Question

asp.netdropdownlist绑定数据后，提交页面选择的都是第一项，而且绑定 数据是在！ispostback里面写着的

Answer 1

private int pageSize = 5;
protected void Page_Load(object sender, EventArgs e)
{
if (this.IsPostBack)
return;

ViewState["pageTotal"] = 0;
ViewState["pageCurrent"] = 0;
BindTogvGoods(Convert.ToInt32(ViewState["pageCurrent"]), pageSize);
BindGoodsInfoByddlPage();
}
private void BindTogvGoods(int pageCurrent, int pageSize)
{
int pageTotal = Convert.ToInt32(ViewState["pageTotal"]);

BLL.GoodsInfo goodsBLL = new BLL.GoodsInfo ();
DataSet ds = goodsBLL.PageChangeGoodsInfoPro (pageCurrent, pageSize, out pageTotal);

this.gvGoods .DataSource = ds;
this.gvGoods.DataBind();

ViewState["pageTotal"] = pageTotal;

if (Convert.ToInt32(ViewState["pageCurrent"]) == 0)
{
this.lbtnFrist .Enabled = false;
this.lbtnPro .Enabled = false;
this.lbtnNext .Enabled = true;
this.lbtnLast .Enabled = true;
}
else if (Convert.ToInt32(ViewState["pageCurrent"]) == Convert.ToInt32(ViewState["pageTotal"]) - 1)
{
this.lbtnFrist.Enabled = true;
this.lbtnPro.Enabled = true;
this.lbtnNext.Enabled = false;
this.lbtnLast.Enabled = false;
}
else
{
this.lbtnFrist.Enabled = true;
this.lbtnPro.Enabled = true;
this.lbtnNext.Enabled = true;
this.lbtnLast.Enabled = true;
}
}
protected void lbtnFrist_Click(object sender, EventArgs e)
{
ViewState["pageCurrent"] = 0;
BindTogvGoods(Convert.ToInt32(ViewState["pageCurrent"]), pageSize);
}

protected void lbtnPro_Click(object sender, EventArgs e)
{
ViewState["pageCurrent"] = Convert.ToInt32(ViewState["pageCurrent"]) - 1;
BindTogvGoods(Convert.ToInt32(ViewState["pageCurrent"]), pageSize);
}

protected void lbtnNext_Click(object sender, EventArgs e)
{
ViewState["pageCurrent"] = Convert.ToInt32(ViewState["pageCurrent"]) + 1;
BindTogvGoods(Convert.ToInt32(ViewState["pageCurrent"]), pageSize);
}

protected void lbtnLast_Click(object sender, EventArgs e)
{
ViewState["pageCurrent"] = Convert.ToInt32(ViewState["pageTotal"]) - 1;
BindTogvGoods(Convert.ToInt32(ViewState["pageCurrent"]), pageSize);
}

protected void ddlPage_SelectedIndexChanged(object sender, EventArgs e)
{
ViewState["pageCurrent"] = Convert.ToInt32(this.ddlPage.SelectedValue);
BindTogvGoods(Convert.ToInt32(ViewState["pageCurrent"]), pageSize);
}

Answer 2

是说绑定之后默认选中的是第一项，还是说选择了其他选项，提交页面之后总数取到的第一项的值呢？

Answer 3

这个是页面回发的问题，看来你是！IsPostBack没加对地方了，可以在Page_Load(object sender, EventArgs e)方法里面加上这么一段代码，if(IsPostBack){return;}

Answer 4

你能不能说明白点呢