itemdatabound小结

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在DATAGRID中，如果要对某些记录进行格式化或者修饰，用到itemdatabound事件比较方便，

比如，要显示某人的存款金额已经少于某个数额了，要用红色来显示等。itemdatabound事件发生在

数据绑定到datagrid后，而其内容发送到客户端前。比如

private void OnItemDataBound(object sender,

        System.Web.UI.WebControls.DataGridItemEventArgs e)

{

    // Check if the current row contains items; if it’s

    // a header or footer row that will throw an error

    if (e.Item.ItemType == ListItemType.Item ||

        e.Item.ItemType == ListItemType.AlternatingItem)

    {

        // Get a copy of the “dgLabel2” label that contains the

        // “Balance” value

        Label lblBalance = (Label)e.Item.FindControl(“dgLabel2”);

        // Convert the value contained in the label to a double type

        double dblBalance = Convert.ToDouble(lblBalance.Text);

        // If that numeric value is negative

        if(dblBalance < 0)

            // …display it in red

            e.Item.Cells[3].ForeColor = System.Drawing.Color.Red;

        // Get a copy of the “dgLabel1” label that contains the

        // “Country” value

        Label lblCountry = (Label)e.Item.FindControl(“dgLabel1”);

        // …convert it to a string

        string strCountry = lblCountry.Text;

        // If it’s a North American country…

        if(strCountry == “USA” ||

            strCountry == “Mexico” ||

            strCountry == “Canada”)

        {

            // Get a copy of the “dgLabel0” label that contains the

            // “CustomerID” value, we’ll use it in the query string

            // for the popup

            Label lblID = (Label)e.Item.FindControl(“dgLabel0”);

            // …convert it to a string

            string strID = lblID.Text;

            // Replace the “Country” value displayed in the datagrid

            // with “Jamaica”, placed in a hyperlink who’s OnClick

            // event calls a javascript “popup” window

            e.Item.Cells[2].Text = “<a href=/”popup.aspx?id=” + strID +

                “/” onClick=/”popup(this.href); return false;/”>Jamaica</a>”;

        }

    }

}