本文整理汇总了C#中System.Data.EntityKey.EntityKey构造函数的典型用法代码示例。如果您正苦于以下问题：C# EntityKey构造函数的具体用法？C# EntityKey怎么用？C# EntityKey使用的例子？那么恭喜您, 这里精选的构造函数代码示例或许可以为您提供帮助。您也可以进一步了解该构造函数所在类System.Data.EntityKey的用法示例。
在下文中一共展示了EntityKey构造函数的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())
{
try
{
// Create the key that represents the order.
EntityKey orderKey =
new EntityKey("AdventureWorksEntities.SalesOrderHeaders",
"SalesOrderID", orderId);
// Create the stand-in SalesOrderHeader object
// based on the specified SalesOrderID.
SalesOrderHeader order = new SalesOrderHeader();
order.EntityKey = orderKey;
// Assign the ID to the SalesOrderID property to matche the key.
order.SalesOrderID = (int)orderKey.EntityKeyValues[0].Value;
// Attach the stand-in SalesOrderHeader object.
context.SalesOrderHeaders.Attach(order);
// Create a new SalesOrderDetail object.
// You can use the static CreateObjectName method (the Entity Framework
// adds this method to the generated entity types) instead of the new operator:
// SalesOrderDetail.CreateSalesOrderDetail(1, 0, 2, 750, 1, (decimal)2171.2942, 0, 0,
// Guid.NewGuid(), DateTime.Today));
SalesOrderDetail detail = new SalesOrderDetail
{
SalesOrderID = orderId,
SalesOrderDetailID = 0,
OrderQty = 2,
ProductID = 750,
SpecialOfferID = 1,
UnitPrice = (decimal)2171.2942,
UnitPriceDiscount = 0,
LineTotal = 0,
rowguid = Guid.NewGuid(),
ModifiedDate = DateTime.Now
};
order.SalesOrderDetails.Add(detail);
context.SaveChanges();
}
catch (InvalidOperationException)
{
Console.WriteLine("Ensure that the key value matches the value of the object's ID property.");
}
catch (UpdateException)
{
Console.WriteLine("An error has occurred. Ensure that an object with the '{0}' key value exists.",
orderId);
}
}