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Contract::ForAll Method (Int32, Int32, Predicate<Int32>)

Determines whether a particular condition is valid for all integers in a specified range.

Namespace:  System.Diagnostics.Contracts
Assemblies:   mscorlib (in mscorlib.dll)
  System.Diagnostics.Contracts (in System.Diagnostics.Contracts.dll)

static bool ForAll(
	int fromInclusive, 
	int toExclusive, 
	Predicate<int>^ predicate


Type: System::Int32

The first integer to pass to predicate.

Type: System::Int32

One more than the last integer to pass to predicate.

Type: System::Predicate<Int32>

The function to evaluate for the existence of the integers in the specified range.

Return Value

Type: System::Boolean
true if predicate returns true for all integers starting from fromInclusive to toExclusive - 1.


predicate is nullptr.


toExclusive is less than fromInclusive.

The toExclusive parameter is one more than the last integer to facilitate using the length of a range of integers starting at 0. For example, it would be set to 5 for integers 0 through 4.

The following example demonstrates how to use the ForAll method to determine whether an array has a null element.

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

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, 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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