开发案例分享-单据转换之多单据体转换

一、问题描述：

如下图，标准系统仅支持一个单据体的字段映射，配置多个单据体映射保存时报错

二、解决方法：可通过单据转换插件进行处理

2.1、插件代码如下：

using System;

using System.Collections.Generic;

using System.ComponentModel;

using Kingdee.BOS.Core;

using Kingdee.BOS.Core.Metadata;

using Kingdee.BOS.Core.Metadata.ConvertElement.PlugIn;

using Kingdee.BOS.Core.Metadata.ConvertElement.PlugIn.Args;

using Kingdee.BOS.Core.Metadata.EntityElement;

using Kingdee.BOS.Core.Metadata.FormElement;

using Kingdee.BOS.Orm.DataEntity;

using Kingdee.BOS.Contracts;

using Kingdee.BOS.App;

namespace Dave.ConvertDemo.ServicePlugIn

{

    /// <summary>

    /// 按顺序输出单据转换-下推过程的插件事件

    /// </summary>

    [Kingdee.BOS.Util.HotUpdate]

    [Description("多单据体单据转换插件")]

    public class MulEntity : AbstractConvertPlugIn

    {

        //// <summary>

        /// 主单据体的字段携带完毕，与源单的关联关系创建好之后，触发此事件

        /// </summary>

        /// <param name="e"></param>

        public override void OnAfterCreateLink(CreateLinkEventArgs e)

        {

            // 预先获取一些必要的元数据，后续代码要用到：

            // 源单第二单据体

            Entity srcSecondEntity = e.SourceBusinessInfo.GetEntity("F_QYGN_Entity");

            // 目标单第一单据体

            Entity mainEntity = e.TargetBusinessInfo.GetEntity("FEntity");

            // 目标单第二单据体

            Entity secondEntity = e.TargetBusinessInfo.GetEntity("F_QYGN_Entity");

            // 目标单关联子单据体

            Entity linkEntity = null;

            Form form = e.TargetBusinessInfo.GetForm();

            if (form.LinkSet != null

                && form.LinkSet.LinkEntitys != null

                && form.LinkSet.LinkEntitys.Count != 0)

            {

                linkEntity = e.TargetBusinessInfo.GetEntity(

                    form.LinkSet.LinkEntitys[0].Key);

            }

            if (linkEntity == null)

            {

                return;

            }

            // 获取生成的全部下游单据

            ExtendedDataEntity[] billDataEntitys = e.TargetExtendedDataEntities.FindByEntityKey("FBillHead");

            // 对下游单据，逐张单据进行处理

            foreach (var item in billDataEntitys)

            {

                DynamicObject dataObject = item.DataEntity;

                // 定义一个集合，用于收集本单对应的源单内码

                HashSet<long> srcBillIds = new HashSet<long>();

                // 开始到主单据体中，读取关联的源单内码

                DynamicObjectCollection mainEntryRows =

                    mainEntity.DynamicProperty.GetValue(dataObject) as DynamicObjectCollection;

                foreach (var mainEntityRow in mainEntryRows)

                {

                    DynamicObjectCollection linkRows =

                        linkEntity.DynamicProperty.GetValue(mainEntityRow) as DynamicObjectCollection;

                    foreach (var linkRow in linkRows)

                    {

                        long srcBillId = Convert.ToInt64(linkRow["SBillId"]);

                        if (srcBillId != 0

                            && srcBillIds.Contains(srcBillId) == false)

                        {

                            srcBillIds.Add(srcBillId);

                        }

                    }

                }

                if (srcBillIds.Count == 0)

                {

                    continue;

                }

                // 开始加载源单第二单据体上的字段

                // 确定需要加载的源单字段（仅加载需要携带的字段）

                List<SelectorItemInfo> selector = new List<SelectorItemInfo>();

                selector.Add(new SelectorItemInfo("F_QYGN_TestText"));

                selector.Add(new SelectorItemInfo("F_QYGN_TestDecimal"));

                selector.Add(new SelectorItemInfo("F_QYGN_TestDepartment"));

                // TODO: 继续添加其他需要携带的字段，示例代码略

                // 设置过滤条件

                string filter = string.Format(" {0} I