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HybridDictionary Class

Implements IDictionary by using a ListDictionary while the collection is small, and then switching to a Hashtable when the collection gets large.

System.Object
  System.Collections.Specialized.HybridDictionary
    System.Web.Mobile.CookielessData

Namespace:  System.Collections.Specialized
Assembly:  System (in System.dll)

[<SerializableAttribute>]
type HybridDictionary =  
    class
        interface IDictionary
        interface ICollection
        interface IEnumerable
    end

The HybridDictionary type exposes the following members.

  NameDescription
Public methodSupported by the XNA FrameworkHybridDictionary()Creates an empty case-sensitive HybridDictionary.
Public methodSupported by the XNA FrameworkHybridDictionary(Boolean)Creates an empty HybridDictionary with the specified case sensitivity.
Public methodSupported by the XNA FrameworkHybridDictionary(Int32)Creates a case-sensitive HybridDictionary with the specified initial size.
Public methodSupported by the XNA FrameworkHybridDictionary(Int32, Boolean)Creates a HybridDictionary with the specified initial size and case sensitivity.
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  NameDescription
Public propertySupported by the XNA FrameworkCountGets the number of key/value pairs contained in the HybridDictionary.
Public propertySupported by the XNA FrameworkIsFixedSizeGets a value indicating whether the HybridDictionary has a fixed size.
Public propertySupported by the XNA FrameworkIsReadOnlyGets a value indicating whether the HybridDictionary is read-only.
Public propertySupported by the XNA FrameworkIsSynchronizedGets a value indicating whether the HybridDictionary is synchronized (thread safe).
Public propertySupported by the XNA FrameworkItemGets or sets the value associated with the specified key.
Public propertySupported by the XNA FrameworkKeysGets an ICollection containing the keys in the HybridDictionary.
Public propertySupported by the XNA FrameworkSyncRootGets an object that can be used to synchronize access to the HybridDictionary.
Public propertySupported by the XNA FrameworkValuesGets an ICollection containing the values in the HybridDictionary.
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  NameDescription
Public methodSupported by the XNA FrameworkAddAdds an entry with the specified key and value into the HybridDictionary.
Public methodSupported by the XNA FrameworkClearRemoves all entries from the HybridDictionary.
Public methodSupported by the XNA FrameworkContainsDetermines whether the HybridDictionary contains a specific key.
Public methodSupported by the XNA FrameworkCopyToCopies the HybridDictionary entries to a one-dimensional Array instance at the specified index.
Public methodSupported by the XNA FrameworkEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodSupported by the XNA FrameworkFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by the XNA FrameworkGetEnumeratorReturns an IDictionaryEnumerator that iterates through the HybridDictionary.
Public methodSupported by the XNA FrameworkGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodSupported by the XNA FrameworkGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodSupported by the XNA FrameworkMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by the XNA FrameworkRemoveRemoves the entry with the specified key from the HybridDictionary.
Public methodSupported by the XNA FrameworkToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Public Extension MethodAsParallelEnables parallelization of a query. (Defined by ParallelEnumerable.)
Public Extension MethodAsQueryableConverts an IEnumerable to an IQueryable. (Defined by Queryable.)
Public Extension MethodSupported by the XNA FrameworkCast(TResult)Casts the elements of an IEnumerable to the specified type. (Defined by Enumerable.)
Public Extension MethodSupported by the XNA FrameworkOfType(TResult)Filters the elements of an IEnumerable based on a specified type. (Defined by Enumerable.)
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  NameDescription
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIEnumerable.GetEnumeratorReturns an IEnumerator that iterates through the HybridDictionary.
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This class is recommended for cases where the number of elements in a dictionary is unknown. It takes advantage of the improved performance of a ListDictionary with small collections, and offers the flexibility of switching to a Hashtable which handles larger collections better than ListDictionary.

If the initial size of the collection is greater than the optimal size for a ListDictionary, the collection is stored in a Hashtable to avoid the overhead of copying elements from the ListDictionary to a Hashtable.

The constructor accepts a Boolean parameter that allows the user to specify whether the collection ignores the case when comparing strings. If the collection is case-sensitive, it uses the key's implementations of Object.GetHashCode and Object.Equals. If the collection is case-insensitive, it performs a simple ordinal case-insensitive comparison, which obeys the casing rules of the invariant culture only. By default, the collection is case-sensitive. For more information on the invariant culture, see System.Globalization.CultureInfo.

A key cannot be null, but a value can.

The foreach statement of the C# language (For Each in Visual Basic) requires the type of each element in the collection. Since each element of the HybridDictionary is a key/value pair, the element type is not the type of the key or the type of the value. Instead, the element type is DictionaryEntry. For example:

No code example is currently available or this language may not be supported.

The foreach statement is a wrapper around the enumerator, which only allows reading from, not writing to, the collection.

The following code example demonstrates several of the properties and methods of HybridDictionary.

No code example is currently available or this language may not be supported.

.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.

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

This implementation does not provide a synchronized (thread safe) wrapper for a HybridDictionary, but derived classes can create their own synchronized versions of the HybridDictionary using the SyncRoot property.

Enumerating through a collection is intrinsically not a thread-safe procedure. Even when a collection is synchronized, other threads can still modify the collection, which causes the enumerator to throw an exception. To guarantee thread safety during enumeration, you can either lock the collection during the entire enumeration or catch the exceptions resulting from changes made by other threads.

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