Question

我是贝琳达。现在只有我学习asp.net控件..我试过以下代码。但是我收到了一个错误..

我已经使用代码将哈希表与listbox绑定，但我不能。

任何人都请帮我理解哈希表和绑定概念......

的.aspx

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Hashtable.aspx.vb" Inherits="Hashtable" %>

<!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 id="Head1" runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
        <br />
        <asp:ListBox ID="ListBox1" runat="server"></asp:ListBox><br />
    </div>
    </form>
</body>
</html>

.aspx.vb：

#Region "Namespaces"

Imports System.Data
Imports System.IO
Imports System.Net.Mail

#End Region
Partial Class Hashtable
    Inherits System.Web.UI.Page

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim ht As New Hashtable
        ht.Items.Add("1", "Sunday")
        ht.Items.Add("2", "Monday")
        ht.Items.Add("3", "Tuesday")
        ht.Items.Add("4", "Wednesday")
        ht.Items.Add("5", "Thursday")
        ht.Items.Add("6", "Friday")
        ht.Items.Add("7", "Saturday")

        ListBox1.DataSource = ht
        ListBox1.DataValueField = "Key"
        ListBox1.DataTextField = "Value"
        ListBox1.DataBind()


    End Sub
End Class

Answer 1

我认为可以将数据绑定到哈希表。

这样的事情应该有效

Hashtable myHashTable = new HashTable();
myHashTable.Add ("First", "The first item");
myHashTable.Add ("Second", "The second item");
myHashTable.Add ("Third", "The third item");


ddlMyDropDownList.DataSource = myHashTable.Keys;
ddlMyDropDownList.DataBind();

在您的代码中：

Partial Class _Default
Inherits System.Web.UI.Page

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click

    Dim ht As Hashtable = New Hashtable(7)
    ht.Add("1", "Sunday")
    ht.Add("2", "Monday")
    ht.Add("3", "Tuesday")
    ht.Add("4", "Wednesday")
    ht.Add("5", "Thursday")
    ht.Add("6", "Friday")
    ht.Add("7", "Saturday")

    ListBox1.DataSource = ht
    ListBox1.DataValueField = "Key"
    ListBox1.DataTextField = "Value"
    ListBox1.DataBind()

End Sub

结束班

Answer 2

不要使用旧的Hashtable类，而是使用替换字典。（几乎）来自System.Collections命名空间的所有类都是如此。

虽然你可以尝试

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim ht As New Hashtable
        ht.Items.Add("1", "Sunday")
        ht.Items.Add("2", "Monday")
        ht.Items.Add("3", "Tuesday")
        ht.Items.Add("4", "Wednesday")
        ht.Items.Add("5", "Thursday")
        ht.Items.Add("6", "Friday")
        ht.Items.Add("7", "Saturday")

       foreach (var item in ht)
    {
        ListBox1.Items.Add(item.Value)
    }


    End Sub

如何将哈希表与listbox绑定

2 个答案: