ObjectContext.CreateQuery(Of T) Method
Creates an ObjectQuery(Of T) in the current object context by using the specified query string.
Assembly: System.Data.Entity (in System.Data.Entity.dll)
public ObjectQuery<T> CreateQuery<T>( string queryString, params ObjectParameter[] parameters )
Type Parameters
- T
The entity type of the returned ObjectQuery(Of T).
Parameters
- queryString
- Type: System.String
The query string to be executed.
- parameters
- Type: System.Data.Objects.ObjectParameter()
Parameters to pass to the query.
| Exception | Condition |
|---|---|
| ArgumentNullException |
The queryString or parameters parameter is Nothing. |
Use CreateQuery(Of T) to create an ObjectQuery(Of T) of the specified type that belongs to the current object context.
This example is based on the Adventure Works 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 = context.CreateQuery<Contact>(queryString, 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); }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.