摘要：
public class User { public long UserId { get; set; } public string UserName { get; set; } public string UserPwd { get; set; } ... 阅读全文
摘要：
在实体对象中访问导航属性里的属性值出现异常“There is already an open DataReader associated with this Command which must be closed first”。public class User { publi... 阅读全文