.NET Core 文件的上传与下载

1.前言

　　　文件导入导出是简单且常用的功能，以下示例实现了文件上传与下载的几种方法，如有不妥的地方，欢迎指正。小白一枚，在往目标前进。

2.1.文件上传 -- 纯文件

 <form action="/Home/Index" method ="post" enctype="multipart/form-data" >

     <input type="file" multiple/>

     <input id="upload" type="submit" />

 </form>

    [HttpPost]

         public IActionResult Index(List<IFormFile> files)

         {

                         foreach (var file in files)

             {

                 //获取文件名

                 var fileName = file.FileName;

                 //保存在wwwroot文件夹下

                 fileName = hostingEnv.WebRootPath + $"\\{fileName}";                 using (FileStream fs = System.IO.File.Create(fileName))

                 {

                     file.CopyTo(fs);

                     fs.Flush();

                 }

             }

             return View();

         }

2.2.文件上传 -- 多类型内容上传

对于这种不只有文件的表单，可以采用模型绑定的方式。

 <form action="/Home/Index" method ="post" enctype="multipart/form-data" > 
     <input type="file" multiple/>
     <input type="text" name="Name"/>
     <input id="upload" type="submit" /> 
 </form>

        /// <summary>

        /// 表单上传文件

        /// </summary>

        /// <param name="files"></param>

        /// <returns></returns>

        [HttpPost]

        public IActionResult Index(FormObject obj)

        {

            foreach (var file in obj.Files)

            {

                //获取文件名

                var fileName = ContentDispositionHeaderValue

                                .Parse(file.ContentDisposition)

                                .FileName

                                .Trim('"');

                fileName = hostingEnv.WebRootPath + $"\\{fileName}";

                using (FileStream fs = System.IO.File.Create(fileName))

                {

                    file.CopyTo(fs);

                    fs.Flush();

                }

            }

            return View();

        }

//模型类

public class FormObject

{

       public List<IFormFile> Files{ get; set; }

       public string Name { get; set; }

}

2.3.文件上传 -- Ajax上传

    <input type="text" name="Name" value="123"/>

    <input type="file" id="fileUpload" name="fileUpload" multiple/>

    <input id="upload" type="button" value="ajax 提交"/>

<script type="text/javascript">

    $(function () {

        $("#upload").click(function (evt) {

            ///取选择的文件加入FormData中

            var fileUpload = $("#fileUpload").get(0);

            var files = fileUpload.files;

            var data = new FormData();

            for (var i = 0; i < files.length; i++) {

                data.append(files[i].name, files[i]);

            }

           // data.append("Name", $('input[name="Name"]').val())

            $.ajax({

                type: "POST",

                url: "http://192.168.0.175:8095/api/Organization",

                contentType: false,

                processData: false,

                data: data,

                success: function (message) {

                    alert(message);

                },

                error: function () {

                    alert("上传文件出现错误！");

                }

            });

        });

    });

</script>

        /// <summary>

        /// 通过ajax上传

        /// </summary>

        /// <returns></returns>

        public IActionResult UploadFiles()

        {var files = Request.Form.Files;

            var value =Request.Form.First(c => c.Key == "Name").Value;//获得表单文本项

            foreach (var file in files)

            {

                var fileName = file.FileName;

                fileName = hostingEnv.WebRootPath + $@"\{fileName}";using (FileStream fs = System.IO.File.Create(fileName))

                {

                    file.CopyTo(fs);

                    fs.Flush();

                }

            }

            return RedirectToAction("/Export", new { Title ="",Name = });

        }

3.3.文件下载

        [HttpGet]

         public IActionResult ExportText()

         {

             string sFileName = $@"qmhuangtext{DateTime.Now.ToString("yyyyMMddHHmmss")}.txt";

             FileStream fs =new FileStream(sFileName,FileMode.OpenOrCreate);

             StreamWriter sw = new StreamWriter(fs);

             sw.WriteLine("Hello world");

             sw.Flush();

             sw.Close();

             fs.Close();

             return File(new FileStream(sFileName, FileMode.Open), "application/octet-stream", $"导出测试{DateTime.Now.ToString("yyyyMMddHHmmss")}.txt");

         }

巴特西

.NET Core 文件的上传与下载

1.前言

2.1.文件上传 -- 纯文件

2.2.文件上传 -- 多类型内容上传

2.3.文件上传 -- Ajax上传

3.3.文件下载

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