[英]System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index
I am Getting this error System.ArgumentOutOfRangeException: Index was out of range.我收到此错误 System.ArgumentOutOfRangeException: 索引超出范围。 Must be non-negative and less than the size of the collection.必须是非负的并且小于集合的大小。 Parameter name: index参数名称:索引
Source Error:源错误:
Line 153: Session["Cat"] = e.CommandArgument.ToString();第 153 行:Session["Cat"] = e.CommandArgument.ToString();
Line 154:第 154 行:
Line 155: Session["Cat_ID"] = DataList3.DataKeys[e.Item.ItemIndex].ToString();//error第 155 行:Session["Cat_ID"] = DataList3.DataKeys[e.Item.ItemIndex].ToString();//错误
Line 156: Response.Redirect("Disp_Category.aspx?id=C");第 156 行:Response.Redirect("Disp_Category.aspx?id=C"); Line 157: }第 157 行:}
Please some one what is wrong with this code请问这个代码有什么问题
protected void DataList3_ItemCommand(object source, DataListCommandEventArgs e)
{
Session["L_Id"] = ddlLanguage.SelectedValue;
Session["Cat"] = e.CommandArgument.ToString();
Session["Cat_ID"] = DataList3.DataKeys[e.Item.ItemIndex].ToString();
Response.Redirect("Disp_Category.aspx?id=C");
}
on aspx file i have this在aspx文件上我有这个
<asp:DataList ID="DataList3" runat="server" DataKeyNames="C_Id" DataSourceID="SqlDataSource3" OnItemCommand="DataList3_ItemCommand">
<ItemTemplate>
<table cellpadding="0" cellspacing="0" border=1 width=150>
<tr>
<td>
<asp:LinkButton ID="LinkButton1" runat="server" CommandArgument='<%# Eval("C_Name") %>'
Text='<%# Eval("C_Name") %>' CausesValidation="False"></asp:LinkButton></td>
</tr>
</table>
</ItemTemplate>
</asp:DataList><asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=D:\New Projects\Sym\App_Data\Music.mdf;Integrated Security=True;User Instance=True"
ProviderName="System.Data.SqlClient" SelectCommand="SELECT * FROM [Category] ORDER BY [C_Name]">
</asp:SqlDataSource>
You are not right.你看起来不太对劲。 I suggest to set the id (c_id) and not the name (c_name) in CommandArgument
.我建议在CommandArgument
设置 id (c_id) 而不是名称 (c_name)。 That's your key.那是你的钥匙。 In ItemCommand
you can get entire record by id.在ItemCommand
您可以通过 id 获取整个记录。 Moreover:而且:
Response.Redirect("Disp_Category.aspx?id=C");
becomes变成
Response.Redirect("~/Disp_Category.aspx?id=C"); //id=C? sure?
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