为GridView绑定主键的方法，在前台的DataGrid标签中加 DataKeyNames="ID"
后台获取ID： int id=int.parse(this.GridView.DataKeys[e.RowIndex].Value.Tostring());
如果DataKeyNames绑定了多个列取法：int id=int.parse(this.GridView.DataKeys[e.RowIndex].Value["ID"].Tostring());
*****注意GridView在执行添删改时如果是提交性质按钮一定会触发GridView_RowCommand( , )事件
在此事件下通过e.CommandName属性便可知道是按了添删改的那个按钮。
下面是GridView实现全选和取消全选的功能实现：
为GridView1添加一个模板列，给其头模板添
onClick事件代码如下
οnclick="SelectAll(this)" />
给其项模板
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class GridViewDemo_Default3 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
ShowCategories();
ShowProducts();
}
}
private void ShowProducts()
{
DataTable dt = NorthWind.DBHelp.GetTable("SELECT Product.产品ID, Product.产品名称, Supply.公司名称, Supply.城市, Category.类别名称, Category.图片, Product.单位数量, Product.单价, Product.库存量, Product.中止 FROM Category INNER JOIN Product ON Category.类别ID = Product.类别ID INNER JOIN Supply ON Product.供应商ID = Supply.供应商ID where Product.类别ID="+int.Parse(this.DropDownList1.SelectedValue));
this.GridView1.DataSource = dt;
this.GridView1.DataKeyNames = new string[]{"产品ID"};//设置数据操作的主键列
this.GridView1.DataBind();
}
private void ShowCategories()
{
DataTable dt = NorthWind.DBHelp.GetTable("select * from Category");
this.DropDownList1.DataSource = dt;
this.DropDownList1.DataTextField = "类别名称";
this.DropDownList1.DataValueField = "类别ID";
this.DropDownList1.DataBind();
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
ShowProducts();
}
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
}
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
//将当前要编辑的行的索引告诉GridView
this.GridView1.EditIndex = e.NewEditIndex;
ShowProducts();
}
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
//更新数据库
decimal price = decimal.Parse(((TextBox)this.GridView1.Rows[e.RowIndex].Cells[3].FindControl("TextBox1")).Text);
int productid = int.Parse(this.GridView1.DataKeys[e.RowIndex].Value.ToString());//获取当前行的主键
//更新到数据库
NorthWind.DBHelp.ExecuteNoQuery("update Product set 单价="+price+" where 产品ID="+productid);
//重新绑定
this.GridView1.EditIndex = -1;
ShowProducts();
}
protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
this.GridView1.EditIndex = -1;
ShowProducts();
}
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//删除数据
int productid = int.Parse(this.GridView1.DataKeys[e.RowIndex].Value.ToString());//获取当前行的主键
//更新到数据库
NorthWind.DBHelp.ExecuteNoQuery("delete from Product where 产品ID=" + productid);
//重新绑定
this.GridView1.EditIndex = -1;
ShowProducts();
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
//当我们对数据源中的每一行进行数据绑定时触发的事件
if (e.Row.RowType == DataControlRowType.DataRow)//判断绑定时候该行的状态时数据行还是其他类型的模板
{
//如果要把ID列绑到GridView中为连续不断的ID，可先添加绑定列ID,取消其DataFiled的绑定，在该事件加下面代码：
//e.Row.Cells[0].Text=(e.Row.RowIndex+1).ToString();
//添加客户端确认
LinkButton lnkDelete = (LinkButton)e.Row.Cells[10].FindControl("lnkDelete");
lnkDelete.Attributes.Add("onclick", "return confirm('你确认删除吗？')");
//光棒效果 和 鼠标小手效果
e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor='#ff66cc';this.style.cursor='pointer';");
e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c;this.style.cursor='default';");
}
}
protected void chkSelectAll_CheckedChanged(object sender, EventArgs e)
{
//获取全选的复选框
CheckBox chkSelectAll = (CheckBox)sender;
//获取每一行的复选框
for (int i = 0; i < this.GridView1.Rows.Count; i++)
{
CheckBox chkSelect = (CheckBox)this.GridView1.Rows[i].Cells[11].FindControl("chkSelect");
//修改状态
chkSelect.Checked = chkSelectAll.Checked;
}
}
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
//告诉GridView当前显示的数据是第几页的数据
this.GridView1.PageIndex= e.NewPageIndex;
ShowProducts();
}
}