请帮我找出我的错误 [英] Plz...help me to find out my error
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问题描述
但错误显示为tat ...
but the error displays like tat...
Unable to cast object of type 'System.Web.UI.WebControls.DataControlLinkButton' to type 'System.Web.UI.WebControls.TextBox'
组织代码
tis s t code
<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False"
CellPadding="3" CellSpacing="2" OnPageIndexChanging="GridView1_PageIndexChanging"
OnRowCancelingEdit="GridView1_RowCancelingEdit" OnRowEditing="GridView1_RowEditing"
OnRowUpdating="GridView1_RowUpdating" PageSize="3">
<Columns>
<asp:CommandField ShowEditButton="True" />
<asp:BoundField DataField="name" HeaderText="Name" />
</Columns>
</asp:GridView>
SqlConnection con1 = new SqlConnection(ConfigurationManager.AppSettings["rajarani connection"]);
con1.Open();
SqlDataAdapter adp1 = new SqlDataAdapter("update registerform set fullname='" + ((TextBox)GridView2.Rows[e.RowIndex].Cells[1].Controls[0]).Text + "' where registerform.id='"+GridView2.Rows[e.RowIndex].Cells[0].Text+"' ", con1);
DataSet ds1 = new DataSet();
adp1.Fill(ds1);
con1.Close();
GridView2.EditIndex = -1;
bind();
plz..help me ..
plz..help me ..
推荐答案
可以尝试,
Can you try,
((LinkButton)GridView2.Rows[e.RowIndex].Cells[1].Controls[0]).Text
我希望这能解决问题.
I hope this will work.
这看起来像是您的投射不正确
It simply looks like your casting is incorrect
(TextBox)GridView2.Rows[e.RowIndex].Cells[1].Controls[0]).Text
尝试在投放之前先测试对象:
Try to test the object first before casting:
if(typeof(TextBox).IsAssignableFrom(GridView2.Rows[e.RowIndex].Cells[1].Controls[0].GetType()))
{
// ...cast value ((TextBox)GridView2.Rows[e.RowIndex].Cells[1].Controls[0]).Text;
}
;
祝你好运!
Good luck!
我相信以下行会产生错误
((TextBox)GridView2.Rows [e.RowIndex] .Cells [1] .Controls [0]).Text
似乎在Cells [1]中,您使用的是LinkButton而不是TextBox,因此,当您将LinkButton强制类型转换为TextBox时,运行时将引发错误.
如果不清楚,请提供.aspx文件中GridView控件的标记.
I belive the following line is creating the error
((TextBox)GridView2.Rows[e.RowIndex].Cells[1].Controls[0]).Text
It seems that in Cells[1] you have used a LinkButton rather than a TextBox, So when you are type casting that LinkButton to TextBox the runtime is throwing the error.
If not clear, please provide the markup of the GridView control from .aspx file.
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