再次修改或者删除就不会出现此错误,因为Entity Framework 4也是第一次使用 这错误也找了很久
今天有点时间,就耐着性子去google解决办法
找了很久 最后在一个老外的评论回复里找到解决办法
"This operation requires a connection to the
'master' database. Unable to create a connection to the 'master' database
because the original database connection has been opened and credentials have
been removed from the connection string. Supply an unopened connection."
I had this error and solved it by adding "Persist
Security Info=true" to the connection string.
意思是在连接字符串上要加 Persist Security Info=true
Persist Security Info=true
的意思是让.net一直保存着连接密码，默认是为false的
只是不明白 为什么在出现一次错误后 第二次就不会出现 难道出现过错误
.net就自动把密码给保存上了？