您的连接字符串称为 DBEntities
DBEntities
请在代码中使用此行：
String connString = ConfigurationManager.ConnectionStrings["DBEntities"].ConnectionString;
Your connection string is called DBEntities
Use this line in your code instead:
这只是一个猜测，因为您没有在问题中包含实际的异常：
将对 System.Configuration 的引用添加到您的项目中。
System.Configuration
This is only a guess since you didn't include the actual exception in your question:
Add a reference to System.Configuration to your project.
此外，您的名称属性的值为 DBEntities，但您正尝试在代码中访问 ApplicationServices。
ApplicationServices
Also, your name-attribute's value is DBEntities, but you are trying to access ApplicationServices in your code.
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您的连接字符串称为
DBEntities请在代码中使用此行：
Your connection string is called
DBEntitiesUse this line in your code instead:
这只是一个猜测，因为您没有在问题中包含实际的异常：
将对
System.Configuration的引用添加到您的项目中。This is only a guess since you didn't include the actual exception in your question:
Add a reference to
System.Configurationto your project.此外，您的名称属性的值为
DBEntities，但您正尝试在代码中访问ApplicationServices。Also, your name-attribute's value is
DBEntities, but you are trying to accessApplicationServicesin your code.