当我试图运行单元测试（MSTest的），我遇到了这个问题。 的code线：

When I try to run Unit Tests (mstest) I run into this issue. The line of code:

_mainCnStr = System.Configuration.ConfigurationManager.
               ConnectionStrings["main"].ConnectionString;

回来为空引用

Comes back as a null reference

这当我运行它并没有做到这一点，在主界面的项目。什么是正确的方法来获取该连接字符串设定看到的单元测试项目？我试图嵌入的资源。我想一直拷贝。什么是设置的最佳组合，这将解决这个问题对我？

It doesn't do this in the main UI project when I run it. What is the right method to get this connection string setting seen by the Unit Test project? I tried embedded as a resource. I tried Copy Always. What is the right combination of settings that will fix this for me?

推荐答案

您应该添加的app.config 的单元测试项目。它不会自动使用在设置UI应用程序的的app.config 。

You should add an app.config to the unit test project. It won't automatically use the settings in UI application's app.config.