.net core , .net6,net9,webapi图片上传，多图上传，按照年月来存储图片，按月存储。微信小程序上传图片

代码如下

/// <summary>
/// 图片上传相关服务
/// </summary>
public class ImgController : FABaseApiController
{
    private readonly IWebHostEnvironment _env;
    /// <summary>
    /// 
    /// </summary>
    /// <param name="env"></param>
    public ImgController(IWebHostEnvironment env)
    {
        _env = env;
    }
    /// <summary>
    /// 图片上传
    /// </summary>
    /// <returns></returns>
    [HttpPost]
    public async Task<ObjectResult> UploadImage()
    {
        // 注意requst的获取，这里自己封装了一层BaseApiController所以使用base.HttpContext.Request获取
        // var request = HttpContext.Request;
        var request = HttpContext.Request;
        IFormFileCollection upfiles = request.Form.Files;
        if (upfiles == null || upfiles.Count == 0)
        {
            return Failed("未选择任何文件");
        }
        // 只取第一个文件
        IFormFile firstFile = upfiles.First();
        // 使用注入的_env获取路径
        string uploadDir = Path.Combine(_env.WebRootPath, "imgs", "uploadimgs");
        // 创建月度子目录
        string monthlyFolder = DateTime.Now.ToString("yyyy-MM");
        string fullPath = Path.Combine(uploadDir, monthlyFolder);
        if (!Directory.Exists(fullPath))
        {
            Directory.CreateDirectory(fullPath);
        }
        try
        {
            // 验证文件类型
            var allowedExtensions = new[] { ".jpg", ".jpeg", ".png", ".gif", ".webp" };
            var fileExt = Path.GetExtension(firstFile.FileName).ToLowerInvariant();
            if (firstFile.Length == 0 || !allowedExtensions.Contains(fileExt))
            {
                return Failed("不支持的文件类型或空文件");
            }
            if (firstFile.Length > 10 * 1024 * 1024)
            {
                return Failed("单个文件大小不能超过10MB");
            }
            // 生成唯一文件名
            string fileName = $"{Guid.NewGuid():N}{fileExt}";
            string filePath = Path.Combine(fullPath, fileName);
            // 使用异步写入提高性能
            using (var stream = new FileStream(filePath, FileMode.Create))
            {
                await firstFile.CopyToAsync(stream);
                await stream.FlushAsync();
            }
            // 返回带完整访问路径的结果
            string baseUri = $"{Request.Scheme}://{Request.Host}/imgs/uploadimgs/{monthlyFolder}/";
            string shortBaseUrl = $"/imgs/uploadimgs/{monthlyFolder}/";
            var result = new
            {
                fileName = fileName,
                monthlyFolderName = monthlyFolder,
                fileNameAndFolderName = $"{monthlyFolder}/{fileName}",
                shortFileUrl = shortBaseUrl + fileName,
                fileUrl = baseUri + fileName,
                // size = firstFile.Length
            };
            return Success(result);
        }
        catch (Exception ex)
        {
            // 记录错误日志（建议添加日志记录）
            return Failed($"上传失败: {ex.Message}");
        }
    }
    /// <summary>
    /// 多图上传
    /// </summary>
    /// <returns></returns>
    [HttpPost]
    public async Task<ObjectResult> UploadImageMany()
    {
        // 注意requst的获取，这里自己封装了一层BaseApiController所以使用base.HttpContext.Request获取
        // var request = HttpContext.Request;
        var request = base.HttpContext.Request;
        IFormFileCollection upfiles = request.Form.Files;
        if (upfiles == null || upfiles.Count == 0)
        {
            return Failed("未选择任何文件");
        }
        // 获取安全的物理路径（跨平台兼容）
        string uploadDir = Path.Combine(_env.WebRootPath, "imgs", "uploadimgs");
        // 创建月度子目录
        string monthlyFolder = DateTime.Now.ToString("yyyy-MM");
        string fullPath = Path.Combine(uploadDir, monthlyFolder);
        if (!Directory.Exists(fullPath))
        {
            Directory.CreateDirectory(fullPath);
        }
        List<string> savedFiles = new();
        foreach (IFormFile formFile in upfiles)
        {
            // 验证文件类型
            var allowedExtensions = new[] { ".jpg", ".jpeg", ".png", ".gif", ".webp" };
            var fileExt = Path.GetExtension(formFile.FileName).ToLowerInvariant();
            if (formFile.Length == 0 || !allowedExtensions.Contains(fileExt))
            {
                continue; // 跳过无效文件
            }
            if (formFile.Length > 10 * 1024 * 1024)
            {
                return Failed("单个文件大小不能超过10MB");
            }
            try
            {
                // 生成唯一文件名
                string fileName = $"{Guid.NewGuid():N}{fileExt}";
                string filePath = Path.Combine(fullPath, fileName);
                // 使用异步写入提高性能
                using (var stream = new FileStream(filePath, FileMode.Create))
                {
                    await formFile.CopyToAsync(stream);
                    await stream.FlushAsync();
                }
                savedFiles.Add(fileName);
            }
            catch (Exception ex)
            {
                // 记录错误日志（建议添加日志记录）
                return Failed($"上传失败: {ex.Message}");
            }
        }
        if (savedFiles.Count == 0)
        {
            return Failed("没有有效的图片文件");
        }
        // 返回带完整访问路径的结果（根据实际需求调整）
        string baseUri = $"{Request.Scheme}://{Request.Host}/imgs/uploadimgs/{monthlyFolder}/";
        string shortBaseUrl = $"/imgs/uploadimgs/{monthlyFolder}/";
        var result = savedFiles.Select(f => new
        {
            fileName = f,
            shortFileUrl = shortBaseUrl + f,
            fileUrl = baseUri + f,
        });
        return Success(result);
    }
}

uni-app,微信小程序端调用测试

// 上传清洗前照片
const uploadBeforeImage = () => {
  uni.chooseImage({
    count: 1,
    success: (res) => {
      beforeImages.value.push(res.tempFilePaths[0]);
      console.log("开始上传图了！");
      uploadFile(res.tempFilePaths[0]);
    },
  });
};
const uploadFile = (_filePath:any)=>{
    uni.uploadFile({
        // 请求接口地址
        url: ApiBaseUrl + '/watertap/api/Img/UploadImage', 
        filePath: _filePath,
        name: 'file',
        header: {
            'Authorization': `Bearer ${getToken()}`,
        },
        // 除了图片上传的额外数据
        formData: {
          'bucketName': 'WaterTapCollection',
          'filePath': 'WaterTapCollection',
          'fileType': '1'
        },
        success: (uploadFileRes:any) => {
          // 下面是图片上传成功之后配合其他接口的操作
          // state.UpLoadData.Sign = result.data.id
          // submitUpload()
        }
      });
}