如何将文件保存到 ASP.NET Core 中的另一个文件夹

Question

I am trying to make an image-saving tactic.我正在尝试制定一种节省图像的策略。 It's simple, the user uploads some images and sends them to a folder on the server's computer.很简单，用户上传一些图像并将它们发送到服务器计算机上的文件夹中。

I took a code to save only one image from the user at a time and tried to make it work with multiple images.我使用代码一次只保存用户的一张图片，并尝试让它与多张图片一起使用。 Here are the results:结果如下：

It still saves only one image.它仍然只保存一张图像。
The image is being saved as a HEX code.图像被保存为十六进制代码。

Here's the code:这是代码：

UploadModel.cs:上传模型.cs：

using Microsoft.AspNetCore.Http;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace SaveImagesTest.Models
{
    public class UploadModel
    {
        public List<string> Name { get; set; }
        public List<IFormFile> File { get; set; }
    }
}

FileUploadController:文件上传控制器：

using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using SaveImagesTest.Models;
using Microsoft.AspNetCore.Hosting;
using System.IO;

namespace SaveImagesTest.Controllers
{
    public class FileUploadController : Controller
    {
        [Obsolete]
        private IHostingEnvironment hostingEnv;

        [Obsolete]
        public FileUploadController(IHostingEnvironment env)
        {
            this.hostingEnv = env;
        }

        [HttpGet]
        public IActionResult Upload()
        {
            return View();
        }

        [HttpPost]
        [Obsolete]
        public IActionResult Upload(UploadModel upload)
        {
            var FileDic = "Files";

            string FilePath = Path.Combine(hostingEnv.WebRootPath, FileDic);

            if (!Directory.Exists(FilePath))
                Directory.CreateDirectory(FilePath);

            int count = 0;

            foreach (var file in upload.File)
            {
                
                var fileName = ++count;
                var filePath = Path.Combine(FilePath, fileName.ToString());

                using (FileStream fs = System.IO.File.Create(filePath))
                {
                    file.CopyTo(fs);
                    continue;
                }
            }

            return View("Index");
        }
    }
}

index.cshtml:索引.cshtml：

@model SaveImagesTest.Models.UploadModel

@{
     Layout = null;
}

<!DOCTYPE html>
<html>
<head>
     <meta name="viewport" content="width=device-width" />
     <title>ASP.NET Core save image to folder </title>
</head>
<body>
     @using (Html.BeginForm("Upload", "FileUpload", FormMethod.Post, new { enctype = "multipart/form-data" }))
     {
         <table>
             <tr>
                 <td>File Upload:</td>
                 <td>
                     <input type="file" id="File_Upload" name="File" onchange="readURL(this);" accept="image/*" multiple />
                     <br />
                 </td>
             </tr>
             <tr>
                 <td>File Name:</td>
                 <td>
                     @Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
                     @Html.ValidationMessageFor(model => model.Name, "", new { @class = "text-danger" })
                 </td>
             </tr>
             <tr>
                 <td></td>
                 <td>
                     <input type="submit" value="Upload" class="btn-default" />
                 </td>
             </tr>
         </table>
     }
 </body>
 </html>

Here's a short summary of what happens: I upload multiple random files, and I see that all of the images are there in the images list.以下是所发生情况的简短摘要：我上传了多个随机文件，我看到所有图像都在图像列表中。 in the Upload function, it's going but saves only the first as HEX.在 Upload function 中，它正在运行，但仅将第一个保存为 HEX。

how the image's being saved图像的保存方式

Answer 1

Using original a file name使用原始文件名

Try to use file name provided by the IFormFile :尝试使用IFormFile提供的文件名：

[HttpPost]
[Obsolete]
public IActionResult Upload(UploadModel upload)
{
    var FileDic = "Files";

    string FilePath = Path.Combine(hostingEnv.WebRootPath, FileDic);

    if (!Directory.Exists(FilePath))
        Directory.CreateDirectory(FilePath);
    
    foreach (var file in upload.File)
    {              
        var filePath = Path.Combine(FilePath, file.FileName);

        using (FileStream fs = System.IO.File.Create(filePath))
        {
            file.CopyTo(fs);
            continue;
        }
    }

    return View("Index");
}

Because of the IFormFile contains file name with the file extension, you will not have problem with opening these.由于IFormFile包含带有文件扩展名的文件名，因此打开这些文件不会有问题。

Using serial numbers for a file name使用序列号作为文件名

If you want to use serial numbers for file name then it's necessary to extract the file extension form the file name provided by the IFormFile interface:如果要使用序列号作为文件名，则需要从IFormFile接口提供的文件名中提取文件扩展名：

[HttpPost]
public IActionResult Upload(UploadModel upload)
{
    var FileDic = "Files";

    string FilePath = Path.Combine(hostingEnv.WebRootPath, FileDic);

    if (!Directory.Exists(FilePath))
        Directory.CreateDirectory(FilePath);

    int count = 0;
    foreach (var file in upload.File)
    {
        var extension = Path.GetExtension(file.FileName);
        var filePath = Path.Combine(FilePath, (++count).ToString()+extension);

        using (FileStream fs = System.IO.File.Create(filePath))
        {
            file.CopyTo(fs);
            continue;
        }
    }
    return View("Index");
}

如何将文件保存到 ASP.NET Core 中的另一个文件夹

问题描述

1 个解决方案

解决方案1
0 2022-09-14 17:29:58

Using original a file name使用原始文件名

Using serial numbers for a file name使用序列号作为文件名

如何将文件保存到 ASP.NET Core 中的另一个文件夹

问题描述

1 个解决方案

解决方案1 0 2022-09-14 17:29:58

Using original a file name使用原始文件名

Using serial numbers for a file name使用序列号作为文件名

解决方案1
0 2022-09-14 17:29:58