在引用官方的qiniu.core的nuget是总是发生错误，错误如下，所以就在网上找到了一种解决方案，并稍微改进了一番，
以下是引用图：
第一步：引用nuget（是位大神写的，官方的qiniu.core用不了）
第二部：新建项目新建控制器视图、添加配置信息类和读取配置信息
配置信息类：
public class QnySetting ???{ ???????public string qiniuyunAK { get; set; } ???????public string qiniuyunSK { get; set; } ???????public string qiniuyunBucket { get; set; } ???????public string prefixPath { get; set; } ???} 配置信息：
"Qny": { ???"qiniuyunAK": "*",//ak ???"qiniuyunSK": "*",//sk ???"qiniuyunBucket": "**",存储空间名称 ???"prefixPath": "http://upload.qiniup.com"//七牛云地址 ?}
读取配置信息（在startup文件中的ConfigureServices添加）：
?services.Configure<QnySetting>(this.Configuration.GetSection("Qny"));
第三步：复制控制器及视图代码
视图代码：
<form method="post" action="/Upload/UploadQiniu" enctype="multipart/form-data"> ???????<input name="file" type="file" /> ???????<input type="submit" value="提交" /> ???</form>
控制器代码：
?private readonly QnySetting _Qny; ???????public UploadController(IOptions<QnySetting> Qny) ???????{ ???????????_Qny = Qny.Value; ???????} ???????public IActionResult Index() ???????{ ???????????return View(); ???????} ???????[HttpPost] ???????public List<Object> UploadQiniu() ???????{ ???????????Mac mac = new Mac(_Qny.qiniuyunAK, _Qny.qiniuyunSK);// AK SK使用 ????????????PutPolicy putPolicy = new PutPolicy(); ???????????putPolicy.Scope = _Qny.qiniuyunBucket; ???????????string token = Auth.CreateUploadToken(mac, putPolicy.ToJsonString());//token生成 ???????????IFormFileCollection files = Request.Form.Files; ???????????Config config = new Config() ???????????{ ???????????????Zone = Zone.ZONE_CN_East, ???????????????UseHttps = true ???????????}; ???????????var res = Request.Form.ToArray(); ???????????FormUploader upload = new FormUploader(config); ???????????HttpResult result = new HttpResult(); ???????????List<Object> list = new List<Object>(); ???????????foreach (IFormFile file in files)//获取多个文件列表集合 ???????????{ ???????????????if (file.Length > 0) ???????????????{ ???????????????????var _fileName = ContentDispositionHeaderValue ???????????????????????????????????.Parse(file.ContentDisposition) ???????????????????????????????????.FileName ???????????????????????????????????.Trim(‘"‘); ???????????????????var _qiniuName = _Qny.prefixPath + "/" + DateTime.Now.ToString("yyyyMMddHHmmssffffff") + _fileName;//重命名文件加上时间戳 ???????????????????Stream stream = file.OpenReadStream(); ???????????????????result = upload.UploadStream(stream, _qiniuName, token, null); ???????????????????if (result.Code == 200) ???????????????????{ ???????????????????????list.Add(new { fileName = _fileName, qiniuName = _qiniuName, uploadTime = DateTime.Now}); ???????????????????} ???????????????????else ???????????????????{ ???????????????????????throw new Exception(result.RefText);//上传失败错误信息 ???????????????????} ???????????????} ???????????} ???????????return list; ???????}第四部：然后运行上传图片，结果如图所示
本文来自：https://www.cnblogs.com/OMango/p/8447480.html 其中优化了一下
.NET Core项目----七牛云图片上传
原文地址：https://www.cnblogs.com/wuyabaibsd/p/9475180.html