获取gridview里的dropdownlist的值时"未将对象引用设置到对象的实例"

[kaqia2003]

我在gridview里增加了两列 一列是一个RadioButtonList,另一列是一个DropDownList

pageload里写了
if (!IsPostBack)
{}

在获取gridview的选取行的值时, RadioButtonList的值可以获取,但是DropDownList的值是"未将对象引用设置到对象的实例"

为什么取不到DropDownList的值啊.

[四维空间151]

我之前也是这个错误，但是后来我自己解决了，是取值的问题，对DropDownList来说，他是一个很特别的类，他的实例不是在gridview里面，有时间找到我的给你看看，只要对他先填充数据。

[lunber]

没有代码不知道错在哪

[kaqia2003]

DropDownList生成语句
for (i = 1; i <= bdsm; i++)
{

DDownList1.Items.Add(new ListItem(i.ToString(), i.ToString()));
}

获取DropDownList值的语句
DropDownList DDownList1 = (DropDownList)row.FindControl("DropDownList");
ssbd = DDownList1.SelectedItem.ToString();

[林少1024]

DropDownList生成语句
for (i = 1; i <= bdsm; i++)
{

DDownList1.Items.Add(new ListItem(i.ToString(), i.ToString()));
}
写在哪....

[zhang_13245768]

[Quote=引用 3 楼 kaqia2003 的回复:]
获取DropDownList值的语句
DropDownList DDownList1 = (DropDownList)row.FindControl("DropDownList");
ssbd = DDownList1.SelectedItem.ToString();[/Quote]
这句写在哪里的

[kaqia2003]

获取DropDownList值的语句
DropDownList DDownList1 = (DropDownList)row.FindControl("DropDownList");
ssbd = DDownList1.SelectedItem.Text.ToString();

[kaqia2003]

protected void list_SelectedIndexChanged(object sender, EventArgs e)
{
RadioButtonList rblidea = (RadioButtonList)row.FindControl("rblidea");
if (rblidea.Items[0].Selected == true)
{
sftbr = "1";
}
else
{
sftbr = "0";
}


DropDownList DDownList1 = (DropDownList)row.FindControl("DropDownList");
ssbd = DDownList1.SelectedItem.Text.ToString();

}

写在gridview的SelectedIndexChanged事件里

[xiehuijianlove]

RadioButtonList rblidea = (RadioButtonList)row[i].FindControl("rblidea");

[kaqia2003]

RadioButtonList的值是可以获取的,倒是DropDownList的值没办法获取.

[guolunfeng]

你循环的哪个i的值应该是空的，你response出来看一下吧，应该是没有值的

[lunber]

ssbd = DDownList1.Text.ToString();

[zcldeson]

调试看看SQL取到 对象集合了么..如果没有SQL除了问题,如果有,就是给值的时候出了问题

[l171147904]

取不到是对的！！！！ 下拉的ID已经被 GRIDVIEW改变了！！你看HTML代码就知道了！

既然ROW能取的到，就能ROW.ITEM 取到 下拉所在的 列！ 然后再转换 DropDownList

[ltcszk]

row是什么

[lovexiu0924]

你那样找肯定是错的 这样去找GridView1.SelectedRow.FindControl("XX");

[l171147904]

建议用 JS去取值！

获取 GRIDVIEW 控件， GRIDVIEW
document.getElementById("GRIDVIEW1").ROW 去取值

[free_live_zyx]

建议楼主把代码粘全

[kaqia2003]

建了一个名为list的griview控件
有list_RowDataBound1和list_SelectedIndexChanged两件事件
protected void list_RowDataBound1(object sender, GridViewRowEventArgs e)
{
e.Row.Height = 30;
DataRowView drvSfhg;
string strHg;
int i;
if (e.Row.RowType == DataControlRowType.DataRow)
{
//外观样式
if (e.Row.RowIndex % 2 == 0)
e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=\"" + e.Row.Style["BACKGROUND-COLOR"] + "\"");
else
e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=\"#EFF3F7\"");
e.Row.Attributes.Add("onmouseover", "this.style.backgroundColor=\"#D1DDF1\"");
//编号
e.Row.Cells[0].Text = (e.Row.RowIndex + 1).ToString();

drvSfhg = (DataRowView)e.Row.DataItem;
strHg = drvSfhg.Row["sfhg"].ToString();

if (strHg == "1")
{
e.Row.Cells[4].Text = "是";
e.Row.Cells[4].ForeColor = Color.Red;
}
else
{
e.Row.Cells[4].Text = "否";
}



RadioButtonList rblidea = (RadioButtonList)e.Row.FindControl("rblidea");
HiddenField hditem = (HiddenField)e.Row.FindControl("hditem");
DropDownList DDownList1 = (DropDownList)e.Row.FindControl("DDownList1");

if (hditem.Value == "1")
{
rblidea.Items[0].Selected = true;

}
else
{
rblidea.Items[1].Selected = true;
}


//生成标段选择列表
for (i = 1; i <= bdsm; i++)
{
DDownList1.Items.Add(new ListItem(i.ToString(), i.ToString()));

}
}
}

-------------------------------------------------------------------------
protected void list_SelectedIndexChanged(object sender, EventArgs e)
{
string zbggbm, qybm, ssbd, sftbr;
zbggbm = Request.QueryString["sgzbbm"].ToString();
GridViewRow row = list.SelectedRow;
qybm = row.Cells[3].Text.Trim();

RadioButtonList rblidea = (RadioButtonList)row.FindControl("rblidea");
if (rblidea.Items[0].Selected == true)
{
sftbr = "1";
}
else
{
sftbr = "0";
}


DropDownList DDownList1 = (DropDownList)row.FindControl("DropDownList");
ssbd = DDownList1.Text.ToString();
}

[kaqia2003]

自己再顶!

[kaqia2003]

我把取值的那段改成了
DropDownList DDownList1 = (DropDownList)list.SelectedRow.Cells[7].FindControl("DropDownList");

ssbd = DDownList1.Text.ToString();


还是一样的为空