DataGrid.EditItemIndex Propiedad
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
Obtiene o establece el índice de un elemento del control DataGrid para su edición.
public:
virtual property int EditItemIndex { int get(); void set(int value); };public virtual int EditItemIndex { get; set; }member this.EditItemIndex : int with get, setPublic Overridable Property EditItemIndex As IntegerValor de propiedad
Índice de un elemento del control DataGrid para su edición. El valor predeterminado es -1, que indica que no se está editando ningún elemento del control DataGrid.
Excepciones
El índice especificado es menor que -1.
Ejemplos
En el ejemplo de código siguiente se muestra cómo usar la EditItemIndex propiedad para determinar el elemento seleccionado para su edición en el DataGrid control .
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script language="C#" runat="server">
DataTable Cart = new DataTable();
DataView CartView;
void Page_Load(Object sender, EventArgs e)
{
DataRow dr;
if (Session["ShoppingCart"] == null)
{
Cart.Columns.Add(new DataColumn("Qty", typeof(String)));
Cart.Columns.Add(new DataColumn("Item", typeof(String)));
Cart.Columns.Add(new DataColumn("Price", typeof(String)));
Session["ShoppingCart"] = Cart;
// Create sample data.
for (int i = 1; i <= 4; i++)
{
dr = Cart.NewRow();
if (i % 2 != 0)
dr[0] = "2";
else
dr[0] = "1";
dr[1] = "Item " + i.ToString();
dr[2] = (1.23 * (i + 1)).ToString();
Cart.Rows.Add(dr);
}
}
else
Cart = (DataTable)Session["ShoppingCart"];
CartView = new DataView(Cart);
CartView.Sort="Item";
if (!IsPostBack)
BindGrid();
}
void MyDataGrid_Edit(Object sender, DataGridCommandEventArgs e)
{
MyDataGrid.EditItemIndex = e.Item.ItemIndex;
BindGrid();
}
void MyDataGrid_Cancel(Object sender, DataGridCommandEventArgs e)
{
MyDataGrid.EditItemIndex = -1;
BindGrid();
}
void MyDataGrid_Update(Object sender, DataGridCommandEventArgs e)
{
// For bound columns, the edited value is stored in a TextBox.
// The TextBox is the 0th element in the column's cell.
TextBox qtyText = (TextBox)e.Item.Cells[2].Controls[0];
TextBox priceText = (TextBox)e.Item.Cells[3].Controls[0];
String item = e.Item.Cells[1].Text;
String qty = qtyText.Text;
String price = priceText.Text;
DataRow dr;
// With a database, use an update command to update the data. Because
// the data source in this example is an in-memory DataTable, delete the
// old row and replace it with a new one.
// Remove old entry.
CartView.RowFilter = "Item='" + item + "'";
if (CartView.Count > 0)
CartView.Delete(0);
CartView.RowFilter = "";
// Add new entry.
dr = Cart.NewRow();
dr[0] = qty;
dr[1] = item;
dr[2] = price;
Cart.Rows.Add(dr);
MyDataGrid.EditItemIndex = -1;
BindGrid();
}
void BindGrid()
{
MyDataGrid.DataSource = CartView;
MyDataGrid.DataBind();
}
</script>
<head runat="server">
<title>DataGrid Editing Example</title>
</head>
<body style="font: 10pt verdana">
<form id="form1" runat="server">
<h3>DataGrid Editing Example</h3>
<asp:DataGrid id="MyDataGrid" runat="server"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
Font-Names="Verdana"
Font-Size="8pt"
OnEditCommand="MyDataGrid_Edit"
OnCancelCommand="MyDataGrid_Cancel"
OnUpdateCommand="MyDataGrid_Update"
AutoGenerateColumns="false">
<HeaderStyle BackColor="#aaaadd">
</HeaderStyle>
<Columns>
<asp:EditCommandColumn
EditText="Edit"
CancelText="Cancel"
UpdateText="Update"
HeaderText="Edit Command Column">
<ItemStyle Wrap="false">
</ItemStyle>
<HeaderStyle Wrap="false">
</HeaderStyle>
</asp:EditCommandColumn>
<asp:BoundColumn HeaderText="Item"
ReadOnly="true"
DataField="Item"/>
<asp:BoundColumn HeaderText="Quantity"
DataField="Qty"/>
<asp:BoundColumn HeaderText="Price"
DataField="Price"/>
</Columns>
</asp:DataGrid>
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script language="VB" runat="server">
Dim Cart As New DataTable
Dim CartView As DataView
Sub Page_Load(sender As Object, e As EventArgs)
Dim dr As DataRow
If Session("ShoppingCart") Is Nothing Then
Cart.Columns.Add(New DataColumn("Qty", GetType(String)))
Cart.Columns.Add(New DataColumn("Item", GetType(String)))
Cart.Columns.Add(New DataColumn("Price", GetType(String)))
Session("ShoppingCart") = Cart
' Create sample data.
Dim i As Integer
For i = 1 To 4
dr = Cart.NewRow()
If i Mod 2 <> 0 Then
dr(0) = "2"
Else
dr(0) = "1"
End If
dr(1) = "Item " & i.ToString()
dr(2) =(1.23 *(i + 1)).ToString()
Cart.Rows.Add(dr)
Next i
Else
Cart = CType(Session("ShoppingCart"), DataTable)
End If
CartView = New DataView(Cart)
CartView.Sort = "Item"
If Not IsPostBack Then
BindGrid()
End If
End Sub 'Page_Load
Sub MyDataGrid_Edit(sender As Object, e As DataGridCommandEventArgs)
MyDataGrid.EditItemIndex = e.Item.ItemIndex
BindGrid()
End Sub 'MyDataGrid_Edit
Sub MyDataGrid_Cancel(sender As Object, e As DataGridCommandEventArgs)
MyDataGrid.EditItemIndex = - 1
BindGrid()
End Sub 'MyDataGrid_Cancel
Sub MyDataGrid_Update(sender As Object, e As DataGridCommandEventArgs)
' For bound columns, the edited value is stored in a TextBox.
' The TextBox is the 0th element in the column's cell.
Dim qtyText As TextBox = CType(e.Item.Cells(2).Controls(0), TextBox)
Dim priceText As TextBox = CType(e.Item.Cells(3).Controls(0), TextBox)
Dim item As String = e.Item.Cells(1).Text
Dim qty As String = qtyText.Text
Dim price As String = priceText.Text
Dim dr As DataRow
' With a database, use an update command to update the data. Because
' the data source in this example is an in-memory DataTable, delete the
' old row and replace it with a new one.
CartView.RowFilter = "Item='" & item & "'"
If CartView.Count > 0 Then
CartView.Delete(0)
End If
CartView.RowFilter = ""
' Add new entry.
dr = Cart.NewRow()
dr(0) = qty
dr(1) = item
dr(2) = price
Cart.Rows.Add(dr)
MyDataGrid.EditItemIndex = - 1
BindGrid()
End Sub 'MyDataGrid_Update
Sub BindGrid()
MyDataGrid.DataSource = CartView
MyDataGrid.DataBind()
End Sub 'BindGrid
</script>
<head runat="server">
<title>DataGrid Editing Example</title>
</head>
<body style="font: 10pt verdana">
<form id="form1" runat="server">
<h3>DataGrid Editing Example</h3>
<asp:DataGrid id="MyDataGrid" runat="server"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
Font-Names="Verdana"
Font-Size="8pt"
OnEditCommand="MyDataGrid_Edit"
OnCancelCommand="MyDataGrid_Cancel"
OnUpdateCommand="MyDataGrid_Update"
AutoGenerateColumns="false">
<HeaderStyle BackColor="#aaaadd">
</HeaderStyle>
<Columns>
<asp:EditCommandColumn
EditText="Edit"
CancelText="Cancel"
UpdateText="Update"
HeaderText="Edit Command Column">
<ItemStyle Wrap="false">
</ItemStyle>
<HeaderStyle Wrap="false">
</HeaderStyle>
</asp:EditCommandColumn>
<asp:BoundColumn HeaderText="Item"
ReadOnly="true"
DataField="Item"/>
<asp:BoundColumn HeaderText="Quantity"
DataField="Qty"/>
<asp:BoundColumn HeaderText="Price"
DataField="Price"/>
</Columns>
</asp:DataGrid>
</form>
</body>
</html>
Comentarios
Utilice la EditItemIndex propiedad cuando el DataGrid control contiene un EditCommandColumn para determinar el índice del elemento seleccionado en el DataGrid control que se va a editar.
Esta propiedad también se usa para controlar mediante programación qué elemento se está editando. Al establecer esta propiedad en un índice de un elemento del DataGrid control, se habilitarán los controles de edición de ese elemento en .EditCommandColumn
Nota
La EditItemIndex propiedad está basada en cero.
Para cancelar la edición, establezca mediante programación esta propiedad en -1.
Precaución
El texto no está codificado en HTML antes de que se muestre en el DataGrid control . Esto permite insertar script dentro de etiquetas HTML en el texto. Si los valores del control proceden de la entrada del usuario, asegúrese de validar los valores para reducir las vulnerabilidades de seguridad.