Do you have any data to show a primary structure in DataGrid in actual work? If you are familiar with ADO.NET and SQL Server 2000, we will give this goal with the sample database northwind and vb.net that comes with VS.NET comes with VS.NET.
First, let's first prepare data to be displayed.
Below is the contents of the VB.NET code file hierarchicalDataGrid.aspx.vb to hierarchicalDataGrid.aspx:
Imports System.Data.SqlClientPublic Class HierarchicalDataGridInherits System.Web.UI.PageProtected WithEvents DataGrid1 As System.Web.UI.WebControls.DataGrid # Region "Web Form Designer Generated Code" 'The following call to the Web Form Designer is a must Private Sub InitializeComponent () End SubPrivate Sub Page_Init (ByVal sender as System.Object, ByVal e as System.EventArgs) Handles MyBase.Init'CODEGEN: this method is called for the Web Form Designer 'Do not change the code editor used here .InitializeComponent () End Sub # End RegionPrivate Sub Page_Load (ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load' open database Connectivity Dim OrdersConnection As New SqlConnection ( "Server = (local) / NetSDK; Database = northwind; Trusted_Connection = yes ") 'to give orders and order details Dim OrderAdapter As New SqlDataAdapter (" Select * from orders; select OrderID, Products.ProductName, [order Details] .Unitprice, [ Order Details] .quantity, [Order Details] .discount from [Order Details], Products Where [Order Details] .productId = Products.ProductID ", OrDersConnection)" creates and Fill DataSet Objects Dim ORDERDATASET AS New DataSet () OrderaDApter.Fill (ORDERDATASET) 'Settings Table Name ORDERDATASET.TABLES (0) .tablename = "Orders" OrderDataSet.Tables (1) .tablename = "Order Details" is based on ORDERID Establishing a parent child relationship between the two tables of the field DIM PARENT AS DATACOLUMN = OrderDataSet.Tables ("OrderID") Dim Child as Datacolumn = OrderDataSet.Tables ("Order Details"). Columns ("OrderID"). Columns ("ORDERID" ) Dim OrderRelation as DataRelation = New DataRelation ( "OrderRelation", Parent, Child, False) 'is added to the relationship OrderDataSet.Relations.Add DataSet (OrderRelation)' is bound to the DataGrid Orders table DataGrid1.DataSource = OrderDataSet.Tables ( "Orders "
) .DefaultViewDataBind () End SubPrivate Sub DataGrid1_ItemDataBound (ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles DataGrid1.ItemDataBounde.Item.Cells (0) .BackColor = System.Drawing.Color.IvoryEnd SubEnd Class In HierarchicalDataGrid.aspx, we build template columns for DataGrid1 and embed another DataGrid into this template column, and parent-level DataGrid is used to display master records, such as: Order. The child level DataGrid is used to display details, such as the details of the order. We use this to dynamically specify data sources for sub-DataGrid:
DataSource = '<% # ctype (container.DataItem, DataRowView) .createchildview ("ORDERRELATION")%>>>
The above sentence is to achieve the key to displaying the main secondary data. Depending on the current parent-level record, DataRowView.createChildView uses the name of the relationship created in front as a parameter to obtain sub-record and bind it to the sub-DataGrid.
Below is the code of the ASPX page we have to display, hierarchicalDataGrid.aspx:
<% @ Page Language = "vb" AutoEventWireup = "false" Codebehind = "HierarchicalDataGrid.aspx.vb" Inherits = "HierarchicalDataGrid.HierarchicalDataGrid"%> <% @ Import namespace = "System.Data"%>
Display the example of the host sub-relational data </ title> <meta name = "content =" Microsoft Visual Studio. NET 7.0 "> <meta name =" CODE_LANGUAGE "content =" Visual Basic 7.0 "> <meta name =" vs_defaultClientScript "content =" JavaScript "> <meta name =" vs_targetSchema "content =" http://schemas.microsoft. COM / IntelliSense / IE5 "> </ head> <body> <form id =" frMdataGrid "method =" post "runat =" server "> <p align =" center "> <ask: DataGrid ID =" DataGrid1 "BorderColor = "# 0099FF" runat = "server" ShowHeader = "False" Width = "470px" CellPadding = "0" CellSpacing = "0" AutoGenerateColumns = "False" BorderWidth = "2px"> <Columns> <asp: TemplateColumn> < ItemTemplate> <Table cellspacing = "0" cellpadding = "0" width = "100%" border = "0"> <tr> <td bgcolor = "# ff6600"> <b> order number: <% # databinder.eval (Container.DataItem, "ORDERID")%> </ b> </ t D> </ tr> <tr> <td align = "right"> <ask: DataGrid ID = DataGrid2 runat = "server" autogeneratecolumns = "false" bordercolor = "</p>
<p># 33FF33 "DataKeyField =" OrderID "DataSource = '<% # Ctype (Container.DataItem, DataRowView) .CreateChildView (" OrderRelation ")%>'> <HeaderStyle Font-Bold =" True "ForeColor =" # CC0066 "BackColor = "#Ffccff"> </ headerstyle> <columns> <asp: boundcolumn visible = "false" datafield = "orderid" readonly = "true"> </ asp: boundcolumn> <ask: templatecolumn headertext = Product Name> < HeaderStyle Width = "300px"> </ HeaderStyle> <ItemTemplate> <% # DataBinder.Eval (Container.DataItem, "ProductName")%> </ ItemTemplate> </ asp: TemplateColumn> <asp: BoundColumn DataField = "UnitPrice" Headertext = "Unit"> </ asp: boundcolumn> <ask: BoundColumn DataField = "Quantity" Headertext = "Quantity"> </ asp: boundcolumn> <ask: BoundColumn DataField = "discount" Headeertext = "Discount"> </ ASP: BoundColumn> </ columns> </ ask: dataGrid> </ td> </ tr> </ table> </ itemtemplate> </ ask: templateColumn> </ columns> </ asp: datagrid> </ p> </ form> </ body> </ html> Create a VB.NET ASPX application named HierarchicalDataGrid in VS.NET, enter the result of the above:</p></div><div class="text-center mt-3 text-grey">
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