【应用场景】

单据列表点击超链接实现下载或预览多选附件（文件服务）附件

【注意事项】

PT-148001 [8.1.0.20230420] 版本开始支持

【案例演示】

多选附件（文件服务）字段在列表上显示对应文件名的超链接，点击后进行下载或预览

【实现步骤】

<1>编写表单插件和服务插件，代码如下。 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using Kingdee.BOS.Core.DynamicForm.PlugIn.Args;
using Kingdee.BOS.Core.FileServer;
using Kingdee.BOS.Core.List;
using Kingdee.BOS.Core.List.PlugIn;
using Kingdee.BOS.Core.List.PlugIn.Args;
using Kingdee.BOS.JSON;
using Kingdee.BOS.ServiceHelper.FileServer;
using Kingdee.BOS.Util;
using Kingdee.BOS.Web.DynamicForm;

namespace DemoPlugin
{
    [Description("单据列表点击预览多选附件-列表插件"), HotUpdate]
    public class BillListAttachmentsPreviewPlugin : AbstractListPlugIn
    {
        /// <summary>
        /// 这里换成自己实际的“多选附件（文件服务）的标识
        /// </summary>
        private const string _attachmentsFieldKey = "FEntityAttachments";

        public override void ListCreateColumns(ListCreateColumnsEventArgs e)
        {
            base.ListCreateColumns(e);

            var attachmentNameCol = e.Columns
                .Select(c => c as JSONObject)
                .FirstOrDefault(c => _attachmentsFieldKey.EqualsIgnoreCase(c["dataIndex"].GetString()));
            // 超链接
            attachmentNameCol["xColDspCtrlType"] = "kdlinkbutton";
        }

        public override void AfterBindData(EventArgs e)
        {
            base.AfterBindData(e);

            PraseLinkCommand();
        }

        public override void EntryButtonCellClick(EntryButtonCellClickEventArgs e)
        {
            base.EntryButtonCellClick(e);
            if (e.FieldKey.EqualsIgnoreCase(_attachmentsFieldKey))
            {
                var fileInfoJson = this.ListView.CurrentSelectedRowInfo.DataRow[_attachmentsFieldKey];
                AttachmentsInfo[] fileInfo = JsonUtil.DeserializeObject<AttachmentsInfo[]>(fileInfoJson.GetString());

                int clickIndex;
                if (fileInfo != null
                    && e.ExtParameters.TryGetValue("clickChildIndex", -1, out clickIndex))
                {
                    if (clickIndex >= 0 && clickIndex < fileInfo.Length)
                    {
                        //DownloadFile(fileInfo, clickIndex);

                        PreviewFile(fileInfo, clickIndex);
                    }
                }
            }
        }

        private void PreviewFile(AttachmentsInfo[] fileInfo, int clickIndex)
        {
            var currentFile = fileInfo[clickIndex];

            // v9以前版本
            //var method = typeof(DynamicWebFormView).GetMethod("FilePreviewForAttachmentField", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
            //method.Invoke(this.View, new object[] { currentFile.ServerFileName });

            // v9版本
            FileServerHelper.PreviewFile(
                new FilePreviewArgs()
                    .SetArgs(this.View, 0),
                new List<FilePreviewInfo>
                {
                    new FilePreviewInfo(FilePreviewType.FileId, currentFile.ServerFileName, currentFile.FileName)
                });
        }

        private void DownloadFile(AttachmentsInfo[] fileInfo, int clickIndex)
        {
            var currentFile = fileInfo[clickIndex];
            var method = typeof(DynamicWebFormView).GetMethod("FileDownloadForAttachmentField", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
            method.Invoke(this.View, new object[] { this.View.BillBusinessInfo.GetField(_attachmentsFieldKey), currentFile.ServerFileName });
        }

        private void PraseLinkCommand()
        {
            var data = new JSONObject();
            var splitPattern = new JSONObject();
            // 分割方式 0：左右分割；1：上下分割
            splitPattern.Put("splitStyle", 0);
            // 分割字符
            splitPattern.Put("splitChar", "|");
            data.Put("splitPattern", splitPattern);
            data.Put("key", _attachmentsFieldKey.ToUpperInvariant());
            data.Put("row", -1);
            this.View.GetControl("FLIST").InvokeControlMethod("UpdateFieldStates", data);
        }

        private class AttachmentsInfo
        {
            public string ServerFileName { get; set; }
            public string FileName { get; set; }
            public string FileLength { get; set; }
            public string FileBytesLength { get; set; }
        }
    }
}

<2>拷贝插件组件到应用站点的WebSite\Bin目录下，重启IIS。

<3>BOSIDE扩展目标单据，注册列表插件，保存元数据，开发完毕。

【功能验证】

<1>登录业务站点，打开目标单据列表界面，点击超链接下载或预览附件