我在apiPdfsharpController中收到错误。我正在打印的报告是从Job类中提取数据。作业类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Job添加了一个ViewModel，但是我不知道是否需要在这里使用它。如果是这样我不知道如何使用它而不是Job Class本身。
异常消息： 对象引用未设置为对象的实例。
堆栈跟踪： at TexasExterior.Controllers.PdfController.Get（Nullable`1 id）位于c：\ Development \ TexasExterior \ TexasExterior \ Controllers \ PdfController.cs：第92行
apiPdfController：
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;
}
}
JobClass
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" />
答案 0 :(得分：0)
问题是您的Job对象具有空Customer属性。更改GetJob函数以检索它：
model = context
.Jobs
.Include("Customer") //This is the important addition
.Where(j => j.JobId == id)
.First();