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从ASP.NET网格视图获取数据行

datarow event-handling gridview asp.net c#

Ian Kemp · 技术社区 · 15 年前

我有一个ASP.NET GridView 那一定是 ObjectDataSource (绑定到MySQL数据库)。在这个网格上,我有2个未绑定的 ButtonField 要触发服务器端事件的列。因此,我向 GRIDVIEW 的 RowCommand 事件。

在所述事件处理程序的代码中,我需要以某种方式获取底层 DataRow 用户单击了。但是,我似乎无法让它工作;如果我使用如下代码 selectedRow 变量总是 null :

protected void searchResultsGridView_RowCommand(object sender, GridViewCommandEventArgs e)
{
  CallDataRow selectedRow = (CallDataRow) searchResultsGridView.Rows[Convert.ToInt32(e.CommandArgument)].DataItem;
}

我在谷歌上找到了 http://ranafaisal.wordpress.com/2008/03/31/how-to-get-the-current-row-in-gridview-row-command-event 但是我发现什么都没用。我很确定我只是错过了一些明显的东西,但我不知道是什么…

以下是ASP.NET代码,如果这有帮助:

  <asp:GridView ID="searchResultsGridView" runat="server" AutoGenerateColumns="False" 
    DataKeyNames="PersonNo,CallDate" 
    Width="100%" AllowPaging="True" EnableSortingAndPagingCallbacks="True" 
    onrowcommand="searchResultsGridView_RowCommand" PageSize="20">
    <Columns>
      <asp:BoundField DataField="PersonNo" HeaderText="Account number" ReadOnly="True" 
        SortExpression="PersonNo" />
      <asp:BoundField DataField="AgentNo" HeaderText="Agent number" 
        SortExpression="AgentNo" />
      <asp:BoundField DataField="AgentName" HeaderText="Agent name" 
        SortExpression="AgentName" />
      <asp:BoundField DataField="TelNumber" HeaderText="Telephone number" 
        SortExpression="TelNumber" />
      <asp:BoundField DataField="CallDate" HeaderText="Call date/time" ReadOnly="True" 
        SortExpression="CallDate" />
      <asp:ButtonField CommandName="play" HeaderText="Audio" ShowHeader="True" 
        Text="Play" />
      <asp:ButtonField CommandName="download" Text="Download" />
    </Columns>
  </asp:GridView>

5 回复 | 直到 8 年前

Ian Kemp 15 年前

最后,通过执行以下操作使其工作:

添加包含绑定hiddenfield的模板字段。

<asp:TemplateField ShowHeader="False">
  <ItemTemplate>
    <asp:HiddenField ID="audioFileName" runat="server" Value='<%# Eval("AudioFileName") %>' />
  </ItemTemplate>
</asp:TemplateField>

在rowcommand事件处理程序中添加以下代码:

protected void searchResultsGridView_RowCommand(object sender, GridViewCommandEventArgs e)
{
  string audioFile = ((HiddenField) searchResultsGridView.Rows[Convert.ToInt32(e.CommandArgument)].FindControl("audioFileName")).Value;
}

这是一个小聪明,也不是特别安全,但它能起作用,这就是我现在所需要的。不过,我们仍然欢迎更好的解决方案…

RemarkLima 12 年前

我更晚去参加聚会了!但当我从Google上得到这个答案时,有些人可能仍然会点击这个,所以我会给出我的答案:

protected void SomeDataGrid_RowDataBound(object sender, GridViewRowEventArgs e)
{
   if (e.Row.RowType == DataControlRowType.DataRow)
   {
       System.Data.DataRowView dr = (System.Data.DataRowView)e.Row.DataItem;
       string aVar = dr["DataFieldIdLikePlease"].ToString();
   }
}

这样就可以得到代码隐藏中的任何数据字段。

pete 13 年前

我意识到这晚了2.5年(对不起!之前没有看到它…),但我使用两个静态/共享方法直接转换行。也许这就是你想要做的?

vb.net版本:

Public Shared Function GridViewRowToDataRow(ByVal gvr As GridViewRow) As DataRow
    Dim di As Object = Nothing
    Dim drv As DataRowView = Nothing
    Dim dr As DataRow = Nothing

    If gvr IsNot Nothing Then
        di = TryCast(gvr.DataItem, System.Object)
        If di IsNot Nothing Then
            drv = TryCast(di, System.Data.DataRowView)
            If drv IsNot Nothing Then
                dr = TryCast(drv.Row, System.Data.DataRow)
            End If
        End If
    End If

    Return dr
End Function

Public Shared Function GridViewRowEventArgsToDataRow(ByVal e As GridViewRowEventArgs) As DataRow
    Dim gvr As GridViewRow = Nothing
    Dim di As Object = Nothing
    Dim drv As DataRowView = Nothing
    Dim dr As DataRow = Nothing

    If e.Row.RowType = DataControlRowType.DataRow Then
        gvr = TryCast(e.Row, System.Web.UI.WebControls.GridViewRow)
        dr = Helpers.GridViewRowToDataRow(gvr)
    End If

    Return dr
End Function

c.net(转换时使用: http://www.developerfusion.com/tools/convert/vb-to-csharp/ ):

public static DataRow GridViewRowToDataRow(GridViewRow gvr)
{
    object di = null;
    DataRowView drv = null;
    DataRow dr = null;

    if (gvr != null) {
        di = gvr.DataItem as System.Object;
        if (di != null) {
            drv = di as System.Data.DataRowView;
            if (drv != null) {
                dr = drv.Row as System.Data.DataRow;
            }
        }
    }

    return dr;
}

public static DataRow GridViewRowEventArgsToDataRow(GridViewRowEventArgs e)
{
    GridViewRow gvr = null;
    object di = null;
    DataRowView drv = null;
    DataRow dr = null;

    if (e.Row.RowType == DataControlRowType.DataRow) {
        gvr = e.Row as System.Web.UI.WebControls.GridViewRow;
        dr = Helpers.GridViewRowToDataRow(gvr);
    }

    return dr;
}

Kiquenet user385990 8 年前

 int index = Convert.ToInt32(e.CommandArgument);

 GridViewRow row = searchResultsGridView.Rows[index];

dancl 8 年前

要做到这一点,一个干净的方法似乎是在GridView上使用“DataKeyNames”属性。数据源应包含一个列,该列是唯一标识符或主键。然后,可以将GridView上的DataKeyNames属性设置为该属性的名称。

然后,与所选行对应的该列的值在row command中可用,并可用于确保将该命令应用于唯一标识的对象。

<asp:GridView ID="gridview" runat="server" ... DataKeyNames="pkey">


protected void gridview_OnRowCommand(object sender, EventArgs e)        
{
    string selectedPkey = null;
    GridViewCommandEventArgs  gridEvent = (GridViewCommandEventArgs)e;
    int index = Convert.ToInt32(gridEvent.CommandArgument);
    if (index >= 0 && index < gridview.Rows.Count)
    {
        GridViewRow r = gridview.Rows[index];
        selectedPkey = gridview.DataKeys[index].Value.ToString();
    }