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!

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