[英]Visual Basic subprocedure issue
我正在開發Visual Studio Web開發人員的一些.NET代碼,我遇到了問題。 當我雙擊設計視圖中的按鈕而不是加載子程序時,它所做的只是突出顯示: <asp:Button ID="btnEnter" runat="server" Text="Enter" onclick="btnEnter_Click" />
當我試圖運行它只是為了看看會發生什么,我得到這個錯誤: Line 8: <asp:Button ID="btnEnter" runat="server"
Compiler Error Message: BC30456: 'btnEnter_Click' is not a member of 'ASP.default_aspx'.
如果我擦除了onclick="btnEnter_Click"
並運行它,它就可以了。 無論哪種方式,當我雙擊按鈕/元素時,它不應該為我創建一個類似的子程序嗎? Protected Sub TextBox1_TextChanged(sender As Object, e As EventArgs)
End Sub
我嘗試輸入那個manaully,但關鍵字不會變成藍色或任何顏色,當我運行它時,它只是在我的其他元素的webform上顯示為文本。 以下是我到目前為止的所有內容:
<%@ Page Title="Home Page" Language="VB"%>
<form id="form1" runat="server">
<asp:Label ID="Label1" runat="server" Text="Enter a person's name below"></asp:Label>
<p>
<asp:TextBox ID="txtStudentName" runat="server"></asp:TextBox>
</p>
<p>
<asp:Button ID="btnEnter" runat="server"
Text="Enter" onclick="btnEnter_Click" />
</p>
<p>
<asp:Button ID="btnDisplay" runat="server" Text="Display all and exit" />
</p>
<p>
<asp:Label ID="lbl2" runat="server" Text=" "></asp:Label>
</p>
<p>
<asp:Label ID="lbl3" runat="server" Text=" "></asp:Label>
</p>
<p>
<asp:Label ID="lbl4" runat="server" Text=" "></asp:Label>
</p>
<p>
<asp:Label ID="lbl5" runat="server" Text=" "></asp:Label>
</p>
</form>
編輯:
當我在default.aspx.vb文件中輸入我的代碼時,它會突出顯示關鍵字等,但它不能引用我在設計視圖中創建的元素。
部分類_Default繼承System.Web.UI.Page
結束班
Class Lab1
Protected Sub TextBox1_TextChanged(sender As Object, e As EventArgs)
End Sub
Public Const length As Integer = 3
Shared counter2 As Integer = 0
Public Shared studentList As String() = New String(2) {}
Protected Sub btnEnter_Click(sender As Object, e As EventArgs)
Label1.Text = "Enter a person's name"
Dim studentName As [String] = txtStudentName.Text
If studentList.Length <= length Then
If txtStudentName.Text <> "" Then
Dim match As [Boolean] = True
Dim i As Integer = 0
While counter2 >= i
If studentList(i) IsNot Nothing Then
If studentList(i).ToUpper() = txtStudentName.Text.ToUpper() Then
match = False
Label1.Text = "This name has already been used"
End If
End If
i += 1
End While
If match = True Then
studentList(counter2) = txtStudentName.Text
counter2 += 1
End If
End If
End If
End Sub
End Class
您的Page
聲明似乎表明您使用的是inline
樣式:
<%@ Page Title="Home Page" Language="VB"%>
這意味着你的代碼/應在 aspx
文件本身的script runat="server"
標簽:
<%@ Page Language="VB" %>
<!DOCTYPE html>
<script runat="server">
Protected Sub Button1_Click(sender As Object, e As EventArgs)
'Do something
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
</div>
</form>
</body>
</html>
但是,您的其他代碼表明您似乎想要使用code-behind
模型,您擁有.vb
文件(例如foo.aspx.vb
)
對於網站, Page
被聲明為這樣(對於Web 應用程序 ,它將說CodeBehind="foo.aspx.vb"
):
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="foo.aspx.vb" Inherits="foo" %>
foo.asp.vb
文件 Class Lab1
是什么...... foo.aspx.vb
:
Partial Class foo
Inherits System.Web.UI.Page
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
'Do something
End Sub
End Class
“修復”適合您:
inline
或code-behind
Page
inline
,您的代碼將在aspx文件中 code-behind
,您的代碼將存在,並且應該封裝在頁面的Class file
中。
Page
聲明實際上是這樣說的:
CodeFile="foo.aspx.vb"
是代碼所在的文件 Inherits="foo"
是Partial Class
文件中的( Partial Class foo
) 嘗試這個
Private Sub btnEnter_Click(sender As Object, e As System.EventArgs) Handles btnEnter.Click
End Sub
這里, btnEnter_Click是您的事件名稱,並在過程聲明的末尾使用Handles關鍵字使其處理由對象變量引發的事件
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