Get the value for a listbox item by index

Question

This must be very easy but I am stuck  I have a listBox with X Items  Each Item has a text description  Which appears in the listBox  and its value numerical    I want to be able to get the value property of an item  using the index number of the item

User · Answer

It would be  String MyStr   ListBox items 5  ToString

User · Answer

Here I can t see even a single correct answer for this question  in WinForms tag  and it s strange for such frequent question    Items of a ListBox control may be DataRowView  Complex Objects  Anonymous types  primary types and other types  Underlying value of an item should be calculated base on ValueMember   ListBox control has a GetItemText which helps you to get the item text regardless of the type of object you added as item  It really needs such GetItemValue method   GetItemValue Extension Method  We can create GetItemValue Extension Method to get item value which works like GetItemText   using System  using System Windows Forms  using System ComponentModel  public static class ListControlExtensions       public static object GetItemValue this ListControl list  object item                if  item    null              throw new ArgumentNullException  item             if  string IsNullOrEmpty list ValueMember               return item           var property   TypeDescriptor GetProperties item  list ValueMember           if  property    null              throw new ArgumentException                  string Format  item doesn t contain   0   property or column                    list ValueMember            return property GetValue item             Using above method you don t need to worry about settings of ListBox and it will return expected Value for an item  It works with List lt T gt   Array  ArrayList  DataTable  List of Anonymous Types  list of primary types and all other lists which you can use as data source  Here is an example of usage     Gets underlying value at index 2 based on settings this listBox1 GetItemValue this listBox1 Items 2      Since we created the GetItemValue method as an extension method  when you want to use the method  don t forget to include the namespace which you put the class in   This method is applicable on ComboBox and CheckedListBox too

User · Answer

If you are working on a windows forms project you can try the following   Add items to the ListBox as KeyValuePair objects   listBox Items Add new KeyValuePair key  value     Then you will be able to retrieve them the following way   KeyValuePair keyValuePair   listBox Items index   var value   keyValuePair Value

User · Answer

This works for me   ListBox x   new ListBox    x Items Add new ListItem  Hello    1     x Items Add new ListItem  Bye    2      Console Write x Items 0  Value

User · Answer

I m using a BindingSource with a SqlDataReader behind it and none of the above works for me   Question for Microsoft   Why does this work       lst SelectedValue   But this doesn t        lst Items 80  Value   I find I have to go back to to the BindingSource object  cast it as a System Data Common DbDataRecord  and then refer to its column name          System Data Common DbDataRecord  bsBlocks 80    BlockKey     Now that s just ridiculous

User · Answer

Suppose you want the value of the first item   ListBox list   new ListBox    Console Write list Items 0  Value

User · Answer

simply try this  listBox  is your list and  yu  is a veriable to which the value on index 0 will be assigned  string yu   listBox1 Items 0  ToString    MessageBox Show yu

[c#] Get the value for a listbox item by index

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