ly/Controllers/UploadController.cs

using LY.App.Model;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace LY.App.Controllers
{
    [Route("api/[controller]/[action]")]
    public class UploadController : Controller
    {

        public static readonly string uploadPath = "upload";

        [HttpPost("uploadImg")]
        public async Task<IActionResult> UploadImg()
        {
            ApiResult result = new ApiResult();
            result.code = 1;
            if (!Request.HasFormContentType)
            {
                return BadRequest("未选择文件");
            }

            IFormFileCollection cols = Request.Form.Files;
            if (cols.Count == 0)
                return BadRequest("上传失败");
            const string fileFilt = ".gif|.jpg|.jpeg|.png|.bmp";
            foreach (IFormFile file in cols)
            {
                var fileExtension = Path.GetExtension(file.FileName);

                if (fileFilt.IndexOf(fileExtension.ToLower(), StringComparison.Ordinal) <= -1)
                {
                    result.msg = "上传的文件格式不正确";
                    return Ok(result);
                }

                long length = file.Length;
                if (length > 1024 * 1024 * 5)
                {
                    result.msg = "上传的文件不能大于5M";
                    return Ok(result);
                }

                var strDateTime = DateTime.Now.ToString("yyMMddhhmmssfff");
                var strRan = Convert.ToString(new Random().Next(100, 999));
                var fileName = strDateTime + strRan + fileExtension;
                string path = Path.Combine(Path.Combine(Directory.GetCurrentDirectory(), "Img"));
                if (!Directory.Exists(path))
                {
                    Directory.CreateDirectory(path);
                }
                var filePath = Path.Combine(path, fileName);

                using (var stream = new FileStream(filePath, FileMode.Create))
                {
                    file.CopyTo(stream);
                }
                result.data = $"/{uploadPath}/{fileName}";
                result.code = 0;
                return Ok(result);
            }

            return BadRequest("上传失败");

        }
    }
}