Queryable.Min Method

Definition

Overloads

Min<TSource,TResult>(IQueryable<TSource>, Expression<Func<TSource,TResult>>)

Invoca uma função de projeção em cada elemento de um IQueryable<T> genérico e retorna o valor resultante mínimo.Invokes a projection function on each element of a generic IQueryable<T> and returns the minimum resulting value.

Min<TSource>(IQueryable<TSource>)

Retorna o valor mínimo de um IQueryable<T> genérico.Returns the minimum value of a generic IQueryable<T>.

Min<TSource,TResult>(IQueryable<TSource>, Expression<Func<TSource,TResult>>)

Invoca uma função de projeção em cada elemento de um IQueryable<T> genérico e retorna o valor resultante mínimo.Invokes a projection function on each element of a generic IQueryable<T> and returns the minimum resulting value.

public:
generic <typename TSource, typename TResult>
[System::Runtime::CompilerServices::Extension]
 static TResult Min(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, TResult> ^> ^ selector);
public static TResult Min<TSource,TResult> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,TResult>> selector);
static member Min : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, 'Result>> -> 'Result
<Extension()>
Public Function Min(Of TSource, TResult) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, TResult))) As TResult

Type Parameters

TSource

O tipo dos elementos de source.The type of the elements of source.

TResult

O tipo do valor retornado pela função representada por selector.The type of the value returned by the function represented by selector.

Parameters

source
IQueryable<TSource>

Uma sequência de valores para determinar o mínimo.A sequence of values to determine the minimum of.

selector
Expression<Func<TSource,TResult>>

Uma função de projeção a ser aplicada a cada elemento.A projection function to apply to each element.

Returns

TResult

O valor mínimo na sequência.The minimum value in the sequence.

Exceptions

source ou selector é null.source or selector is null.

Examples

O exemplo de código a seguir demonstra como usar Min<TSource,TResult>(IQueryable<TSource>, Expression<Func<TSource,TResult>>) para determinar o valor mínimo em uma sequência de valores projetados.The following code example demonstrates how to use Min<TSource,TResult>(IQueryable<TSource>, Expression<Func<TSource,TResult>>) to determine the minimum value in a sequence of projected values.

class Pet
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public static void MinEx2()
{
    Pet[] pets = { new Pet { Name="Barley", Age=8 },
                   new Pet { Name="Boots", Age=4 },
                   new Pet { Name="Whiskers", Age=1 } };

    // Get the Pet object that has the smallest Age value.
    int min = pets.AsQueryable().Min(pet => pet.Age);

    Console.WriteLine("The youngest animal is age {0}.", min);
}

/*
    This code produces the following output:

    The youngest animal is age 1.
*/

Structure Pet
    Public Name As String
    Public Age As Integer
End Structure

Shared Sub MinEx2()
    Dim pets() As Pet = {New Pet With {.Name = "Barley", .Age = 8}, _
                   New Pet With {.Name = "Boots", .Age = 4}, _
                   New Pet With {.Name = "Whiskers", .Age = 1}}

    ' Get the Pet object that has the smallest Age value.
    Dim min As Integer = pets.AsQueryable().Min(Function(pet) pet.Age)

    MsgBox(String.Format("The youngest animal is age {0}.", min))
End Sub

'This code produces the following output:

'The youngest animal is age 1.  

Remarks

Esse método tem pelo menos um parâmetro do tipo Expression<TDelegate> cujo argumento de tipo é um dos tipos de Func<T,TResult>.This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. Para esses parâmetros, você pode passar uma expressão lambda e ela será compilada para um Expression<TDelegate>.For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

O método Min<TSource,TResult>(IQueryable<TSource>, Expression<Func<TSource,TResult>>) gera um MethodCallExpression que representa a chamada Min<TSource,TResult>(IQueryable<TSource>, Expression<Func<TSource,TResult>>) si mesmo como um método genérico construído.The Min<TSource,TResult>(IQueryable<TSource>, Expression<Func<TSource,TResult>>) method generates a MethodCallExpression that represents calling Min<TSource,TResult>(IQueryable<TSource>, Expression<Func<TSource,TResult>>) itself as a constructed generic method. Em seguida, ele passa o MethodCallExpression para o método Execute<TResult>(Expression) do IQueryProvider representado pela propriedade Provider do parâmetro source.It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

O comportamento da consulta que ocorre como resultado da execução de uma árvore de expressão que representa a chamada de Min<TSource,TResult>(IQueryable<TSource>, Expression<Func<TSource,TResult>>) depende da implementação do tipo do parâmetro source.The query behavior that occurs as a result of executing an expression tree that represents calling Min<TSource,TResult>(IQueryable<TSource>, Expression<Func<TSource,TResult>>) depends on the implementation of the type of the source parameter. O comportamento esperado é que ele invoca selector em cada elemento em source e retorna o valor mínimo.The expected behavior is that it invokes selector on each element in source and returns the minimum value.

Min<TSource>(IQueryable<TSource>)

Retorna o valor mínimo de um IQueryable<T> genérico.Returns the minimum value of a generic IQueryable<T>.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static TSource Min(System::Linq::IQueryable<TSource> ^ source);
public static TSource Min<TSource> (this System.Linq.IQueryable<TSource> source);
static member Min : System.Linq.IQueryable<'Source> -> 'Source
<Extension()>
Public Function Min(Of TSource) (source As IQueryable(Of TSource)) As TSource

Type Parameters

TSource

O tipo dos elementos de source.The type of the elements of source.

Parameters

source
IQueryable<TSource>

Uma sequência de valores para determinar o mínimo.A sequence of values to determine the minimum of.

Returns

TSource

O valor mínimo na sequência.The minimum value in the sequence.

Exceptions

source é null.source is null.

Examples

O exemplo de código a seguir demonstra como usar Min<TSource>(IQueryable<TSource>) para determinar o valor mínimo em uma sequência.The following code example demonstrates how to use Min<TSource>(IQueryable<TSource>) to determine the minimum value in a sequence.

double[] doubles = { 1.5E+104, 9E+103, -2E+103 };

double min = doubles.AsQueryable().Min();

Console.WriteLine("The smallest number is {0}.", min);

/*
    This code produces the following output:

    The smallest number is -2E+103.
*/

Dim doubles() As Double = {1.5E+104, 9.0E+103, -2.0E+103}

Dim min As Double = doubles.AsQueryable().Min()

MsgBox(String.Format("The smallest number is {0}.", min))

'This code produces the following output:

'The smallest number is -2E+103.

Remarks

O método Min<TSource>(IQueryable<TSource>) gera um MethodCallExpression que representa a chamada Min<TSource>(IQueryable<TSource>) si mesmo como um método genérico construído.The Min<TSource>(IQueryable<TSource>) method generates a MethodCallExpression that represents calling Min<TSource>(IQueryable<TSource>) itself as a constructed generic method. Em seguida, ele passa o MethodCallExpression para o método Execute<TResult>(Expression) do IQueryProvider representado pela propriedade Provider do parâmetro source.It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

O comportamento da consulta que ocorre como resultado da execução de uma árvore de expressão que representa a chamada de Min<TSource>(IQueryable<TSource>) depende da implementação do tipo do parâmetro source.The query behavior that occurs as a result of executing an expression tree that represents calling Min<TSource>(IQueryable<TSource>) depends on the implementation of the type of the source parameter. O comportamento esperado é que ele retorna o valor mínimo em source.The expected behavior is that it returns the minimum value in source.

Applies to