代码控制选中行的颜色

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
}

}