Assembly: System (in System.dll)
Creates an empty case-sensitive.
Creates an emptywith the specified case sensitivity.
Creates a case-sensitivewith the specified initial size.
Creates awith the specified initial size and case sensitivity.
Gets the number of key/value pairs contained in the.
Gets a value indicating whether thehas a fixed size.
Gets a value indicating whether theis read-only.
Gets a value indicating whether theis synchronized (thread safe).
Gets or sets the value associated with the specified key.
Gets an ICollection containing the keys in the .
Gets an object that can be used to synchronize access to the.
Gets an ICollection containing the values in the .
Adds an entry with the specified key and value into the.
Removes all entries from the.
Determines whether thecontains a specific key.
Copies the Array instance at the specified index.entries to a one-dimensional
Determines whether the specified object is equal to the current object.(Inherited from Object.)
Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)
Returns an IDictionaryEnumerator that iterates through the .
Serves as the default hash function. (Inherited from Object.)
Removes the entry with the specified key from the.
Returns a string that represents the current object.(Inherited from Object.)
Overloaded. Enables parallelization of a query.(Defined by ParallelEnumerable.)
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) returns an object of the type of the elements in the collection. Since each element of the DictionaryEntry. For example: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
The foreach statement is a wrapper around the enumerator, which only allows reading from, not writing to, the collection.
Available since 10
Available since 1.1
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 SyncRoot property., but derived classes can create their own synchronized versions of the using the
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.