过滤子列表记录以及父列表字段

Question

我想过滤具有ModelLogin.LoginDate = dateTimeToday 和ModelLoginRecords.LoginPurpose = "Update" 的记录。

结果必须是一个 ModelLogin 列表，它的 LoginDate(dateTimeToday) 和 LoginRecords 子列表只有 "Update"。

模型 1

public class ModelLogin
{
    public DateTime LoginDate;
    public List<ModelLoginRecords> LoginRecords;

    public ModelLogin(DateTime LoginDate, List<ModelLoginRecords> LoginRecords)
    {
        this.LoginDate = LoginDate;
        this.LoginRecords = LoginRecords;
    }
}

模型 2

public class ModelLoginRecords
{
    public string UserName;
    public string LoginPurpose;

    public ModelLoginRecords(string UserName, string LoginPurpose)
    {
        this.UserName = UserName;
        this.LoginPurpose = LoginPurpose;
    }
}

样本数据

        List<ModelLogin> listLogins = new List<ModelLogin>();

        List<ModelLoginRecords> loginRecordsList = new List<ModelLoginRecords>();
        loginRecordsList.Add(new ModelLoginRecords("Alex", "Update"));
        loginRecordsList.Add(new ModelLoginRecords("David", "Update"));
        loginRecordsList.Add(new ModelLoginRecords("Jason", "Remove"));
        listLogins.Add(new ModelLogin(dateTimeToday, loginRecordsList));

        loginRecordsList = new List<ModelLoginRecords>();
        loginRecordsList.Add(new ModelLoginRecords("Kate", "Update"));
        loginRecordsList.Add(new ModelLoginRecords("William", "Remove"));
        listLogins.Add(new ModelLogin(dateTimeYesterday, loginRecordsList));

Answer 1

请检查下面的代码。

public class Test
{
    [Fact]
    public void test()
    {
        //arrange
        var updatePurpose = "Update";
        var removePurpose = "Remove";

        List<ModelLogin> listLogins = new();
        var dateTimeToday = DateTime.Today;
        var dateTimeYesterday = dateTimeToday.AddDays(-1);

        List<ModelLoginRecords> loginRecordsList = new();

        loginRecordsList.Add(new ModelLoginRecords("Alex", updatePurpose));
        loginRecordsList.Add(new ModelLoginRecords("David", updatePurpose));
        loginRecordsList.Add(new ModelLoginRecords("Jason", removePurpose));
        listLogins.Add(new ModelLogin(dateTimeToday, loginRecordsList));

        loginRecordsList = new List<ModelLoginRecords>
        {
            new ModelLoginRecords("Kate", updatePurpose),
            new ModelLoginRecords("William", removePurpose)
        };
        listLogins.Add(new ModelLogin(dateTimeYesterday, loginRecordsList));

        //act
        var loginModelsWithUpdatePurpose = listLogins.Where(listLogin =>
            listLogin.LoginDate.Date == dateTimeToday.Date &&
            listLogin.LoginRecords.Any(i => i.LoginPurpose == updatePurpose)
        ).Select(i =>
            new ModelLogin(
                i.LoginDate,
                i.LoginRecords.Where(j => j.LoginPurpose == updatePurpose).ToList()
            )
        ).ToList();

        //assert
        foreach (var loginModel in loginModelsWithUpdatePurpose)
            Assert.DoesNotContain(loginModel.LoginRecords, i => i.LoginPurpose != updatePurpose);
    }
}

public class ModelLoginRecords
{
    public string UserName { get; private set; }
    public string LoginPurpose { get; private set; }

    public ModelLoginRecords(string userName, string loginPurpose)
    {
        UserName = userName;
        LoginPurpose = loginPurpose;
    }
}

public class ModelLogin
{
    public DateTime LoginDate { get; private set; }
    public IEnumerable<ModelLoginRecords> LoginRecords { get; private set; }

    public ModelLogin(DateTime loginDate, IEnumerable<ModelLoginRecords> loginRecords)
    {
        LoginDate = loginDate;
        LoginRecords = loginRecords;
    }
}