Question

我有一个xml文件，如下所示：

<Accounts>
  <Account Id="1">
    <UserName>xxx@Hotmail.com</UserName>
    <Password>xxx</Password>
    <AddingDate>06 Mart 2015 Cuma</AddingDate>
    <AccountType>Hotmail</AccountType>
  </Account>

我使用Dictionarylist来保存用户名和密码值。我只显示这样的用户名：

private void AddAccounts(CheckedListBox chkListBox)
{
    XDocument doc = XDocument.Load("UserAccounts.xml");
    Dictionary<string, string> dict = doc.Descendants("Account")
        .GroupBy(x => x.Element("UserName"), y => y)
        .ToDictionary(x => x.Key.Value, y => y.First().Element("Password").Value);
    foreach (var v in dict)
    {
        checkedListBox1.Items.Add(v.Key);
    }
}

然后。一旦SelectedIndexChanged事件被触发，我试图从checkedListBox获取这个DictionaryList。就像这样

private void checkedListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    XDocument doc = XDocument.Load("UserAccounts.xml");

    var dataSource = checkedListBox1.DataSource as Dictionary<string, string>;

    if (c != null)
    {
        var password_ = c.Where(x => x.Key.Equals("")).Select(x => x.Value).FirstOrDefault();
    }
}

问题在于以下部分

var dataSource = checkedListBox1.DataSource as Dictionary<string, string>;

为空。断点永远不会进入这部分

if (c != null){}

这部分。我很确定AddAccounts功能是我测试过的吗

Answer 1

您无法将项目添加到CheckedListBox并将其作为DataSource返回。

如果要将Dictionary设置为CheckedListBox的DataSource，您可以像这样分配它

// delete this lines...
//foreach (var v in dict)
//{
//    checkedListBox1.Items.Add(v.Key);
//}

checkedListBox1.DataSource = new BindingSource(dict, null);
checkedListBox1.DisplayMember = "Value";
checkedListBox1.ValueMember = "Key";

并且在您的SelectedIndexChanged事件中，您必须像这样分配dataSource

var dataSource = checkedListBox1.DataSource as BindingSource;
var dict = dataSource.DataSource as Dictionary<string, string>;

希望这有帮助！

ChekedListBox with Dictionary as dataSource

1 个答案: