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CheckedListBox.ObjectCollection Class

Represents the collection of items in a CheckedListBox.

System.Object
  System.Windows.Forms.ListBox.ObjectCollection
    System.Windows.Forms.CheckedListBox.ObjectCollection

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public class ObjectCollection : ListBox.ObjectCollection

The CheckedListBox.ObjectCollection type exposes the following members.

  NameDescription
Public methodCheckedListBox.ObjectCollectionInitializes a new instance of the System.Windows.Forms.CheckedListBox.ObjectCollection class.
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  NameDescription
Public propertyCountGets the number of items in the collection. (Inherited from ListBox.ObjectCollection.)
Public propertyIsReadOnlyGets a value indicating whether the collection is read-only. (Inherited from ListBox.ObjectCollection.)
Public propertyItemGets or sets the item at the specified index within the collection. (Inherited from ListBox.ObjectCollection.)
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  NameDescription
Public methodAdd(Object)Adds an item to the list of items for a ListBox. (Inherited from ListBox.ObjectCollection.)
Public methodAdd(Object, Boolean)Adds an item to the list of items for a CheckedListBox, specifying the object to add and whether it is checked.
Public methodAdd(Object, CheckState)Adds an item to the list of items for a CheckedListBox, specifying the object to add and the initial checked value.
Public methodAddRange(ListBox.ObjectCollection)Adds the items of an existing ListBox.ObjectCollection to the list of items in a ListBox. (Inherited from ListBox.ObjectCollection.)
Public methodAddRange(Object[])Adds an array of items to the list of items for a ListBox. (Inherited from ListBox.ObjectCollection.)
Public methodClearRemoves all items from the collection. (Inherited from ListBox.ObjectCollection.)
Public methodContainsDetermines whether the specified item is located within the collection. (Inherited from ListBox.ObjectCollection.)
Public methodCopyToCopies the entire collection into an existing array of objects at a specified location within the array. (Inherited from ListBox.ObjectCollection.)
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetEnumeratorReturns an enumerator to use to iterate through the item collection. (Inherited from ListBox.ObjectCollection.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIndexOfReturns the index within the collection of the specified item. (Inherited from ListBox.ObjectCollection.)
Public methodInsertInserts an item into the list box at the specified index. (Inherited from ListBox.ObjectCollection.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodRemoveRemoves the specified object from the collection. (Inherited from ListBox.ObjectCollection.)
Public methodRemoveAtInfrastructure. Removes the item at the specified index within the collection. (Inherited from ListBox.ObjectCollection.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Explicit interface implemetationPrivate methodICollection.CopyToInfrastructure. Copies the elements of the collection to an array, starting at a particular array index. (Inherited from ListBox.ObjectCollection.)
Explicit interface implemetationPrivate propertyICollection.IsSynchronizedInfrastructure. For a description of this member, see ICollection.IsSynchronized. (Inherited from ListBox.ObjectCollection.)
Explicit interface implemetationPrivate propertyICollection.SyncRootInfrastructure. For a description of this member, see ICollection.SyncRoot. (Inherited from ListBox.ObjectCollection.)
Explicit interface implemetationPrivate methodIList.AddInfrastructure. Adds an object to the ListBox class. (Inherited from ListBox.ObjectCollection.)
Explicit interface implemetationPrivate propertyIList.IsFixedSizeInfrastructure. For a description of this member, see IList.IsFixedSize. (Inherited from ListBox.ObjectCollection.)
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The collection is accessed from the parent control, CheckedListBox, by the Items property. To create a collection of objects to display in the CheckedListBox control, you can add or remove the items individually by using the Add and Remove methods.

The following example enumerates the items in the CheckedListBox and checks every other item in the list. The example demonstrates using the Items property to get the CheckedListBox.ObjectCollection to get the Count of items.

The example also demonstrates using the SetItemCheckState and SetItemChecked methods to set the check state of an item. For every other item that is to be checked, SetItemCheckState is called to set the CheckState to Indeterminate, while SetItemChecked is called on the other item to set the checked state to Checked.

private void CheckEveryOther_Click(object sender, System.EventArgs e) {
    // Cycle through every item and check every other. 

    // Set flag to true to know when this code is being executed. Used in the ItemCheck 
    // event handler.
    insideCheckEveryOther = true;

    for (int i = 0; i < checkedListBox1.Items.Count; i++) {
        // For every other item in the list, set as checked. 
        if ((i % 2) == 0) {
            // But for each other item that is to be checked, set as being in an 
            // indeterminate checked state. 
            if ((i % 4) == 0)
                checkedListBox1.SetItemCheckState(i, CheckState.Indeterminate);
            else
                checkedListBox1.SetItemChecked(i, true);
        }
    }        

    insideCheckEveryOther = false;
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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