ObjectQuery.Parameters 属性

public:
 property System::Data::Objects::ObjectParameterCollection ^ Parameters { System::Data::Objects::ObjectParameterCollection ^ get(); };

public System.Data.Objects.ObjectParameterCollection Parameters { get; }

member this.Parameters : System.Data.Objects.ObjectParameterCollection

Public ReadOnly Property Parameters As ObjectParameterCollection

属性值

此 ObjectQuery<T>参数集合 。

示例

本示例向集合添加新参数，然后获取此 ObjectQuery<T>参数集合。 然后循环访问 ObjectParameterCollection 集合中每个参数的名称、类型和值。

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);
    }
}

注解

使用返回 ObjectParameterCollection 的参数指定传递给查询的参数。 有关详细信息，请参阅 查询生成器方法。

另请参阅

• 将数据查询为对象（实体框架）