在组合框中添加更多组合框包含值和文本

Question

我已经创建了一个名为ComboBoxitem的类，它有两个属性：值和文本。

public class ComboBoxItem 
{ 
    public string Value; 

    public string Text; 

    public ComboBoxItem(string val, string text) 
    { 

     Value = val; 

     Text = text; 
    } 
    public override string ToString() 
    { 
     return Text; 
    } 

} 

现在我想喜欢每次值和文本添加到comboboxitem

事情是这样的：

public ComboBoxItem busstops; 

     private void Form1_Load(object sender, EventArgs e) 
     { 
      lblText.Text = "Timetable Bushours for " + "New Bridge Street-St Dominics"; 

      busstops = new ComboBoxItem("410000015503", "New Bridge Street-St Dominics"); 
      busstops = new ComboBoxItem("410000015552", "Bothal Street (N-Bound), Byker "); 

     /* comboBox1.Items.Add(new ComboBoxItem ("410000015503", "New Bridge Street-St Dominics")); 
      comboBox1.Items.Add(new ComboBoxItem("410000015552", "Bothal Street (N-Bound), Byker "));*/ 


      comboBox1.Items.Add(busstops); 
     } 

但问题是只添加的最后一个项目（正常，因为我总是说新的ComboboxItem）但如何改变他总是可以添加新组合框的代码？

谢谢！

Answer 1

这两个ComboBox项目都是不同的对象，所以你需要两个ComboBox变量来存储它们。

busstops1 = new ComboBoxItem("410000015503", "New Bridge Street-St Dominics"); 
busstops2 = new ComboBoxItem("410000015552", "Bothal Street (N-Bound), Byker "); 


comboBox1.Items.Add(busstops1); 
comboBox1.Items.Add(busstops2); 

Answer 2

将它添加到每次comboBox1.Items您更新busstops实例。

 private void Form1_Load(object sender, EventArgs e) 
     { 
      lblText.Text = "Timetable Bushours for " + "New Bridge Street-St Dominics"; 

      busstops = new ComboBoxItem("410000015503", "New Bridge Street-St Dominics"); 
      comboBox1.Items.Add(busstops); 

      busstops = new ComboBoxItem("410000015552", "Bothal Street (N-Bound), Byker "); 
      comboBox1.Items.Add(busstops); 
     } 

Answer 3

您应该在每次分配后添加。

 busstops = new ComboBoxItem("410000015503", "New Bridge Street-St Dominics"); 

     comboBox1.Items.Add(busstops); // Add this line 

     busstops = new ComboBoxItem("410000015552", "Bothal Street (N-Bound), Byker "); 
     comboBox1.Items.Add(busstops); 

Answer 4

让ComboBoxItems的列表，添加项目到列表中，并设置数据源comboBox1到列表：

List<ComboBoxItem> Items = new List<ComboBoxItem>(); 
    comboBox1.DataSource = Items; 

Answer 5

private void Form1_Load(object sender, EventArgs e) 
    { 
     lblText.Text = "Timetable Bushours for " + "New Bridge Street-St Dominics"; 

     busstops = new ComboBoxItem("410000015503", "New Bridge Street-St Dominics"); 
     comboBox1.Items.Add(busstops);//add this line here 

     busstops = new ComboBoxItem("410000015552", "Bothal Street (N-Bound), Byker "); 
     comboBox1.Items.Add(busstops);//and again here 
    } 

，因为你要添加的值相同，你必须添加每次它发生变化时都会有这个值通过声明new，你实际上正在取代和覆盖旧的价值。