ObjectParameterCollection.Remove(ObjectParameter) 方法

public:
 virtual bool Remove(System::Data::Objects::ObjectParameter ^ parameter);

public bool Remove(System.Data.Objects.ObjectParameter parameter);

abstract member Remove : System.Data.Objects.ObjectParameter -> bool
override this.Remove : System.Data.Objects.ObjectParameter -> bool

Public Function Remove (parameter As ObjectParameter) As Boolean

参数

返回

true 如果找到并删除了集合中的参数对象，则为 ;否则，为 false.

实现

例外

示例

本示例向集合中添加两个参数，然后删除参数。

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 ObjectQuery's Parameters collection.
    contactQuery.Parameters.Add(new ObjectParameter("ln", "Adams"));
    contactQuery.Parameters.Add(new ObjectParameter("fn", "Frances"));

    ObjectParameterCollection objectParameterCollection =
        contactQuery.Parameters;
    Console.WriteLine("Count before Remove is called: {0}",
        objectParameterCollection.Count);

    ObjectParameter objectParameter = objectParameterCollection["ln"];

    // Remove the specified parameter from the collection.
    objectParameterCollection.Remove(objectParameter);
    Console.WriteLine("Count after Remove is called: {0}",
        objectParameterCollection.Count);
}

注解

这是基于引用的比较。 也就是说，如果指定了包含与集合中的参数对象同名的查询参数对象，则仅当集合中的参数是同一对象时，才会删除该集合中的参数。 若要按名称删除对象，请先使用索引器检索参数实例，然后使用此方法将其删除。