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ObjectParameter.Value Property

Gets or sets the parameter value.

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

public Object Value { get; set; }

Property Value

Type: System.Object
The parameter value.

After the query has been compiled, the value cannot be changed. For more information, see Query Builder Methods (Entity Framework).

If the new value is incompatible with the type declared in the constructor, it might cause a run-time exception. The provider must determine whether the value is compatible with the declared type. For example, if the initial type is Int32 and the new value is Guid, you might receive an exception.

The example in this topic is based on the Adventure Works Sales Model. The example adds new parameters to the collection. It iterates through the ObjectParameterCollection and displays the name, the type and the 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 =
        contactQuery.Parameters;

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


.NET Framework

Supported in: 4, 3.5 SP1

.NET Framework Client Profile

Supported in: 4

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.
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