<form id="importFileForm" method="post" enctype="multipart/form-data" style="display:">

            <table style="margin:5px;height:70px;">

                <tr>

                    <td></td>

                    <td width="5px;"></td>

                    <td><input class="easyui-filebox" id="fileImport" data-options="buttonText:'选择',prompt:'请选择文件...'"  name="fileImport" style="width:260px;">

                    </td>

                    <td><a id="uploadFile" class="easyui-linkbutton" data-options="iconCls:'icon-ok'" href="javascript:void(0)">上传</a></td>

                </tr>

                <tr>

                    <td colspan="4">

                        <label id="uploadInfo" />

                    </td>

                </tr>

            </table>

        </form>

    <script>

        //导入文件

        $("#uploadFile").click(function () {

            var formData = new FormData($("#importFileForm")[0]);

            //调用apicontroller后台action方法，将form数据传递给后台处理。contentType必须设置为false,否则chrome和firefox不兼容

            $.ajax({

                url: "http://localhost:12745/api/easyuiUpload/PostExcelData",

                type: 'POST',

                data: formData,

                async: false,

                cache: false,

                contentType: false,

                processData: false,

                success: function (returnInfo) {

                    //上传成功后将控件内容清空，并显示上传成功信息

                    document.getElementById('fileImport').value = null;

                    document.getElementById('uploadInfo').innerHTML = "<span style='color:Red'>" + returnInfo + "</span>";

                },

                error: function (returnInfo) {

                    //上传失败时显示上传失败信息

                    document.getElementById('uploadInfo').innerHTML = "<span style='color:Red'>" + returnInfo + "</span>";

                }

            });

        })

    </script>

后台：

public class easyuiUploadController : ApiController

    {

        /// <summary>

        /// 将文件上传到指定路径中保存

        /// </summary>

        /// <returns>上传文件结果信息</returns>

        [System.Web.Http.HttpPost]

        public string PostExcelData()

        {

            string info = string.Empty;

            try

            {

                //获取客户端上传的文件集合

                HttpFileCollection files = System.Web.HttpContext.Current.Request.Files;

                //判断是否存在文件

                if (files.Count > 0)

                {

                    //获取文件集合中的第一个文件(每次只上传一个文件)

                    HttpPostedFile file = files[0];

                    //定义文件存放的目标路径

                    string targetDir = System.Web.HttpContext.Current.Server.MapPath("~/FileUpLoad/Product");

                    //创建目标路径

                    if (!Directory.Exists(targetDir))

                    {

                        Directory.CreateDirectory(targetDir);

                    }

                    //ZFiles.CreateDirectory(targetDir);

                    //组合成文件的完整路径

                    string path = System.IO.Path.Combine(targetDir, System.IO.Path.GetFileName(file.FileName));

                    //保存上传的文件到指定路径中

                    file.SaveAs(path);

                    info = "上传成功";

                }

                else

                {

                    info = "上传失败";

                }

            }

            catch

            {

                info = "上传失败";

            }

            return info;

        }

    }