GridViewRow.DataItem 属性
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
获取将 GridViewRow 对象绑定到的基础数据对象。
public:
virtual property System::Object ^ DataItem { System::Object ^ get(); void set(System::Object ^ value); };public virtual object DataItem { get; set; }member this.DataItem : obj with get, setPublic Overridable Property DataItem As Object属性值
Object，它表示将 GridViewRow 对象绑定到的基础数据对象。
示例
以下示例演示如何使用 DataItem 属性检索字段值。 然后，该值用于在行处于编辑模式时显示的控件中 DropDownList 预先选择项。
<%@ Page language="C#" %>
<%@ import namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void AuthorsGridView_RowDataBound (Object sender, GridViewRowEventArgs e)
{
// Check for a row in edit mode.
if(e.Row.RowState == DataControlRowState.Edit)
{
// Preselect the DropDownList control with the state value
// for the current row.
// Retrieve the underlying data item. In this example
// the underlying data item is a DataRowView object.
DataRowView rowView = (DataRowView)e.Row.DataItem;
// Retrieve the state value for the current row.
String state = rowView["state"].ToString();
// Retrieve the DropDownList control from the current row.
DropDownList list = (DropDownList)e.Row.FindControl("StatesList");
// Find the ListItem object in the DropDownList control with the
// state value and select the item.
ListItem item = list.Items.FindByText(state);
list.SelectedIndex = list.Items.IndexOf(item);
}
}
void AuthorsGridView_RowUpdating(Object sender, GridViewUpdateEventArgs e)
{
// Retrieve the row being edited.
GridViewRow row = AuthorsGridView.Rows[AuthorsGridView.EditIndex];
// Retrieve the DropDownList control from the row.
DropDownList list = (DropDownList)row.FindControl("StatesList");
// Add the selected value of the DropDownList control to
// the NewValues collection. The NewValues collection is
// passed to the data source control, which then updates the
// data source.
e.NewValues["state"] = list.SelectedValue;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewRow DataItem Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewRow DataItem Example</h3>
<asp:gridview id="AuthorsGridView"
datasourceid="AuthorsSqlDataSource"
autogeneratecolumns="false"
autogenerateeditbutton="true"
datakeynames="au_id"
onrowdatabound="AuthorsGridView_RowDataBound"
onrowupdating="AuthorsGridView_RowUpdating"
runat="server">
<columns>
<asp:boundfield datafield="au_lname"
headertext="Last Name"/>
<asp:boundfield datafield="au_fname"
headertext="First Name"/>
<asp:templatefield headertext="State">
<itemtemplate>
<%#Eval("state")%>
</itemtemplate>
<edititemtemplate>
<asp:dropdownlist id="StatesList"
datasourceid="StatesSqlDataSource"
datatextfield="state"
runat="server"/>
<asp:sqldatasource id="StatesSqlDataSource"
selectcommand="SELECT Distinct [state] FROM [authors]"
connectionstring="server=localhost;database=pubs;integrated security=SSPI"
runat="server">
</asp:sqldatasource>
</edititemtemplate>
</asp:templatefield>
</columns>
</asp:gridview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Pubs sample database. -->
<asp:sqldatasource id="AuthorsSqlDataSource"
selectcommand="SELECT [au_id], [au_lname], [au_fname], [state] FROM [authors]"
updatecommand="UPDATE authors SET [au_lname]=@au_lname, [au_fname]=@au_fname, [state]=@state WHERE au_id=@au_id"
connectionstring="server=localhost;database=pubs;integrated security=SSPI"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
<%@ Page language="VB" %>
<%@ import namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub AuthorsGridView_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
' Check for a row in edit mode.
If e.Row.RowState = DataControlRowState.Edit Then
' Preselect the DropDownList control with the state value
' for the current row.
' Retrieve the underlying data item. In this example
' the underlying data item is a DataRowView object.
Dim rowView As DataRowView = CType(e.Row.DataItem, DataRowView)
' Retrieve the state value for the current row.
Dim state As String = rowView("state").ToString()
' Retrieve the DropDownList control from the current row.
Dim list As DropDownList = CType(e.Row.FindControl("StatesList"), DropDownList)
' Find the ListItem object in the DropDownList control with the
' state value and select the item.
Dim item As ListItem = list.Items.FindByText(state)
list.SelectedIndex = list.Items.IndexOf(item)
End If
End Sub
Sub AuthorsGridView_RowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs)
' Retrieve the row being edited.
Dim row As GridViewRow = AuthorsGridView.Rows(AuthorsGridView.EditIndex)
' Retrieve the DropDownList control from the row.
Dim list As DropDownList = CType(row.FindControl("StatesList"), DropDownList)
' Add the selected value of the DropDownList control to
' the NewValues collection. The NewValues collection is
' passed to the data source control, which then updates the
' data source.
e.NewValues("state") = list.SelectedValue
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewRow DataItem Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewRow DataItem Example</h3>
<asp:gridview id="AuthorsGridView"
datasourceid="AuthorsSqlDataSource"
autogeneratecolumns="false"
autogenerateeditbutton="true"
datakeynames="au_id"
onrowdatabound="AuthorsGridView_RowDataBound"
onrowupdating="AuthorsGridView_RowUpdating"
runat="server">
<columns>
<asp:boundfield datafield="au_lname"
headertext="Last Name"/>
<asp:boundfield datafield="au_fname"
headertext="First Name"/>
<asp:templatefield headertext="State">
<itemtemplate>
<%#Eval("state")%>
</itemtemplate>
<edititemtemplate>
<asp:dropdownlist id="StatesList"
datasourceid="StatesSqlDataSource"
datatextfield="state"
runat="server"/>
<asp:sqldatasource id="StatesSqlDataSource"
selectcommand="SELECT Distinct [state] FROM [authors]"
connectionstring="server=localhost;database=pubs;integrated security=SSPI"
runat="server">
</asp:sqldatasource>
</edititemtemplate>
</asp:templatefield>
</columns>
</asp:gridview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Pubs sample database. -->
<asp:sqldatasource id="AuthorsSqlDataSource"
selectcommand="SELECT [au_id], [au_lname], [au_fname], [state] FROM [authors]"
updatecommand="UPDATE authors SET [au_lname]=@au_lname, [au_fname]=@au_fname, [state]=@state WHERE au_id=@au_id"
connectionstring="server=localhost;database=pubs;integrated security=SSPI"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
注解
DataItem使用 属性可以访问对象绑定到的基础数据GridViewRow对象的属性。 属性DataItem仅在 控件事件GridView期间和之后RowDataBound可用。
注意
此属性仅适用于数据行。
