我正在创建使用Entity框架的MVC应用程序。最后想要创建文件上传和查看。我有控制器项目控制器文件上传
public async Task<ActionResult> FileManager(int ProjectId = 0)
{
ReadCookieValue cookie = new ReadCookieValue();
clientId = cookie.readuserinfo().ClientId;
userId = cookie.readuserinfo().Id;
roleId = cookie.readuserinfo().RoleId;
var model = await _project.FilesList(ProjectId, clientId);
return View(model);
}
public async Task<ActionResult> FileUpload(int ProjectId = 0)
{
return View(ProjectId);
}
[HttpPost]
public async Task<ActionResult> FileUploadHandler(int ProjectId = 0)
{
ReadCookieValue cookie = new ReadCookieValue();
clientId = cookie.readuserinfo().ClientId;
userId = cookie.readuserinfo().Id;
roleId = cookie.readuserinfo().RoleId;
if (ProjectId != 0)
{
foreach (var fileKey in Request.Files.AllKeys)
{
ProjectFileModel model = null;
var file = Request.Files[fileKey];
try
{
if (file != null)
{
model = new ProjectFileModel();
var fileName = Path.GetFileName(file.FileName);
var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), clientId.ToString(), ProjectId.ToString());
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
var path1 = Path.Combine(path, fileName);
model.ProjectId = ProjectId;
model.FileName = fileName;
model.FilePath = path;
model.UploadedBy = User.Identity.Name;
model.UploadedDate = DateTime.UtcNow;
model.ClientId = clientId;
var result = await _project.UploadFiles(model);
file.SaveAs(path1);
}
}
catch (Exception ex)
{
return Json(new { Message = "Error in saving file" });
}
}
}
else
{
return Json(new { Message = "Please Select Project" });
}
return Json(new { Message = "File saved" });
}
我创建项目后，我有查看按钮打开上传文件。点击查看按钮我收到错误
{"Object reference not set to an instance of an object."}
Inner Exception null
实际上我正在使用Entity框架模型并使用自己的模型。
文件上传代码
<div class="ibox-content">
<ng-form id="my-awesome-dropzone" class="dropzone" action="@Url.Action("FileUploadHandler", "Projects")" method="post" enctype="multipart/form-data">
<div class="dropzone-previews"></div>
<button type="submit" class="btn btn-primary pull-right">Submit this form!</button>
</ng-form>
</div>
这里使用FileUploadHandler控制器Action.Here FileuploadHandler代码
public async Task<ActionResult> FileUploadHandler(int ProjectId = 0)
{
ReadCookieValue cookie = new ReadCookieValue();
clientId = cookie.readuserinfo().ClientId;
userId = cookie.readuserinfo().Id;
roleId = cookie.readuserinfo().RoleId;
if (ProjectId != 0)
{
foreach (var fileKey in Request.Files.AllKeys)
{
ProjectFileModel model = null;
var file = Request.Files[fileKey];
try
{
if (file != null)
{
model = new ProjectFileModel();
var fileName = Path.GetFileName(file.FileName);
var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), clientId.ToString(), ProjectId.ToString());
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
var path1 = Path.Combine(path, fileName);
model.ProjectId = ProjectId;
model.FileName = fileName;
model.FilePath = path;
model.UploadedBy = User.Identity.Name;
model.UploadedDate = DateTime.UtcNow;
model.ClientId = clientId;
var result = await _project.UploadFiles(model);
file.SaveAs(path1);
}
}
catch (Exception ex)
{
return Json(new { Message = "Error in saving file" });
}
}
}
else
{
return Json(new { Message = "Please Select Project" });
}
return Json(new { Message = "File saved" });
}
以前此代码使用实体框架开发。在采用这个创建的实体框架模型后，我已经看到了两个模型类型的类我可以在模型文件夹和
下看到edmx namespace Inspinia_MVC5.Entityframework
{
using System;
public partial class ProjectsList_Result
{
public int ProjectId { get; set; }
public string ProjectName { get; set; }
public Nullable<System.DateTime> StartDate { get; set; }
public Nullable<System.DateTime> EndDate { get; set; }
public Nullable<bool> IsActive { get; set; }
public Nullable<System.DateTime> CreatedDate { get; set; }
public string CreatedBy { get; set; }
public Nullable<System.DateTime> UpdatedDate { get; set; }
public string UpdatedBy { get; set; }
public int ClientId { get; set; }
public string Employees { get; set; }
public bool IsAnalyticsStart { get; set; }
public bool IsAnalyticsEnd { get; set; }
public string ReportType { get; set; }
}
}
我在实体框架内部遵循先前的方法，没有实体框架模型类型
namespace Inspinia_MVC5.Models
{
public class ProjectsModel
{
public int ProjectId { get; set; }
public string ProjectName { get; set; }
[DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:MM/dd/yyyy}")]
public DateTime StartDate { get; set; } = DateTime.Now;
[DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:MM/dd/yyyy}")]
public DateTime EndDate { get; set; } = DateTime.Now;
public bool IsActive { get; set; }
public DateTime CreatedDate { get; set; }
public string CreatedBy { get; set; }
public DateTime UpdatedDate { get; set; }
public string UpdatedBy { get; set; }
public int ClientId { get; set; }
public List<LoginModelViewModel> AllEmployees { get; set; }
public string Employees { get; set; }
public bool IsAnalyticsStart { get; set; }
public bool IsAnalyticsEnd { get; set; }
public List<ReportType> reportTypes { get; set; }
public string ReportType { get; set; }
public string Designation { get; set; }
}
}
在我的解决方案文件夹中，我看到了App_start/Uploads/1/1。当我运行代码获取错误
{"Object reference not set to an instance of an object."}
Inner Exception null
答案 0 :(得分：-1)
文件上传： - 我正在向您展示如何编写上传文件的代码
假设我在视频表中上传文件并使用PostVideo Model
[HttpPost]
public ActionResult PostAVideo(PostVideo model, HttpPostedFileBase file)
{
if (ModelState.IsValid && file.ContentLength > 0)
{
string filePath = "/Uploads/" + WebSecurity.CurrentUserName + "/" + model.Category;
if (!Directory.Exists(Server.MapPath(filePath)))
{
Directory.CreateDirectory(Server.MapPath(filePath));
}
var fileName = Path.GetFileName(file.FileName);
var path = Path.Combine(Server.MapPath(filePath), fileName);
file.SaveAs(path);
Video _model = new Video();
_model.Title = model.Title;
_model.Path = filePath + "/" + fileName;
_model.Keyword = model.Keyword;
_model.Description = model.Description;
_model.Categories = model.Category;
_model.CreatedDate = model.CreatedDate;
_model.UserName = User.Identity.Name;
_model.UserId = WebSecurity.CurrentUserId;
_model.Name = fileName;
_model.IsDownload = model.IsDownload;
_model.IsCommented = model.IsComment;
_model.Poster = WebSecurity.CurrentUserName;
db.Video.Add(_model);
db.SaveChanges();
ModelState.Clear();
}
return View();
}