大家都知道datagrid是一个使用频率很高的控件,在编写ASP.NET代码的时候,我们总希望能让用户选中指定的行以后,让那一行用不同的颜色显示,虽然datagrid样式也有这个功能,但是我们如何编写代码实现呢?
在本例子中,我们首先动态产生1000行,然后当用户选中datagrid中的某一行的时候,那一行就会变为蓝色。代码如下:
using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls;
namespace WebApplication_rd { /// <summary> /// Demostrates how to have a datagrid server control be bookmarked /// </summary> public class datagrid : System.Web.UI.Page {
protected System.Web.UI.WebControls.DataGrid DGProducts; int bookmarkIndex = 0; // The index of the row that should be scrolled to int itemCount = 0; // Counter for the amount of items on the page bool bookMark = true; // Controls whether or not the page is bookmarked #region DGProducts EventHandlers
private void DGProducts_ItemDataBound(object source, DataGridItemEventArgs e) { if (bookMark) { LiteralControl anchor = new LiteralControl(); anchor.Text = "<a name=\"" + itemCount.ToString() + "\">"; itemCount ++; e.Item.Cells[0].Controls.Add(anchor); } }
private void DGProducts_ItemCommand(object source, DataGridCommandEventArgs e) { if (e.CommandName == "Select") { e.Item.BackColor = Color.Blue;
if (bookMark) { bookmarkIndex = e.Item.ItemIndex; this.InsertScriptBlock(); } } }
#endregion
#region EventHandlers private void Page_Load(object sender, System.EventArgs e) {
this.Bind();
}
#endregion
#region User Defined
private void InsertScriptBlock() { System.Text.StringBuilder jScript = new System.Text.StringBuilder(); jScript.Append("<script language=\"JavaScript\">"); jScript.Append("location.href=\"#"); jScript.Append(this.bookmarkIndex.ToString()); jScript.Append("\";"); jScript.Append("</script>");
this.RegisterClientScriptBlock("Bookmark", jScript.ToString()); }
private void Bind() { DGProducts.DataSource = this.CreateDataSource(1000); DGProducts.DataBind(); }
private DataTable CreateDataSource(int count) { DataTable table = new DataTable(); DataColumn column = null; DataRow row = null;
// Create 5 columns for (int iCol = 0; iCol < 5; iCol++) { column = new DataColumn("Column: " + iCol.ToString(), typeof(string)); table.Columns.Add(column);
}
//Create Rows based on count variable for (int iRows = 0; iRows < count; iRows ++) { row = table.NewRow(); for (int iCol = 0; iCol < 5; iCol ++) { row[iCol] = "Value: " + iCol.ToString(); }
table.Rows.Add(row); } return table; }
#endregion
#region Web Form Designer generated code override protected void OnInit(EventArgs e) { InitializeComponent(); base.OnInit(e); } private void InitializeComponent() { this.DGProducts.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DGProducts_ItemCommand); this.DGProducts.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DGProducts_ItemDataBound); this.Load += new System.EventHandler(this.Page_Load);
} #endregion }
}

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