ObjectContext.CreateQuery<T> Method (String, ObjectParameter[])


Creates an ObjectQuery<T> in the current object context by using the specified query string.

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

public ObjectQuery<T> CreateQuery<T>(
	string queryString,
	params ObjectParameter[] parameters


Type: System.String

The query string to be executed.

Type: System.Data.Objects.ObjectParameter[]

Parameters to pass to the query.

Return Value

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

An ObjectQuery<T> of the specified type.

Type Parameters


The entity type of the returned ObjectQuery<T>.

Exception Condition

The queryString or parameters parameter is null.

Use CreateQuery<T> to create an ObjectQuery<T> of the specified type that belongs to the current object context.

This example is based on the AdventureWorks Sales Model.

The example creates a simple query and iterates through the collection of results.

using (AdventureWorksEntities context =
    new AdventureWorksEntities())
    string queryString =
        @"SELECT VALUE contact FROM AdventureWorksEntities.Contacts 
            AS contact WHERE contact.FirstName = @fn";

    ObjectQuery<Contact> contactQuery =
            new ObjectParameter("fn", "Frances"));

    // Iterate through the collection of Contact items.
    foreach (Contact result in contactQuery)
        Console.WriteLine("First Name: {0}, Last Name: {1}",
        result.FirstName, result.LastName);

.NET Framework
Available since 3.5
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