NET CORE 3.1 UPLOAD

@{
    ViewBag.Title = "Home Page";
    Layout = null;
}

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <!-- import CSS -->
    <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
</head>
<body>
    <div id="app">
        <el-dialog :visible.sync="visible" title="Hello world">
            <p>Try Element</p>
            <el-upload class="upload-demo"
                       action="@Url.Action("upload")"
                       :on-preview="handlePreview"
                       :on-remove="handleRemove"
                       :before-remove="beforeRemove"
                       :limit="3"
                       :on-exceed="handleExceed"
                       :on-success="handleSuccess"
                       :on-error="handleError"
                       :on-progress="handleProgress"
                       :file-list="fileList">
                <el-button size="small" type="primary">点击上传</el-button>
                <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
        </el-dialog>

    </div>
</body>
<!-- import Vue before Element -->
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<!-- import JavaScript -->
<script src="https://unpkg.com/element-ui/lib/index.js"></script>
<script>
    dd=new Vue({
      el: '#app',
      data: function() {
          return {
              visible:true,
              fileList: []
          }
        },
        methods: {
            handleRemove(file, fileList) {
                console.log(file, fileList);
            },
            handlePreview(file) {
                console.log(file);
            },
            handleExceed(files, fileList) {
                this.$message.warning(`当前限制选择 3 个文件，本次选择了 ${files.length} 个文件，共选择了 ${files.length + fileList.length} 个文件`);
            },
            beforeRemove(file, fileList) {
                return this.$confirm(`确定移除 ${file.name}？`);
            },
            handleSuccess(response, file, fileList) {
                if (response != "") {
                    this.fileList = [];
                    this.$message.warning(response);
                }
                else {
                    this.$message.success("Save Success");
                    self.visible = false;
                }
                console.log("Save Success", file, fileList,"suu");
            },
            handleError(err, file, fileList) {
                console.log(err, file, fileList, "err");
                this.$message.warning(err);
            },
            handleProgress(event, file, fileList) {
                console.log(event, file, fileList,"event");
            }
        }

    })
</script>
</html>

NET

        public ActionResult upload(HttpPostedFileBase file)
        {
            String uploadSectionDir = Path.Combine("Upload", DateTime.Now.ToString("yyyyMMdd"));
            string uploadDir = Path.Combine(HttpRuntime.AppDomainAppPath, uploadSectionDir);
            if (!Directory.Exists(uploadDir))
            {
                Directory.CreateDirectory(uploadDir);
            }
            string fileName = Guid.NewGuid().ToString("N") + Path.GetExtension(file.FileName);
            string filePath = Path.Combine(uploadDir, fileName);
            file.SaveAs(filePath);
            return Json("");

            return Json("error don't upload");
        }

　　NET CORE 3.1

  public async Task<IActionResult> uploadAsync(IFormFile file)
        {
            String uploadSectionDir = Path.Combine("Upload", DateTime.Now.ToString("yyyyMMdd"));
            if (!Directory.Exists(uploadSectionDir))
            {
                Directory.CreateDirectory(uploadSectionDir);
            }
            string fileName = Guid.NewGuid().ToString("N") + Path.GetExtension(file.FileName);
            string filePath = Path.Combine(uploadSectionDir, fileName);

            if (file.Length > 0)
            {
                using (var stream = new FileStream(filePath, FileMode.Create))
                {
                   await file.CopyToAsync(stream);
                }
            }
            return Json("error don't upload");
            return Ok("");
        }

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原文地址：https://www.cnblogs.com/LiuFengH/p/13219219.html