当数据源是字典< int，string>时，清除并添加组合框项目。

问题描述

<pre lang="c#">

cmbSourceTag1.DataSource = new BindingSource（objSource，null）;

cmbSourceTag1.DisplayMember = 价值;

cmbSourceTag1.ValueMember =Key;





如何删除和添加新的组合框的项目？

其中objSource是

cmbSourceTag1.DataSource = new BindingSource(objSource, null);
cmbSourceTag1.DisplayMember = "Value";
cmbSourceTag1.ValueMember = "Key";


how to remove and add new items to combobox ?
where objSource is

Dictionary<int, string>

我的尝试：

What I have tried:

cmbSourceTag2.Items.RemoveAt(((KeyValuePair<int, string>)cmbSourceTag2.Items[2]).Key);

它会抛出错误

有人有想法从组合框中删除和添加项目吗？



谢谢

it will throw the error
anyone have an idea to remove and add item from combobox?

Thanks

推荐答案

private void RemoveFromDictionary_Click(Object sender, EventArgs e) {
  if (cbx.SelectedIndex != -1) {
    KeyValuePair<int, string> item = (KeyValuePair<int, string>)cbx.SelectedItem;
    // Remove from dictionary
    dic.Remove(item.Key);
    // Force the BindingSource to recreate the intermediate BindingList
    // and refresh the combobox
    cbxBindingSource.DataSource = null;
    cbxBindingSource.DataSource = dic;
  }
}

如果您可以重新设计程序直接使用BindingList而不是字典，代码将变得更加简单。 />

If you can redesign your program to use a BindingList directly instead of the dictionary, the code will become much simpler.

 private void RemoveFromList_Click(Object sender, EventArgs e) {
  if (cbx.SelectedIndex != -1) {
    bindlist.RemoveAt(cbx.SelectedIndex);
  }
}

Alan。

Alan.

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