基于 FinUICore，实现文件上传到数据库与下载

最终效果如图：

功能实现：
1、表单有两个上传字段，用于上传2个文件；

2、点 “浏览”选择错误的文件，可通过 “删除->重置上传控件” 重置；

3、点“保存并关闭” 保存数据并上传文件；

4、重新打开工序报工，可编辑（已保存的表单数据和文件名会重新显示到页面）。如果已上传文件，则上传控件后的 “下载” 和 “删除->删除” 按钮可用；

5、编辑状态，如上传控件重选文件，“保存并关闭”则会覆盖原文件；

6、点 “删除->删除”，可删除文件，不需要点保存即删除（删除前提示确认）；删除成功后，控件中的文件名清除、 “下载” 和 “删除->删除” 按钮不可用；

以下介绍实现步骤：

一、创建模型

public class R_QC: IKeyID
    {
        [Key]
        public int ID { get; set; }

        [Display(Name ="PO工序")]
        [Required]
        public int POProcID { get; set; }
        public B03_POProc B03_POProc { get; set; }

        [Display(Name ="送检人员")]
        public int? SQCID { get; set; }
        public User SQC { get; set; }

        [Display(Name ="检验人员")]
        public int? QCID { get; set; }
        public User QC { get; set; }

        [Display(Name ="计划检完时间")]
        public DateTime? PFinishTime { get; set; }

        [Display(Name = "开始检验时间")]
        public DateTime? StartTime { get; set; }

        [Display(Name = "完成检验时间")]
        public DateTime? EndTime { get; set; }

        [Display(Name = "检验结果")]
        [StringLength(50)]
        public string QCResult { get; set; }

        [Display(Name = "检验单上传")]
        [StringLength(200)]
        public string QCReport { get; set; }

        [Display(Name = "检验单上传")]
        public byte[] QCReportContent { get; set; }

        [Display(Name = "拍照留底")]
        [StringLength(200)]
        public string Photo { get; set; }
        [Display(Name = "拍照留底")]
        public byte[] PhotoContent { get; set; }

        [Display(Name = "备注")]
        [StringLength(500)]
        public string Remark { get; set; }

        [Display(Name = "操作人")]
        public int OperatorID { get; set; }
        public User Operator { get; set; }

        [Display(Name = "状态")]
        public int StatusID { get; set; }
        public A07_Statu A07_Statu { get; set; }

        [Display(Name = "创建时间")]
        public DateTime? CreateTime { get; set; }
    }

生成的数据表如下图，其中，2个红框为两个文件记录字段，一个字段记录文件名，一个字段存储文件。

二、前端界面设计

1、为了实现“上传控件”、“删除”、“下载” 按钮在同一行，需要为  <f:FormRow > 控件标签增加  ColumnWidths="100%"  属性。

 2、在上传控件后面添加一组菜单按钮，包含  “重置上传控件” 和 “删除”两个菜单按钮。

• 重置上传控件：点击上传控件的浏览按钮，且选择文件后，可能需要取消选择（不是重选，是取消、不想上传了），可使用该按钮重置、取消选择；方法是为 “重置上传控件” 按钮指定JS，通过 reset() 方法重置。
• 删除：编辑时，可能需要将已上传文件删除；按钮执行JS，JS弹框提示，点OK后，触发后台事件删除；”删除“ 代码见 “四、文件下载与文件删除”

@page
@model XXX.Pages.WH.R_QCModel
@{
    ViewData["Title"] = "R_QC";
    var F = Html.F();
}

@section head {

}

@section body{

    <f:Panel ID="Panel1" ShowBorder="false" ShowHeader="false" AutoScroll="true" IsFluid="true" IsViewPort="true">
        <Toolbars>
            <f:Toolbar ID="Toolbar1" Position="Top" ToolbarAlign="Left">
                <Items>
                    <f:Button ID="btnClose" Icon="SystemClose" Text="关闭">
                        <Listeners>
                            <f:Listener Event="click" Handler="F.activeWindow.hide();"></f:Listener>
                        </Listeners>
                    </f:Button>
                    <f:ToolbarSeparator></f:ToolbarSeparator>
                    <f:Button ID="btnSaveClose" ValidateForms="SimpleForm1" OnClickFields="SimpleForm1" Icon="SystemSaveClose" OnClick="@Url.Handler("BtnSaveClose_Click")" Text="保存后关闭"></f:Button>
                    <f:ToolbarSeparator></f:ToolbarSeparator>
                    <f:Button ID="btnFinishClose" ValidateForms="SimpleForm1" OnClickFields="SimpleForm1" IconFont="Check" OnClick="@Url.Handler("BtnSaveClose_Click")" Text="完工关闭"></f:Button>
                </Items>
            </f:Toolbar>
        </Toolbars>
        <Items>
            <f:Form ID="SimpleForm1" ShowBorder="false" ShowHeader="false" BodyPadding="10" LabelWidth="110">
                <Rows>
                    <f:FormRow>
                        <Items>
                            <f:DropDownList For="currentR_QC.SQCID" DataTextField="ChineseName" AutoSelectFirstItem="false" DataSource="@Model.Users"
                                            DataValueField="ID" EmptyText="请选择人员..." EnableEdit="true"></f:DropDownList>                            
                            <f:HiddenField ID="currentR_QCID" Text="@Model.currentR_QCID"></f:HiddenField>
                            <f:HiddenField ID="currentR_QCRProcID" Text="@Model.SelectedNodesID"></f:HiddenField>
                        </Items>
                    </f:FormRow>
                    <f:FormRow>
                        <Items>
                            <f:DropDownList For="currentR_QC.QCID" DataTextField="ChineseName" AutoSelectFirstItem="false" DataSource="@Model.Users"
                                            DataValueField="ID" EmptyText="请选择人员..." EnableEdit="true"></f:DropDownList>
                        </Items>
                    </f:FormRow>
                    <f:FormRow>
                        <Items>
                            <f:TriggerBox For="currentR_QC.PFinishTime" EmptyText="请选择时间" TriggerIcon="Date" CssClass="dtime"></f:TriggerBox>
                        </Items>
                    </f:FormRow>
                    <f:FormRow>
                        <Items>
                            <f:TriggerBox For="currentR_QC.StartTime" EmptyText="请选择时间" TriggerIcon="Date" CssClass="dtime"></f:TriggerBox>
                        </Items>
                    </f:FormRow>
                    <f:FormRow>
                        <Items>
                            <f:TriggerBox For="currentR_QC.EndTime" EmptyText="请选择时间" TriggerIcon="Date" CssClass="dtime">
                            </f:TriggerBox>
                        </Items>
                    </f:FormRow>
                    <f:FormRow>
                        <Items>
                            <f:TextBox For="currentR_QC.QCResult"></f:TextBox>
                        </Items>
                    </f:FormRow>
                    <f:FormRow ColumnWidths="100%">
                        <Items>
                            <f:FileUpload ID="QCReportContent" Label=检验单上传 AcceptFileTypes="image/*" ButtonIcon="Add" Text="@Model.QCReport"></f:FileUpload>
                            <f:Button ID="btDelete" Icon="Delete" Text="删除...">
                                <Menu>
                                    <f:MenuButton ID="rsQCReportContent" Text="重置上传控件" IconFont="Repeat">
                                        <Listeners>
                                            <f:Listener Event="click" Handler="reSetQCReportContent();"></f:Listener>
                                        </Listeners>
                                    </f:MenuButton>
                                    <f:MenuButton ID="mbtDeleteQ" Text="删除" Enabled="@Model.btQCReport" IconFont="Remove">
                                        <Listeners>
                                            <f:Listener Event="click" Handler="reMoveFile('Q');"></f:Listener>
                                        </Listeners>
                                    </f:MenuButton>
                                </Menu>
                            </f:Button>
                            <f:Button ID="btDownloadQCRep" IconFont="Download" Text="下载" Enabled="@Model.btQCReport">
                                <Listeners>
                                    <f:Listener Event="click" Handler="downLoad('QCReport');"></f:Listener>
                                </Listeners>
                            </f:Button>
                        </Items>
                    </f:FormRow>
                    <f:FormRow ColumnWidths="100%">
                        <Items>
                            <f:FileUpload ID="PhotoContent" Label="拍照留底" AcceptFileTypes="image/*" ButtonIcon="Add" Text="@Model.Photo"></f:FileUpload>
                            <f:Button ID="btDelete" Icon="Delete" Text="删除...">
                                <Menu>
                                    <f:MenuButton ID="rsPhotoContent" Text="重置上传控件" IconFont="Repeat">
                                        <Listeners>
                                            <f:Listener Event="click" Handler="reSetPhotoContent();"></f:Listener>
                                        </Listeners>
                                    </f:MenuButton>
                                    <f:MenuButton ID="mbtDeleteP" Text="删除" Enabled="@Model.btPhoto" IconFont="Remove">
                                        <Listeners>
                                            <f:Listener Event="click" Handler="reMoveFile('P');"></f:Listener>
                                        </Listeners>
                                    </f:MenuButton>
                                </Menu>                                
                            </f:Button>
                            <f:Button ID="btDownloadPhoto" IconFont="Download" Text="下载" Enabled="@Model.btPhoto">
                                <Listeners>
                                    <f:Listener Event="click" Handler="downLoad('Photo');" ></f:Listener>
                                </Listeners>
                            </f:Button>
                        </Items>
                    </f:FormRow>
                    <f:FormRow>
                        <Items>
                            <f:TextArea For="currentR_QC.Remark" AutoGrowHeight="true" EmptyText="最多500字"></f:TextArea>
                        </Items>
                    </f:FormRow>
                </Rows>
            </f:Form>
        </Items>
    </f:Panel>
}


@section script {
    <script src="~/res/third-party/layDate-v5.2.0\laydate\laydate.js" type="text/javascript"></script>
    <script>

        function reSetPhotoContent() {
            var f = F.ui.PhotoContent;
            f.reset();
        }

        function reSetQCReportContent() {
            var f = F.ui.QCReportContent;
            f.reset();
        }

        function reMoveFile(actionType) {
            F.confirm({
                    message: '确定删除此文件吗？',
                    target: '_top',
                    ok: function () {
                        // 触发后台事件
                        F.doPostBack('@Url.Handler("RemoveFile")', 'SimpleForm1',{
                            actionType: actionType
                        });
                    }
                });
        }

        function downLoad(button) {
            var id = F.ui.currentR_QCID.value;
            window.location.href = '@Url.Content("~/WH/DownLoad?ID=")' + id + "&button=" + button + "&station=R_QC" ;
        }

        F.ready(function () {
            lay('.dtime').each(function () {
                laydate.render({
                    elem: this.getElementsByTagName('input')[0]  //this.getElementsByTagName('input')[0]   //this.childNodes[1].childNodes[0].childNodes[0]  //两种方法均可定位到input元素；
                    , eventElem: this.getElementsByTagName('i')[0]
                    , type: 'datetime' //datetime,
                    , show: false
                    //, trigger: 'click'
                    //, closeStop: '#tbxMyBox-inputEl'
                    , position: 'abolute' //默认值：absolute,绝对定位，始终吸附在绑定元素周围;  fixed固定定位，初始吸附在绑定元素周围，不随浏览器滚动条所左右。
                    , zIndex: 10029
                    // , theme: 'molv'
                    , calendar: true
                });
            });
        });
    </script>

}

三、数据初始化及上传

1、页面初始化
下载、删除按钮默认不可用；如果记录已存在，上传控件显示文件名，并将下载、删除按钮设置为可用。

public class R_QCModel : BaseAdminModel
    {
        [BindProperty]
        public R_QC currentR_QC { get; set; }
        public IEnumerable<User> Users { get; set; }  　　　//检验员、送检员下拉列表；
        public int SelectedNodesID { get; set; }           //选择的工序ID
        public int currentR_QCID { get; set; }
        public string Photo { get; set; }           　　　  //文件名称
        public string QCReport { get; set; }              //文件名称
        public bool btPhoto { get; set; }                 //下载、删除按钮是否启用；
        public bool btQCReport { get; set; }              //下载、删除按钮是否启用；

        private readonly long _fileSizeLimit=299999;
        private readonly string[] _permittedExtensions = { ".txt",".png" ,".jpeg", ".jpg",".gif" };



        public async Task<IActionResult> OnGetAsync(int proc)
        {
            //下载、删除按钮默认不可用；
            btPhoto = false;
            btQCReport = false;

            // 如果记录已存在，上传控件显示文件名，并将下载、删除按钮设置为可用；
            R_QC _currentR_QC = new R_QC();
            _currentR_QC = await DB.R_QC.Include(q => q.SQC).Include(q => q.QC).
            Where(p => p.POProcID == proc).FirstOrDefaultAsync();

            if (_currentR_QC != null)
            {
                currentR_QC = _currentR_QC;
                QCReport=_currentR_QC.QCReport;
                Photo= _currentR_QC.Photo;
                currentR_QCID = _currentR_QC.ID;

                if (_currentR_QC.QCReportContent!=null)
                {
                    btQCReport = true;
                }
                if (_currentR_QC.PhotoContent!=null)
                {
                    btPhoto = true;
                }

            }
            SelectedNodesID = proc;
            Users = await DB.Users.ToListAsync();            
            return Page();
        }
    }

2、数据、文件上传后端代码

 public async Task<IActionResult> OnPostBtnSaveClose_ClickAsync(string currentR_QCRProcID, string currentR_QCID, List<IFormFile> QCReportContent,List<IFormFile> PhotoContent)
        {
            //ModelState.Remove("currentR_QC.ID");

            if (ModelState.IsValid)
            {                
                
                var _r = await DB.R_QC.Include(q => q.SQC).Include(q => q.QC).Where(q=>q.ID== Convert.ToInt32(currentR_QCID)).SingleOrDefaultAsync();

                //_r 不为空，则更新；
                if (_r != null)
                {
                    if (await TryUpdateModelAsync<R_QC>(_r, "currentR_QC"
                        ,r => r.SQCID
                        , r => r.QCID
                        ,r=>r.StartTime
                        ,r=>r.EndTime
                        ,r=>r.PFinishTime
                        ,r=>r.QCResult
                        ,r=>r.Remark
                        )
                        )
                    {
                        //文件
                        foreach (var formFile in QCReportContent)
                        {
                            var formFileContent =
                                await FileHelpers.ProcessFormFile<BufferedMultipleFileUploadDb>(
                                    formFile, ModelState, _permittedExtensions,
                                    _fileSizeLimit);

                            //// Perform a second check to catch ProcessFormFile method
                            //// violations. If any validation check fails, return to the
                            //// page.
                            if (!ModelState.IsValid)
                            {
                                //Alert.Show( "请上传正确格式的文件！");
                                return UIHelper.Result();
                            }

                            _r.QCReportContent = formFileContent;
                            _r.QCReport = formFile.FileName;
                        }
                        foreach (var formFile in PhotoContent)
                        {
                            var formFileContent =
                                await FileHelpers.ProcessFormFile<BufferedMultipleFileUploadDb>(
                                    formFile, ModelState, _permittedExtensions,
                                    _fileSizeLimit);

                            if (!ModelState.IsValid)
                            {
                                //Alert.Show( "请上传正确格式的文件！");
                                return UIHelper.Result();
                            }

                            _r.PhotoContent = formFileContent;
                            _r.Photo = formFile.FileName;
                        }
                    } 
                }
                else  //如果记录不存在，则新增记录；
                {
                    currentR_QC.POProcID = Convert.ToInt32(currentR_QCRProcID);
                    currentR_QC.OperatorID = (int)GetIdentityID();
                    currentR_QC.CreateTime = DateTime.Now;
                    currentR_QC.StatusID = 6;

                    foreach (var formFile in QCReportContent)
                    {
                        var formFileContent =
                               await FileHelpers.ProcessFormFile<BufferedMultipleFileUploadDb>(
                                   formFile, ModelState, _permittedExtensions,
                                   _fileSizeLimit);

                        if (!ModelState.IsValid)
                        {
                            //Alert.Show( "请上传正确格式的文件！");
                            return UIHelper.Result();
                        }

                        currentR_QC.QCReportContent = formFileContent;
                        currentR_QC.QCReport = formFile.FileName;
                    }

                    foreach (var formFile in PhotoContent)
                    {
                        var formFileContent =
                            await FileHelpers.ProcessFormFile<BufferedMultipleFileUploadDb>(
                                formFile, ModelState, _permittedExtensions,
                                _fileSizeLimit);

                        if (!ModelState.IsValid)
                        {
                            //Alert.Show( "请上传正确格式的文件！");
                            return UIHelper.Result();
                        }

                        currentR_QC.PhotoContent = formFileContent;
                        currentR_QC.Photo = formFile.FileName;
                    }

                    DB.R_QC.Add(currentR_QC);
                }
                await DB.SaveChangesAsync();
                // 关闭本窗体（触发窗体的关闭事件）
                ActiveWindow.HidePostBack();
            }
            return UIHelper.Result();
        }

public class BufferedMultipleFileUploadDb
        {
            [Required]
            [Display(Name = "File")]
            public List<IFormFile> FormFiles { get; set; }

            [Display(Name = "Note")]
            [StringLength(50, MinimumLength = 0)]
            public string Note { get; set; }
        }

四、文件下载及文件删除

 1、文件下载后端代码

文件下载，采用跳转页面方式进行。

• 创建下载页面，页面名称：Download.cshtml

@page
@model XXX.Pages.WH.DownloadModel

@section body{ 
<h2>下载出错，文件不存在或已被删除！</h2>
}

public class DownloadModel : BaseAdminModel
    {
        public async Task<IActionResult> OnGetAsync(int ID,string station,string button)
        {
            if (ID != 0)
            {
                if (station == "R_QC")
                {
                    var requestFile = await DB.R_QC.SingleOrDefaultAsync(q => q.ID == ID);
                    if (requestFile == null)
                    {
                        return Page();
                    }

                    if (button == "Photo")
                    {
                        if (requestFile.PhotoContent == null)
                        {
                            return Page();
                        }
                        return File(requestFile.PhotoContent, MediaTypeNames.Application.Octet, requestFile.Photo);
                    }
                    if (button == "QCReport")
                    {
                        if (requestFile.QCReportContent == null)
                        {
                            return Page();
                        }
                        return File(requestFile.QCReportContent, MediaTypeNames.Application.Octet, requestFile.QCReport);
                    }
                }

                else if (button == "R_QC_Photo")
                {

                }

            }

            return Page();
        }
    }

• 执行下载

2、文件删除后端代码

 //删除已上传的文件
        public async Task<IActionResult>OnPostRemoveFileAsync(string actionType,string currentR_QCID)
        {
            var _r = await DB.R_QC.Where(p => p.ID == Convert.ToInt32(currentR_QCID)).SingleOrDefaultAsync();
            if (_r == null)
            {
                Alert.Show("文件已删除！");
                return UIHelper.Result();
            }

            if (actionType == "Q")
            {
                _r.QCReportContent = null;
                _r.QCReport = null;
                //更新前端控件
                UIHelper.FileUpload("QCReportContent").Text("");
                UIHelper.Button("btDownloadQCRep").Enabled(false);
                UIHelper.MenuButton("mbtDeleteQ").Enabled(false);
            }
            if (actionType == "P")
            {
                _r.PhotoContent = null;
                _r.Photo = null;
                //更新前端控件
                UIHelper.FileUpload("PhotoContent").Text("");
                UIHelper.Button("btDownloadPhoto").Enabled(false);
                UIHelper.MenuButton("mbtDeleteP").Enabled(false);
            }

            await DB.SaveChangesAsync();            
            return UIHelper.Result();
        }

以上是本文全部内容。