C# an error has occurred while updating the entries.see the log file

message:An error occurred while updating the entries. See the inner exception for details.

C# 在执行插入方法时出现 An error occurred while updating the entries. See the inner exception for details.错误有两种可能

1，主键没有赋值，根据SQL-Server设计原则主键是自增的，应该自动生成

2，CreateTime 没有赋值