Título: @Html.DisplayFor(modelItem => item.Titulo)</td>
<td>
@Html.ActionLink("Ver detalles en PDF", "Pdf", new { id = item.Titulo })
</td>
</tr>
}
</table>
</div>
</form>
<a href="@Url.Action("Pdf", "Home")">Convertir a Pdf</a>
</div>
</body>
So the problem is that when I press to view the PDF values of the query the following happens:
System.NullReferenceException: 'Referencia a objeto no establecida como instancia de un objeto.'
Any suggestions?
2 answers
solution1
1 ACCPTED 2020-04-14 16:28:55
you are using the wrong constructor for Html.ActionLink. There is an answer here .
Solution for your case is to add a parameter "Home" for the controller's action, as well as null at the end for htmlattributes.
@Html.ActionLink("Ver detalles en PDF", "Pdf", "Home", new { id = item.Titulo }, null)
solution2
0 2020-04-14 14:29:07
Solution: Change this
@Html.ActionLink("Ver detalles en PDF", "Pdf", new { id = item.Titulo })
For this:
@Html.ActionLink("Ver detalles en PDF", "Pdf", new { titulo = item.Titulo })
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