1 <?xml version="1.0" encoding="utf-8" ?> 2 <configuration> 3 <connectionStrings> 4 5 <add name="str" connectionString="Data Source = .\SQLExpress2008; Initial Catalog=Movie;Integrated Security=True"/> 6 </connectionStrings> 7 </configuration>
在App.config配置文件中，主机名并没有改成自己的主机名，导致无法识别，更改后如下：
1 <?xml version="1.0" encoding="utf-8" ?> 2 <configuration> 3 <connectionStrings> 4 5 <add name="str" connectionString="Data Source=PC201503301006;Initial Catalog=Movie;Integrated Security=True"/> 6 </connectionStrings> 7 </configuration>
再次运行程序，结果正常！
原文：http://www.cnblogs.com/liuyaozhi/p/4937635.html