小编Ye *_*int的帖子

我是react.js和ASP.Net核心2.0的新手.现在使用ASP.Net core 2.0作为后端API和react.js作为应用程序接口(前端)编写项目.我想知道如何上传文件.我尝试了如下,但在后端方面,参数值(IFromFile文件)始终为null.而且似乎文件没有正确发布.这是我的代码:

.Net核心(API)

[HttpPost]
        [Route("upload")]
        public async Task Upload(IFormFile file)
        {
            if (file == null) throw new Exception("File is null");
            if (file.Length == 0) throw new Exception("File is empty");

            using (Stream stream = file.OpenReadStream())
            {
                using (var binaryReader = new BinaryReader(stream))
                {
                    var fileContent =  binaryReader.ReadBytes((int)file.Length);
                   // await _uploadService.AddFile(fileContent, file.FileName, file.ContentType);
                }
            }
        }

React.js

handleClick(event){
        event.preventDefault();
        // console.log("handleClick",event);
        var self = this;
        var apiBaseUrl =  axios.defaults.baseURL + "user/upload";
        if(this.state.filesToBeSent.length>0){
            var filesArray = this.state.filesToBeSent;
            const reader = new FileReader(); …