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ComboBox.ObjectCollection Class

.NET Framework 4

Represents the collection of items in a ComboBox.

System.Object
  System.Windows.Forms.ComboBox.ObjectCollection

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)
C#
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[ListBindableAttribute(false)]
public class ObjectCollection : IList, 
	ICollection, IEnumerable

The ComboBox.ObjectCollection type exposes the following members.

  Name Description
Public method ComboBox.ObjectCollection Initializes a new instance of System.Windows.Forms.ComboBox.ObjectCollection.
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  Name Description
Public property Count Gets the number of items in the collection.
Public property IsReadOnly Gets a value indicating whether this collection can be modified.
Public property Item Retrieves the item at the specified index within the collection.
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  Name Description
Public method Add Adds an item to the list of items for a ComboBox.
Public method AddRange Adds an array of items to the list of items for a ComboBox.
Public method Clear Removes all items from the ComboBox.
Public method Contains Determines if the specified item is located within the collection.
Public method CopyTo Copies the entire collection into an existing array of objects at a specified location within the array.
Public method Equals(Object) Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected method Finalize Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method GetEnumerator Returns an enumerator that can be used to iterate through the item collection.
Public method GetHashCode Serves as a hash function for a particular type. (Inherited from Object.)
Public method GetType Gets the Type of the current instance. (Inherited from Object.)
Public method IndexOf Retrieves the index within the collection of the specified item.
Public method Insert Inserts an item into the collection at the specified index.
Protected method MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public method Remove Removes the specified item from the ComboBox.
Public method RemoveAt Removes an item from the ComboBox at the specified index.
Public method ToString Returns a string that represents the current object. (Inherited from Object.)
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  Name Description
Public Extension Method AsParallel Enables parallelization of a query. (Defined by ParallelEnumerable.)
Public Extension Method AsQueryable Converts an IEnumerable to an IQueryable. (Defined by Queryable.)
Public Extension Method Cast<TResult> Casts the elements of an IEnumerable to the specified type. (Defined by Enumerable.)
Public Extension Method OfType<TResult> Filters the elements of an IEnumerable based on a specified type. (Defined by Enumerable.)
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  Name Description
Explicit interface implemetation Private method ICollection.CopyTo Infrastructure. For a description of this member, see ICollection.CopyTo.
Explicit interface implemetation Private property ICollection.IsSynchronized Infrastructure. For a description of this member, see ICollection.IsSynchronized.
Explicit interface implemetation Private property ICollection.SyncRoot Infrastructure. For a description of this member, see ICollection.SyncRoot.
Explicit interface implemetation Private method IList.Add Infrastructure. For a description of this member, see IList.Add.
Explicit interface implemetation Private property IList.IsFixedSize Infrastructure. For a description of this member, see IList.IsFixedSize.
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The System.Windows.Forms.ComboBox.ObjectCollection class encapsulates the items in the ComboBox. The object collection of a combo box can be used to manage many types of objects, including strings, images, and custom business objects.

You can add items to the collection in several ways. The Add method adds one object to the collection. To add a number of objects to the collection, it is best to create an array of items and assign with the AddRange method. To insert an object at a specific location within the collection, you can use the Insert method. To remove items at a known index in the collection you can use either the Remove method or the RemoveAt method. The Clear method removes all the items from the collection.

In addition to methods and properties for adding and removing items, the System.Windows.Forms.ComboBox.ObjectCollection also provides methods to find items within the collection. The Contains method enables you to determine if an object is a member of the collection. Once you know that the item is located within the collection, you can use the IndexOf method to determine where the item is located within the collection.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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