会议成为控制器方法无效 [英] session become null in controller method

问题描述

我有如下控制器，该控制器我创建的会话保存的IEnumerable 数据集

  [HttpPost]
    [ValidateInput（假）]
    公众的ActionResult Create_Brochure（IEnumerable的＆LT; ProductsPropertiesVM＆GT;模型）
    {        IEnumerable的＆LT; ProductsPropertiesVM＆GT; = newModel，并向模型;        IEnumerable的＆LT; BrochureTemplateProperties＆GT;样品= model.Where .....        会话[TemplateData] = newModel，并向;        返回查看（样品）;
    }
 

---

编辑：

Create_Brchure查看页面有链接的href叫 PrintIndex 方法，同一个类文件

 ＆LT; A HREF =@ Url.Action（PrintIndex，招生简章）＆GT;下载ViewAsPdf＆LT; / A＆GT;
 

这是 PrintIndex 法

 公众的ActionResult PrintIndex（）
    {
        返回新Rotativa.ActionAsPdf（Create_Brochure_PDF）{文件名=TestActionAsPdf.pdf};
    }
 

---

我想在 Create_Brochure_PDF 控制器方法再次使用会话列表数据集，所以我创建了这里的方法

 公众的ActionResult Create_Brochure_PDF（）
    {
        IEnumerable的＆LT; ProductsPropertiesVM＆GT; = newModel，并向会话[TemplateData]为IEnumerable＆LT; ProductsPropertiesVM取代;        IEnumerable的＆LT; BrochureTemplateProperties＆GT; samplePDF = newmodel.Where（....        返回查看（samplePDF）;
    }
 

但在上面的方法我越来越空的IEnumerable＆LT; ProductsPropertiesVM＆GT; newModel，并向

编辑：

如果我解释这整个场景

1. Create_Brochure 控制器方法有一个观点，


2. 在这个观点我HREF链接到 Create_Brochure 视图保存为
   PDF


3. 当我点击链接的href我打电话 PrintIndex 方法，以便在
   这一行动再次方法调用它以 Create_Brochure_PDF 方法，
   所以我得到的 Create_Brochure_PDF 设置空对象

解决方案

我有同样的问题，有时前，所以我想出了解决办法 ViewasPdf（）方法Rotativa库

您可以直接打电话到，一旦你点击链接的href，但你必须创建这个方法，你要生成PDF格式视图

所以这里的步骤

1. 创建您要生成PDF格式的查看一个动作

    公众的ActionResult Create_Brochure_PDF（）
   {    IEnumerable的＆LT; ProductsPropertiesVM＆GT; = newModel，并向会话[TemplateData]为IEnumerable＆LT; ProductsPropertiesVM取代;    IEnumerable的＆LT; BrochureTemplateProperties＆GT; samplePDF = newmodel.Where（....    退还或者拒不查看（）;
    

   }




2. 生成视图，而且动作方法




3. 替换该行退还或者拒不查看（）; 与 Create_Brochure_PDF以下行（）法

返回新Rotativa.ViewAsPdf（Create_Brochure_PDF）{文件名=TestActionAsPdf.pdf};

<醇开始=4>

现在，调用 Create_Brochure_PDF（）方法如下中
Create_Brochure视图页

＆LT; A HREF =@ Url.Action（Create_Brochure_PDF，招生简章）＆GT;下载ViewAsPdf＆LT; / A＆GT;

I have following controller , in that controller I created session to save IENUMERABLE data-set

    [HttpPost]
    [ValidateInput(false)]
    public ActionResult Create_Brochure(IEnumerable<ProductsPropertiesVM> model)
    {

        IEnumerable<ProductsPropertiesVM> newmodel = model;

        IEnumerable<BrochureTemplateProperties> sample = model.Where.....

        Session["TemplateData"] = newmodel;

        return View(sample);
    }

---

EDIT:

Create_Brchure View page has href link to call PrintIndex method in same class file

<a href="@Url.Action("PrintIndex", "Brochure")">Download ViewAsPdf</a>

this is PrintIndex method

    public ActionResult PrintIndex()
    {
        return new Rotativa.ActionAsPdf("Create_Brochure_PDF") { FileName = "TestActionAsPdf.pdf" };
    }

---

I want to use that session list dataset again in Create_Brochure_PDF controller method,so I created here that method

    public ActionResult Create_Brochure_PDF()
    {
        IEnumerable<ProductsPropertiesVM> newmodel = Session["TemplateData"] as IEnumerable<ProductsPropertiesVM>;

        IEnumerable<BrochureTemplateProperties> samplePDF = newmodel.Where(....

        return View(samplePDF);
    }

but in above method I'm getting null IEnumerable<ProductsPropertiesVM> newmodel

EDIT:

If I explain this whole scenario

1. Create_Brochure controller method has a view ,
2. In that view I have href link to save that Create_Brochure view as PDF
3. Once I click that href link I'm calling PrintIndex method so in that action method again its calling to Create_Brochure_PDF method , so I'm getting null object set in Create_Brochure_PDF

解决方案

I had the same issue some times ago, So I came up with solution ViewasPdf() method in Rotativa library

You can directly call to once You click that href link but you have to create a View for this method that your going to generate as PDF

So here the steps

1. Create a Action for the View that your Going to Generate as PDF

   public ActionResult Create_Brochure_PDF()
   {
   
       IEnumerable<ProductsPropertiesVM> newmodel = Session["TemplateData"] as IEnumerable<ProductsPropertiesVM>;
   
       IEnumerable<BrochureTemplateProperties> samplePDF = newmodel.Where(.... 
   
       rerurn View();
   

   }

2. Generate view for that Action method

3. Replace this line rerurn View(); with following line in Create_Brochure_PDF() method

return new Rotativa.ViewAsPdf("Create_Brochure_PDF") { FileName = "TestActionAsPdf.pdf" };

4. Now call the Create_Brochure_PDF() method as follows in Create_Brochure view page

<a href="@Url.Action("Create_Brochure_PDF", "Brochure")">Download ViewAsPdf</a>

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