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ApplicationTrustEnumerator Class

Represents the enumerator for ApplicationTrust objects in the ApplicationTrustCollection collection.

System.Object
  System.Security.Policy.ApplicationTrustEnumerator

Namespace:  System.Security.Policy
Assembly:  mscorlib (in mscorlib.dll)

[ComVisibleAttribute(true)]
public sealed class ApplicationTrustEnumerator : IEnumerator

The ApplicationTrustEnumerator type exposes the following members.

  NameDescription
Public propertyCurrentGets the current ApplicationTrust object in the ApplicationTrustCollection collection.
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  NameDescription
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodMoveNextMoves to the next element in the ApplicationTrustCollection collection.
Public methodResetResets the enumerator to the beginning of the ApplicationTrustCollection collection.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Explicit interface implemetationPrivate propertyIEnumerator.CurrentInfrastructure. Gets the current Object in the ApplicationTrustCollection collection.
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Enumerators only allow reading the data in the collection. Enumerators cannot be used to modify the underlying collection.

Initially, the enumerator is positioned before the first element in the collection. The Reset method also brings the enumerator back to this position. At this position, calling the Current property throws an exception. Therefore, you must call the MoveNext method to advance the enumerator to the first element of the collection before reading the value of the Current property.

Current returns the same object until either MoveNext or Reset is called. MoveNext sets Current to the next element.

After the end of the collection is passed, the enumerator is positioned after the last element in the collection, and calling MoveNext returns false. If the last call to MoveNext returned false, calling Current throws an exception. To reset Current to the first element of the collection, call Reset followed by a call to MoveNext.

An enumerator remains valid as long as the collection remains unchanged. If changes are made to the collection, such as adding, modifying, or deleting elements, the enumerator is irrecoverably invalidated and the next call to MoveNext or Reset throws an InvalidOperationException exception. If the collection is modified between calling MoveNext and Current, Current returns the element to which it is currently set, even if the enumerator is already invalidated.

The enumerator does not have exclusive access to the collection; therefore, 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.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.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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