ASP.NET Core Web API接收文件传输

ASP.NET解析API参数的方式有很多种，包括[FromBody],[FromForm],[FromServices],[FromHeader][FromQuery].

文件传输方式也分很多种，包括

1） 前端读取文件内容，将内容以text/xml/json/binary等形式传输。

2）前端不做任何处理，将文件放到Form中传输。

此处对Form传输文件进行介绍，可以将form看作是个多功能的词典类型，value值可以是text，也可以是FormFile.

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IFormFile fileinput

​[HttpPost]
        [Route("PostFile")]
        public String PostFile([FromForm] IFormCollection formCollection)
        {
            String result = "Fail";
            if (formCollection.ContainsKey("user"))
            {
                var user = formCollection["user"];
            }
            FormFileCollection fileCollection = (FormFileCollection)formCollection.Files;
            foreach (IFormFile file in fileCollection)
            {
                StreamReader reader = new StreamReader(file.OpenReadStream());
                String content = reader.ReadToEnd();
                String name = file.FileName;
                String filename = @"D:/Test/" + name;
                if (System.IO.File.Exists(filename))
                {
                    System.IO.File.Delete(filename);
                }
                using (FileStream fs = System.IO.File.Create(filename))
                {
                    // 复制文件
                    file.CopyTo(fs);
                    // 清空缓冲区数据
                    fs.Flush();
                }
                result = "Success";
            }
            return result;
        }
​单文件：
​ public IActionResult  upload(IFormFile fileinput) {}
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