datagrid技巧之一:代码控制选中行的颜色

王朝c#·作者佚名  2006-01-08
窄屏简体版  字體: |||超大  

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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