删除项目从列表框项目列表

Question

我有列表框中的项目集合。从列表框中删除项目后，我想从列表框中删除该项目，而无需再次重新加载整个集合，这是可能的WinForms？

private void btnDelete_Click(object sender, EventArgs e) 
     { 
      MyData sel = (MyData)listBox1.SelectedItem; 
      if (...delete data) 
      { 
       listBox1.Items.Remove(listBox1.SelectedItem); 
       MessageBox.Show("succ. deleted!"); 
      } 
      else 
      { 
       MessageBox.Show("error!"); 
      }   
     } 

我收到提示

项目集合不能当DataSource属性 设置

Answer 1

嘿尝试从您的收藏选择项指数则删除项目的形式修改收集索引然后再绑定您的列表框收集..

我已经提出示例代码，请refe河

public partial class Form1 : Form 
{ 
    List<String> lstProduct = new List<String>(); 
    public Form1() 
    { 

     InitializeComponent(); 
    } 

    public List<String> BindList() 
    { 

     lstProduct.Add("Name"); 
     lstProduct.Add("Name1"); 
     lstProduct.Add("Name2"); 
     lstProduct.Add("Nam3"); 
     lstProduct.Add("Name4"); 

     return lstProduct; 
    } 

    private void Form1_Load(object sender, EventArgs e) 
    { 
     listBox1.DataSource = BindList(); 
    } 

    private void button1_Click(object sender, EventArgs e) 
    { 
     // The Remove button was clicked. 
     int selectedIndex = listBox1.SelectedIndex; 

     try 
     { 
      // Remove the item in the List. 
      lstProduct.RemoveAt(selectedIndex); 
     } 
     catch 
     { 
     } 

     listBox1.DataSource = null; 
     listBox1.DataSource = lstProduct; 
    } 
} 

希望它可以帮助你....

Answer 2

您应该使用可观察到的集合作为一个DataSource。 您可以使用内置的，如BindingList<T>和ObservableCollection<T>。

但是，您也可以考虑创建自己的集合并实现IBindingList或INotifyCollectionChanged接口。

更新

public partial class YourForm : Form 
{ 
    private BindingList<string> m_bindingList = new BindingList<string>(); 

    private YourForm() 
    { 
     InitializeComponent(); 
     yourListBox.DataSource = m_bindingList; 

     // Now you can add/remove items to/from m_bindingList 
     // and these changes will be reflected in yourListBox. 

     // But you shouldn't (and can't) modify yourListBox.Items 
     // as long as DataSource is set. 
    } 

    private void btnDelete_Click(object sender, EventArgs e) 
    { 
     // Removing items by indices is preferable because this avoids 
     // having to lookup the item by its value. 
     m_bindingList.RemoveAt(yourListBox.SelectedIndex); 
    } 
}