获取实体从表使用反射从抽象类型 [英] Get Entity From Table Using Reflection From Abstract Type
问题描述
好了,我有一个产品叫做抽象类。我有3个表称为项目,工具包,以及实现产品软件包。产品具有一个公开对象的主键的公共属性。
这是说我在那里我通过产品的形式。我想拉该产品出了新鲜的DataContext,而无需编写一个大的switch反映它的类型来获得其应有的表。
我要像做。这一点,但剧组位将不接受富
公共BuilderInclusionsForm(产品p):这个()
{
类型为foo = p.GetType();
产物= db2.GetTable(p.GetType())演员所述。foo的方式>()的SingleOrDefault(一个= GT;
a.ProductID == p.ProductID);
或这样的:
公共BuilderInclusionsForm(产品p):这个()
{
类型为foo = p.GetType();
产物= db2.GetTable(p.GetType())OfType&所述。foo的方式>()的SingleOrDefault(一个= GT;
a.ProductID == p.ProductID);
与感谢飞碟双向先生的美好会员我。团队指出了以下解决方案
公共BuilderInclusionsForm(产品p):这个()
{
IEnumerable的<产品与GT; 。PS = db2.GetTable(p.GetType())演员LT;产品>();
产品= ps.SingleOrDefault(A => a.ProductID == p.ProductID);
}
对不起,浪费你的时间。请不要垃圾收集我对不起屁股约翰。 = OD
Ok, so I have an abstract class called Product. I have 3 tables called Items, Kits, and Packages that implement Product. Product has a public property that exposes the object's primary key.
That said I have a form where I pass a product. I would would like to pull that product out of a fresh datacontext without having to write a big switch reflecting it's type to get its proper table.
I wanted to do something like this but the cast bit won't accept foo.
public BuilderInclusionsForm(Product p) : this()
{
Type foo = p.GetType();
product = db2.GetTable(p.GetType()).Cast<foo>().SingleOrDefault(a =>
a.ProductID == p.ProductID);
or this:
public BuilderInclusionsForm(Product p) : this()
{
Type foo = p.GetType();
product = db2.GetTable(p.GetType()).OfType<foo>().SingleOrDefault(a =>
a.ProductID == p.ProductID);
With thanks to Mr. Skeet a bright member of my team pointed out the following solution.
public BuilderInclusionsForm(Product p) : this()
{
IEnumerable<Product> ps = db2.GetTable(p.GetType()).Cast<Product>();
product = ps.SingleOrDefault(a => a.ProductID == p.ProductID);
}
Sorry to waste your time. Please don't garbage collect my sorry ass John. =oD
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