将多个值保存为隐藏文件

Question

我使用下面的下拉列表，允许用户选择多个值。

如何将选定的值从下拉列表保存到隐藏字段。

下拉列表

import java.util.Scanner;

public class PF {
    public PF() {
        Scanner keyboard = new Scanner(System.in);
        System.out.println("Enter a line to be checked for profanity: ");
        String sentence = keyboard.nextLine();
        System.out.println("\nYour input line: " + sentence);

        String [] prof = new String []{"cat", "dog", "llama"};
        for (String s : prof)
        {
            if (sentence.toLowerCase().contains(s))
                System.out.println("The sentence contains " + s);
            else 
                System.out.println("The sentence does not contain " + s);
        }       
    }
    public static void main(String...banana) { new PF();}
}

HiddenField

<asp:DropDownList ID="DropDownList1" CssClass="form-control chosen-select" multiple data-placeholder="Multiple Select" runat="server" DataSourceID="SqlDataSource1" DataTextField="Product_Name" DataValueField="Pro_ID"></asp:DropDownList>

Answer 1

您可以这样使用：

string selectedTexts="";
foreach (ListItem item in DropDownList1.Items)
{
    if (item.Selected)
    {
        selectedTexts += item.Text + " : " + item.Value + "\\n";
    }
}
hdnSearchParam.Value= selectedTexts;