回發的動態用戶控件Asp.Net

我創建了一個項目user_control，它有一個文本框，按鈕等，它將故意收集用戶想要的項目總數。回發的動態用戶控件Asp.Net

我動態地在page_load上創建了一些user_control實例。如果您單擊項目數量的添加按鈕，它將添加到會話變量。但是，當用戶在文本框中輸入不同的數量並單擊添加按鈕時，總數就是文本框的原始值。

如何獲取用戶輸入到文本框中的值以添加到總共？

我有下面創建一個精簡例如：用戶控件] [首頁] [代碼隱藏]

用戶控件...

<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="BomItem.ascx.vb" Inherits="DynamicUserControl.BomItem" %> 
<style type="text/css"> 
.panel 
{ 
    width: 700px; 
    padding: 5px; 
} 

.button 
{ 
    margin-right: 10px; 
} 
.label 
{ 
    float: left; 
    margin-right: 10px; 
} 
</style> 
<asp:Panel ID="Panel1" CssClass="panel" runat="server"> 
    <asp:Label ID="PartNumberLabel" CssClass="label" Width="100px" runat="server" Text="123456"></asp:Label> 
    <asp:Label ID="DescriptionLabel" CssClass="label" Width="350" runat="server" Text="This is a sample description."></asp:Label> 
    <asp:Button ID="AddButton" CssClass="button" runat="server" Text="Add" Width="100px" /> 
    <asp:TextBox ID="QuantityTextBox" runat="server" Width="100" Text="1" AutoPostBack="false"></asp:TextBox> 
</asp:Panel>

頁...

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="DynamicUserControl._Default" %> 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head runat="server"> 
    <title></title> 
</head> 
<body> 
<form id="form1" runat="server"> 
<div> 
    <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder> 
    <br /> 
    <br /> 
    <asp:Button ID="Button1" runat="server" Text="Get Total Quantity" /> 
    <br /> 
    <br /> 
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> 
    <br /> 
    <br /> 
</div> 
</form> 
</body> 
</html>

代碼隱藏...

Public Class _Default 
Inherits System.Web.UI.Page 

Protected Overrides Sub OnInit(e As System.EventArgs) 
    MyBase.OnInit(e) 
    'Dynamically load the user controls on the page 
    For i = 0 To 2 
     Dim BomItem1 As System.Web.UI.UserControl = LoadControl("BomItem.ascx") 
     BomItem1.ID = "BomItem" & i 

     PlaceHolder1.Controls.Add(BomItem1) 
    Next 
End Sub 


Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load 

    ''***This questioned answered by James and Edited 
    ''to reflect the answer. 
    ''Put the commented code below in the OnInit Method above. 
    ''Dynamically load the user controls on the page 
    'For i = 0 To 2 
    ' Dim BomItem1 As System.Web.UI.UserControl = LoadControl("BomItem.ascx") 
    ' BomItem1.ID = "BomItem" & i 
    '    
    ' PlaceHolder1.Controls.Add(BomItem1) 
    'Next 

    'Collect the quantities that the user has entered 
    If IsPostBack Then 
     Dim ctrl As Control = GetPostBackControl(Me.Page) 
     If ctrl IsNot Nothing Then 
      If ctrl.ID.EndsWith("AddButton") Then 
       CollectQuantity(ctrl) 
      End If 
     End If 
    End If 

End Sub 

Public Function GetPostBackControl(page As Page) As Control 
    Dim control As Control = Nothing 

    Dim ctrlname As String = page.Request.Params.[Get]("__EVENTTARGET") 
    If ctrlname IsNot Nothing AndAlso ctrlname <> String.Empty Then 
     control = page.FindControl(ctrlname) 
    Else 
     For Each ctl As String In page.Request.Form 
      Dim c As Control = page.FindControl(ctl) 
      If TypeOf c Is System.Web.UI.WebControls.Button Then 
       control = c 
       Exit For 
      End If 

     Next 
    End If 
    Return control 
End Function 

Public Sub CollectQuantity(btn As Button) 
    Dim uc As UserControl = btn.Parent.Parent 
    Dim QuantityTextBox As TextBox = uc.FindControl("QuantityTextBox") 
    Session("TotalQuantity") += CDbl(QuantityTextBox.Text) 
End Sub 

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click 
    TextBox1.Text = Session("TotalQuantity") 
End Sub 

End Class

來源

2011-09-12 TroyS

您可以嘗試在OnPreInit或OnInit事件而不是Page_Load中重新創建控件。我認爲控件在ViewState加載後正在重新創建。 –

@詹姆斯感謝億。是的，工作很棒！我將編輯代碼供其他人查看。我使用了OnInit。如果您可以創建答案，我想標記爲已回答。 – TroyS

很高興你能工作。添加了一個答案。 –

看着喲你的代碼示例，看起來你可能在頁面生命週期中太晚重新創建了控件。嘗試在OnInit期間重新創建控件，看看是否有幫助。

來源

2011-09-12 17:06:47

回發的動態用戶控件Asp.Net

回答

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