Contract.ForAll Metoda

Definice

Obor názvů:

System.Diagnostics.Contracts

Sestavení:

System.Diagnostics.Contracts.dll

Přetížení

ForAll(Int32, Int32, Predicate<Int32>)	Určuje, zda je určitá podmínka platná pro všechna celá čísla v zadaném rozsahu.
ForAll<T>(IEnumerable<T>, Predicate<T>)	Určuje, zda všechny prvky v kolekci existují v rámci funkce.

ForAll(Int32, Int32, Predicate<Int32>)

Zdroj:

Contracts.cs

Určuje, zda je určitá podmínka platná pro všechna celá čísla v zadaném rozsahu.

public:
 static bool ForAll(int fromInclusive, int toExclusive, Predicate<int> ^ predicate);

public static bool ForAll (int fromInclusive, int toExclusive, Predicate<int> predicate);

static member ForAll : int * int * Predicate<int> -> bool

Public Shared Function ForAll (fromInclusive As Integer, toExclusive As Integer, predicate As Predicate(Of Integer)) As Boolean

Parametry

fromInclusive

Int32

První celé číslo, které se předá predicatedo .

toExclusive

Int32

Jedno více než poslední celé číslo, které se má předat do predicate.

predicate

Predicate<Int32>

Funkce, která má vyhodnotit existenci celých čísel v zadaném rozsahu.

Návraty

Boolean

true pokud predicate se vrátí true pro všechna celá čísla od fromInclusive - toExclusive 1.

Výjimky

ArgumentNullException

predicate je null.

ArgumentException

toExclusive je menší než fromInclusive.

Příklady

Následující příklad ukazuje, jak použít metodu ForAll k určení, zda pole má prvek null.

using System;
using System.Diagnostics.Contracts;
using System.Collections.Generic;
namespace AssumeEx
{
    class Program
    {
        // Start application with at least two arguments
        static void Main(string[] args)
        {
            args[1] = null;
            Contract.Requires(args != null && Contract.ForAll(0, args.Length, i => args[i] != null));
            // test the ForAll method.  This is only for purpose of demonstrating how ForAll works.
            CheckIndexes(args);
            Stack<string> numbers = new Stack<string>();
            numbers.Push("one");
            numbers.Push("two");
            numbers.Push(null);
            numbers.Push("four");
            numbers.Push("five");
            Contract.Requires(numbers != null && !Contract.ForAll(numbers, (String x) => x != null));
            // test the ForAll generic overload.  This is only for purpose of demonstrating how ForAll works.
            CheckTypeArray(numbers);
        }

        private static bool CheckIndexes(string[] args)
        {
            try
            {
                if (args != null && !Contract.ForAll(0, args.Length, i => args[i] != null))
                    throw new ArgumentException("The parameter array has a null element", "args");
                return true;
            }
            catch (ArgumentException e)
            {
                Console.WriteLine(e.Message);
                return false;
            }
        }
        private static bool CheckTypeArray(IEnumerable<String> xs)
        {
            try
            {
                if (xs != null && !Contract.ForAll(xs, (String x) => x != null))
                    throw new ArgumentException("The parameter array has a null element", "indexes");
                return true;
            }
            catch (ArgumentException e)
            {
                Console.WriteLine(e.Message);
                return false;
            }
        }
    }
}

Imports System.Diagnostics.Contracts
Imports System.Collections.Generic


Class Program

    ' Start application with at least two arguments.
    Shared Sub Main(ByVal args() As String)
        args(1) = Nothing
        Contract.Requires(Not (args Is Nothing) AndAlso Contract.ForAll(args, Function(s) s Is Nothing))
        ' test the ForAll method.  This is only for purpose of demonstrating how ForAll works.
        CheckIndexes(args)
        Dim numbers As New Stack(Of String)
        numbers.Push("one")
        numbers.Push("two")
        numbers.Push("three")
        numbers.Push("four")
        numbers.Push("five")

        Contract.Requires(Not (numbers Is Nothing) AndAlso Not Contract.ForAll(numbers, Function(s) s Is Nothing))
        ' test the ForAll generic overload. This is only for purpose of demonstrating how ForAll works.
        CheckTypeArray(numbers)

    End Sub


    Private Shared Function CheckIndexes(ByVal args() As String) As Boolean
        Try
            If Not (args Is Nothing) AndAlso Not Contract.ForAll(0, args.Length, Function(i) args(i) Is Nothing) Then
                Throw New ArgumentException("The parameter array has a null element", "args")
            End If
            Return True
        Catch e As ArgumentException
            Console.WriteLine(e.Message)
            Return False
        End Try

    End Function 'CheckIndexes

    Private Shared Function CheckTypeArray(ByVal xs As Stack(Of String)) As Boolean

        Try
            If Not (xs Is Nothing) AndAlso Not Contract.ForAll(xs, Function(s) s Is Nothing) Then

                Throw New ArgumentException("The parameter array has a null element", "Stack")
            End If
            Return True

        Catch e As ArgumentException
            Console.WriteLine(e.Message)
            Return False
        End Try

    End Function 'CheckTypeArray
End Class

Poznámky

Parametr toExclusive je o jedno více než poslední celé číslo, aby se usnadnilo použití délky rozsahu celých čísel začínajících na 0. Například pro celá čísla 0 až 4 bude nastavená na hodnotu 5.

Viz také

• TrueForAll(Predicate<T>)

ForAll<T>(IEnumerable<T>, Predicate<T>)

Zdroj:

Contracts.cs

Určuje, zda všechny prvky v kolekci existují v rámci funkce.

public:
generic <typename T>
 static bool ForAll(System::Collections::Generic::IEnumerable<T> ^ collection, Predicate<T> ^ predicate);

public static bool ForAll<T> (System.Collections.Generic.IEnumerable<T> collection, Predicate<T> predicate);

static member ForAll : seq<'T> * Predicate<'T> -> bool

Public Shared Function ForAll(Of T) (collection As IEnumerable(Of T), predicate As Predicate(Of T)) As Boolean

Parametry typu

T

Typ obsažený v collectionsouboru .

Parametry

collection

IEnumerable<T>

Kolekce, ze které se budou kreslit prvky typu T , aby se předaly do predicate.

predicate

Predicate<T>

Funkce, která se má vyhodnotit z hlediska existence všech prvků v collectionsouboru .

Návraty

Boolean

true if a only if predicate vrátí true pro všechny prvky typu T v collection.

Výjimky

ArgumentNullException

collection nebo predicate je null.

Příklady

Následující příklad ukazuje, jak použít metodu ForAll k určení, zda má kolekce element null.

using System;
using System.Diagnostics.Contracts;
using System.Collections.Generic;
namespace AssumeEx
{
    class Program
    {
        // Start application with at least two arguments
        static void Main(string[] args)
        {
            args[1] = null;
            Contract.Requires(args != null && Contract.ForAll(0, args.Length, i => args[i] != null));
            // test the ForAll method.  This is only for purpose of demonstrating how ForAll works.
            CheckIndexes(args);
            Stack<string> numbers = new Stack<string>();
            numbers.Push("one");
            numbers.Push("two");
            numbers.Push(null);
            numbers.Push("four");
            numbers.Push("five");
            Contract.Requires(numbers != null && !Contract.ForAll(numbers, (String x) => x != null));
            // test the ForAll generic overload.  This is only for purpose of demonstrating how ForAll works.
            CheckTypeArray(numbers);
        }

        private static bool CheckIndexes(string[] args)
        {
            try
            {
                if (args != null && !Contract.ForAll(0, args.Length, i => args[i] != null))
                    throw new ArgumentException("The parameter array has a null element", "args");
                return true;
            }
            catch (ArgumentException e)
            {
                Console.WriteLine(e.Message);
                return false;
            }
        }
        private static bool CheckTypeArray(IEnumerable<String> xs)
        {
            try
            {
                if (xs != null && !Contract.ForAll(xs, (String x) => x != null))
                    throw new ArgumentException("The parameter array has a null element", "indexes");
                return true;
            }
            catch (ArgumentException e)
            {
                Console.WriteLine(e.Message);
                return false;
            }
        }
    }
}

Imports System.Diagnostics.Contracts
Imports System.Collections.Generic


Class Program

    ' Start application with at least two arguments.
    Shared Sub Main(ByVal args() As String)
        args(1) = Nothing
        Contract.Requires(Not (args Is Nothing) AndAlso Contract.ForAll(args, Function(s) s Is Nothing))
        ' test the ForAll method.  This is only for purpose of demonstrating how ForAll works.
        CheckIndexes(args)
        Dim numbers As New Stack(Of String)
        numbers.Push("one")
        numbers.Push("two")
        numbers.Push("three")
        numbers.Push("four")
        numbers.Push("five")

        Contract.Requires(Not (numbers Is Nothing) AndAlso Not Contract.ForAll(numbers, Function(s) s Is Nothing))
        ' test the ForAll generic overload. This is only for purpose of demonstrating how ForAll works.
        CheckTypeArray(numbers)

    End Sub


    Private Shared Function CheckIndexes(ByVal args() As String) As Boolean
        Try
            If Not (args Is Nothing) AndAlso Not Contract.ForAll(0, args.Length, Function(i) args(i) Is Nothing) Then
                Throw New ArgumentException("The parameter array has a null element", "args")
            End If
            Return True
        Catch e As ArgumentException
            Console.WriteLine(e.Message)
            Return False
        End Try

    End Function 'CheckIndexes

    Private Shared Function CheckTypeArray(ByVal xs As Stack(Of String)) As Boolean

        Try
            If Not (xs Is Nothing) AndAlso Not Contract.ForAll(xs, Function(s) s Is Nothing) Then

                Throw New ArgumentException("The parameter array has a null element", "Stack")
            End If
            Return True

        Catch e As ArgumentException
            Console.WriteLine(e.Message)
            Return False
        End Try

    End Function 'CheckTypeArray
End Class

Viz také

• TrueForAll(Predicate<T>)