Griview中DataKeyNames的用法（多个主键）?

1.单个主键 
using System; 
using System.Data; 
using System.Configuration; 
using System.Collections; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 
using System.Data.SqlClient; 
public partial class GridViewCheckbox : System.Web.UI.Page 
{ 
    SqlConnection sqlcon; 
    protected void Page_Load(object sender, EventArgs e) 
    { 
        if (!IsPostBack) 
        { 
            bind(); 
        } 
    } 
    protected void CheckBox2_CheckedChanged(object sender, EventArgs e) 
    { 
        for (int i = 0; i <= GridView1.Rows.Count - 1; i++) 
        { 
            CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1"); 
            if (CheckBox2.Checked == true) 
            { 
                cbox.Checked = true; 
            } 
            else 
            { 
                cbox.Checked = false; 
            } 
        } 
    } 
    protected void Button1_Click(object sender, EventArgs e) 
    { 
        sqlcon = DB.createCon(); 
        SqlCommand sqlcom; 
        for (int i = 0; i <= GridView1.Rows.Count - 1; i++) 
        { 
            CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1"); 
            if (cbox.Checked == true) 
            { 
                string sqlstr = "delete from Employee where 身份证号码='" + GridView1.DataKeys[i].Value + "'"; 
                sqlcom = new SqlCommand(sqlstr, sqlcon); 
                sqlcon.Open(); 
                sqlcom.ExecuteNonQuery(); 
                sqlcon.Close(); 
            } 
        } 
        bind(); 
    } 
    protected void Button2_Click(object sender, EventArgs e) 
    { 
        CheckBox2.Checked = false; 
        for (int i = 0; i <= GridView1.Rows.Count - 1; i++) 
        { 
            CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1"); 
            cbox.Checked = false; 
        } 
    } 
    public void bind() 
    { 
        string sqlstr = "select top 4 * from Employee"; 
        sqlcon = DB.createCon(); 
        SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon); 
        DataSet myds = new DataSet(); 
        sqlcon.Open(); 
        myda.Fill(myds, "Employee"); 
        GridView1.DataSource = myds; 
        GridView1.DataKeyNames = new string[] { "身份证号码" }; 
        GridView1.DataBind(); 
        sqlcon.Close(); 
    } 
} 
2.多个主键 
using System; 
using System.Data; 
using System.Configuration; 
using System.Collections; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 
using System.Data.SqlClient; 
public partial class SendMessageBox : System.Web.UI.Page 
{ 
    protected void Page_Load(object sender, EventArgs e) 
    { 
        if(!IsPostBack) 
        { 
            bind(); 
        } 
    } 
    public void bind() 
    { 
        string str = "select * from Sms_Send"; 
        SqlConnection con = DB.CreateDB(); 
        SqlDataAdapter da = new SqlDataAdapter(str, con); 
        DataSet ds = new DataSet(); 
        con.Open(); 
        da.Fill(ds, "Sms_Send"); 
        GridView1.DataSource = ds; 
        GridView1.DataKeyNames = new string[] { "Mobile", "SendTime" }; 
        GridView1.DataBind(); 
    } 
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e) 
    { 
        foreach (TableCell tc in e.Row.Cells) 
        { 
            tc.Attributes["style"] = "border-color:Black"; 
        } 
        if (e.Row.RowIndex != -1) 
        { 
            int id = e.Row.RowIndex + 1; 
            e.Row.Cells[1].Text = id.ToString(); 
        }     
    } 
    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e) 
    { 
        GridView1.PageIndex = e.NewPageIndex; 
        bind(); 
        GridView1.PageIndex = e.NewPageIndex; 
    } 
    protected void btnSelectAll_Click(object sender, ImageClickEventArgs e) 
    { 
        for(int i=0;i<=GridView1.Rows.Count-1;i++) 
        { 
            CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1"); 
            if(cbox.Checked==false) 
            { 
                cbox.Checked=true; 
            } 
        } 
    } 
    protected void btnCancel_Click(object sender, ImageClickEventArgs e) 
    { 
        for(int i=0;i<=GridView1.Rows.Count-1;i++) 
        { 
            CheckBox cbox=(CheckBox)GridView1.Rows[i].FindControl("CheckBox1"); 
            if(cbox.Checked==true) 
            { 
                cbox.Checked=false; 
            } 
        } 
    } 
   protected void btnQuery_Click(object sender, ImageClickEventArgs e)
    {
        DateTime start = DateTime.Parse(txtStart.Text.ToString());// Convert.ToDateTime(txtStart.Text.ToString());
        DateTime end = Convert.ToDateTime(txtEnd.Text.ToString());
        if (end <= start)
        {
            Page.RegisterStartupScript("message", "<Script>alert('结束日期必须大于开始日期！')</Script>");
            return;
        }
        string str = "select * from Sms_Send where SendTime between '" + start + "' and '" + end + "'";//"select * from Sms_Send where SendTime>=start and SendTime<=end";
        SqlConnection con = DB.CreateDB();
        SqlDataAdapter da = new SqlDataAdapter(str, con);
        DataSet ds = new DataSet();
        da.Fill(ds, "Sms_Send");
        GridView1.DataSource = ds;
        GridView1.DataKeyNames = new string[] { "Mobile", "SendTime" };
        GridView1.DataBind();
    }
    protected void btnDelete_Click(object sender, ImageClickEventArgs e) 
    { 
        SqlConnection con = DB.CreateDB(); 
        SqlCommand cmd; 
        for (int i = 0; i <= GridView1.Rows.Count - 1; i++) 
        { 
            CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1"); 
            if (cbox.Checked == true) 
            { 
                DataKey datakey = GridView1.DataKeys[i]; 
                string mobile = datakey["Mobile"].ToString(); 
                string sendTime = datakey["SendTime"].ToString(); 
                string str = "delete from Sms_Send where Mobile='" + mobile + "'and SendTime='" + sendTime + "'"; 
                cmd = new SqlCommand(str, con); 
                con.Open(); 
                cmd.ExecuteNonQuery(); 
                con.Close(); 
            } 
        } 
        bind(); 
    } 

}

http://www.cnblogs.com/huangjianhuakarl/articles/1095657.html