Error generating PDF with Rotary

Question

Guys, I’m having a problem here to generate a pdf with the data coming from the bank. My system has a register of students and their occurrences. What I wanted was that, at the time of detailing the data, I could print the data that already comes on the screen (the student’s data and the occurrences related to it), because when detailing a student, it is a specific chosen from the Index (total list of students). Highlighting here, I’m using the Rotativaw7 library, which supports Brazilian special characters !

What happens is that I did everything based on a tutorial that has this link: http://cleytonferrari.com/generatingreports-em-pdf-com-rotary w7/, but I think I’m wrong, causing this error here:
Undefined object reference for an object instance.
In that exact line:
var model = new Student

I’ll put the code I’m using here:

Controller

public ActionResult GeraPDF(long? id)
    {
        Aluno aluno = db
             .Alunos
             .Include(x => x.Ocorrencias)
             .AsNoTracking()
             .FirstOrDefault(f => f.Id == id);

        var pdf = new ViewAsPdf
        {
            ViewName = "GeraPDF",
            Model = modelo,
            PageSize = Size.A4,
            PageMargins = new Margins { Bottom = 2, Left = 2, Right = 2, Top = 2}
        };
        return pdf;
    }

View(used as a base to build the pdf)

@model CEF01.Models.Aluno

         <div>
           <dl class="dl-horizontal">
    <dt>
        @Html.DisplayNameFor(model => model.Nome)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.Nome) <br />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.Foto)
    </dt>

    <dd>
        <img src="@Model.Foto" border="0" width="150px" height="160px" />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.NomePai)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.NomePai)<br />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.NomeMae)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.NomeMae)<br />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.NomeResponsavel)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.NomeResponsavel)<br />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.Endereco)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.Endereco)<br />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.DataDeNascimento)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.DataDeNascimento)<br />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.AnoLetivo)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.AnoLetivo)<br />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.Ano)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.Ano)<br />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.Turma)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.Turma)<br />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.Numero)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.Numero)<br />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.Turno)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.Turno)<br />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.Telefone)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.Telefone)<br />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.TelefoneContato)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.TelefoneContato)<br />
    </dd>

    <dt>
        @Html.DisplayNameFor(model => model.TelefoneResponsavel)
    </dt>

    <dd>
        @Html.DisplayFor(model => model.TelefoneResponsavel)<br />
    </dd>

            </dl>
             </div>

           <br />
          <hr />
                  <h3>Ocorrências</h3>
               <br />
               @Html.Partial("PartialDetalhesOcorrencias", Model.Ocorrencias)

Error when searching for student image: @Html.Displaynamefor(model => model. Photo)

The error happens as soon as I click on the link to display the pdf in the browser to be printed.

I wonder if someone could help me ?

Answer 1

The Rotary bundle7 is no longer active! When to use use the Rotary.

At the time the package did not accept accentuation, then we made a Fork and corrected it! We contacted the author of the Rotary and he accepted our correction, and now the Rotary accepts accentuation!

I wrote an updated post (using Rotary) for the Wild IT community Rotary PDF in ASP . Net MVC

Any questions I’m at your disposal!

Answer 2

I solved the problem. What was happening was that I wasn’t passing the specific student ID, so the object came as null. So to solve the problem, I made the following adaptation:

 @Html.ActionLink("Imprimir", "GeraPDF", new { id = Model.Id})

Explaining: It shows the print word on the link, when clicked it goes in the controller where the Gerapdf action is, and shows the page, searching for the Id of the student who is in Hidden. Simple !

Answer 3

I see no need to assemble the second object. Possibly it is causing the error.

public ActionResult GeraPDF(long? id)
{
    var aluno = db
         .Alunos
         .Include(x => x.Ocorrencias)
         .AsNoTracking()
         .FirstOrDefault(f => f.Id == id);

    if (aluno != null) {
        var pdf = new ViewAsPdf
        {
            ViewName = "GeraPDF",
            Model = aluno,
            PageSize = Size.A4,
            PageMargins = new Margins { Bottom = 2, Left = 2, Right = 2, Top = 2}
        };

        return pdf;
    } else {
        // levantar erro
    }
}

EDIT

I don’t know what mistake you made, but this statement

@Html.DisplayNameFor(model => model.Foto)

Ask that you have in Model the following:

[Display(Name = "Foto")]
public String Foto { get; set; }