C# 无法更改布尔值

一旦到期日结束，我将自动停用该用户。因此，在查看用户帐户详细信息时，超过到期日期的用户的帐户应显示为非活动状态（使用fa开关打开/关闭-显示帐户的活动/非活动状态-在代码中为布尔值true/false）

现有：

public IEnumerable<CustomerDetails> GetCustomerDetails(string groupName)
{
    IEnumerable<CustomerDetails> customers;

    var query = "select up.username, up.firstname, up.lastname, up.lastactivitydate, up.expirydate, " +
                            "up.activationdate, up.licensedby, up.position, up.isactive as isActiveUser, " +
                            "wr.rolename, up.usergroup, ul.contracttype as contracttype, ul.numberoflicense as " +
                            "licensesallowed from userprofile up inner join userlicense ul on ul.id = up.firmid inner join " +
                            "webpages_UsersInRoles wur on wur.userid =  up.userid inner join webpages_Roles wr on " +
                            "wr.roleid = wur.roleid where ul.firmname='" + firmname.Replace("'", "''") + "' order by up.lastname";

    using (IDbConnection dbConnection = new SqlConnection(UserDBConnectionString))
    {
        dbConnection.Open();

        using (var result = dbConnection.QueryMultiple(query, commandTimeout: 300))
        {
            var accounts = result.Read().ToList();

            customers = from account in accounts
                                         select new CustomerDetails
                                         {
                                             FirstName = account.firstname,
                                             LastName = account.lastname,
                                             UserName = account.username,
                                             PreviousUserName = account.username,
                                             Position = account.position,

                                             SharedSpace = JsonConvert.DeserializeObject<string[]>(account.usergroup),

                                             UserRole = account.rolename,
                                             IsActiveUser = account.isActiveUser,

                                             LastActivityDate = account.lastactivitydate != null
                                             ? account.lastactivitydate.ToString("yyyy/MM/dd")
                                             : "",

                                             ExpiryDate = TimeZoneInfo.ConvertTimeToUtc((DateTime)account.expirydate),

                                             ActivationDate = TimeZoneInfo.ConvertTimeToUtc((DateTime)account.activationdate),

                                             ContractType = account.contracttype.ToString().Trim(),

                                             LicensesAllowed = account.licensesallowed
                                         };
        }
    }
    return customers;
}

在单击“获取帐户详细信息”时

将从显示的数据库中提取详细信息

提取后，它将显示在应用程序中

我所做的是？

在单击“获取帐户详细信息”时

将从显示的数据库中提取详细信息

在向最终用户显示之前

我试图通过比较当前日期和到期日期来更改客户的活动/非活动详细信息

提取后，它将显示在应用程序中

现有代码：

public IEnumerable<CustomerDetails> GetCustomerDetails(string groupName)
{
    IEnumerable<CustomerDetails> customers;

    var query = "select up.username, up.firstname, up.lastname, up.lastactivitydate, up.expirydate, " +
                            "up.activationdate, up.licensedby, up.position, up.isactive as isActiveUser, " +
                            "wr.rolename, up.usergroup, ul.contracttype as contracttype, ul.numberoflicense as " +
                            "licensesallowed from userprofile up inner join userlicense ul on ul.id = up.firmid inner join " +
                            "webpages_UsersInRoles wur on wur.userid =  up.userid inner join webpages_Roles wr on " +
                            "wr.roleid = wur.roleid where ul.firmname='" + firmname.Replace("'", "''") + "' order by up.lastname";

    using (IDbConnection dbConnection = new SqlConnection(UserDBConnectionString))
    {
        dbConnection.Open();

        using (var result = dbConnection.QueryMultiple(query, commandTimeout: 300))
        {
            var accounts = result.Read().ToList();

            customers = from account in accounts
                                         select new CustomerDetails
                                         {
                                             FirstName = account.firstname,
                                             LastName = account.lastname,
                                             UserName = account.username,
                                             PreviousUserName = account.username,
                                             Position = account.position,

                                             SharedSpace = JsonConvert.DeserializeObject<string[]>(account.usergroup),

                                             UserRole = account.rolename,
                                             IsActiveUser = account.isActiveUser,

                                             LastActivityDate = account.lastactivitydate != null
                                             ? account.lastactivitydate.ToString("yyyy/MM/dd")
                                             : "",

                                             ExpiryDate = TimeZoneInfo.ConvertTimeToUtc((DateTime)account.expirydate),

                                             ActivationDate = TimeZoneInfo.ConvertTimeToUtc((DateTime)account.activationdate),

                                             ContractType = account.contracttype.ToString().Trim(),

                                             LicensesAllowed = account.licensesallowed
                                         };
        }
    }
    return customers;
}

编辑-1:

public IEnumerable<CustomerDetails> GetCustomerDetails(string groupName)
{
    IEnumerable<CustomerDetails> customers;

    var query = "select up.username, up.firstname, up.lastname, up.lastactivitydate, up.expirydate, " +
                            "up.activationdate, up.licensedby, up.position, up.isactive as isActiveUser, " +
                            "wr.rolename, up.usergroup, ul.contracttype as contracttype, ul.numberoflicense as " +
                            "licensesallowed from userprofile up inner join userlicense ul on ul.id = up.firmid inner join " +
                            "webpages_UsersInRoles wur on wur.userid =  up.userid inner join webpages_Roles wr on " +
                            "wr.roleid = wur.roleid where ul.firmname='" + firmname.Replace("'", "''") + "' order by up.lastname";

    using (IDbConnection dbConnection = new SqlConnection(UserDBConnectionString))
    {
        dbConnection.Open();

        using (var result = dbConnection.QueryMultiple(query, commandTimeout: 300))
        {
            var accounts = result.Read().ToList();

            customers = from account in accounts
                                         select new CustomerDetails
                                         {
                                             FirstName = account.firstname,
                                             LastName = account.lastname,
                                             UserName = account.username,
                                             PreviousUserName = account.username,
                                             Position = account.position,

                                             SharedSpace = JsonConvert.DeserializeObject<string[]>(account.usergroup),

                                             UserRole = account.rolename,
                                             IsActiveUser = account.isActiveUser,

                                             LastActivityDate = account.lastactivitydate != null
                                             ? account.lastactivitydate.ToString("yyyy/MM/dd")
                                             : "",

                                             ExpiryDate = TimeZoneInfo.ConvertTimeToUtc((DateTime)account.expirydate),

                                             ActivationDate = TimeZoneInfo.ConvertTimeToUtc((DateTime)account.activationdate),

                                             ContractType = account.contracttype.ToString().Trim(),

                                             LicensesAllowed = account.licensesallowed
                                         };
        }
    }
    return customers;
}

正如我在评论中所说，我可以将这里的值从true改为false，反之亦然

编辑-2:

public IEnumerable<CustomerDetails> GetCustomerDetails(string groupName)
{
    IEnumerable<CustomerDetails> customers;

    var query = "select up.username, up.firstname, up.lastname, up.lastactivitydate, up.expirydate, " +
                            "up.activationdate, up.licensedby, up.position, up.isactive as isActiveUser, " +
                            "wr.rolename, up.usergroup, ul.contracttype as contracttype, ul.numberoflicense as " +
                            "licensesallowed from userprofile up inner join userlicense ul on ul.id = up.firmid inner join " +
                            "webpages_UsersInRoles wur on wur.userid =  up.userid inner join webpages_Roles wr on " +
                            "wr.roleid = wur.roleid where ul.firmname='" + firmname.Replace("'", "''") + "' order by up.lastname";

    using (IDbConnection dbConnection = new SqlConnection(UserDBConnectionString))
    {
        dbConnection.Open();

        using (var result = dbConnection.QueryMultiple(query, commandTimeout: 300))
        {
            var accounts = result.Read().ToList();

            customers = from account in accounts
                                         select new CustomerDetails
                                         {
                                             FirstName = account.firstname,
                                             LastName = account.lastname,
                                             UserName = account.username,
                                             PreviousUserName = account.username,
                                             Position = account.position,

                                             SharedSpace = JsonConvert.DeserializeObject<string[]>(account.usergroup),

                                             UserRole = account.rolename,
                                             IsActiveUser = account.isActiveUser,

                                             LastActivityDate = account.lastactivitydate != null
                                             ? account.lastactivitydate.ToString("yyyy/MM/dd")
                                             : "",

                                             ExpiryDate = TimeZoneInfo.ConvertTimeToUtc((DateTime)account.expirydate),

                                             ActivationDate = TimeZoneInfo.ConvertTimeToUtc((DateTime)account.activationdate),

                                             ContractType = account.contracttype.ToString().Trim(),

                                             LicensesAllowed = account.licensesallowed
                                         };
        }
    }
    return customers;
}

//客户类别结构

public class CustomerDetails
{
    public string FirstName { get; set; }

    public string LastName { get; set; }

    public bool IsActiveUser { get; set; }
    // some other fields ... goes here
}

我不知道在将值设置为false之后，它如何仍然是真的

你是暴力的受害者

在这里，您可以在每次呼叫

客户时查询数据库三次

var beforeChanged = customers.ElementAt(i).IsActiveUser; 

customers.ElementAt(i).IsActiveUser = false;

var afterChanged = customers.ElementAt(i).IsActiveUser;

每次都从数据库加载对象，这就是为什么看不到任何更改。数据库保持不变

在构建select时，您需要具体化查询，可以通过调用客户上的
.ToArray（）
或
ToList（）
。
问题：客户是一个IEnumerable/IQueryable，而不是一个固定列表。它是“如何交付对象的定义”，而不是实际或稳定对象的列表每次对“元素”的引用都会导致
客户查阅其来源（列表），并在检索时创建全新的对象。每一个单身。。。时间

解决方案：确保使用持久化函数（如ToArray（）或ToList（））创建
客户。
能否向我们显示CustomerDetails类？可能是因为
执行延迟？您的
客户
似乎属于
IEnumerable
类型。另一种可能性是，由于
IsActiveUser
是
属性
，其
设置器
可能由于某些内部原因不允许您将值设置为
false
…尝试更改
退货客户
to
return customers.ToArray（）
并查看问题是否消失。正如@Ian所说，问题在于执行延迟，您实际上是在两次枚举查询，每次都会给您一个新的
客户详细信息列表。因此，当UI显示列表时，它不会显示您对第一个列表所做的更改。通常，不要在数据库中存储可以从现有数据计算得出的数据。如果将非活动用户定义为过期日期在过去的用户，为什么需要存储
IsActiveUser
？感谢您向我解释此问题。现在我明白了。