System.ArgumentOutOfRangeException：索引超出范围。必须是非负并小于集合的大小。参数名称：索引 [英] System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

问题描述

我得到这个错误
System.ArgumentOutOfRangeException：索引超出范围。必须是非负并小于集合的大小。
参数名称：索引

源错误：

  

153线：会话[猫] = e.CommandArgument.ToString（）;结果
  154线：结果
  155线：会话[CAT_ID] =
  DataList3.DataKeys [e.Item.ItemIndex]的ToString（）; //错误结果
  156线：Response.Redirect的（？Disp_Category.aspx ID = C）;
  157线：}

请一些一什么是错的这个code

 保护无效DataList3_ItemCommand（对象源，DataListCommandEventArgs E）
 {
     会话[L_Id] = ddlLanguage.SelectedValue;
     会话[猫] = e.CommandArgument.ToString（）;     会话[CAT_ID] = DataList3.DataKeys [e.Item.ItemIndex]的ToString（）;
     的Response.Redirect（Disp_Category.aspx ID = C？）;
 }
 

在aspx文件我有这个

 ＆LT; ASP：DataList控件ID =DataList3=服务器的DataKeyNames =C_ID的DataSourceID =SqlDataSource3OnItemCommand =DataList3_ItemCommand＆GT;
                                ＆LT;＆ItemTemplate中GT;
                                    ＆LT;表格的cellpadding =0CELLSPACING =0边界= 1 WIDTH = 150＆GT;
                                        ＆所述; TR＆GT;
                                            ＆所述; TD＆GT;
                                                ＆LT; ASP：LinkBut​​ton的ID =LinkBut​​ton1=服务器CommandArgument ='＆LT;％＃的eval（C_Name）％＆GT;'
                                                    文字='＆LT;％＃的eval（C_Name）％＆GT;'的CausesValidation =FALSE＆GT;＆LT; / ASP：LinkBut​​ton的＆GT;＆LT; / TD＆GT;
                                        ＆LT; / TR＆GT;
                                    ＆LT; /表＆gt;
                                ＆LT; / ItemTemplate中＆GT;
                            ＆LT; / ASP：DataList控件＆GT;＆LT; ASP：SqlDataSource的ID =SqlDataSource3=服务器的ConnectionString =数据源= \\ SQLEX $ P $干燥综合征; AttachDbFilename = D：\\新建项目\\符号\\ App_Data文件\\音乐。中纤板;集成安全=真;用户实例=真
                                的ProviderName =System.Data.SqlClient的的SelectCommand =SELECT * FROM [类别] ORDER BY [C_Name]＆GT;
                            ＆LT; / ASP：SqlDataSource的＆GT;
 

解决方案

您是不正确的。
我建议设置 CommandArgument 的ID（C_ID），而不是名称（c_name）。
这是您的钥匙。在 ItemCommand 可以通过id来获取全部记录。
此外：

 的Response.Redirect（？Disp_Category.aspx ID = C）;
 

变为

 的Response.Redirect（？〜/ Disp_Category.aspx ID = C）; // ID = C？当然？
 

I am Getting this error System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

Source Error:

Line 153: Session["Cat"] = e.CommandArgument.ToString();
Line 154:
Line 155: Session["Cat_ID"] = DataList3.DataKeys[e.Item.ItemIndex].ToString();//error
Line 156: Response.Redirect("Disp_Category.aspx?id=C"); Line 157: }

Please some one what is wrong with this code

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

<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>

解决方案

You are not right. I suggest to set the id (c_id) and not the name (c_name) in CommandArgument. That's your key. In ItemCommand you can get entire record by id. Moreover:

Response.Redirect("Disp_Category.aspx?id=C");

becomes

Response.Redirect("~/Disp_Category.aspx?id=C");  //id=C? sure?

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