Question

我正在尝试获取SelectedItem ComboBox的密钥，但不知道如何获取我所做的代码，

void CboBoxSortingDatagridview(ComboBox sender)
{
    foreach (var v in DictionaryCellValueNeeded)
    {
        if (!DictionaryGeneralUsers.ContainsKey(v.Key) && v.Value.RoleId == Convert.ToInt32(((ComboBox)sender).SelectedItem)) // here getting value {1,Admin} i want key value which is 1 but how?
        {
            DictionaryGeneralUsers.Add(v.Key, (GeneralUser)v.Value);
        }
    }
    dataGridViewMain.DataSource = DictionaryGeneralUsers.Values;
}

我以这种方式绑定了组合框，

cboRolesList.DataSource = new BindingSource(dictionaryRole, null);  
cboRolesList.DisplayMember = "Value";  
cboRolesList.ValueMember = "Key";

Answer 1

在这种情况下，词典只是键值对的集合，因此ComboBox上的每个项目都是KeyValuePair<YourKeyType, YourValueType>。将SelectedItem投射到KeyValuePair<YourKeyType, YourValueType>，然后您就可以阅读密钥。

// get ComboBox from sender
ComboBox comboBox = (ComboBox) sender;

// get selected KVP
KeyValuePair<YourKeyType, YourValueType> selectedEntry
    = (KeyValuePair<YourKeyType, YourValueType>) comboBox.SelectedItem;

// get selected Key
YourKeyType selectedKey = selectedEntry.Key;

或者，更简单的方法是使用SelectedValue属性。

// get ComboBox from sender
ComboBox comboBox = (ComboBox) sender;

// get selected Key
YourKeyType selectedKey = (YourKeyType) comboBox.SelectedValue;

Answer 2

尝试一下：

字符串键=（（（KeyValuePair <字符串，字符串>）comboBox1.SelectedItem）.Key;

如何从ComboBox的SelectedItem获取密钥？

2 个答案: