加载用户的按钮单击动态控制 [英] Load user control dynamically on Button Click
问题描述
我有一个标签，这是我在用户控件添加一个文本框。
I have a label and a text box which i have added in the user control.
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="AddMultiLoc.ascx.cs" Inherits="CRM_Streamline_Forms.UserControls.AddMultiLoc" %>
<table>
<tr>
<td style="width:25%">
<asp:Label ID="lblLocName_UC_G0138" runat="server" Text="Location Name:" />
</td>
<td style="width:25%">
<asp:TextBox ID="txtLocName_UC_G0138" runat="server" Width="200px" />
</td>
<td style="width:25%">
<asp:Label ID="lblLocID_UC_G0138" runat="server" Text="Location ID:" />
</td>
<td style="width:25%">
<asp:TextBox ID="txtLocID_UC_G0138" runat="server" Width="200px" />
</td>
</tr>
我有一个链接按钮在其中点击时要填充这个用户控制我的aspx页面之一。
I have a link button in one of my aspx pages which is when clicked should populate this user control.
<asp:LinkButton ID="lnkAddLoc_AGBI2_G0138" runat="server" Text="+ Add Another Location" onclick="lnkAddLoc_AGBI2_G0138_Click" />
code后面，我写了这个code为按钮点击：
Code behind, I have written this code for the button click:
protected void lnkAddLoc_AGBI2_G0138_Click(object sender, EventArgs e)
{
AddMultiLoc con = (AddMultiLoc)LoadControl("~/UserControls/AddMultiLoc.ascx");
pnlMultiInvoiceInfo1_AGBI2_G0138.Controls.Add(con);
Panel p = new Panel();
Control uc = (Control)Page.LoadControl("~/UserControls/AddMultiLoc.ascx");
p.Controls.Add(uc);
p.Width = 200;
p.Height = 100;
pnlMultiInvoiceInfo1_AGBI2_G0138.Controls.Add(p);
}
因为我称它在aspx页面第一次用户控件被填充，但是当我点击链接按钮第二次，它不填充第二次的用户控件。是新的编码，请帮助：（
First time the user control is populated as am calling it in the aspx page, but second time when i click on the link button, it is not populating the user control for the second time. Am new to coding, please help :(
推荐答案
我觉得现在的问题是，你是跨回传失去你的控件的控件到ViewState中加载。
The problem I think is that you are losing your controls across postback as the controls are loaded in to the ViewState.
下面是一个示例，你可以加载到是不是真的好做法会话的控制，但它会满足您的需要：
Here is a sample where you can load the controls in to the Session which is not really good practice but it will work for your purposes:
AddMultiLocPage.aspx
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:LinkButton ID="lnkAddLoc_AGBI2_G0138" runat="server" Text="+ Add Another Location" OnClick="lnkAddLoc_AGBI2_G0138_Click" />
</div>
<asp:PlaceHolder runat="server" ID="Placeholder1"></asp:PlaceHolder>
</form>
</body>
</html>
AddMultiLocPage.aspx.cs
public partial class AddMultiLocPage : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
LoadControlsFromSession();
}
private List<AddMultiLoc> ViewStateControls
{
get { return (List<AddMultiLoc>) Session["ViewStateControls"]; }
set { Session["ViewStateControls"] = (List<AddMultiLoc>)value; }
}
private void LoadControlsFromSession()
{
if (ViewStateControls != null)
{
Placeholder1.Controls.Clear();
foreach (var c in ViewStateControls)
{
Placeholder1.Controls.Add(c);
}
}
}
protected void lnkAddLoc_AGBI2_G0138_Click(object sender, EventArgs e)
{
var con = (AddMultiLoc)LoadControl("~/AddMultiLoc.ascx");
con.ID = Guid.NewGuid().ToString();
List<AddMultiLoc> tmpList = ViewStateControls;
if(tmpList == null) tmpList = new List<AddMultiLoc>();
tmpList.Add(con);
ViewStateControls = tmpList;
LoadControlsFromSession();
}
}
用户控件的标记
<table>
<tr>
<td style="width: 25%">
<asp:Label ID="lblLocName_UC_G0138" runat="server" Text="Location Name:" />
</td>
<td style="width: 25%">
<asp:TextBox ID="txtLocName_UC_G0138" runat="server" Width="200px" />
</td>
<td style="width: 25%">
<asp:Label ID="lblLocID_UC_G0138" runat="server" Text="Location ID:" />
</td>
<td style="width: 25%">
<asp:TextBox ID="txtLocID_UC_G0138" runat="server" Width="200px" />
</td>
</tr>
</table>
这篇关于加载用户的按钮单击动态控制的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
