添加一个CheckBox列到DataGrid

最新推荐文章于 2022-02-02 14:05:02 发布

zhanghe100

最新推荐文章于 2022-02-02 14:05:02 发布

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分类专栏： asp.net 文章标签： datagrid object assembly string class each

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本文介绍如何在DataGrid中添加复选框列，并提供了一个可重用的CheckBoxColumn类，该类允许用户选择多行并获取所选行的索引及数据键。

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DataGrid中添加个复选框

决定做一个可重用的控制，将增加一个复选框DataGrid 。

<%@ Register TagPrefix="chkbox" Namespace="DataGridControls" Assembly="DataGridCheckbox" %>

然后添加复选框列到DataGrid ：

<asp:DataGrid ID="dgTestGrid" Runat="server" AutoGenerateColumns=True border="0" width="50%"> <Columns> <chkbox:CheckBoxColumn/> </Columns> </asp:DataGrid>

该CheckBoxColumn类相当简单：

using System; using System.Collections; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; namespace DataGridControls { /// <summary> /// CheckBoxColumn Derives from DataGrid Column /// </summary> public class CheckBoxColumn : DataGridColumn { public CheckBoxColumn(): base() { } public override void InitializeCell(TableCell cell, int columnIndex, ListItemType itemType) { //let the base class initialize the cell base.InitializeCell(cell, columnIndex, itemType); //we don't want to add a checkbox to the header. if( itemType == ListItemType.EditItem || itemType == ListItemType.Item || itemType == ListItemType.AlternatingItem || itemType == ListItemType.SelectedItem){ HtmlInputCheckBox checkbox = new HtmlInputCheckBox(); //assign an ID that we can use to find the control later checkbox.ID = "checkboxCol"; cell.Controls.Add(checkbox); } } public Int32[] SelectedIndexes { get { ArrayList selectedIndexList = new ArrayList(); //iterate each DataGridItem and find our checkbox foreach( DataGridItem item in this.Owner.Items ) { HtmlInputCheckBox chkBox = (HtmlInputCheckBox) item.FindControl("checkboxCol"); //If it's selected then add it to our ArrayList if ( chkBox != null && chkBox.Checked ) { selectedIndexList.Add( item.ItemIndex ); } } return (Int32[])selectedIndexList.ToArray(typeof( System.Int32 ) ); } } public object[] SelectedDataKeys { get { //Just iterate each of the selectedindexes and //match it up to the datakey field ArrayList dataKeyList = new ArrayList(); //make sure the datakeys have some values if(this.Owner.DataKeys.Count > 0) { foreach( Int32 selectedIndex in SelectedIndexes ) { object DataKey = (this.Owner.DataKeys[selectedIndex].ToString()); dataKeyList.Add(DataKey); } } return (object[])dataKeyList.ToArray(typeof( object ) ); } } } }

2个属性：

SelectedDataKeys:返回一个ArrayList使用DataKey值

SelectedIndexes: Returns an Int32 [] with the selectedIndex values SelectedIndexes:返回一个Int32 []与selectedIndex值
要找出复选框被选中：

//On our button's Onclick protected void btnSubmit_Click(object sender, EventArgs e) { //Get our checkboxcolumn, we know it's position is 0 CheckBoxColumn chkbox = (CheckBoxColumn) dgTestGrid.Columns[0]; foreach(object datakeyfield in chkbox.SelectedDataKeys) { Response.Write(datakeyfield.ToString() + "<br>"); } }

这几乎是它的DataKeyField的DataGrid可以是任何类型。 The sample I've included binds a DataTable to the DataGrid , you can change the DataKeyField from " ID " ( int ) to " Name " ( string ) to see the code working with different types.所包含的示例中，我已经绑定了一个DataTable到DataGrid ，你可以改变DataKeyField由“ ID “（ int ），以“ Name “（ string ）来查看代码类型使用不同的。