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DetailView控件ItemUpdating事件里的不到值!

在ItemUpdating事件中 DetailsViewUpdateEventArgs e 里Keys,NewValues,OldValues里总是没有值!请各位看看!


using System;
using System.Data;
using System.Configuration;
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;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {


        if (!IsPostBack)
        {
            this.Bind();
        }
      
    }

    private void Bind()
    {
        String[] keys = new String[] { "ID" };
        this.DetailsView1.DataSource = this.CreateDataSource();
        this.DetailsView1.DataKeyNames = keys;
        this.DetailsView1.DataBind();

    }
    private DataTable CreateDataSource()
    {
        DataTable data = new DataTable();
        data.Columns.Add("ID");
        data.Columns.Add("Code");
        data.Columns.Add("Name");
        data.Columns.Add("Age");

        DataRow d = data.NewRow();
        d["ID"] = 1;
        d["Code"]="001";
        d["Name"]="User1";
        d["Age"] = 27;
        data.Rows.Add(d);

        return data;

    }
    protected void DetailsView1_ItemCommand(object sender, DetailsViewCommandEventArgs e)
    {

        Response.Write(e.CommandName);
    }
    protected void DetailsView1_ModeChanging(object sender, DetailsViewModeEventArgs e)
    {
            
        Response.Write("ModeChanging");
        ((DetailsView)sender).ChangeMode((DetailsViewMode)e.NewMode);
        this.Bind();
    }
    protected void DetailsView1_ModeChanged(object sender, EventArgs e)
    {
        Response.Write("ModeChanged");
    }
    protected void DetailsView1_ItemUpdating(object sender, DetailsViewUpdateEventArgs e)
    {
        //e里面没有人数据!keys,NewValues,和OldValues里都没有值!
        Response.Write("Updating");
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        
    }
}
--------------------编程问答-------------------- TextBox tbLogContext = (TextBox)this.DetailsView1.FindControl("txt_cust_ed"); 
Response.Write(TextBox tbLogContext); 

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补充:.NET技术 ,  ASP.NET
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