[英]Error trying to download Crystal Report PDF
我正在嘗試為我的項目實施Crystal Reports
我的家庭控制器:
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Biblioteca.Models;
using CrystalDecisions.CrystalReports.Engine;
namespace Biblioteca.Controllers
{
public class HomeController : Controller
{
private BibliotecaDatabase db = new BibliotecaDatabase();
public ActionResult Index()
{
var totalesviewmodel = new TotalesViewModel();
totalesviewmodel.MontoCopias = db.AlumnosList.Sum(o => o.Copias);
totalesviewmodel.MontoImpresiones = db.AlumnosList.Sum(o => o.Impresiones);
totalesviewmodel.DineroDeposito = db.AlumnosList.Sum(o => o.Deposito);
totalesviewmodel.DineroSap = db.AlumnosList.Sum(o => o.Sap);
totalesviewmodel.MontoCopiasMaestro = db.MaestrosList.Sum(o => o.Copias);
totalesviewmodel.MontoImpresionesMaestro = db.MaestrosList.Sum(o => o.Impresiones);
return View(totalesviewmodel);
}
public ActionResult Reports()
{
List<Alumno> allDatos = new List<Alumno>();
using (BibliotecaEntities dc = new BibliotecaEntities())
{
allDatos = dc.Alumnos.ToList();
}
return View(allDatos);
}
public ActionResult ExportReport()
{
List<Alumno> allDatos = new List<Alumno>();
using (BibliotecaEntities dc = new BibliotecaEntities())
{
allDatos = dc.Alumnos.ToList();
}
ReportDocument rd = new ReportDocument();
rd.Load(Path.Combine(Server.MapPath("~/Reports"), "rpt_datos.rpt"));
rd.SetDataSource(allDatos);
Response.Buffer = false;
Response.ClearContent();
Response.ClearHeaders();
try
{
Stream stream = rd.ExportToStream(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat);
stream.Seek(0, SeekOrigin.Begin);
return File(stream, "application/pdf", "DatoList.pdf");
}
catch (Exception ex)
{
throw;
}
}
public ActionResult Contact ()
{
ViewBag.Message = "Your contact page.";
return View();
}
}
}
當我嘗試下載報告的PDF文件時,我的項目在以下位置停止:
rd.SetDataSource(allDatos);
出現此錯誤:
mscorlib.dll中發生類型'System.Reflection.TargetInvocationException'的異常,但未在用戶代碼中處理
當我單擊繼續時,瀏覽器會顯示:
ObjectContext實例已被處置,不能再用於需要連接的操作。
我究竟做錯了什么?
這是因為您是在功能代碼塊的using
范圍之外編寫此代碼的:
rd.SetDataSource(allDatos);
嘗試將這些代碼行寫入using
代碼塊中,或者如果這不是問題,則可以刪除using
。
希望這可以幫助。
omg,非常感謝,您為我提供了很多幫助!...答案:像這樣在代碼的最后關閉使用block:
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Biblioteca.Models;
using CrystalDecisions.CrystalReports.Engine;
namespace Biblioteca.Controllers
{
public class HomeController : Controller
{
private BibliotecaDatabase db = new BibliotecaDatabase();
public ActionResult Index()
{
var totalesviewmodel = new TotalesViewModel();
totalesviewmodel.MontoCopias = db.AlumnosList.Sum(o => o.Copias);
totalesviewmodel.MontoImpresiones = db.AlumnosList.Sum(o => o.Impresiones);
totalesviewmodel.DineroDeposito = db.AlumnosList.Sum(o => o.Deposito);
totalesviewmodel.DineroSap = db.AlumnosList.Sum(o => o.Sap);
totalesviewmodel.MontoCopiasMaestro = db.MaestrosList.Sum(o => o.Copias);
totalesviewmodel.MontoImpresionesMaestro = db.MaestrosList.Sum(o => o.Impresiones);
return View(totalesviewmodel);
}
public ActionResult Reports()
{
List<Alumno> allDatos = new List<Alumno>();
using (BibliotecaEntities dc = new BibliotecaEntities())
{
allDatos = dc.Alumnos.ToList();
}
return View(allDatos);
}
public ActionResult ExportReport()
{
List<Alumno> allDatos = new List<Alumno>();
using (BibliotecaEntities dc = new BibliotecaEntities())
{
allDatos = dc.Alumnos.ToList();
ReportDocument rd = new ReportDocument();
rd.Load(Path.Combine(Server.MapPath("~/Reports"), "rpt_datos.rpt"));
rd.SetDataSource(allDatos);
Response.Buffer = false;
Response.ClearContent();
Response.ClearHeaders();
try
{
Stream stream = rd.ExportToStream(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat);
stream.Seek(0, SeekOrigin.Begin);
return File(stream, "application/pdf", "DatoList.pdf");
}
catch (Exception ex)
{
throw;
}
}
public ActionResult Contact ()
{
ViewBag.Message = "Your contact page.";
return View();
}
}
}
}
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