[英]ASP.NET C# can't retrieve info from programmatically added control in GridView tablecell
我正在處理一個小型項目,並使用控件以編程方式在gridview中切換文本。
這是代碼的步驟:
private GridViewRow EnterEditMode(GridView GV, int RowIndex)
{
GridViewRow GVR = GV.Rows[RowIndex];
foreach (TableCell TC in GVR.Cells)
{
if (TC == GVR.Cells[2])
{
PlaceHolder PH = new PlaceHolder();
string CellContent1 = TC.Text;
DropDownList DDL = new DropDownList();
foreach (object s in Enum.GetValues(typeof(Ticket_Status)))
{
DDL.Items.Add(s.ToString());
}
DDL.SelectedValue = CellContent1;
DDL.ID = "I_Status_CB";
DDL.ViewStateMode = System.Web.UI.ViewStateMode.Enabled;
PH.ID = "PH_Status_CB";
PH.ViewStateMode = System.Web.UI.ViewStateMode.Enabled;
PH.Controls.Add(DDL);
this.Page.Controls.Add(PH);
TC.Controls.Add(PH);
}
}
}
現在這是問題所在:
我創建了一個控件,並用創建的控件替換了表格單元中的文本。
問題是我找不到從創建的控件中獲取價值的方法!
我試過我所知道的每種方法,我試過對行,整個表和單元格本身使用普通和遞歸的FindControl()方法。
如果您可以發現問題,或者對此問題有任何想法,請回復!
友好的問候,
-Raybbo。
編輯:
看來我沒有給您足夠的信息來解決我的問題。
我要做的第一件事是將SQL數據庫中的信息綁定到gridview中聲明的BoundFields。
private void GetTable()
{
var Tg = Ticket_Table;
if (sCon != null && sCon.State == ConnectionState.Open)
{
string SQL_Command = "SELECT * FROM Ticket_Table_2013";
SqlDataSource sDsc = new SqlDataSource(SQL_ConnectString, SQL_Command);
SqlDataAdapter sDap = new SqlDataAdapter(SQL_Command,sCon);
DataTable DT = new DataTable();
sDap.Fill(DT);
//This is where i'm adding extra columns for additional commands.
Tg.DataSource = DT;
Tg.DataBind();
sDap.Dispose();
sDsc.Dispose();
}
else { CONNECT(SQL_ConnectString); GetTable(); }
}
這是ASP.Net代碼:
<asp:GridView
ID="Ticket_Table"
CssClass="TableStyle"
ViewStateMode="Enabled"
runat="server"
OnRowUpdating="Ticket_Table_OnRowUpdating"
OnSelectedIndexChanged="Ticket_Table_OnSelectedIndexChanged"
AutoGenerateColumns="false"
AllowPaging="true"
>
<HeaderStyle CssClass="bgBlack02 black center"/>
<RowStyle CssClass="bgBlack01 center" />
<SelectedRowStyle CssClass="bgBlack02" />
<Columns>
<asp:TemplateField>
<ItemTemplate>
<div class="CmdImgWrap" id="CommandBox" runat="server">
<asp:ImageButton ID="I_Remove" CssClass="CmdImg" ImageUrl="style/Icons/Trashcan.png" runat="server" ToolTip="Remove entire row." OnClick="I_Remove_OnClick"/>
<asp:ImageButton ID="I_Edit" CssClass="CmdImg" ImageUrl="style/Icons/EditFile.png" runat="server" ToolTip="Enable edit mode." OnClick="I_Edit_OnClick"/>
<asp:ImageButton ID="I_Accept" CssClass="CmdImg" ImageUrl="style/Icons/Accept.png" Visible="false" runat="server" ToolTip="Accept changes." OnClick="I_Accept_OnClick"/>
<asp:ImageButton ID="I_Cancel" CssClass="CmdImg" ImageUrl="style/Icons/Cancel.png" Visible="false" runat="server" ToolTip="Disgard changed." OnClick="I_Cancel_OnClick"/>
<asp:ImageButton ID="I_Highlight" CssClass="CmdImg" ImageUrl="style/Icons/HighLight.png" runat="server" ToolTip="Highlight entire row." OnClick="I_Highlight_OnClick"/>
</div>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Ticket_ID" HeaderText="Ticket ID" SortExpression="Ticket_ID" />
<asp:BoundField DataField="Ticket_Status" HeaderText="Ticket status" SortExpression="Ticket_Status" />
<asp:BoundField DataField="Ticket_Title" HeaderText="Ticket title" SortExpression="Ticket_Title" />
<asp:BoundField DataField="Ticket_Description" HeaderText="Description" SortExpression="Ticket_Description" />
<asp:BoundField DataField="CompanyName" HeaderText="Company name" SortExpression="CompanyName" />
</Columns>
<PagerTemplate>
<asp:Button ID="Previous" runat="server" CommandName="Previous" Text="<"/>
<asp:Button ID="Next" runat="server" CommandName="Next" Text=">"/>
<asp:Button ID="Refresh" runat="server" CommandName="Refresh" Text="Refresh" />
<asp:Button ID="Update" runat="server" CommandName="Update" Text="Update" />
</PagerTemplate>
</asp:GridView>
在aspview面板之類的Gridview Cell中定義一個容器。 並將控件添加到容器,而不是直接添加到表單元格。
在網格視圖的TemplateField
的ItemTemplate
中使用ASP.NET PlaceHolder
控件,如下所示:
<asp:GridView ID="GridView1" runat="server"
OnRowDataBound="GridView1_RowDataBound">
<Columns>
<asp:TemplateField HeaderText="Countries">
<ItemTemplate>
<asp:PlaceHolder ID="PlaceHolder1" runat="server">
</asp:PlaceHolder>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
現在,在您的代碼中,您可以“查找” PlaceHolder1
並向其中添加任何內容。 我建議在RowDataBound
事件中執行此操作,如下所示:
protected void CustomersGridView_RowDataBound(Object sender, GridViewRowEventArgs e)
{
// Only work with data rows, ignore header or footer rows
if(e.Row.RowType == DataControlRowType.DataRow)
{
// Put logic here to find the placeholder and add controls to it
}
}
在DataBind
網格視圖之前,請勿調用代碼。 從那里刪除代碼並在RowDataBound
事件中調用
沒有測試過,可能會有一些錯誤。
void GVR_RowDataBound(Object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
string CellContent1 = TC.Text;
DropDownList DDL = new DropDownList();
foreach (object s in Enum.GetValues(typeof(Ticket_Status)))
{
DDL.Items.Add(s.ToString());
}
DDL.SelectedValue = CellContent1;
DDL.ID = "I_Status_CB";
e.Row.Cells[2].Controls.Add(DDL);
}
}
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