本文整理匯總了VB.NET中System.Data.Objects.DataClasses.EntityCollection<TEntity>.Contains方法的典型用法代碼示例。如果您正苦於以下問題：VB.NET EntityCollection<TEntity>.Contains方法的具體用法？VB.NET EntityCollection<TEntity>.Contains怎麽用？VB.NET EntityCollection<TEntity>.Contains使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類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個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
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