单个Wcf数据服务的多个数据上下文 [英] Multiple Data context for a single Wcf data service

问题描述

我创建了一个Wcf数据服务，其Datacontext是Linq to Sql类，直接映射到特定数据库。现在我想添加一个自定义类/集合（我在其中随机生成一些数字，而不是与db交互）
 在现有的Linq to sql上下文中进行演示。

I have created a Wcf Data Service whose Datacontext is a Linq to Sql class, that is mapped directly to a  particular database. Now I wanted to add a custom class /collection (where in I randomly generate some numbers, rather than interacting with db)  inside the existing Linq to sql context to give a demo.

linqtosql上下文中的所有类都与DB表一起映射。我可以在现有的datacontextclass中添加自定义数据源类并为其编写Iqueryables吗？

All classes inside the linqtosql context are mapped with the DB tables. Can I add a custom data source class and write Iqueryables for it within the existing datacontextclass?

我应该如何进行以便我不需要为每个创建单独的wcf数据服务数据来源...

How should I go about so that I don't need to create a separate wcf data service for each Data source...

请帮助紧急。

 

谢谢

推荐答案

你应该能够做到这一点。 LINQ to SQL工具（O / R设计器）生成强类型DataContext类作为分部类。这使您可以扩展此上下文以添加其他IQueryable< TEntity>未映射到
数据库的属性。您必须确保新的IQueryable< TEntity>公开一个实体类型，您可以使用DataServiceEntity或DataServiceKey属性来表示，类似于以下完全组成的示例：

You should be able to do this. The LINQ to SQL tools (O/R Designer) generates the strongly-typed DataContext class as a partial class. This enables you to extend this context to add other IQueryable<TEntity> properties that are not mapped to the database. You must make sure that the new IQueryable<TEntity> exposes an entity type, which you can denote with the DataServiceEntity or DataServiceKey attribute, something like the following totally made up example:

public partial class MyTypedDataContext
  {
    public IQueryable<SomeType> MyTypes
    {
      get
      {
        List<SomeType> types = new List<SomeType>();
        for (int i=0; i <2; i++)
        {
          types.Add(new SomeType(i, "string" + i.ToString()));
        }
        return types.AsQueryable<SomeType>();
      }
    }

  }

  [System.Data.Services.Common.DataServiceKey("Key")]
  public class SomeType
  {
    public SomeType(int key, string prop)
    {
      this.Key = key;
      this.Prop = prop;
    }
  
    public int Key {get; set;}
    

    public string Prop { get; set;}
      
  }

这篇关于单个Wcf数据服务的多个数据上下文的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！