無法加載PDF文檔（MVC）

Question

請幫忙。它顯示「無法加載PDF文檔」。

我沒有找到我在代碼中犯的錯誤。

這是我的代碼：

查看：

<a data-toggle="tooltip" data-placement="top" title="View" href="@Url.Action("DownloadFile", new { id = pat.ID })" target="_blank" class=" btn btn-success btn-sm"> 
<span class="glyphicon glyphicon-file" aria-hidden="true"></span></a> 

控制器：

public FileStreamResult DownloadFile(int id) 
{ 
    MemoryStream workStream = new MemoryStream(); 
    DataModel DB = new DataModel(); 
    /var content = DB._PATIENT.Where(m => m.ID == id).FirstOrDefault(); 
    byte[] contents = (byte[])content.Result; 
    workStream.Write(contents, 0, contents.Length); 
    workStream.Position = 0; 

    Response.AddHeader("Content-Disposition", "inline; filename=someFile.pdf"); 
    return new FileStreamResult(workStream, "application/pdf");  
} 

型號：

public int ID { get; set; } 
public string PatientCode { get; set; } 
public string CaseNo { get; set; } 
public DateTime DatePerformed { get; set; } 
public byte[] Result { get; set; } 
public DateTime ExpirationDate { get; set; } 
public string LaboratoryName { get; set; } 

Answer 1

鑑於content.Result已經是PDF的字節數組，然後只返回字節數組。

public ActionResult DownloadFile(int id) { 
    var DB = new DataModel(); 
    var patient = DB._PATIENT.Where(m => m.ID == id).FirstOrDefault(); 
    if (patient != null && patient.Result != null && patient.Result.Length > 0) { 
     var content = patient.Result; //this is a byte[] of the pdf 
     Response.AddHeader("Content-Disposition", "inline; filename=someFile.pdf"); 
     return File(content, "application/pdf"); 
    } 
    return RedirectToAction("BadPatientFile"); 
} 

Answer 2

可以退換貨FileContentResult而不是FileStreamResult如下，

public ActionResult DownloadFile(int id) 
{ 
    MemoryStream workStream = new MemoryStream(); 
    DataModel DB = new DataModel(); 
    var content = DB._PATIENT.Where(m => m.ID == id).FirstOrDefault(); 
    byte[] contents = (byte[])content.Result; 
    workStream.Write(contents, 0, contents.Length); 
    workStream.Position = 0; 

    Response.AddHeader("Content-Disposition", "inline; filename=someFile.pdf"); 
    return File(workStream, "application/pdf", "someFile.pdf"); 
}