DataGrid.EditCommand 事件
http://msdn2.microsoft.com/zh-cn/library/system.web.ui.webcontrols.datagrid.editcommand(VS.80).aspx
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<html>
<script runat="server">
// The Cart and CartView objects temporarily store the data source
// for the DataGrid control while the page is being processed.
DataTable Cart = new DataTable();
DataView CartView;
void Page_Load(Object sender, EventArgs e)
{
// With a database, use an select query to retrieve the data. Because
// the data source in this example is an in-memory DataTable, retrieve
// the data from session state if it exists; otherwise, create the data
// source.
GetSource();
// The DataGrid control maintains state between posts to the server;
// it only needs to be bound to a data source the first time the page
// is loaded or when the data source is updated.
if (!IsPostBack)
{
BindGrid();
}
}
void ItemsGrid_Edit(Object sender, DataGridCommandEventArgs e)
{
// Set the EditItemIndex property to the index of the item clicked
// in the DataGrid control to enable editing for that item. Be sure
// to rebind the DateGrid to the data source to refresh the control.
ItemsGrid.EditItemIndex = e.Item.ItemIndex;
BindGrid();
}
void ItemsGrid_Cancel(Object sender, DataGridCommandEventArgs e)
{
// Set the EditItemIndex property to -1 to exit editing mode.
// Be sure to rebind the DateGrid to the data source to refresh
// the control.
ItemsGrid.EditItemIndex = -1;
BindGrid();
}
void ItemsGrid_Update(Object sender, DataGridCommandEventArgs e)
{
// Retrieve the text boxes that contain the values to update.
// For bound columns, the edited value is stored in a TextBox.
// The TextBox is the 0th control in a cell's Controls collection.
// Each cell in the Cells collection of a DataGrid item represents
// a column in the DataGrid control.
TextBox qtyText = (TextBox)e.Item.Cells[3].Controls[0];
TextBox priceText = (TextBox)e.Item.Cells[4].Controls[0];
// Retrieve the updated values.
String item = e.Item.Cells[2].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 the old entry and clear the row filter.
CartView.RowFilter = "Item='" + item + "'";
if (CartView.Count > 0)
{
CartView.Delete(0);
}
CartView.RowFilter = "";
// ***************************************************************
// Insert data validation code here. Be sure to validate the
// values entered by the user before converting to the appropriate
// data types and updating the data source.
// ***************************************************************
// Add the new entry.
dr = Cart.NewRow();
dr[0] = Convert.ToInt32(qty);
dr[1] = item;
// If necessary, remove the '$' character from the price before
// converting it to a Double.
if(price[0] == '$')
{
dr[2] = Convert.ToDouble(price.Substring(1));
}
else
{
dr[2] = Convert.ToDouble(price);
}
Cart.Rows.Add(dr);
// Set the EditItemIndex property to -1 to exit editing mode.
// Be sure to rebind the DateGrid to the data source to refresh
// the control.
ItemsGrid.EditItemIndex = -1;
BindGrid();
}
void BindGrid()
{
// Set the data source and bind to the Data Grid control.
ItemsGrid.DataSource = CartView;
ItemsGrid.DataBind();
}
void GetSource()
{
// For this example, the data source is a DataTable that is stored
// in session state. If the data source does not exist, create it;
// otherwise, load the data.
if (Session["ShoppingCart"] == null)
{
// Create the sample data.
DataRow dr;
// Define the columns of the table.
Cart.Columns.Add(new DataColumn("Qty", typeof(Int32)));
Cart.Columns.Add(new DataColumn("Item", typeof(String)));
Cart.Columns.Add(new DataColumn("Price", typeof(Double)));
// Store the table in session state to persist its values
// between posts to the server.
Session["ShoppingCart"] = Cart;
// Populate the DataTable with sample data.
for (int i = 1; i <= 9; 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));
Cart.Rows.Add(dr);
}
}
else
{
// Retrieve the sample data from session state.
Cart = (DataTable)Session["ShoppingCart"];
}
// Create a DataView and specify the field to sort by.
CartView = new DataView(Cart);
CartView.Sort="Item";
return;
}
void ItemsGrid_Command(Object sender, DataGridCommandEventArgs e)
{
switch(((LinkButton)e.CommandSource).CommandName)
{
case "Delete":
DeleteItem(e);
break;
// Add other cases here, if there are multiple ButtonColumns in
// the DataGrid control.
default:
// Do nothing.
break;
}
}
void DeleteItem(DataGridCommandEventArgs e)
{
// e.Item is the table row where the command is raised. For bound
// columns, the value is stored in the Text property of a TableCell.
TableCell itemCell = e.Item.Cells[2];
string item = itemCell.Text;
// Remove the selected item from the data source.
CartView.RowFilter = "Item='" + item + "'";
if (CartView.Count > 0)
{
CartView.Delete(0);
}
CartView.RowFilter = "";
// Rebind the data source to refresh the DataGrid control.
BindGrid();
}
</script>
<body>
<form runat="server">
<h3>DataGrid Editing Example</h3>
<asp:DataGrid id="ItemsGrid"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
OnEditCommand="ItemsGrid_Edit"
OnCancelCommand="ItemsGrid_Cancel"
OnUpdateCommand="ItemsGrid_Update"
OnItemCommand="ItemsGrid_Command"
AutoGenerateColumns="false"
runat="server">
<HeaderStyle BackColor="#aaaadd">
</HeaderStyle>
<Columns>
<asp:EditCommandColumn
EditText="Edit"
CancelText="Cancel"
UpdateText="Update"
HeaderText="Edit item">
<ItemStyle Wrap="False">
</ItemStyle>
<HeaderStyle Wrap="False">
</HeaderStyle>
</asp:EditCommandColumn>
<asp:ButtonColumn
HeaderText="Delete item"
ButtonType="LinkButton"
Text="Delete"
CommandName="Delete"/>
<asp:BoundColumn HeaderText="Item"
ReadOnly="True"
DataField="Item"/>
<asp:BoundColumn HeaderText="Quantity"
DataField="Qty"/>
<asp:BoundColumn HeaderText="Price"
DataField="Price"
DataFormatString="{0:c}"/>
</Columns>
</asp:DataGrid>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="True" %><%@ Import Namespace="System.Data" %> <html> <script runat="server"> // The Cart and CartView objects temporarily store the data source // for the DataGrid control while the page is being processed. DataTable Cart = new DataTable(); DataView CartView; void Page_Load(Object sender, EventArgs e) {
// With a database, use an select query to retrieve the data. Because // the data source in this example is an in-memory DataTable, retrieve // the data from session state if it exists; otherwise, create the data // source. GetSource(); // The DataGrid control maintains state between posts to the server; // it only needs to be bound to a data source the first time the page // is loaded or when the data source is updated. if (!IsPostBack) {
BindGrid(); } } void ItemsGrid_Edit(Object sender, DataGridCommandEventArgs e) { // Set the EditItemIndex property to the index of the item clicked // in the DataGrid control to enable editing for that item. Be sure // to rebind the DateGrid to the data source to refresh the control. ItemsGrid.EditItemIndex = e.Item.ItemIndex; BindGrid(); } void ItemsGrid_Cancel(Object sender, DataGridCommandEventArgs e) { // Set the EditItemIndex property to -1 to exit editing mode. // Be sure to rebind the DateGrid to the data source to refresh // the control. ItemsGrid.EditItemIndex = -1; BindGrid(); } void ItemsGrid_Update(Object sender, DataGridCommandEventArgs e) { // Retrieve the text boxes that contain the values to update. // For bound columns, the edited value is stored in a TextBox. // The TextBox is the 0th control in a cell's Controls collection. // Each cell in the Cells collection of a DataGrid item represents // a column in the DataGrid control. TextBox qtyText = (TextBox)e.Item.Cells[3].Controls[0]; TextBox priceText = (TextBox)e.Item.Cells[4].Controls[0]; // Retrieve the updated values. String item = e.Item.Cells[2].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 the old entry and clear the row filter. CartView.RowFilter = "Item='" + item + "'"; if (CartView.Count > 0) { CartView.Delete(0); } CartView.RowFilter = ""; // *************************************************************** // Insert data validation code here. Be sure to validate the // values entered by the user before converting to the appropriate // data types and updating the data source. // *************************************************************** // Add the new entry. dr = Cart.NewRow(); dr[0] = Convert.ToInt32(qty); dr[1] = item; // If necessary, remove the '$' character from the price before // converting it to a Double. if(price[0] == '$') { dr[2] = Convert.ToDouble(price.Substring(1)); } else { dr[2] = Convert.ToDouble(price); } Cart.Rows.Add(dr); // Set the EditItemIndex property to -1 to exit editing mode. // Be sure to rebind the DateGrid to the data source to refresh // the control. ItemsGrid.EditItemIndex = -1; BindGrid(); } void BindGrid() { // Set the data source and bind to the Data Grid control. ItemsGrid.DataSource = CartView; ItemsGrid.DataBind(); } void GetSource() { // For this example, the data source is a DataTable that is stored // in session state. If the data source does not exist, create it; // otherwise, load the data. if (Session["ShoppingCart"] == null) { // Create the sample data. DataRow dr; // Define the columns of the table. Cart.Columns.Add(new DataColumn("Qty", typeof(Int32))); Cart.Columns.Add(new DataColumn("Item", typeof(String))); Cart.Columns.Add(new DataColumn("Price", typeof(Double))); // Store the table in session state to persist its values // between posts to the server. Session["ShoppingCart"] = Cart; // Populate the DataTable with sample data. for (int i = 1; i <= 9; 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)); Cart.Rows.Add(dr); } } else { // Retrieve the sample data from session state. Cart = (DataTable)Session["ShoppingCart"]; } // Create a DataView and specify the field to sort by. CartView = new DataView(Cart); CartView.Sort="Item"; return; } void ItemsGrid_Command(Object sender, DataGridCommandEventArgs e) { switch(((LinkButton)e.CommandSource).CommandName) { case "Delete": DeleteItem(e); break; // Add other cases here, if there are multiple ButtonColumns in // the DataGrid control. default: // Do nothing. break; } } void DeleteItem(DataGridCommandEventArgs e) { // e.Item is the table row where the command is raised. For bound // columns, the value is stored in the Text property of a TableCell. TableCell itemCell = e.Item.Cells[2]; string item = itemCell.Text; // Remove the selected item from the data source. CartView.RowFilter = "Item='" + item + "'"; if (CartView.Count > 0) { CartView.Delete(0); } CartView.RowFilter = ""; // Rebind the data source to refresh the DataGrid control. BindGrid(); } </script> <body> <form runat="server"> <h3>DataGrid Editing Example</h3> <asp:DataGrid id="ItemsGrid" BorderColor="black" BorderWidth="1" CellPadding="3" OnEditCommand="ItemsGrid_Edit" OnCancelCommand="ItemsGrid_Cancel" OnUpdateCommand="ItemsGrid_Update" OnItemCommand="ItemsGrid_Command" AutoGenerateColumns="false" runat="server"> <HeaderStyle BackColor="#aaaadd"> </HeaderStyle> <Columns> <asp:EditCommandColumn EditText="Edit" CancelText="Cancel" UpdateText="Update" HeaderText="Edit item"> <ItemStyle Wrap="False"> </ItemStyle> <HeaderStyle Wrap="False"> </HeaderStyle> </asp:EditCommandColumn> <asp:ButtonColumn HeaderText="Delete item" ButtonType="LinkButton" Text="Delete" CommandName="Delete"/> <asp:BoundColumn HeaderText="Item" ReadOnly="True" DataField="Item"/> <asp:BoundColumn HeaderText="Quantity" DataField="Qty"/> <asp:BoundColumn HeaderText="Price" DataField="Price" DataFormatString="{0:c}"/> </Columns> </asp:DataGrid> </form> </body></html>