本文整理汇总了VB.NET中System.Data.Objects.DataClasses.EntityCollection<TEntity>.Contains方法的典型用法代码示例。如果您正苦于以下问题：VB.NET EntityCollection<TEntity>.Contains方法的具体用法？VB.NET EntityCollection<TEntity>.Contains怎么用？VB.NET EntityCollection<TEntity>.Contains使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Data.Objects.DataClasses.EntityCollection<TEntity>的用法示例。
在下文中一共展示了EntityCollection<TEntity>.Contains方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: AdventureWorksEntities
Using context As New AdventureWorksEntities()
Dim contact As New Contact()
' Create a new SalesOrderHeader.
Dim newSalesOrder1 As New SalesOrderHeader()
' Add SalesOrderHeader to the Contact.
contact.SalesOrderHeaders.Add(newSalesOrder1)
' Create another SalesOrderHeader.
Dim newSalesOrder2 As New SalesOrderHeader()
' Add SalesOrderHeader to the Contact.
contact.SalesOrderHeaders.Add(newSalesOrder2)
' Get all related ends
Dim relEnds As IEnumerable(Of IRelatedEnd) = DirectCast(contact, IEntityWithRelationships).RelationshipManager.GetAllRelatedEnds()
For Each relEnd As IRelatedEnd In relEnds
' Get Entity Collection from related end
Dim entityCollection As EntityCollection(Of SalesOrderHeader) = DirectCast(relEnd, EntityCollection(Of SalesOrderHeader))
Console.WriteLine("EntityCollection count: {0}", entityCollection.Count)
' Remove the first entity object.
entityCollection.Remove(newSalesOrder1)
Dim contains As Boolean = entityCollection.Contains(newSalesOrder1)
' Write the number of items after one entity has been removed
Console.WriteLine("EntityCollection count after one entity has been removed: {0}", entityCollection.Count)
If contains = False Then
Console.WriteLine("The removed entity is not in in the collection any more.")
End If
'Use IRelatedEnd to add the entity back.
relEnd.Add(newSalesOrder1)
Console.WriteLine("EntityCollection count after an entity has been added again: {0}", entityCollection.Count)
Next
End Using