感谢https://www.youtube.com/watch?v=ungZ-BaVvZk&ab_channel=ThumbIKR-ProgrammingExamples的教程。

Net.Core Webapi 文件上传接口

Net版本 5.0

Controller设置

Controller文件夹，ImageUploadController.cs文件，这里为了简化操作，将Model文件里面的 FileUploadAPI也移到里面了。

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

namespace FileUploadStudy.Controllers
{
    [Route("api/[Controller]")]
    [ApiController]
    public class ImageUploadController : ControllerBase
    {
        //初始化 
        public static IWebHostEnvironment _environment;
        public ImageUploadController(IWebHostEnvironment environment)
        {
            _environment = environment;
        }

        public class FileUploadAPI
        {
            public IFormFile files { get; set; }

        }
        [HttpPost]
        public async Task<string> Post([FromForm]FileUploadAPI objFile)
        {
            try
            {
                if (objFile.files.Length > 0)
                {
                    string path = _environment.WebRootPath + "\\Upload\\";
                    if (!Directory.Exists(path))
                    {
                        Directory.CreateDirectory(path);
                    }
                    using (FileStream filesStream= System.IO.File.Create(path + objFile.files.FileName))
                    {
                        objFile.files.CopyTo(filesStream);
                        filesStream.Flush();
                        return "\\Upload\\" + objFile.files.FileName;
                    }
                }
                else
                {
                    return "false";
                }
            }
            catch (Exception ex)
            {

                return ex.Message;
            }


        }
    }
}

start.cs设置

start.cs文件的configure里面，主要改了三个部分

app.Run(async (context) =>
            {
                await context.Response.WriteAsync("文件不存在");
            });

app.UseStaticFiles();

if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseSwagger();
                app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "FileUploadStudy v1"));
            }
            /// ---
            else
            {
                app.UseHsts();
            }

wwwroot

还有就是需要新建 wwwroot文件夹

测试

注意关掉postman里面的ssl设置

文件上传接口做起来简单，但要注意几个细节，不然后面会浪费很多时间

• Post接口需要加上[FromForm]特性。不然postman测试会出现411，并且默认的Swagger接口测试也没有文件上传选项
• 注意key的值要与model的FileUploadAPI的files要对应上，不然也会报错