DataGridView DataGridViewComboBoxCell value does not change

我有这个数据视图，一些行的单元格可能是一个组合框。我可以绑定组合框并正确初始化，但是当我从该组合框中选择一个项目时，控件的Value属性保持不变，但格式化的值更改为新选择的项目。

下面是我如何将组合框加载到我的网格视图:

private void ADDComboBoxItemToView(string itemName, Languages.LanguagesEnum language = Languages.LanguagesEnum.English)
{
    DataGridViewComboBoxCell c = new DataGridViewComboBoxCell();
    c.DataSource = LanguagesManager.LanguageNames.GetLanguages();
    c.ValueType = typeof(Languages.LanguagesEnum);
    c.Value = language;
    c.ValueMember = "LangID";
    c.DisplayMember = "LangName";
    c.FlatStyle = FlatStyle.System;

    var id = dgItems.Rows.Add(new object[] { filePath });
    dgItems.Rows[id].Cells[1] = c;
}

这是我的数据源类

public class LanguageNames
{
    public Languages.LanguagesEnum LangID { get; set; }
    public int LangNum
    {
        get { return (int) LangID; }
    }
    public string LangName
    {
        get { return GetLanguageName(LangID); }
    }
    private string GetLanguageName(Languages.LanguagesEnum id)
    {
        switch (id)
        {
            case Languages.LanguagesEnum.English:
                return "English";
            case Languages.LanguagesEnum.Finnish:
                return "Finnish";
            case Languages.LanguagesEnum.French:
                return "French";
            default:
                return string.Empty;
        }
    }
    public static List<LanguageNames> GetLanguages()
    {
        return _languages;
    }
    private static readonly List<LanguageNames> _languages = new List<LanguageNames>
    {
            new LanguageNames{LangID = Languages.LanguagesEnum.English},
            new LanguageNames{LangID = Languages.LanguagesEnum.Finnish},
            new LanguageNames{LangID = Languages.LanguagesEnum.French}
    };
}

我是这样处理选择改变事件的:

private void dgItems_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
    if (dgItems.CurrentCell.ColumnIndex == 1 && e.Control is ComboBox)
    {
        ComboBox comboBox = e.Control as ComboBox;
        comboBox.SelectedIndexChanged += LastColumnComboSelectionChanged;
    }
}
private void LastColumnComboSelectionChanged(object sender, EventArgs e)
{
    var currentcell = dgItems.CurrentCellAddress;
    DataGridViewTextBoxCell celItem = (DataGridViewTextBoxCell)dgItems.Rows[currentcell.Y].Cells[0];
    DataGridViewComboBoxCell celLang = (DataGridViewComboBoxCell)dgItems.Rows[currentcell.Y].Cells[1];
    var item = celItem.Value.ToString();
    var language = (Languages.LanguagesEnum) celLang.Value;
    _IsSaveRequired = true;
}

这里的问题是celLang.Value总是返回English，无论我在组合框中的语言之间改变多少次。然而，如果我调用celLang.FormattedValue，我得到正确的语言字符串。

我确实需要语言值作为Enum，不能从FormattedValue中获益。

如果我不初始化组合框，删除c.Value = language;行，我得到一个"对象引用"异常在var language = (Languages.LanguagesEnum) celLang.Value;和celLang.Value为空;

有人能帮忙吗?

编辑:

这是语言的枚举数:

public enum LanguagesEnum
{
    English,
    Finnish,
    French
}