自定义xtraGrid mater/ detail 数据结构显示

xtraGrid 本身支持DataSet master/detail的数据直接帮定.可以参看其文档,
当然也可以继承接口:DevExpress.Data.IRelationList  定义自己的数据源.

还有可以动态来帮定detail的数据.- 通过事件触发的方式.
根据今天我的探索,写一点动态帮定经验.

我有两个实体类
1. orderItem 继承了myCollectionBase(来之于CollectionBase)
2. item (明细类)

[DBTableAttr("SalesOrder")]
    public class orderItem : myCollectionBase
    {
        public orderItem()
        {
        }


        public bool FoundFlag
        {
            get
            {
                if (this.Count > 0)
                    return true;
                else
                    return false;
            }
        }
      
        [DBColumnAttr("ordersn")]
        public String OrderSn
        {
            get { return _orderSn; }
            set { _orderSn = value; }
        }
        [DBColumnAttr("OrderApplyDate")]
        public Object OrderApplyDate
        {
            get { return _orderApplyDate; }
            set { _orderApplyDate = value; }
        }
        [DBColumnAttr("DeliveryLocation")]
        public String DeliveryLocation
        {
            get { return _deliveryLocation; }
            set { _deliveryLocation = value; }
        }
   

        
        private String _orderSn ="";
        private Object _orderApplyDate;
        private String _deliveryLocation ="";
        //private bool _foundFlag = false;


        class item#region class item

        [DBTableAttr("SalesOrder_Detail")]
        public class item
        {



            [DBColumnAttr("OrderItemId")]
            public int  OrderItemId
            {
                get { return _orderItemId; }
                set { _orderItemId = value; }
            }
            [DBColumnAttr("OrderSn")]
            public String OrderSn
            {
                get { return _orderSn; }
                set { _orderSn = value; }
            }
            [DBColumnAttr("ProductMaterialCode")]
            public String ProductMaterialCode
            {
                get { return _productMaterialCode; }
                set { _productMaterialCode = value; }
            }

            [DBColumnAttr("ProductName")]
            public String ProductName
            {
                get { return _productName; }
                set { _productName = value; }
            }
            [DBColumnAttr("ProductSpec")]
            public String ProductSpec
            {
                get { return _productSpec; }
                set { _productSpec = value; }
            }
            [DBColumnAttr("Qty")]
            public int  Qty
            {
                get { return _qty; }
                set { _qty = value; }
            }

            [DBColumnAttr("SuggestionDeliveryDate")]
            public Object SuggestionDeliveryDate
            {
                get { return _suggestionDeliveryDate; }
                set { _suggestionDeliveryDate = value; }
            }
            [DBColumnAttr("ConfirmDate")]
            public Object ConfirmDate
            {
                get { return _confirmDate; }
                set { _confirmDate = value; }
            }
            [DBColumnAttr("IsConfirm")]
            public bool  IsConfirm
            {
                get { return _isConfirm; }
                set { _isConfirm = value; }
            }
            [DBColumnAttr("Confirmer")]
            public String Confirmer
            {
                get { return _confirmer; }
                set { _confirmer = value; }
            }



            private int _orderItemId;
            private String _orderSn;
            private String _productMaterialCode;
            private String _productName;
            private String _productSpec;
            private int _qty;
            private Object _suggestionDeliveryDate;
            private Object _confirmDate;
            private bool _isConfirm;
            private String _confirmer;

        }
        #endregion

    }

master的数据源也是一个myCollection对象 : _orders

//获取并帮定master数据源的代码
try
            {
                orderItem ot = _orderBiz.GetOrderInfoByOrderSn(ordersn, true);
                _orders.Add(ot);
                //MessageBox.Show(_orders.Count.ToString());
                gridControl1.DataSource = _orders;
                gridControl1.RefreshDataSource();
                

            }
            catch (Exception ex)
            {

                MessageBox.Show(String.Format(" 出错: {0}",ex.Message) );
            }

detail数据源则是_orders[i] ,它本身也是一个Collection对象.

先用设计器把想显示的数据列设计好


gridControls 都必然有一个MainView,主视图,你可以通过设计器修改主视图,我就设定gridView1为它的主视图(见上图).

接着通过Create a new level 来创建一个新级别,所有的级别都比MainView至少低一个级别.

我把第二级别定义为orderItems而它使用orderDetail视图来实现数据.

MasterRowGetRelationCount  这个事件只要定义e.RelationCount = 2; 就可以了,这样在界面上才可以看到数据前有+号.

这个事件主要是定义gridView1的关联级别是那一个(注意是orderItems,而不是orderDetail)

        private void gridView1_MasterRowGetRelationName(object sender, DevExpress.XtraGrid.Views.Grid.MasterRowGetRelationNameEventArgs e)
        {
            e.RelationName = "orderItems";
        }

 private void gridView1_MasterRowGetChildList(object sender, DevExpress.XtraGrid.Views.Grid.MasterRowGetChildListEventArgs e)
        {



            e.ChildList = (Fiberxon.DataAccess.myCollectionBase)_orders[gridView1.GetDataSourceRowIndex(e.RowHandle)];

//为什么不是下面这个?大家考虑一下(提示:排序.)
//   e.ChildList = (Fiberxon.DataAccess.myCollectionBase)_orders[e.RowHandle];

        }

private void gridView1_MasterRowEmpty(object sender, DevExpress.XtraGrid.Views.Grid.MasterRowEmptyEventArgs e)
        {
//没有这个,则+号是虚的,无法点开
            e.IsEmpty = false;
            
        }

完成了.运行试试看.