ObjectParameterCollection.Contains ObjectParameterCollection.Contains ObjectParameterCollection.Contains ObjectParameterCollection.Contains Method

指定した ObjectParameter がコレクション内に存在するかどうかを参照によって確認します。Checks for the existence of a specified ObjectParameter in the collection by reference.

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

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

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

Public Function Contains (parameter As ObjectParameter) As Boolean

パラメーター

戻り値

実装

例外

注釈

これは参照に基づく確認です。This is a reference-based check. つまり、コレクション内のObjectParameterパラメーターオブジェクトと同じ名前を持つが指定されている場合、このメソッドは、同じtrueオブジェクトである場合にのみを返します。That is, if an ObjectParameter is specified that contains the same name as a parameter object in the collection, this method will only return true if it is the same object.

指定した名前の ObjectParameter がコレクション内に存在するかどうかを調べます。Determines whether an ObjectParameter with the specified name is in the collection.

public:
 bool Contains(System::String ^ name);

public bool Contains (string name);

member this.Contains : string -> bool

Public Function Contains (name As String) As Boolean

パラメーター

戻り値

例外

例

このトピックの例は、 AdventureWorks Sales Modelに基づいています。The example in this topic is based on the AdventureWorks Sales Model. この例では、Contains メソッドを使用して、指定したパラメーターがコレクション内に存在するかどうかを調べます。The example uses the Contains method to determine whether the specified parameter is 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;

    if (objectParameterCollection.Contains("ln"))
        Console.WriteLine("ln is here");
    else
        Console.WriteLine("ln is not here");
}

Using context As New AdventureWorksEntities()
    Dim queryString As String = "SELECT VALUE contact FROM AdventureWorksEntities.Contacts " & _
            " AS contact WHERE contact.LastName = @ln AND contact.FirstName = @fn"

    Dim contactQuery As New ObjectQuery(Of Contact)(queryString, context)

    ' Add parameters to the collection. 
    contactQuery.Parameters.Add(New ObjectParameter("ln", "Adams"))
    contactQuery.Parameters.Add(New ObjectParameter("fn", "Frances"))

    Dim objectParameterCollection As ObjectParameterCollection = contactQuery.Parameters

    If objectParameterCollection.Contains("ln") Then
        Console.WriteLine("ln is here")
    Else
        Console.WriteLine("ln is not here")
    End If
End Using