如何设置PdfSharp控制器

我的apiPdfsharpController中收到一个错误。我正在打印的报告正在从Job类中提取数据。作业类正在从客户类中提取数据。客户类数据是导致异常的原因。我确实为作业添加了ViewModel，但我不知道是否需要在这里使用它。如果是这样的话，我不知道如何使用它来代替作业类本身。

异常消息：对象引用未设置为对象的实例。

StackTrace：在c:''Development''TexasExterior''TexasExternal''Controllers''PdfController.Get（Nullable`1id）中

apiPdf控制器：

 public string Get(int? id) // allow nullable parameter
    {
        if (!id.HasValue) // if null return an empty string
        {
            return string.Empty;
        }
        // your code :
        apiJobController adapter = new apiJobController();
        Job job = new Job();
        job = adapter.GetJob(id);
        if (job == null)
        {
            return string.Empty;
        }
        try
        {
            // Create a new PDF document
            PdfDocument document = new PdfDocument();
            document.Info.Title = "Created with PDFsharp";
            // Create an empty page
            PdfPage page = document.AddPage();
            page.Size = PageSize.Letter;
            // Get an XGraphics object for drawing
            XGraphics gfx = XGraphics.FromPdfPage(page);
            XPen pen = new XPen(XColors.Black, Math.PI);
            //XPdfFontOptions options = new XPdfFontOptions(PdfFontEncoding.Unicode, PdfFontEmbedding.Always);
            // Create a font
            XFont HeadingFont = new XFont("Times New Roman", 20, XFontStyle.Bold);
            XFont BodyFont = new XFont("Times New Roman", 12);
            // Draw the text

            gfx.DrawString("Date : ", BodyFont, XBrushes.Black,
              new XRect(127, 120, page.Width, page.Height),
              XStringFormats.TopLeft);
            gfx.DrawString(job.JobContractDate.ToString(), BodyFont, XBrushes.Black,
              new XRect(160, 120, page.Width, page.Height),
              XStringFormats.TopLeft);
            gfx.DrawString("Job Number : ", BodyFont, XBrushes.Black,
              new XRect(90, 140, page.Width, page.Height),
              XStringFormats.TopLeft);
            gfx.DrawString(job.JobNumber.ToString(), BodyFont, XBrushes.Black,
             new XRect(160, 140, page.Width, page.Height),
             XStringFormats.TopLeft);
            gfx.DrawString("Job Name", BodyFont, XBrushes.Black,
              new XRect(100, 160, page.Width, page.Height),
              XStringFormats.TopLeft);
            gfx.DrawString(job.JobName, BodyFont, XBrushes.Black,
             new XRect(160, 160, page.Width, page.Height),
             XStringFormats.TopLeft);
            gfx.DrawString("Customer : ", BodyFont, XBrushes.Black,
              new XRect(102, 180, page.Width, page.Height),
              XStringFormats.TopLeft);
            gfx.DrawString(job.Customer.CustomerName, BodyFont, XBrushes.Black,
              new XRect(160, 180, page.Width, page.Height),
              XStringFormats.TopLeft);
            gfx.DrawString(job.Customer.CustomerAddress, BodyFont, XBrushes.Black,
              new XRect(160, 195, page.Width, page.Height),
              XStringFormats.TopLeft);
            gfx.DrawString(job.Customer.CustomerCity + job.Customer.CustomerState + job.Customer.CustomerZipcode.ToString(), BodyFont, XBrushes.Black,
              new XRect(160, 210, page.Width, page.Height),
              XStringFormats.TopLeft);


   var dt = DateTime.Now.ToString("f").Replace('/', '-').Replace(':', '-');
            var filename = string.Format("{0}--{1}.pdf", job.JobName, dt);
            string path = Path.Combine(HttpContext.Current.Server.MapPath("~/JobSetupPdfs/"),    Path.GetFileName(filename));
            document.Save(path);
            // ...and start a viewer.
            Process.Start(path);
        }
        catch (Exception ex)
        {
            Debug.Print(ex.ToString());
        }
        return string.Empty;

JobViewModel

public class JobViewModel
{
    public int JobId { get; set; }
    public int JobNumber { get; set; }
    public string JobName { get; set; }
    public string JobDescription { get; set; }
    public int JobOriginalContract { get; set; }
    public DateTime? JobContractDate { get; set; }
    public DateTime? JobBillingDate { get; set; }
    public int JobTotalCO { get; set; }
    public int JobRevisedContract { get; set; }
    public int JobOriginalBudget { get; set; }
    public string JobBillingForm { get; set; }
    public string JobTESPM { get; set; }
    public string JobTESSuperintendent { get; set; }
    public string JobStatus { get; set; }
    public string JobMoreShit { get; set; }
    public bool JobTaxExempt { get; set; }
    public bool JobCertPayroll { get; set; }
    public int JobCost { get; set; }
    public int JobRemainingBudget { get; set; }
    public int JobProfit { get; set; }
    public int JobPercentage { get; set; }
    public int JobTotalBilled { get; set; }
    public int JobBalanceToBill { get; set; }
    public int JobPaidToDate { get; set; }
    public int JobBalanceDue { get; set; }
    public string JobAddress { get; set; }
    public string JobCity { get; set; }
    public string JobState { get; set; }
    public int JobZipcode { get; set; }
    public string JobCounty { get; set; }
    public Int64 JobPhoneNumber { get; set; }
    public Int64 JobFaxNumber { get; set; }
    public bool JobIsHidden { get; set; }
    public int JobRetainage { get; set; }
    public int JobMinWage { get; set; }
    public string JobInsProgram { get; set; }
    public int CustomerId { get; set; }
    //public int? GeoAreaId { get; set; }
    //public int? JobClassId { get; set; }
    //public int? JobTypeId { get; set; }
}

apiJobController

 // GET api/<controller>/5
    public Job GetJob(int? id)
    {
        using (var context = new ApplicationDbContext())
        {
            Job model = new Job();
            model = context.Jobs.Where(j => j.JobId == id).FirstOrDefault();
            return model;
        }
    }

作业类别

  public class Job
{
    public int JobId { get; set; }
    public int JobNumber { get; set; }
    public string JobName { get; set; }
    public string JobDescription { get; set; }
    public int JobOriginalContract { get; set; }
    public DateTime? JobContractDate { get; set; }
    public DateTime? JobBillingDate { get; set; }
    public int JobTotalCO { get; set; }
    public int JobRevisedContract { get; set; }
    public int JobOriginalBudget { get; set; }
    public string JobBillingForm { get; set; }
    public string JobTESPM { get; set; }
    public string JobTESSuperintendent { get; set; }
    public string JobStatus { get; set; }
    public string JobMoreShit { get; set; }
    public bool JobTaxExempt { get; set; }
    public bool JobCertPayroll { get; set; }
    public int JobCost { get; set; }
    public int JobRemainingBudget { get; set; }
    public int JobProfit { get; set; }
    public int JobPercentage { get; set; }
    public int JobTotalBilled { get; set; }
    public int JobBalanceToBill { get; set; }
    public int JobPaidToDate { get; set; }
    public int JobBalanceDue { get; set; }
    public string JobAddress { get; set; }
    public string JobCity { get; set; }
    public string JobState { get; set; }
    public int JobZipcode { get; set; }
    public string JobCounty { get; set; }
    public Int64 JobPhoneNumber { get; set; }
    public Int64 JobFaxNumber { get; set; }
    public bool JobIsHidden { get; set; }
    public int JobRetainage { get; set; }
    public int JobMinWage { get; set; }
    public string JobInsProgram { get; set; }
    public int CustomerId { get; set; }
    public virtual Customer Customer { get; set; }
    //public int? GeoAreaId { get; set; }
    //public virtual GeoArea GeoArea { get; set; }
    //public int? JobClassId { get; set; }
    //public virtual JobClass JobClass { get; set; }
    //public int? JobTypeId { get; set; }
    //public virtual JobType JobType { get; set; }
    public virtual ICollection<ChangeOrder> ChangeOrders { get; set; }
}

更新角度控制器

$scope.EmailPdf = function () {
   var id = $scope.currentItem.JobId
    $http.get('/api/Pdf/' + id).success(function () {
        $scope.PrintPreviewModal();
    });
}

查看

                                    <label>Number:</label>
                                    <input ng-model="currentItem.JobNumber" type="text" name="JobNumber">
                                    <input ng-hide="true" ng-model="currentItem.JobContractDate" type="text" />
                                    <label>Customer:</label>
                                    <input stype="text" ng-model="currentItem.Customer.CustomerName"
                                           typeahead="customer.CustomerName for customer in customerArray | filter:$viewValue"
                                           placeholder="Enter Customer" typeahead-on-select="selectEditCustomer($item)">
                                </div>
                                <div class="inline-fields">
                                    <label>Status:</label>
                                    <select ng-model="currentItem.JobStatus">
                                        <option value="" selected="selected">Select</option>
                                        <option value="Active">Active</option>
                                        <option value="InActive">InActive</option>
                                        <option value="Complete">Complete</option>
                                    </select>
                                    <label>Address:</label>
                                    <input disabled style="width:200px" ng-model="currentItem.Customer.CustomerAddress" type="text">
                                </div>
                                <div class="inline-fields">
                                    <label">Name:</label>
                                    <inputng-model="currentItem.JobName" type="text">
                                    <label>City:</label>
                                    <input disabled style="width: 93px" ng-model="currentItem.Customer.CustomerCity" type="text">
                                    <label>St:</label>
                                    <input disabled style="width: 30px" ng-model="currentItem.Customer.CustomerState" type="text">
                                    <label>Zip:</label>
                                    <input disabled style="width: 44px" ng-model="currentItem.Customer.CustomerZipcode" type="text">
                                </div>
<inputng-click="EmailPdf(currentItem)" type="button" value="Email" />

model = context
            .Jobs
            .Include("Customer") //This is the important addition
            .Where(j => j.JobId == id)
            .First();