[英]Dynamic control Viewstate
我现在被困住了。 花了很长时间尝试保持动态添加的linkbutton或标签到gridview后,似乎我正在覆盖回发时的复选框状态。
如前所述,我正在使用以下方法动态地将linkbutton或标签添加到gridview中的占位符:
protected void LedgerGrid_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
int index = e.Row.RowIndex;
if (items[index].noteID > 0)
{
PlaceHolder label = (PlaceHolder)e.Row.FindControl("HasPrevious");
LinkButton link = new LinkButton();
link.CommandName = "LinkCommand";
link.Command += new CommandEventHandler(link_Command);
link.Text = "Yes";
link.ID = index.ToString();
label.Controls.Add(link);
}
else
{
PlaceHolder label = (PlaceHolder)e.Row.FindControl("HasPrevious");
Label noNote = new Label();
noNote.Text = "No";
label.Controls.Add(noNote);
}
这是gridview:
<asp:GridView runat="server" ID="LedgerGrid" AutoGenerateColumns="false"
onselectedindexchanged="LedgerGrid_SelectedIndexChanged"
onrowdatabound="LedgerGrid_RowDataBound" onrowcommand="LedgerGrid_RowCommand"
>
<Columns>
<asp:TemplateField HeaderText="Notes">
<ItemTemplate>
<asp:PlaceHolder ID="HasPrevious" runat="server"></asp:PlaceHolder>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="Invoice Date" DataField="invoicedate" DataFormatString="{0:d}" />
<asp:BoundField HeaderText="Invoice" DataField="invoice" />
<asp:BoundField HeaderText="Fee Debt" DataField="Fee_Debt" DataFormatString="{0:C}" />
<asp:BoundField HeaderText="Cost Debt" DataField="Cost_Debt" DataFormatString="{0:C}" />
<asp:BoundField HeaderText="VAT Debt" DataField="VAT_Debt" DataFormatString="{0:C}" />
<asp:BoundField HeaderText="Total Debt" DataField="Total_Debt" DataFormatString="{0:C}" />
<asp:BoundField HeaderText="Client Code" DataField="ClientCode" />
<asp:ButtonField HeaderText="Matter Number" DataTextField="matternumber" CommandName="ViewMatter" />
<asp:BoundField HeaderText="Decription" DataField="matterdescription" />
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="AddInvoiceCheck" runat="server" Enabled="true" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
为了确保我的链接按钮命令有效,我正在重建Pageview中的gridview。 这是页面加载:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
string clientCode = Server.HtmlEncode(Request.QueryString["clientcode"]);
items = DataAccess.DataAccess.GetLedgerDetails(clientCode);
ViewState["LedgerItems"] = items;
ViewState["clientcode"] = clientCode;
LedgerGrid.DataSource = items;
LedgerGrid.DataBind();
LedgerClientObject clientDetails = DataAccess.DataAccess.GetClientDetails(clientCode);
ClientCodeLabel.Text = string.Format("Group Code: {0}", clientDetails.GroupCode);
ClientNameLabel.Text = string.Format("Client Name: {0}", clientDetails.ClientName);
ClientCodeFilter.DataSource = clientDetails.ClientCodes;
ClientCodeFilter.DataBind();
}
}
为了维护回发时动态添加的控件,我打电话给以下人员:
protected void Page_PreLoad(object sender, EventArgs e)
{
if (IsPostBack)
{
items = (List<LedgerItem>)ViewState["LedgerItems"];
LedgerGrid.DataSource = items;
LedgerGrid.DataBind();
}
}
当然,现在看来,通过使用此方法,我正在覆盖复选框gridview列的状态。 我是不是都错了? 我希望能够使用viewstate来维护动态添加到GridView的控件的设置。 在PreLoad事件中重新加载gridview之前/之后,有什么方法可以访问复选框控件表格gridview的状态吗?
我正在通过单击按钮来检查复选框列的状态,如下所示:
protected void Unnamed1_Click(object sender, EventArgs e)
{
NoteModel note = new NoteModel();
for (int i = 0; i < LedgerGrid.Rows.Count; i++)
{
int invoice = Convert.ToInt32(LedgerGrid.Rows[i].Cells[2].Text);
CheckBox check = (CheckBox)LedgerGrid.Rows[i].FindControl("AddInvoiceCheck");
if (check.Checked)
{
note.invoices.Add(invoice);
}
}
if (note.invoices == null)
{
string clientcode = (string)ViewState["clientcode"];
ViewState["InvoiceError"] = 1;
Response.Redirect(string.Format("Ledger.aspx?clientcode={0}", clientcode));
}
else
{
string clientcode = (string)ViewState["clientcode"];
Session["NoteObject"] = note;
Response.Redirect(string.Format("AddNote.aspx?cc={0}", clientcode));
}
}
每当我遍历gridview中的复选框控件时,它们都不会被选中,例如被我的PreLoad代码覆盖!!!
最后,我决定不使用动态创建的控件。 相反,我在网格视图中添加了一个按钮字段。 然后,在我的rowdatabound事件中,如果按钮确实符合我的标准,则将其可见性设置为false。 这种视图状态得以维护,因为我不需要在回发时创建控件。
Webform似乎最好避免使用动态控件。 我仍然想知道要利用哪个事件来覆盖视图状态重新设置控件?
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