À l'aide de la source de données avec CheckBoxList

Comme un autre, j'ai mis en place le CheckedListBox.Le Format de l'événement pour mettre à jour automatiquement l'affichage de la CheckedState avec les données; et la mise en œuvre de la CheckedListBox.ItemCheck événement pour mettre à jour automatiquement les données avec le CheckedState.

private DataTable myDataTable = null;
private BindingSource myBindingSource = new BindingSource();
//Column Name Constants
private const string C_ITEM_INDEX = "Item_Index";      //CheckedListBox Item's Index
private const string C_ITEM_TEXT = "Item_Text";        //Item's Text
private const string C_ITEM_CHECKED = "Item_Checked";  //Item's Checked State
private const string C_DATA_KEY = "Data_Key";          //Arbitrary Key Value for Relating Item to Other Data
private void Startup()
{
//Create DataTable 
//This DataTable has 4 Columns described by the constants above
myDataTable = new DataTable();
myDataTable.Columns.Add(new DataColumn(C_ITEM_INDEX, typeof(Int32)));
myDataTable.Columns[C_ITEM_INDEX].DefaultValue = 0;
myDataTable.Columns.Add(new DataColumn(C_ITEM_TEXT, typeof(string)));
myDataTable.Columns[C_ITEM_TEXT].DefaultValue = "";
//I personally like Integer 1=true, 0=false values.  typeof(bool) will also work.
myDataTable.Columns.Add(new DataColumn(C_ITEM_CHECKED, typeof(Int32)));
myDataTable.Columns[C_ITEM_CHECKED].DefaultValue = 0;
//Other columns can be included in the DataTable
myDataTable.Columns.Add(new DataColumn(C_DATA_KEY, typeof(Int32)));
myDataTable.Columns[C_DATA_KEY].DefaultValue = 0;     
myDataTable.AcceptChanges();
//Bind the DataTable's DefaultView to the CheckedListBox
myBindingSource.DataSource = myDataTable.DefaultView;
this.myCheckedListBox.DataSource = myBindingSource;
//Set the DisplayMember to the DataColumn you want displayed as the CheckedListBox Items's Text
this.myCheckedListBox.DisplayMember = C_ITEM_TEXT;
//Set the ValueMember to the Data.  Note:  The ValueMember is not displayed and is Not the CheckBox value.
this.myCheckedListBox.ValueMember = C_DATA_KEY;
//Hookup Event Handler for the CheckedListBox.Format Event.  
///* The Format event enables us to just in time update the CheckBoxes with the values in the DataTable
this.myCheckedListBox.Format += myCheckedListBox_Format;
//Hookup Event Handler for the CheckedListBox.ItemCheck Event.
///* The ItemCheck event enables us to just in time update the DataTable with the values from the Item CheckBoxes
this.myCheckedListBox.ItemCheck += myCheckedListBox_ItemCheck;
}
void myCheckedListBox_Format(object sender, ListControlConvertEventArgs e)
{
///* The Format event enables us to just in time update the CheckBoxes with the values in the DataTable
//Retrieve the Index of the Item in the CheckedListBox by finding the DataRowView in the BindingSource
//  Note:  Use a column with unique values for the BindingSource.Find() function
int listindex = myBindingSource.Find(C_ITEM_INDEX, ((DataRowView)e.ListItem)[C_ITEM_INDEX]);
//The argument, e.ListItem, is the current DataRowView in the DataTable's DefaultView
//Check to see if the checkbox value is different from the data
if (((CheckedListBox)sender).GetItemChecked(listindex) !=  Convert.ToBoolean(((DataRowView)e.ListItem)[C_ITEM_CHECKED]))
{
//Set the CheckList Item's CheckState to match the data
((CheckedListBox)sender).SetItemChecked(listindex, Convert.ToBoolean(((DataRowView)e.ListItem)[C_ITEM_CHECKED]));
}
}
void myCheckedListBox_ItemCheck(object sender, ItemCheckEventArgs e)
{
///* The ItemCheck event enables us to just in time update the DataTable with the values from the Item CheckBoxes
//Update the data with the new CheckState value.  
if (e.NewValue == CheckState.Checked)
{
myDataTable.DefaultView[e.Index][C_ITEM_CHECKED] = 1;
}
else
{
myDataTable.DefaultView[e.Index][C_ITEM_CHECKED] = 0;
}
//Update other data values too if you need to.
}

OriginalL'auteur gridtrak