Contoh Sintaks Ekspresi Kueri: Pemesanan

Contoh dalam topik ini menunjukkan cara menggunakan metode OrderBy dan OrderByDescending untuk membuat kueri Model Penjualan AdventureWorks menggunakan sintaks ekspresi kueri. Model Penjualan AdventureWorks yang digunakan dalam contoh ini dibuat dari tabel Kontak, Alamat, Produk, SalesOrderHeader, dan SalesOrderDetail dalam database sampel AdventureWorks.

Contoh dalam topik ini menggunakan pernyataan using/Imports berikut:

using System;
using System.Data;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Objects;
using System.Globalization;
using System.Data.EntityClient;
using System.Data.SqlClient;
using System.Data.Common;

Option Explicit On
Option Strict On
Imports System.Data.Objects
Imports System.Globalization

OrderBy

Contoh

Contoh berikut menggunakan OrderBy untuk mengembalikan daftar kontak yang diurutkan menurut nama belakang.

using (AdventureWorksEntities context = new AdventureWorksEntities())
{
    IQueryable<Contact> sortedNames =
        from n in context.Contacts
        orderby n.LastName
        select n;

    Console.WriteLine("The sorted list of last names:");
    foreach (Contact n in sortedNames)
    {
        Console.WriteLine(n.LastName);
    }
}

Using context As New AdventureWorksEntities
    Dim contacts As ObjectSet(Of Contact) = context.Contacts

    Dim sortedContacts = _
        From contact In contacts _
        Order By contact.LastName _
        Select contact

    Console.WriteLine("The sorted list of last names:")
    For Each n As Contact In sortedContacts
        Console.WriteLine(n.LastName)
    Next
End Using

Contoh

Contoh berikut menggunakan OrderBy untuk mengurutkan daftar kontak menurut panjang nama belakang.

using (AdventureWorksEntities context = new AdventureWorksEntities())
{
    IQueryable<Contact> sortedNames =
        from n in context.Contacts
        orderby n.LastName.Length
        select n;

    Console.WriteLine("The sorted list of last names (by length):");
    foreach (Contact n in sortedNames)
    {
        Console.WriteLine(n.LastName);
    }
}

Using context As New AdventureWorksEntities
    Dim contacts As ObjectSet(Of Contact) = context.Contacts

    Dim sortedNames = _
        From n In contacts _
        Order By n.LastName.Length _
        Select n

    Console.WriteLine("The sorted list of last names (by length):")
    For Each n As Contact In sortedNames
        Console.WriteLine(n.LastName)
    Next
End Using

OrderByDescending

Contoh

Contoh berikut menggunakan orderby… descending (Order By … Descending dalam Visual Basic), yang setara dengan metode OrderByDescending, untuk mengurutkan daftar harga dari tertinggi ke terendah.

using (AdventureWorksEntities context = new AdventureWorksEntities())
{
    IQueryable<Decimal> sortedPrices =
        from p in context.Products
        orderby p.ListPrice descending
        select p.ListPrice;

    Console.WriteLine("The list price from highest to lowest:");
    foreach (Decimal price in sortedPrices)
    {
        Console.WriteLine(price);
    }
}

Using context As New AdventureWorksEntities
    Dim products As ObjectSet(Of Product) = context.Products

    Dim sortedPrices = _
        From product In products _
        Order By product.ListPrice Descending _
        Select product.ListPrice

    Console.WriteLine("The list price from highest to lowest:")
    For Each price As Decimal In sortedPrices
        Console.WriteLine(price)
    Next
End Using

ThenBy

Contoh

Contoh berikut menggunakan OrderBy dan ThenBy untuk mengembalikan daftar kontak yang diurutkan menurut nama belakang dan kemudian menurut nama depan.

using (AdventureWorksEntities context = new AdventureWorksEntities())
{
    IQueryable<Contact> sortedContacts =
        from contact in context.Contacts
        orderby contact.LastName, contact.FirstName
        select contact;

    Console.WriteLine("The list of contacts sorted by last name then by first name:");
    foreach (Contact sortedContact in sortedContacts)
    {
        Console.WriteLine(sortedContact.LastName + ", " + sortedContact.FirstName);
    }
}

Using context As New AdventureWorksEntities
    Dim contacts As ObjectSet(Of Contact) = context.Contacts

    Dim sortedContacts = _
        From contact In contacts _
        Order By contact.LastName, contact.FirstName _
        Select contact

    Console.WriteLine("The list of contacts sorted by last name then by first name:")
    For Each sortedContact As Contact In sortedContacts
        Console.WriteLine(sortedContact.LastName + ", " + sortedContact.FirstName)
    Next
End Using

ThenByDescending

Contoh

Contoh berikut menggunakan OrderBy… Descending, yang setara dengan metode ThenByDescending, untuk mengurutkan daftar produk, pertama menurut nama, lalu menurut harga jual dari tertinggi ke terendah.

using (AdventureWorksEntities context = new AdventureWorksEntities())
{
    IQueryable<Product> query =
        from product in context.Products
        orderby product.Name, product.ListPrice descending
        select product;

    foreach (Product product in query)
    {
        Console.WriteLine("Product ID: {0} Product Name: {1} List Price {2}",
            product.ProductID,
            product.Name,
            product.ListPrice);
    }
}

Using context As New AdventureWorksEntities
    Dim products As ObjectSet(Of Product) = context.Products

    Dim query As IQueryable(Of Product) = _
        From product In products _
        Order By product.Name, product.ListPrice Descending _
        Select product

    For Each prod As Product In query
        Console.WriteLine("Product ID: {0} Product Name: {1} List Price {2}", _
            prod.ProductID, _
            prod.Name, _
            prod.ListPrice)
    Next
End Using

Lihat juga

• Kueri dalam LINQ ke Entitas