如何返回一组分组项？

如何解决如何返回一组分组项？

我有一个简单的[array([[[-1.36013642e-01,1.59766637e-02,4.49674837e-02,2.87157446e-02,-9.56720412e-02,-8.88903514e-02,-5.33084199e-02,-2.13210974e-02,1.41174316e-01,-4.11187410e-02,1.70307457e-01,-2.14784797e-02,-1.35124326e-01,-1.13939375e-01,-3.31919976e-02,6.11963794e-02,-1.17217958e-01,-1.50817335e-01,-4.65203971e-02,-1.00571744e-01,7.85203278e-02,2.94833463e-02,1.02086905e-02,1.93061940e-02,-2.32153490e-01,-3.00551683e-01,-1.17443979e-01,-1.46142572e-01,1.07608363e-01,-9.40902233e-02,-3.90545353e-02,4.42864373e-02,-1.29430681e-01,-7.02960119e-02,8.21319446e-02,1.80883124e-01,-2.02056542e-02,-2.47046854e-02,1.82081938e-01,3.43354326e-03,-1.19226977e-01,-5.64751402e-03,5.98295629e-02,3.01894635e-01,1.70621589e-01,1.36449412e-01,4.88062464e-02,-4.68050130e-02,1.07072420e-01,-2.24809378e-01,1.33529887e-01,1.69836447e-01,1.21353425e-01,3.47930416e-02,2.27185443e-01,-2.41639778e-01,3.87575626e-02,1.36878729e-01,-1.31427586e-01,1.35682166e-01,-8.80223699e-04,1.59485396e-02,2.62592174e-02,-3.75868753e-02,1.91311508e-01,6.34296760e-02,-6.77121654e-02,-9.76699442e-02,1.88637391e-01,-1.95635721e-01,2.61483667e-03,1.27198607e-01,-7.48684406e-02,-1.59019291e-01,-2.47020170e-01,-3.68376747e-02,4.33871210e-01,1.57070860e-01,-1.62113741e-01,3.82730290e-02,-3.92096601e-02,-4.57221121e-02,9.67647210e-02,-6.17119949e-05,-1.43869311e-01,-6.41668867e-03,-1.91071168e-01,-2.21797563e-02,2.02202812e-01,3.91443223e-02,4.61347327e-02,1.54131114e-01,7.47928210e-03,2.09267866e-02,3.87379229e-02,-5.46494387e-02,-1.59527451e-01,7.56314816e-03,-2.13688631e-02,-5.44707663e-02,6.98875338e-02,-1.67583689e-01,-1.69844925e-03,9.92566273e-02,-1.98496655e-01,6.26156628e-02,-2.95266993e-02,5.99580631e-03,-6.91434443e-02,3.17127258e-02,-1.32520899e-01,2.55816411e-02,1.90661669e-01,-2.88114160e-01,1.65751979e-01,1.89788476e-01,-3.19299102e-02,1.52912185e-01,8.25165361e-02,6.92607239e-02,-2.91225202e-02,-3.67325470e-02,-1.58863515e-01,-4.12161574e-02,-9.37818438e-02,-1.08723141e-01,1.27439285e-02,7.31237382e-02]],[[-1.37894586e-01,5.84010258e-02,9.80348736e-02,-9.55949910e-03,-6.22733906e-02,-5.63683398e-02,-2.26371922e-02,-8.96835402e-02,1.46475613e-01,-4.40802239e-02,1.53038278e-01,-3.29063646e-03,-1.69211119e-01,-1.14617534e-01,5.59688732e-03,5.93355000e-02,-1.27704740e-01,-1.71358287e-01,-4.84642014e-02,-8.19769055e-02,2.84060407e-02,6.13150261e-02,-7.79468417e-02,-8.77461210e-03,-2.00844258e-01,-2.88251281e-01,-7.33745247e-02,-1.42669410e-01,1.07440352e-01,-1.39590308e-01,-3.51556130e-02,-4.18033963e-03,-1.82463229e-01,-4.28252965e-02,5.28394952e-02,1.75120696e-01,-9.33501031e-03,-3.33592743e-02,1.65851176e-01,1.39791211e-02,-1.52489260e-01,-6.68389164e-03,5.71185611e-02,2.38399506e-01,1.53594971e-01,7.59008080e-02,1.48483068e-02,-5.43878600e-02,1.36847854e-01,-1.76150039e-01,1.25447407e-01,1.70887619e-01,1.22895576e-01,5.84644414e-02,1.99920326e-01,-2.79710770e-01,1.56115033e-02,5.12041822e-02,-1.93132162e-01,1.51428387e-01,5.97179160e-02,-1.93341300e-02,-4.03094850e-03,1.73912272e-02,1.02863029e-01,-4.60668234e-03,-6.12722374e-02,-1.03243664e-01,1.96056634e-01,-1.93443596e-01,2.90273000e-02,9.11512822e-02,-3.45249921e-02,-1.79792568e-01,-2.18977749e-01,2.92301551e-02,3.94104689e-01,1.66036054e-01,-2.10731253e-01,4.83864099e-02,-4.31987755e-02,-9.82125998e-02,1.06999256e-01,1.90159921e-02,-5.58431894e-02,3.04446071e-02,-1.47668719e-01,8.35768692e-03,1.71920583e-01,7.69633651e-02,8.75835866e-02,1.86722219e-01,-2.75155809e-02,-1.05050392e-02,2.00979151e-02,-7.50234211e-03,-1.67125508e-01,2.20861211e-02,-4.32664342e-03,-5.50425760e-02,8.63447115e-02,-1.67248473e-01,1.38378460e-02,1.11343339e-01,-1.99985191e-01,1.35348290e-01,1.56460218e-02,2.73892656e-04,-6.41771033e-02,2.57192627e-02,-9.93981138e-02,8.97653773e-03,1.91183090e-01,-2.82200336e-01,2.23059848e-01,1.75120562e-01,-7.82503486e-02,1.47400096e-01,4.67997603e-02,7.76805580e-02,1.79661531e-02,-5.38391508e-02,-1.54771596e-01,-9.99689624e-02,-1.09263457e-01,-9.25640911e-02,1.83300804e-02,8.41395408e-02]],[[-1.50231764e-01,5.30236512e-02,5.80971278e-02,-6.91052619e-03,-6.63885847e-02,-8.69466662e-02,-1.51826143e-02,-5.16197905e-02,2.19310135e-01,-8.07677209e-02,1.71911135e-01,-3.65424380e-02,-1.77088380e-01,-9.78112444e-02,-1.38332583e-02,8.34669024e-02,-1.31156802e-01,-1.49645716e-01,-3.05147469e-02,-1.17407627e-01,1.71565767e-02,9.20448918e-03,-6.46030009e-02,-2.28046551e-02,-1.94293335e-01,-2.80386955e-01,-7.64302760e-02,-8.90514404e-02,1.17872708e-01,-9.60179269e-02,-3.07646766e-02,3.37364674e-02,-1.90276399e-01,-1.05832189e-01,6.49234205e-02,2.19782099e-01,-1.96797457e-02,1.40418569e-02,1.81732520e-01,-3.28570083e-02,-7.66380355e-02,6.89617405e-03,4.78702188e-02,2.45228872e-01,1.41428009e-01,1.00809440e-01,3.73133272e-03,-1.03467189e-01,8.70409757e-02,-2.12297142e-01,9.47272182e-02,1.90620258e-01,1.18681826e-01,3.31691504e-02,1.67793304e-01,-2.18925700e-01,-9.66489222e-03,1.24859490e-01,-1.71614006e-01,1.37775704e-01,8.33617598e-02,1.09298751e-02,-4.55547757e-02,-2.22153030e-02,1.64980054e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请求，该请求用于返回我的所有元素。但我似乎无法弄清楚如何按分组的数组（按名称和日期分组的）返回这些元素。

我的模型：

GET

这是我的 GET请求，用于返回所有元素：

public class Event
{
   [Key]
   public long ID { get; set; }

   [Required]
   public DateTime date { get; set; }

   [Required]
   public string name { get; set; }
}

解决方法

您可以这样定义DTO：

public class GroupedEventsDto
{
    public DateTime Date { get; set; }
    public string Name { get; set; }

    // although you already know date and name,// so you could have the list of IDs only
    public List<Event> Events { get; set; }
}

并简单地执行以下操作：

[HttpGet("api/events")]
public async Task<ActionResult<IEnumerable<GroupedEventsDto>>> GetEvents()
{
    var events = await context.Events.ToArrayAsync();

    var data = events 
       .GroupBy(x => new { x.date,x.name })
       .Select(grp => new GroupedEventsDto
       {
          Date = grp.Key.date,Name = grp.Key.name,Events = grp.ToList()
        })
        .ToList();

    return data;
}

这将生成类似JSON的

[
    {
        "Name": "a","Date": "2020-08-22","Events": [
            {
                "Name": "a","Id": 1
            },...
        ]
    },{
        "Name": "b","Events": [
            {
                "Name": "b","Id": 2
            },...
]

当然，您最终需要使用的属性将在GroupedEventsDto

中更改