[C#.NET][ASP.NET] Use ObjectDataSource of Session Achieve Master-Detail at GridView

2014-11-23

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ObjectDataSource
2015-12-28

續上篇，http://www.dotblogs.com.tw/yc421206/archive/2014/11/13/147293.aspx

上篇演練了 ObjectDataSource Binding，本篇要演練 Master-Detail

首先建立資料結構，Order、OrderItem，Order.GetOrders 靜態方法用來建立 Order 集合(假資料)

完整程式碼如下：

https://dotblogsamples.codeplex.com/SourceControl/latest#Simple.ObjectDataSourceSession/Simple.ObjectDataSourceSession/Models/Order.cs

https://dotblogsamples.codeplex.com/SourceControl/latest#Simple.ObjectDataSourceSession/Simple.ObjectDataSourceSession/Models/OrderItem.cs

然後準備 OrderUseCase 類別讓 ObjectDataSource 接收，實作步驟參考以下：

http://www.dotblogs.com.tw/yc421206/archive/2014/11/13/147293.aspx#@EmployeeDataAccess.cs%EF%BC%8C%E8%A8%AD%E5%AE%9A%20DAO%20%E7%89%A9%E4%BB%B6

完整程式碼如下：

https://dotblogsamples.codeplex.com/SourceControl/latest#Simple.ObjectDataSourceSession/Simple.ObjectDataSourceSession/Controls/OrderUseCase.cs

UI規劃如下圖：

Order_ObjectDataSource.SelectMethod="GetAllOrders”

OrderItem_ObjectDataSource.SelectMethod="GetAllOrderItems”

Order_GridView 綁定 Order_ObjectDataSource

OrderItem_GridView 綁定 OrderItem_ObjectDataSource

@Order_ObjectDataSource

這部份的設定跟上篇相同，在這篇就不再贅述

@OrderItem_ObjectDataSource

比較不一樣的是，當 ObjectDataSource 選擇了帶有參數的方法，就會跳出以下視窗，在這裡我選用 Session，定義 SessionField=”SESSION_CURRENT_ORDER”

@WebForm1.aspx

在設計工具設定好 Order_ObjectDataSource & OrderItem_ObjectDataSource 後，VS2013 就幫我產生以下

SessionParameter Name 就是 OrderUseCase.GetAllOrderItems 方法裡的參數名稱

SessionField 就是 Session Name，接下來我們需要手動處理 Session

<asp:ObjectDataSource ID="Order_ObjectDataSource" runat="server" OldValuesParameterFormatString="original_{0}"
    SelectMethod="GetAllOrders"
    TypeName="Simple.ObjectDataSourceSession.Controls.OrderUseCase"></asp:ObjectDataSource>
<asp:ObjectDataSource ID="OrderItem_ObjectDataSource" runat="server" OldValuesParameterFormatString="original_{0}"
    SelectMethod="GetAllOrderItems"
    TypeName="Simple.ObjectDataSourceSession.Controls.OrderUseCase">
    <SelectParameters>
        <asp:SessionParameter Name="orderNo" SessionField="SESSION_CURRENT_ORDER" DbType="Guid" />
    </SelectParameters>
</asp:ObjectDataSource>

完整程式碼如下：

https://dotblogsamples.codeplex.com/SourceControl/latest#Simple.ObjectDataSourceSession/Simple.ObjectDataSourceSession/Views/WebForm1.aspx

點選 Master 資料列，改變 Detail

當我在 Order_GridView(Master) 選擇任何一筆資料時，我需要觸發 Order_GridView_SelectedIndexChanged 事件，它用來取得選擇列的 orderNo，並將取得結果存放至 Session["SESSION_CURRENT_ORDER"]

@WebForm1.aspx.cs

我將會用到 Order_GridView.SelectValue 屬性，所以需要設定 Order_GridView.DataKeyNames 屬性

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        //GridView要定義DataKeyNames，SelectValue屬性才會有資料
        this.Order_GridView.DataKeyNames = new[] { "OrderNo" };
    }
}

Order_GridView.SelectValue 只適合處理一個欄位，若需要處理多個欄位，就要利用 Order_GridView.SelectRow 來處理

protected void Order_GridView_SelectedIndexChanged(object sender, EventArgs e)
{
    if (sender is GridView == false)
    {
        return;
    }
    var gridView = (GridView)sender;
    //SelectValue不支援多欄位
    var selectGuid = gridView.SelectedValue;
    this.Session["SESSION_CURRENT_ORDER"] = selectGuid;

    //var selectRow = gridView.SelectedRow;
    //var orderNo = selectRow.Cells[0].Text;
    //this.Session["SESSION_CURRENT_ORDER"] = orderNo;
}

完整程式碼如下：

https://dotblogsamples.codeplex.com/SourceControl/latest#Simple.ObjectDataSourceSession/Simple.ObjectDataSourceSession/Views/WebForm1.aspx.cs

@WebForm1.aspx

<asp:GridView ID="Order_GridView" runat="server" AutoGenerateColumns="False" DataSourceID="Order_ObjectDataSource" 
    OnSelectedIndexChanged="Order_GridView_SelectedIndexChanged">
    <Columns>
        <asp:CommandField ShowSelectButton="True" />
        <asp:BoundField DataField="OrderNo" HeaderText="OrderNo" SortExpression="OrderNo" />
        <asp:BoundField DataField="OrderDate" HeaderText="OrderDate" SortExpression="OrderDate" />
        <asp:BoundField DataField="SupplierId" HeaderText="SupplierId" SortExpression="SupplierId" />
        <asp:BoundField DataField="SupplierName" HeaderText="SupplierName" SortExpression="SupplierName" />
    </Columns>
</asp:GridView>

完整程式碼如下：

https://dotblogsamples.codeplex.com/SourceControl/latest#Simple.ObjectDataSourceSession/Simple.ObjectDataSourceSession/Views/WebForm1.aspx

完成後便完成 Master-Detail 連動

文章出自：http://www.dotblogs.com.tw/yc421206/archive/2014/11/23/147393.aspx

範例下載：https://dotblogsamples.codeplex.com/SourceControl/latest#Simple.ObjectDataSourceSession/

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