ParallelHelperBeginForT(T, Int32, Int32, AsyncConfig, ActionInt32) Method

public static IAsyncResult BeginFor<T>(
	T operation,
	int fromInclusive,
	int toExclusive,
	AsyncConfig? asyncConfig,
	Action<int> body
)

Public Shared Function BeginFor(Of T) ( 
	operation As T,
	fromInclusive As Integer,
	toExclusive As Integer,
	asyncConfig As AsyncConfig,
	body As Action(Of Integer)
) As IAsyncResult

public:
generic<typename T>
static IAsyncResult^ BeginFor(
	T operation, 
	int fromInclusive, 
	int toExclusive, 
	AsyncConfig^ asyncConfig, 
	Action<int>^ body
)

static member BeginFor : 
        operation : 'T * 
        fromInclusive : int * 
        toExclusive : int * 
        asyncConfig : AsyncConfig * 
        body : Action<int> -> IAsyncResult 

Parameters

operation  T

The operation to be reported when Progress is set in asyncConfig. Progress is reported only if this parameter is not .

fromInclusive  Int32

The start index, inclusive.

toExclusive  Int32

The end index, exclusive.

asyncConfig  AsyncConfig

An optional configuration to adjust parallelization, cancellation, completion callback or reporting progress.

body  ActionInt32

The delegate that is invoked once per iteration.

Type Parameters

T

The type of the operation parameter.

Return Value

In .NET Framework 4.0 and above you can use also the ForAsyncT(T, Int32, Int32, TaskConfig, ActionInt32) method.

To get the result or the exception that occurred during the operation you have to call the EndFor method.

If fromInclusive is greater than or equal to toExclusive, then the operation completes synchronously without performing any iterations.

If operation is not , Progress is set in asyncConfig and there is at least one iteration, then the IAsyncProgress.New method will be called before the first iteration passing the specified operation to the operationType parameter. It will be followed by as many IAsyncProgress.Increment calls as many iterations were completed successfully.

This method is not a blocking call even if the MaxDegreeOfParallelism property of the asyncConfig parameter is 1.

Reference