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ThreadPriorityLevel Enumeration

Specifies the priority level of a thread.

Namespace:  System.Diagnostics
Assembly:  System (in System.dll)

public enum ThreadPriorityLevel

Member nameDescription
AboveNormalSpecifies one step above the normal priority for the associated ProcessPriorityClass.
BelowNormalSpecifies one step below the normal priority for the associated ProcessPriorityClass.
HighestSpecifies highest priority. This is two steps above the normal priority for the associated ProcessPriorityClass.
IdleSpecifies idle priority. This is the lowest possible priority value of all threads, independent of the value of the associated ProcessPriorityClass.
LowestSpecifies lowest priority. This is two steps below the normal priority for the associated ProcessPriorityClass.
NormalSpecifies normal priority for the associated ProcessPriorityClass.
TimeCriticalSpecifies time-critical priority. This is the highest priority of all threads, independent of the value of the associated ProcessPriorityClass.

Every thread has a base-priority level determined by the thread's priority value and the priority class of its process. The operating system uses the base-priority level of all executable threads to determine which thread gets the next slice of processor time.

The priority level is not an absolute value, but instead is a range of priority values. The operating system computes the priority by using the process priority class to determine where, in the range specified by the PriorityLevel property, to set the thread's priority.

.NET Framework

Supported in: 4.5.3, 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.

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