03-10 07:14 阅读 102

Ajax上传文件到C#Action中使用 jquery.form.js

用普通的ajax提交表单的时候,不能把文件流传到后端去,所以要用到jquery.form.js

jquery.form.js到官网下载或者从这里下载:

引用js文件包：jquery.form.js可以下载 http://malsup.com/jquery/form/#download

  var formEle = $("#DefaultPicture_Create_Form");//一定要form.find不然与查询页面重复
                        var defaultPictureName = formEle.find("#DefaultPictureName").val().trim();
                        var defaultPictureID = formEle.find("#DefaultPictureID").val();
                        $("#DefaultPicture_Create_Form").ajaxSubmit({
                            url: "@Url.Action("Save", "DefaultPictureMaintenance")",
                            type: "post",
                            dataType: ‘json‘,
                            data: {
                                DefaultPictureName: defaultPictureName,
                                DefaultPictureID: defaultPictureID
                            },
                            beforeSend: function () {
                                showLoading();
                            },
                            success: function (data) {
                                    debugger
                                if (data.Status == 200) {
                                    showOkClose(data.Message);
                                    closePopup();
                                    DefaultPictureSearch();
                                } else {
                                    showError(data.Message);
                                }
                        },
                            error: function (aa) {
                                debugger;
                            alert(aa);
                            },
                            complete: function () {
                                hideLoading();
                            }
                    });

   /// 
        /// 将 Stream 转成 byte[]
        /// 
        /// 
        /// 
    private byte[] StreamToBytes(Stream stream)
    {
        byte[] bytes = new byte[stream.Length];
        stream.Read(bytes, 0, bytes.Length);
        // 设置当前流的位置为流的开始 
        stream.Seek(0, SeekOrigin.Begin);
        return bytes;
    }
    /// <summary>
    /// 检查文件是否合格，不合格返回错误信息，合格返回空字符
    /// </summary>
    /// <param name="file"></param>
    /// <returns></returns>
    private string CheckUploadFile(HttpPostedFileBase file)
    {
        //判断文件必须小于2M 格式必须PNG JPG
        if (file.ContentType != "image/png" && file.ContentType != "image/jpeg")
        {
          return  "Upload failed! Picture type can only be JPG or PNG.";
        }
        if (file.ContentLength / 1024 > 1024 * 2)
        {
            return"Upload failed! Image size can not be greater than 2M.";
        }
        return "";
    }
    public ActionResult Save(int DefaultPictureID, string DefaultPictureName, HttpPostedFileBase file)
    {
        bool isSaveSuccess = true;
        var DefaultPicture = new DefaultPictureItem();
        if (DefaultPictureID > 0)//编辑
        { //编辑时可以运行File为Null，表示用户没有修改图片
            var defaultPicModel = _defaultPictureService.GetByID(DefaultPictureID);//获取数据库中的
            defaultPicModel.DefaultPictureName = DefaultPictureName;
            defaultPicModel.UpdateBy = "testUser";
            defaultPicModel.UpdateDate = DateTime.Now;
            if (file!=null)
            {
                //判断文件必须小于2M 格式必须PNG JPG
                var errorMsg = CheckUploadFile(file);
                if (!string.IsNullOrEmpty(errorMsg))
                {
                    return Error(errorMsg);
                }
                var fileStream = file.InputStream;
                defaultPicModel.DefaultPictureContent = StreamToBytes(fileStream);
                DefaultPicture.DefaultPictureHaskKey = Guid.NewGuid().ToString();
            }
            isSaveSuccess = _defaultPictureService.Update(defaultPicModel);
        }
        else
        {//新增
            if (file == null)//新增的时候文件内容是必须得

                {

return Error("Upload failed! Image content can not be empty");

}

DefaultPicture.DefaultPictureName = DefaultPictureName;

DefaultPicture.DefaultPictureHaskKey = Guid.NewGuid().ToString();

DefaultPicture.CreateBy = "testUser";

DefaultPicture.CreateDate = DateTime.Now;

DefaultPicture.UpdateBy = "testUser";

DefaultPicture.UpdateDate = DateTime.Now;

//获取文件的内容

//判断文件必须小于2M 格式必须PNG JPG

var errorMsg = CheckUploadFile(file);

if (!string.IsNullOrEmpty(errorMsg))

{

return Error(errorMsg);

}

var fileStream = file.InputStream;

DefaultPicture.DefaultPictureContent = StreamToBytes(fileStream);

isSaveSuccess = _defaultPictureService.Update(DefaultPicture);

}

if (isSaveSuccess)

{

return Success("Save Success");

}

else

{

return Error("Save Failed");

}

}

原文：https://www.cnblogs.com/sunny3158/p/14552912.html