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ObjectQuery<T>.OrderBy Method

Orders the query results by the specified criteria.

Namespace:  System.Data.Objects
Assembly:  System.Data.Entity (in System.Data.Entity.dll)

public ObjectQuery<T> OrderBy(
	string keys,
	params ObjectParameter[] parameters
)

Parameters

keys
Type: System.String

The key columns by which to order the results.

parameters
Type: System.Data.Objects.ObjectParameter[]

Zero or more parameters that are used in this method.

Return Value

Type: System.Data.Objects.ObjectQuery<T>
A new ObjectQuery<T> instance that is equivalent to the original instance with ORDER BY applied.

ExceptionCondition
ArgumentNullException

The keys or parameters parameter is null.

ArgumentException

The key is an empty string.

The ordering of results in a nested query cannot be guaranteed.

OrderBy should always be the final query builder method in the sequence.

This example is based on the Adventure Works Sales Model. The example creates a new ObjectQuery<T> object that contains the results of the existing query order by ProductID.

using (AdventureWorksEntities context =
    new AdventureWorksEntities())
{
    string queryString = @"SELECT VALUE product 
        FROM AdventureWorksEntities.Products AS product";

    ObjectQuery<Product> productQuery1 =
        new ObjectQuery<Product>(queryString,
            context, MergeOption.NoTracking);

    ObjectQuery<Product> productQuery2 =
        productQuery1.OrderBy("it.ProductID");

    // Iterate through the collection of Product items. 
    foreach (Product result in productQuery2)
    {
        Console.WriteLine("{0}", result.ProductID);
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5 SP1

.NET Framework Client Profile

Supported in: 4
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