首先通过WCF使用EF数据库执行查询

Question

I'm new to .NET development and I have a backend DB on SQL server which I have generated from Database with Entity Framework.

I now want to access the data using WCF - How does one query a database through a windows service or, in general, query a database first DB?

Thanks

Answer 1

The simple answer is that you should look to abstract away your database logic behind your web services. For example each WCF web service should provide CRUD (create read update delete) functions for a given entity (eg user).

Answer 2

I assume you have made an EF model with your db?

EF will have created a Context class for you (probably a DbContext depending on the version of EF used).

You can then instantiate an object of this class, and perform operations against it such as querying. It will contain the DbSet collections matching your tables/collections defined in your model.

So, for example, I have created a model which contains one table called 'Products' and I can perform queries against the db using the generated context like this:

var context = new MyGeneratedContextClass();
var results = context.Products.Where(x=>x.ProductId.Equals(42));

Answer 3

签出WCF数据服务 ，这使您可以非常轻松地将Entity Framework模型（或其一部分）公开为REST / OData Web服务。