ParameterType Property
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ObjectParameter.ParameterType Property


Gets the parameter type.

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

public Type ParameterType { get; }

Property Value

Type: System.Type

The Type of the parameter.

The parameter type can only be set through a constructor.

The example in this topic is based on the AdventureWorks Sales Model. The example adds new parameters to the collection. It iterates through the ObjectParameterCollection and displays the name, type, and value of each parameter in the collection.

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

    ObjectQuery<Contact> contactQuery =
        new ObjectQuery<Contact>(queryString, context);

    // Add parameters to the collection.
    contactQuery.Parameters.Add(new ObjectParameter("ln", "Adams"));
    contactQuery.Parameters.Add(new ObjectParameter("fn", "Frances"));

    ObjectParameterCollection objectParameterCollection =

    // Iterate through the ObjectParameterCollection.
    foreach (ObjectParameter result in objectParameterCollection)
        Console.WriteLine("{0} {1} {2}", result.Name,

.NET Framework
Available since 3.5
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