Gridview下的DropDownList问题,很郁闷.

[itcoo]

GridView中的第条数据行都绑定了一个DropDownList,要取得DropDownList所在行的SelectedValue和DataKeys的值.
本来已经实现了.后来不记得改动了哪里又不能实现了.很郁闷.请各位指点一下.
/////////////////////////////////////
<asp:TemplateField>
<ItemTemplate>
<asp:DropDownList ID="ddlSubCht" runat="server" DataSourceID="objSubCht" DataTextField="SubName" DataValueField="SubId" AutoPostBack="True" OnSelectedIndexChanged="ddlSubCht_SelectedIndexChanged" >
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
////////////////////////////////////

protected void ddlSubCht_SelectedIndexChanged(object sender, EventArgs e)
        {
            for (int i = 0; i < gvCategories.Rows.Count; i++)
            {
                DropDownList ddl = (DropDownList)gvCategories.Rows[i].FindControl("ddlSubCht");//问题1:在Debug下发现不能找到控件
                int ddlint = Convert.ToInt32(ddl.SelectedValue);//问题2:提示"未将对象引用设置到对象的实例"
                int key = (int)gvCategories.DataKeys[i].Value;//问题3:总是返回的同一个值.我想返回的是每行对应的DataKeys

                lbl.Text= ddlint+"_"+key+"_"+isSingle.ToString();//输出
            }
        }

[mators]

http://www.cnblogs.com/weekzero/archive/2006/05/16/401231.html
自己慢慢研究,:)

[itcoo]

楼上方案无用~~继续

[bhtfg538]

LZ是不是少了他的Cell【】

[itcoo]

不是Cell的问题.已经试过了

[dotnetsong]

方法位置不对吧

[QQQQAnnie]

1，方法位置不对
2，确实少cell[]
你不精确到单元格是找不到控件的

[include_me]

protected void ddlSubCht_SelectedIndexChanged(object sender, EventArgs e)
{
   DropDownList ddl = (DropDownList)sender;
   int ddlint = Convert.ToInt32(ddl.SelectedValue);
   int key = (int)gvCategories.DataKeys[(ddl.Parent as GridViewRow).RowIndex].Value;
   ..
}

[qq2013]

顶

[hy_lihuan]

foreach (GridViewRow row in this.GvCaseApplyList.Rows)
{
CheckBox chkPunish = (CheckBox)row.FindControl("chkCaseApply");
id=this.GvCaseApplyList.DataKeys[row.RowIndex][1].ToString();
}

第一个问题，就是没有找到控件啊；
第二个问题，编码习惯不好，在FindControl以后，都要做是否null的检测的；
第三个问题：看上面代码；

[huguang2yq]

DropDownList ddl = (DropDownList)gvCategories.Rows[i].FindControl("ddlSubCht");//问题1:在Debug下发现不能找到控件
定位不对吧....你这对应的是第几行...单元格呢?

[zhulinghappy]

DropDownList ddl = gvCategories.Rows[i].FindControl("ddlSubCht") as DropDownList;//

另外还要精确到cell

[xuexiziji]

[Quote=引用 5 楼 include_me 的回复:]
C# code
protected void ddlSubCht_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList ddl = (DropDownList)sender;
int ddlint = Convert.ToInt32(ddl.SelectedValue);
int key = (int)gvCategories.DataKeys[(ddl.Parent as GridViewRow).RowIndex].Value;
..
}
[/Quote]

[chinaicm]

DropDownList ddl = (DropDownList)gvCategories.Rows[i].FindControl("ddlSubCht");
测试了一下,可以找到控件啊,你看看是不是数据什么的出错了.

[itcoo]

没有办法解决吗？up～～

[yagebu1983]

代码根本就不对！！

[yagebu1983]

protected void ddlSubCht_SelectedIndexChanged(object sender, EventArgs e)
        {
            for (int i = 0; i < gvCategories.Rows.Count; i++)
            {
                DropDownList ddl = (DropDownList)gvCategories.Rows[i].FindControl("ddlSubCht");//问题1:在Debug下发现不能找到控件
                int ddlint = Convert.ToInt32(ddl.SelectedValue);//问题2:提示"未将对象引用设置到对象的实例"
                int key = (int)gvCategories.DataKeys[i].Value;//问题3:总是返回的同一个值.我想返回的是每行对应的DataKeys

                lbl.Text= ddlint+"_"+key+"_"+isSingle.ToString();//输出
            }
        }

SelectedIndexChanged事件是谁的？？

[yagebu1983]

你直接写到一个方法中试试！！

[insus]

虽然是DataList例子,但是还是可以参考的:

http://blog.csdn.net/insus/archive/2008/04/28/2336874.aspx

[itcoo]

完美解决.
原来是要通过委托来取得DataKeys,受益非浅.

[紫气东来_999]

[Quote=引用 23 楼 itcoo 的回复:]
完美解决.
原来是要通过委托来取得DataKeys,受益非浅.
[/Quote]