使用Dictionary作为数据源绑定组合框

Question

我正在使用.NET 2.0,我正在尝试将组合框的数据源绑定到排序字典.

所以我得到的错误是"DataMember属性'Key'无法在数据源上找到".

        SortedDictionary<string, int> userCache = UserCache.getSortedUserValueCache();
        userListComboBox.DataSource = new BindingSource(userCache, "Key"); //This line is causing the error
        userListComboBox.DisplayMember = "Key";
        userListComboBox.ValueMember = "Value";

Answer 1

SortedDictionary<string, int> userCache = new SortedDictionary<string, int>
{
  {"a", 1},
  {"b", 2},
  {"c", 3}
};
comboBox1.DataSource = new BindingSource(userCache, null);
comboBox1.DisplayMember = "Key";
comboBox1.ValueMember = "Value";

但是你为什么要设置ValueMember为"值",它不应该被绑定到"键"(以及DisplayMember"值")？

Answer 2

我使用了Sorin Comanescu的解决方案,但在尝试获取所选值时遇到了问题.我的组合框是一个工具条组合框.我使用了"combobox"属性,它暴露了一个普通的组合框.

我曾有一个

 Dictionary<Control, string> controls = new Dictionary<Control, string>();

绑定代码(Sorin Comanescu的解决方案 - 像魅力一样工作):

 controls.Add(pictureBox1, "Image");
 controls.Add(dgvText, "Text");
 cbFocusedControl.ComboBox.DataSource = new BindingSource(controls, null);
 cbFocusedControl.ComboBox.ValueMember = "Key";
 cbFocusedControl.ComboBox.DisplayMember = "Value";

问题是,当我试图获取所选值时,我没有意识到如何检索它.经过几次尝试,我得到了这个:

 var control = ((KeyValuePair<Control, string>) cbFocusedControl.ComboBox.SelectedItem).Key

希望它可以帮助别人!

Answer 3

        var colors = new Dictionary < string, string > ();
        colors["10"] = "Red";

绑定到Combobox

        comboBox1.DataSource = new BindingSource(colors, null);
        comboBox1.DisplayMember = "Value";
        comboBox1.ValueMember = "Key"; 

Full Source ... 字典作为Combobox数据源

Jery​​y

Answer 4

userListComboBox.DataSource = userCache.ToList();
userListComboBox.DisplayMember = "Key";