如何對列表進行排序（使用散列表查找項目）

Question

這是我的代碼。我想對列表框進行排序名稱&在列表框上顯示它們。 我使用Hashtable類來搜索Items.So現在我不Konw如何排序我的列表！ 我創建了一個名爲Customer的類，並在我的代碼中使用它！ 感謝這麼多的幫助:-)

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
using System.Collections; 

namespace Structure_Demo 
{ 
public partial class Form1 : Form 
{ 
    //Form level members. 
    public Hashtable objCustomers = new Hashtable(); 
    public ArrayList objCustomer = new ArrayList(); 

    public Form1() 
    { 
     InitializeComponent(); 
    } 
    public Customer SelectedCustomer 
    { 
     get 
     { 
      //Return the selected customer 
      return (Customer)lstCustomers.Items[lstCustomers.SelectedIndex]; 
     } 
    } 
    private void DisplayCustomer(Customer objCustomer) 
    { 
     //Display the customer detils in the form 
     txtName.Text = objCustomer.Name; 
     txtFirstName.Text = objCustomer.FirstName; 
     txtLastName.Text = objCustomer.LastName; 
     txtEmail.Text = objCustomer.Email; 
    } 

    private void btnTest_Click(object sender, EventArgs e) 
    { 
     // Create some customers 
     CreateCustomer("cuser 1", "customer 1", "cu.customer1@ssamail.com"); 
     CreateCustomer("auser 2", "customer 2", "au.customer2@ssamail.com"); 
     CreateCustomer("buser 3", "customer 3", "bu.customer3@ssamail.com"); 
     CreateCustomer("guser 4", "customer 4", "gu.customer4@ssamail.com"); 
     CreateCustomer("euser 5", "customer 5", "eu.customer5@ssamail.com"); 
     CreateCustomer("huser 6", "customer 6", "hu.customer6@ssamail.com"); 
     CreateCustomer("duser 7", "customer 7", "du.customer7@ssamail.com"); 
     CreateCustomer("fuser 8", "customer 8", "fu.customer8@ssamail.com"); 
    } 
    public void CreateCustomer(string FirstName, string LastName, string Email) 
    { 
     //Declare a customer object. 
     Customer objNewCustomer; 
     //Create new customer. 
     objNewCustomer.FirstName = FirstName; 
     objNewCustomer.LastName = LastName; 
     objNewCustomer.Email = Email; 
     //check if customer isn't currctly in the list 
     if (objCustomers.Contains(Email.ToLower()) == false) 
     { 
      //Add new customer to the list 
      objCustomers.Add(Email.ToLower(), objNewCustomer); 
      //Add new customer to the listbox control 
      lstCustomers.Items.Add(objNewCustomer); 
     } 
     else 
     { 
      MessageBox.Show("The customer :" + FirstName + LastName + " currently exit", "Structure Demo"); 
     } 

    } 

    private void btnDelete_Click(object sender, EventArgs e) 
    { 
     //if no customer is selected if form list boe then... 
     if (lstCustomers.SelectedIndex == -1) 
     { 
      //Display a message 
      MessageBox.Show("You must select a customer to delete!","Structure Demo"); 
      //Exit the method 
      return; 
     } 
     //promt the user to delete the selected customer 
     DialogResult result = MessageBox.Show("Are you sure to delete the " + SelectedCustomer.Name + "?", "Structure Demo", MessageBoxButtons.YesNo, MessageBoxIcon.Question); 
     if (result == DialogResult.Yes) 
     { 
      //Get the customer to be deleted 
      Customer objCustomerToDelete = SelectedCustomer; 
      //remove the customer from Arraylist 
      objCustomers.Remove(txtEmail.Text.ToLower()); 
      //remove the customer from the list box 
      lstCustomers.Items.Remove(objCustomerToDelete); 

     } 

    } 

    private void btnLookup_Click(object sender, EventArgs e) 
    { 
     //if customer found in hashtable 
     if (objCustomers.Contains(txtEmail.Text.ToLower()) == true) 

      //Display the customer name 
      MessageBox.Show("The customer name is: " + ((Customer)objCustomers[txtEmail.Text.ToLower()]).Name, "Structure Demo"); 
      else 
      //Display an error message 
      MessageBox.Show("The customer with email address: " + txtEmail.Text + " does not exit!", "Structure Demo"); 

    } 

    private void lstCustomers_SelectedIndexChanged(object sender, EventArgs e) 
    { 
     // Display the customer details 
     DisplayCustomer(SelectedCustomer); 
    } 

    private void btnSort_Click(object sender, EventArgs e) 
    { 
     // 

    } 

Answer 1

不能直接排序哈希表，但你可以使用SortedDictionary作爲替代或維持HashTable的鍵排定的順序，你希望的列表。