二开样例：BOM子项唯一性校验

物料清单保存时，校验子项物料是否重复，插件代码样例如下：

using Kingdee.BOS.Orm.DataEntity;
using Kingdee.K3.Core.MFG.EntityHelper;
using Kingdee.K3.MFG.App.ServiceValidator;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Kd.Test.validator
{
    public class BomChildUniqueVdt : AbstractMfgServiceValidator
    {
        public override void Validate(Kingdee.BOS.Core.ExtendedDataEntity[] dataEntities, Kingdee.BOS.Core.Validation.ValidateContext validateContext, Kingdee.BOS.Context ctx)
        {
            base.Validate(dataEntities, validateContext, ctx);
            foreach (var exDataEntity in dataEntities)
            {
                DynamicObjectCollection dataEntity = exDataEntity.DataEntity.GetDynamicValue<DynamicObjectCollection>("TreeEntity");
                //BOM子项明细按物料编码分组
                var childMtrlId = dataEntity.Where(w => w.GetDynamicValue<string>("MATERIALTYPE") == "1")
                    .GroupBy(g => g.GetDynamicValue<long>("MATERIALIDCHILD_ID")).ToList();
                StringBuilder errMsg = new StringBuilder();
                foreach (var mtrlGroup in childMtrlId)
                {
                    //分组数量大于1即子项不唯一
                    if (mtrlGroup.Count() > 1)
                    {
                        string mtrlName = mtrlGroup.First().GetDynamicValue<DynamicObject>("MATERIALIDCHILD").GetDynamicValue<string>("Name");
                        string seq = string.Empty;
                        foreach (var item in mtrlGroup)
                        {
                            seq += item.GetDynamicValue<int>("Seq") + ",";
                        }
                        errMsg.AppendLine(string.Format("第{0}行物料{1}重复", seq, mtrlName));
                    }
                }
                if (errMsg.Length > 0)
                {
                    this.vContext.AddError(exDataEntity.DataEntity, exDataEntity.DataEntityIndex, errMsg.ToString(), this.OperationName);
                }
            }
        }
    }

    public class BomSaveExt : AbstractOperationServicePlugIn
    {
        public override void OnAddValidators(Kingdee.BOS.Core.DynamicForm.PlugIn.Args.AddValidatorsEventArgs e)
        {
            base.OnAddValidators(e);
            e.Validators.Add(new BomChildUniqueVdt() { EntityKey = "FBillHead", TimingPointString = ",Save," });
        }
    }
}