Top Method

ObjectQuery<T>.Top Method (String, ObjectParameter[])


Limits the query results to a specified number of items.

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

public ObjectQuery<T> Top(
	string count,
	params ObjectParameter[] parameters


Type: System.String

The number of items in the results as a string.

Type: System.Data.Objects.ObjectParameter[]

An optional set of query parameters that should be in scope when parsing.

Return Value

Type: System.Data.Objects.ObjectQuery<T>

A new ObjectQuery<T> instance that is equivalent to the original instance with TOP applied.

Exception Condition

count is null.


count is an empty string.

Top is nondeterministic unless the query is sorted.

When you use the Top method after the Skip method, it functions like the LIMIT statement of an ORDER BY clause.

These examples are based on the AdventureWorks Sales Model.

This example creates a new ObjectQuery<T> that contains the first two results of the existing query.

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.Top("2");

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

This example gets five Product objects after skipping the first three in the query result, sorted by Product.ListPrice. Top is used instead of LIMIT for paging.

using (AdventureWorksEntities context =
    new AdventureWorksEntities())
    // Define the parameters used to define the "page" of returned data.
    int skipValue = 3;
    int limitValue = 5;

    // Define a query that returns a "page" or the full 
    // Product data using the Skip and Top methods. 
    // When Top() follows Skip(), it acts like the LIMIT statement.
    ObjectQuery<Product> query = context.Products
        .Skip("it.ListPrice", "@skip",
                new ObjectParameter("skip", skipValue))
        .Top("@limit", new ObjectParameter("limit", limitValue));

    // Iterate through the page of Product items.
    foreach (Product result in query)
        Console.WriteLine("ID: {0}; Name: {1}",
        result.ProductID, result.Name);

.NET Framework
Available since 3.5
Return to top
© 2016 Microsoft