GridViewCommandEventArgs 事件参数没有包含用于指示单击按钮所在行的属性?
2006-08-05 20:55 晓风残月 阅读(2329) 评论(1) 编辑 收藏 举报datagrid、datalist、repeat的ItemCommand 事件参数都有一个Item属性可以得到激发当前事件控件所在行,但是GridView的GridViewCommandEventArgs 却没有这个属性
不过,MSDN也说明了解决方案:
注意 |
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GridViewCommandEventArgs 类未包含一个用于指示单击按钮所在行的属性。如果需要知道哪个行引发了事件,请使用 CommandArgument 属性将行的索引传给事件处理方法。 |
<%@ Page language="C#" %>
<script runat="server">
void CustomersGridView_RowCommand(Object sender, GridViewCommandEventArgs e)
{
// If multiple buttons are used in a GridView control, use the
// CommandName property to determine which button was clicked.
if(e.CommandName=="Add")
{
// Convert the row index stored in the CommandArgument
// property to an Integer.
int index = Convert.ToInt32(e.CommandArgument);
// Retrieve the row that contains the button clicked
// by the user from the Rows collection.
GridViewRow row = CustomersGridView.Rows[index];
// Create a new ListItem object for the customer in the row.
ListItem item = new ListItem();
item.Text = Server.HtmlDecode(row.Cells[2].Text);
// If the customer is not already in the ListBox, add the ListItem
// object to the Items collection of the ListBox control.
if (!CustomersListBox.Items.Contains(item))
{
CustomersListBox.Items.Add(item);
}
}
}
void CustomersGridView_RowCreated(Object sender, GridViewRowEventArgs e)
{
// The GridViewCommandEventArgs class does not contain a
// property that indicates which row's command button was
// clicked. To identify which row's button was clicked, use
// the button's CommandArgument property by setting it to the
// row's index.
if(e.Row.RowType == DataControlRowType.DataRow)
{
// Retrieve the LinkButton control from the first column.
LinkButton addButton = (LinkButton)e.Row.Cells[0].Controls[0];
// Set the LinkButton's CommandArgument property with the
// row's index.
addButton.CommandArgument = e.Row.RowIndex.ToString();
}
}
</script>
<html>
<body>
<form runat="server">
<h3>GridView RowCommand Example</h3>
<table width="100%">
<tr>
<td width="50%">
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSource"
allowpaging="true"
autogeneratecolumns="false"
onrowcommand="CustomersGridView_RowCommand"
onrowcreated="CustomersGridView_RowCreated"
runat="server">
<columns>
<asp:buttonfield buttontype="Link"
commandname="Add"
text="Add"/>
<asp:boundfield datafield="CustomerID"
headertext="Customer ID"/>
<asp:boundfield datafield="CompanyName"
headertext="Company Name"/>
<asp:boundfield datafield="City"
headertext="City"/>
</columns>
</asp:gridview>
</td>
<td valign="top" width="50%">
Customers: <br/>
<asp:listbox id="CustomersListBox"
runat="server"/>
</td>
</tr>
</table>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:sqldatasource id="CustomersSource"
selectcommand="Select [CustomerID], [CompanyName], [City] From [Customers]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
<script runat="server">
void CustomersGridView_RowCommand(Object sender, GridViewCommandEventArgs e)
{
// If multiple buttons are used in a GridView control, use the
// CommandName property to determine which button was clicked.
if(e.CommandName=="Add")
{
// Convert the row index stored in the CommandArgument
// property to an Integer.
int index = Convert.ToInt32(e.CommandArgument);
// Retrieve the row that contains the button clicked
// by the user from the Rows collection.
GridViewRow row = CustomersGridView.Rows[index];
// Create a new ListItem object for the customer in the row.
ListItem item = new ListItem();
item.Text = Server.HtmlDecode(row.Cells[2].Text);
// If the customer is not already in the ListBox, add the ListItem
// object to the Items collection of the ListBox control.
if (!CustomersListBox.Items.Contains(item))
{
CustomersListBox.Items.Add(item);
}
}
}
void CustomersGridView_RowCreated(Object sender, GridViewRowEventArgs e)
{
// The GridViewCommandEventArgs class does not contain a
// property that indicates which row's command button was
// clicked. To identify which row's button was clicked, use
// the button's CommandArgument property by setting it to the
// row's index.
if(e.Row.RowType == DataControlRowType.DataRow)
{
// Retrieve the LinkButton control from the first column.
LinkButton addButton = (LinkButton)e.Row.Cells[0].Controls[0];
// Set the LinkButton's CommandArgument property with the
// row's index.
addButton.CommandArgument = e.Row.RowIndex.ToString();
}
}
</script>
<html>
<body>
<form runat="server">
<h3>GridView RowCommand Example</h3>
<table width="100%">
<tr>
<td width="50%">
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSource"
allowpaging="true"
autogeneratecolumns="false"
onrowcommand="CustomersGridView_RowCommand"
onrowcreated="CustomersGridView_RowCreated"
runat="server">
<columns>
<asp:buttonfield buttontype="Link"
commandname="Add"
text="Add"/>
<asp:boundfield datafield="CustomerID"
headertext="Customer ID"/>
<asp:boundfield datafield="CompanyName"
headertext="Company Name"/>
<asp:boundfield datafield="City"
headertext="City"/>
</columns>
</asp:gridview>
</td>
<td valign="top" width="50%">
Customers: <br/>
<asp:listbox id="CustomersListBox"
runat="server"/>
</td>
</tr>
</table>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:sqldatasource id="CustomersSource"
selectcommand="Select [CustomerID], [CompanyName], [City] From [Customers]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
让人非常遗憾的是,为什么ASPNET不提供这个属性,这个属性应该是很常用的,难道是又一个疏忽?
按新版控件GridView的命名习惯,如果提供一个GridViewRow类型的Row属性,对于我们开发人员就方便多了,
省去了手动添加RowIndex,然后还要解析出来,当ComandArg参数多的时候更麻烦
当然对于简单的情况可以使用声名的方式绑定RowIndex,也就不需要在Created事件处理:
<asp:imagebutton skinid="ChangeOrder" commandargument="<%# ((GridViewRow)Container).RowIndex %>" runat="server" id="btnChangeOrder" imageurl="~/Designer/images/updown.gif" causesvalidation="false" commandname="ChangeOrder"/>