¿Por qué recibo un error de referencia de objeto nulo al guardar (evento OnItemUpdating) el primer elemento de edición en un ListView?

Question

Recibo el error " Referencia de objeto no establecida en una instancia de un objeto. " al intentar hacer referencia a un HiddenField (lvEditProjectSteps_hdnStepStatusId para referencia futura) desde el EditItem durante el evento OnItemUpdating después de que el evento Update se inicie en un ListView. Esto solo ocurre en el primer elemento en el ListView. Revisé la fuente y el HTML se está procesando correctamente.

¡Se aprecia CUALQUIER conocimiento! Gracias de antemano ...

Error de fuente:

var lvEditProjectSteps_hdnStepStatusId = (HiddenField) lvEditProjectSteps.EditItem.FindControl("lvEditProjectSteps_hdnStepStatusId");

Aquí está el lado aspx de ListView:

<asp:ListView ID="lvEditProjectSteps" runat="server"
  OnItemDataBound="lvEditProjectSteps_OnItemDataBound" 
  OnItemUpdating="lvEditProjectSteps_OnItemUpdating" 
  DataSourceID="odsEditProjectStep" 
  DataKeyNames="Id">
  <LayoutTemplate>
    <table class="standard-box-style" style="width:800px">
      <thead>
        <tr>
          <th>&nbsp;</th>
          <th>&nbsp;</th>
          <th>Created</th>
          <th>Updated</th>
        </tr>
      </thead>
      <tbody>
        <asp:PlaceHolder ID="itemPlaceHolder" runat="server" />
      </tbody>
    </table>
  </LayoutTemplate>
  <ItemTemplate>
    <tr>
      <td style="width:50px"<%# (Container.DisplayIndex % 2 == 0)?"":" class=\"row-alternating\"" %>>
        <asp:ImageButton ID="lvEditProjectSteps_btnEdit" runat="server" 
          ImageUrl="~/admin/images/icons/edit.gif" 
          AlternateText="Edit" 
          SkinID="interfaceButton"
          CommandName="Edit" />
        <asp:HiddenField ID="lvEditProjectSteps_hdnId" runat="server" Value='<%# Bind("Id")%>' />
        <asp:HiddenField ID="lvEditProjectSteps_hdnStepStatusId" runat="server" Value='<%# Bind("StepStatusId")%>' />
        <asp:HiddenField ID="lvEditProjectSteps_hdnStepStatusStepId" runat="server" Value='<%# Bind("StepStatus_StepId")%>' />
      </td>
      <td style="width:30px"<%# (Container.DisplayIndex % 2 == 0)?"":" class=\"row-alternating\"" %>><asp:Image ID="imgStatus" runat="server" /></td>
      <td style="width:75px"<%# (Container.DisplayIndex % 2 == 0)?"":" class=\"row-alternating\"" %>><asp:Literal ID="litTsCreated" runat="server" /></td>
      <td style="width:75px"<%# (Container.DisplayIndex % 2 == 0)?"":" class=\"row-alternating\"" %>><asp:Literal ID="litTsUpdated" runat="server" /></td>
    </tr>
  </ItemTemplate>
  <EditItemTemplate>
    <tr>
      <td style="width:50px"<%# (Container.DisplayIndex % 2 == 0)?"":" class=\"row-alternating\"" %>>
        <asp:ImageButton ID="lvEditProjectSteps_btnUpdate" runat="server" 
          ImageUrl="~/admin/images/icons/save.png" 
          AlternateText="Save" 
          SkinID="interfaceButton"
          CommandName="Update" 
          ValidationGroup="EditProjectStepsSave" />
        <asp:ImageButton ID="lvEditProjectSteps_btnCancel" runat="server" 
          ImageUrl="~/admin/images/icons/cancel.png" 
          AlternateText="Cancel" 
          SkinID="interfaceButton"
          CommandName="Cancel" />
        <asp:HiddenField ID="lvEditProjectSteps_hdnId" runat="server" Value='<%# Bind("Id")%>' />
        <asp:HiddenField ID="lvEditProjectSteps_hdnStepStatusId" runat="server" Value='<%# Bind("StepStatusId")%>' />
        <asp:HiddenField ID="lvEditProjectSteps_hdnStepStatusStepId" runat="server" Value='<%# Bind("StepStatus_StepId")%>' />
      </td>
      <td style="width:180px" colspan="3"<%# (Container.DisplayIndex % 2 == 0)?"":" class=\"row-alternating\"" %>>
        <div><strong>Status</strong></div>
        <div class="radiobuttonlist-status">
          <asp:RadioButtonList ID="lvEditProjectSteps_rblStatus" runat="server"     
            RepeatDirection="Horizontal"    
            AutoPostBack="true"
            OnSelectedIndexChanged="lvEditProjectSteps_rblStatus_OnSelectedIndexChanged">
            <asp:ListItem Value="1"><img src="/images/icon/project-status/1.png" alt="Error" /></asp:ListItem>
            <asp:ListItem Value="2"><img src="/images/icon/project-status/2.png" alt="In Progress" /></asp:ListItem>
            <asp:ListItem Value="3"><img src="/images/icon/project-status/3.png" alt="Complete" /></asp:ListItem>
          </asp:RadioButtonList>
          <asp:RequiredFieldValidator ID="valRequired_lvEditProjectSteps_rblStatus" runat="server" 
            ControlToValidate="lvEditProjectSteps_rblStatus" 
            SetFocusOnError="true"
            Display="Dynamic" 
            ErrorMessage="<br />^ required ^" 
            ValidationGroup="EditProjectStepsSave" />
        </div>
      </td>
    </tr>
  </EditItemTemplate>
</asp:ListView>

Y el código subyacente:

protected void lvEditProjectSteps_OnItemDataBound(object sender, ListViewItemEventArgs e)
{
  if (e.Item.ItemType == ListViewItemType.DataItem)
  {
    var info = (ProjectStepInfo)DataBinder.GetDataItem(e.Item);

    // View Item
    var litTsCreated = (Literal)e.Item.FindControl("litTsCreated");
    var litTsUpdated = (Literal)e.Item.FindControl("litTsUpdated");
    var imgStatus = (Image) e.Item.FindControl("imgStatus");

    if (litTsCreated != null) litTsCreated.Text = String.Format("{0:d}", info.TsCreated);
    if (litTsUpdated != null) litTsUpdated.Text = String.Format("{0:d}", info.TsCreated);
    if (imgStatus != null) imgStatus.ImageUrl = String.Format("/images/icon/project-status/{0}.png", info.StepStatus_StatusId);

    // Edit Item
    var lvEditProjectSteps_rblStatus = (RadioButtonList) e.Item.FindControl("lvEditProjectSteps_rblStatus");
    if (lvEditProjectSteps_rblStatus != null) lvEditProjectSteps_rblStatus.SelectedValue = info.StepStatus_StatusId.ToString();
  }
}
protected void lvEditProjectSteps_OnItemUpdating(object sender, ListViewUpdateEventArgs e)
{
  if (IsValid)
  {
    var oController = new Controller();
    var lvEditProjectSteps_hdnStepStatusId = (HiddenField) lvEditProjectSteps.EditItem.FindControl("lvEditProjectSteps_hdnStepStatusId");
    var lvEditProjectSteps_hdnStepStatusStepId = (HiddenField) lvEditProjectSteps.EditItem.FindControl("lvEditProjectSteps_hdnStepStatusStepId");
    var lvEditProjectSteps_rblStatus = (RadioButtonList) lvEditProjectSteps.EditItem.FindControl("lvEditProjectSteps_rblStatus");
    var infoStepStatus = oController.StepStatus_SelectOne_StepId_StatusId(Convert.ToInt32(lvEditProjectSteps_hdnStepStatusStepId.Value), Convert.ToInt32(lvEditProjectSteps_rblStatus.SelectedValue));
    if (lvEditProjectSteps_hdnStepStatusId != null)
    {
      e.NewValues["ProjectId"] = Convert.ToInt32(lvEditProjectSteps_hdnProjectId.Value);
      e.NewValues["StepStatusId"] = infoStepStatus.Id;
    }
    else
    {
      Response.Write("cancel");
      e.Cancel = true;
    }
  }
  else
  {
    Response.Write("cancel, not valid");
    e.Cancel = true;
  }
}
protected void lvEditProjectSteps_rblStatus_OnSelectedIndexChanged(object sender, EventArgs e)
{
  var oController = new Controller();
  var rbl = (RadioButtonList)sender;
  var lvEditProjectSteps_txtText = (TextBox) rbl.NamingContainer.FindControl("lvEditProjectSteps_txtText");
  var lvEditProjectSteps_txtComment = (TextBox)rbl.NamingContainer.FindControl("lvEditProjectSteps_txtComment");
  var lvEditProjectSteps_hdnStepStatusStepId = (HiddenField) rbl.NamingContainer.FindControl("lvEditProjectSteps_hdnStepStatusStepId");
  if (!String.IsNullOrEmpty(lvEditProjectSteps_hdnStepStatusStepId.Value) && lvEditProjectSteps_txtText != null && lvEditProjectSteps_txtComment != null)
  {
    var infoStep = oController.Step_SelectOne(Convert.ToInt32(lvEditProjectSteps_hdnStepStatusStepId.Value));
    var infoStepStatus = oController.StepStatus_SelectOne_StepId_StatusId(Convert.ToInt32(lvEditProjectSteps_hdnStepStatusStepId.Value), Convert.ToInt32(rbl.SelectedValue));

    lvEditProjectSteps_txtText.Text = infoStep.Name;
    lvEditProjectSteps_txtComment.Text = infoStepStatus.Text;
  }
}

Answer 1

Resolví mi propio problema. Parece que hay un error al seleccionar un ListViewItem de edición como este (usando el ejemplo anterior):

lvEditProjectSteps.EditItem

pero no cuando usas este método:

lvEditProjectSteps.Items[lvEditProjectSteps.EditIndex]

espero que esto ayude a alguien más.