.NET - SelectedRow 不返回任何值

Question

我是 .net 的新手！

我有两个网格视图连接到一个大型数据库。第一个返回按 ID 搜索的问题列表，而另一个返回按主题搜索的问题。

我试图从选择按钮返回问题的 gridview 中获取 ID，但是当我使用 selectedRow 时它不会返回任何内容。

我尝试了多种方法，这就是我现在所拥有的。有什么建议？

    Protected Sub IssuesGV_SelectedIndexChanging(ByVal sender As Object, ByVal e As GridViewSelectEventArgs)
        Dim pName As String
        pName = IssuesGV.SelectedRow.Cells(0).Text
        BindGridComments(pName)
    End Sub

    Protected Sub IssuesGV_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
        If e.Row.RowType = DataControlRowType.DataRow Then
            e.Row.Attributes("onmouseover") = "this.style.backgroundColor='aquamarine';"
            e.Row.Attributes("onmouseout") = "this.style.backgroundColor='white';"
            e.Row.ToolTip = "Click last column for selecting this row."
            ' e.Row.Cells(0).Attributes.Add("onclick", )
        End If
    End Sub
Protected Sub IssuesGV_RowCommand(sender As Object, e As GridViewCommandEventArgs)


        ' ' Dim row As GridViewRow = IssuesGV.Rows(rowIndex)

        '     v = row.Cells(1).Text
        'v = IssuesGV.SelectedRow.Cells(0).Text
        ' TextBox1.Text = v
        'TextBox1.Text = v

        If (e.CommandName = "Select1") Then
            Dim index As Int16
            index = Convert.ToInt32(e.CommandArgument)
            Dim row As GridViewRow
            row = IssuesGV.Rows(index)
            Dim item As ListItem
            item.Text = Server.HtmlDecode(row.Cells(0).Text)
        End If




    End Sub

我的 gridview 代码如下（我使用选择按钮的地方）：

 <asp:GridView ID="IssuesGV" runat="server" AutoPostBack="true" OnRowCommand ="IssuesGV_RowCommand" OnRowDataBound="IssuesGV_RowDataBound" OnSelectedIndexChanged = "IssuesGV_OnSelectedIndexChanged" SelectedIndexChaning ="IssuesGV_SelectedIndexChanging" AutoGenerateColumns="False" DataKeyNames="number" DataSourceID="IssueDS" EnableModelValidation="True">
            <Columns>
                <asp:BoundField DataField="number" HeaderText="number" ReadOnly="True" SortExpression="number" />
                <asp:BoundField DataField="subject" HeaderText="subject" SortExpression="subject" />
                <asp:BoundField DataField="description" HeaderText="description" SortExpression="description" />
                <asp:BoundField DataField="created_at" HeaderText="created_at" SortExpression="created_at" />
                <asp:BoundField DataField="opener_name" HeaderText="opener_name" SortExpression="opener_name" />
                <asp:BoundField DataField="project_name" HeaderText="project_name" SortExpression="project_name" />
                <asp:ButtonField Text="Select" CommandName="Select1" ItemStyle-Width="30" ButtonType="Button" HeaderText="Select" ShowHeader="True" SortExpression="number"  >
                <ItemStyle Width="30px" />
                </asp:ButtonField>
            </Columns>
        </asp:GridView>

我收到的错误是这个：

System.ArgumentOutOfRangeException HResult=0x80131502
消息=索引超出范围。必须是非负数且小于 集合的大小。参数名称：index Source= StackTrace：

非常感谢！

Answer 1

前端：

您的 GridView 应如下所示：

<asp:GridView ID="IssuesGV" runat="server" AutoGenerateColumns="false" 
    OnSelectedIndexChanged="IssuesGV_OnSelectedIndexChanged">
    <Columns>
        <asp:BoundField DataField="number" HeaderText="number" />

            ...Some Other Fields

        <asp:ButtonField Text="Select" CommandName="Select" ItemStyle-Width="150" />
    </Columns>
</asp:GridView>

后端：

然后在GridView中添加OnSelectedIndexChanged这个代码：

Protected Sub IssuesGV_OnSelectedIndexChanged(sender As Object, e As EventArgs)
    'Accessing Selected BoundField Column
    Dim number As String = IssuesGV.SelectedRow.Cells(0).Text

    label.Text = "<b>Number Value:</b> " & number & " <b>"
End Sub

参考：查看完整示例here。

---

编辑

由于某种原因，如果 OnSelectedIndexChanged 方法没有触发，那么您只需在 GridView 标头标记中添加以下属性：

AutoGenerateSelectButton="True"

这将在您的 GridView 行中创建一个 Select 链接，这将触发 OnSelectedIndexChanged 方法。

PS：如果以上所有解决方法都不起作用，请查看此post。