Binding Combobox Using Dictionary as the Datasource

Question

I m using  NET 2 0 and I m trying to bind a combobox s Datasource to a sorted dictionary   So the error I m getting is  DataMember property  Key  cannot be found on the Datasource            SortedDictionary lt string  int gt  userCache   UserCache getSortedUserValueCache            userListComboBox DataSource   new BindingSource userCache   Key      This line is causing the error         userListComboBox DisplayMember    Key           userListComboBox ValueMember    Value

User · Accepted Answer

SortedDictionary lt string  int gt  userCache   new SortedDictionary lt string  int gt        a   1       b   2       c   3     comboBox1 DataSource   new BindingSource userCache  null   comboBox1 DisplayMember    Key   comboBox1 ValueMember    Value     But why are you setting the ValueMember to  Value   shouldn t it be bound to  Key   and DisplayMember to  Value  as well

User · Answer

If this doesn t work why not simply do a foreach loop over the dictionary adding all the items to the combobox   foreach var item in userCache        userListComboBox Items Add new ListItem item Key  item Value

User · Answer

A dictionary cannot be directly used as a data source  you should do more   SortedDictionary lt string  int gt  userCache    UserCache getSortedUserValueCache    KeyValuePair lt string  int gt     ar  new KeyValuePair lt string int gt  userCache Count   userCache CopyTo ar  0   comboBox1 DataSource   ar  new BindingSource ar   Key      This line is causing the error comboBox1 DisplayMember    Value   comboBox1 ValueMember    Key

User · Answer

Just Try to do like this      SortedDictionary lt string  int gt  userCache   UserCache getSortedUserValueCache            Add this code     if userCache    null                userListComboBox DataSource   new BindingSource userCache  null      Key   gt  null         userListComboBox DisplayMember    Key           userListComboBox ValueMember    Value

User · Answer

userListComboBox DataSource   userCache ToList    userListComboBox DisplayMember    Key

User · Answer

I know this is a pretty old topic  but I also had a same problem   My solution   how we fill the combobox   foreach  KeyValuePair lt int  string gt  item in listRegion        combo Items Add item Value       combo ValueMember   item Value ToString        combo DisplayMember   item Key ToString        combo SelectedIndex   0      and that s how we get inside    MessageBox Show combo region DisplayMember ToString       I hope it help someone

User · Answer

var colors   new Dictionary  lt  string  string  gt              colors  10      Red     Binding to Combobox          comboBox1 DataSource   new BindingSource colors  null           comboBox1 DisplayMember    Value           comboBox1 ValueMember    Key      Full Source   Dictionary as a Combobox Datasource  Jeryy

User · Answer

I used Sorin Comanescu s solution  but hit a problem when trying to get the selected value  My combobox was a toolstrip combobox  I used the  combobox  property  which exposes a normal combobox   I had a    Dictionary lt Control  string gt  controls   new Dictionary lt Control  string gt       Binding code  Sorin Comanescu s solution - worked like a charm     controls Add pictureBox1   Image     controls Add dgvText   Text     cbFocusedControl ComboBox DataSource   new BindingSource controls  null    cbFocusedControl ComboBox ValueMember    Key    cbFocusedControl ComboBox DisplayMember    Value     The problem was that when I tried to get the selected value  I didn t realize how to retrieve it  After several attempts I got this    var control     KeyValuePair lt Control  string gt   cbFocusedControl ComboBox SelectedItem  Key   Hope it helps someone else

User · Answer

Use --       comboBox1 DataSource   colors ToList      Unless the dictionary is converted to list  combo-box can t recognize its members

[c#] Binding Combobox Using Dictionary as the Datasource

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