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 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; }修改price 列时没有问题,可是当修改quantity列时老是提示: 输入字符串的格式不正确。可是明明都是使用的int32类型,应该没问题啊,请各位指教!
{ // 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 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; }修改price 列时没有问题,可是当修改quantity列时老是提示: 输入字符串的格式不正确。可是明明都是使用的int32类型,应该没问题啊,请各位指教!
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