ConstraintCollection.Contains(String) 方法

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

public bool Contains(string? name);

public bool Contains(string name);

member this.Contains : string -> bool

Public Function Contains (name As String) As Boolean

参数

返回

true 如果集合包含指定的约束，则为 ;否则，为 false.

示例

以下示例确定指定ConstraintConstraintCollection在删除之前是否存在。

public static void RemoveConstraint(
    ConstraintCollection constraints, Constraint constraint)
{
    try
    {
        if(constraints.Contains(constraint.ConstraintName))
        {
            if(constraints.CanRemove(constraint))
            {
                constraints.Remove(constraint.ConstraintName);
            }
        }
    }
    catch(Exception e)
    {
        // Process exception and return.
        Console.WriteLine("Exception of type {0} occurred.",
            e.GetType());
    }
}

Public Shared Sub RemoveConstraint( _
    constraints As ConstraintCollection, constraint As Constraint)
    Try
        If constraints.Contains(constraint.ConstraintName) Then
            If constraints.CanRemove(constraint)
                constraints.Remove(constraint.ConstraintName)
            End If
        End If

    Catch e As Exception
        ' Process exception and return.
        Console.WriteLine($"Exception of type {e.GetType()} occurred.")
    End Try
 End Sub

注解

Contains使用该方法确定指定Constraint是否存在，然后再尝试将其从集合中删除。 还可以使用 CanRemove 该方法来确定是否可以删除 a Constraint 。

另请参阅

• Remove(Constraint)