本文整理汇总了C#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：C# EntityCollection<TEntity>.Contains方法的具体用法？C# EntityCollection<TEntity>.Contains怎么用？C# 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C#代码示例。
示例1: using
//引入命名空间
using (AdventureWorksEntities context =
new AdventureWorksEntities())
{
Contact contact = new Contact();
// Create a new SalesOrderHeader.
SalesOrderHeader newSalesOrder1 = new SalesOrderHeader();
// Add SalesOrderHeader to the Contact.
contact.SalesOrderHeaders.Add(newSalesOrder1);
// Create another SalesOrderHeader.
SalesOrderHeader newSalesOrder2 = new SalesOrderHeader();
// Add SalesOrderHeader to the Contact.
contact.SalesOrderHeaders.Add(newSalesOrder2);
// Get all related ends
IEnumerable<IRelatedEnd> relEnds =
((IEntityWithRelationships)contact)
.RelationshipManager.GetAllRelatedEnds();
foreach (IRelatedEnd relEnd in relEnds)
{
// Get Entity Collection from related end
EntityCollection<SalesOrderHeader> entityCollection =
(EntityCollection<SalesOrderHeader>)relEnd;
Console.WriteLine("EntityCollection count: {0}",
entityCollection.Count);
// Remove the first entity object.
entityCollection.Remove(newSalesOrder1);
bool contains = 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)
Console.WriteLine("The removed entity is not in in the collection any more.");
//Use IRelatedEnd to add the entity back.
relEnd.Add(newSalesOrder1);
Console.WriteLine("EntityCollection count after an entity has been added again: {0}",
entityCollection.Count);
}
}