在Asp.Net Core中上传图片? [英] Upload Image in Asp.Net Core?
本文介绍了在Asp.Net Core中上传图片?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想在"wwwroot/uploads/img"文件夹中上传图片,但出现错误.我编写了以下代码:
I want to upload image in "wwwroot/uploads/img" folder but i get error.I wrote the following code:
创建视图:
@model imageuploader.Models.Employee
<form method="post" enctype="multipart/form-data" asp-controller="Employee" asp-action="Create">
<div class="form-group">
<div class="col-md-10">
<input asp-for="FirstName" class="form-control" />
</div>
</div>
<div class="form-group">
<div class="col-md-10">
<input asp-for="LastName" Class="form-control" />
</div>
</div>
<div class="form-group">
<div class="col-md-10">
<input asp-for="ImageName" type="file" Class="form-control" />
</div>
</div>
<div class="form-group">
<div class="col-md-10">
<input type="submit" value="Create" />
</div>
</div>
型号:
public class Employee
{
[Key]
public int ID { get; set; }
[Required]
public string FirstName { get; set; }
[Required]
public string LastName { get; set; }
public string ImageName { get; set; }
}
控制器
private readonly RegisterDBContext _context;
private readonly IHostingEnvironment _appEnvironment;
public EmployeeController(RegisterDBContext context, IHostingEnvironment appEnvironment)
{
_context = context;
_appEnvironment = appEnvironment;
}
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create(Employee emp)
{
if (ModelState.IsValid)
{
var files = HttpContext.Request.Form.Files;
foreach (var Image in files)
{
if (Image != null && Image.Length > 0)
{
var file = Image;
//There is an error here
var uploads = Path.Combine(_appEnvironment.WebRootPath, "uploads\\img");
if (file.Length > 0)
{
var fileName = Guid.NewGuid().ToString().Replace("-", "") + Path.GetExtension(file.FileName);
using (var fileStream = new FileStream(Path.Combine(uploads, fileName), FileMode.Create))
{
await file.CopyToAsync(fileStream);
emp.BookPic = fileName;
}
}
}
}
_context.Add(emp);
await _context.SaveChangesAsync();
return RedirectToAction("Index");
}
else
{
var errors = ModelState.Values.SelectMany(v => v.Errors);
}
return View(emp);
}
当我单击提交"按钮时出现错误(标记为错误行),如何在指定的路径上上传图像或文件?
When i click on submit button i get an error (error line is marked), how can i upload image or file in Specified path?
错误:
NullReferenceException: Object reference not set to an instance of an object.
imageuploader.Controllers.EmployeeController+<Create>d__2.MoveNext() in EmployeeController.cs
var uploads = Path.Combine(_appEnvironmen.WebRootPath, "uploads\\img\\");
如何在指定路径中正确上传图像?
How can i upload image correctly in Specified path?
推荐答案
我解决了它.我了解我最初的情况
I Solved it. I understood i initial bad
_appEnvironment
_appEnvironment
在构造函数中. 反复修改后,所有相关代码当前都是正确的.
in Constructor. With repeated edits, all of the codes in question are currently correct.
感谢@Shyju用户.
Thanks @Shyju user.
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