Count parameter in Paging class seems to be incorrect

[SARM256]

Hello,
I used this code to for this sample:

app.MapGet("summeries", (string filter) =>
{
    var summaries = new[] { "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching" };
    var data = Enumerable.Range(1, 20).Select(index => new WeatherForecast
    {
        Date = DateTime.Now.AddDays(index),
        TemperatureC = Random.Shared.Next(-20, 55),
        Summary = summaries[Random.Shared.Next(summaries.Length)]
    });

    var gq = new GridifyQuery() { Filter = filter};

    return new { gq = data.AsQueryable().Gridify(gq), data };
});

and result was:

Collapsed due to long height

{
  "gq": {
    "count": 2,
    "data": [
      {
        "date": "2024-02-16T12:08:37.1401968+03:30",
        "temperatureC": -11,
        "temperatureF": 13,
        "summary": "Cool"
      },
      {
        "date": "2024-02-19T12:08:37.1402092+03:30",
        "temperatureC": 35,
        "temperatureF": 94,
        "summary": "Cool"
      },
      {
        "date": "2024-02-25T12:08:37.1402186+03:30",
        "temperatureC": 23,
        "temperatureF": 73,
        "summary": "Cool"
      }
    ]
  },
  "data": [
    {
      "date": "2024-02-15T12:08:37.1442944+03:30",
      "temperatureC": 37,
      "temperatureF": 98,
      "summary": "Balmy"
    },
    {
      "date": "2024-02-16T12:08:37.144311+03:30",
      "temperatureC": -1,
      "temperatureF": 31,
      "summary": "Balmy"
    },
    {
      "date": "2024-02-17T12:08:37.1443133+03:30",
      "temperatureC": -13,
      "temperatureF": 9,
      "summary": "Mild"
    },
    {
      "date": "2024-02-18T12:08:37.1443167+03:30",
      "temperatureC": 14,
      "temperatureF": 57,
      "summary": "Warm"
    },
    {
      "date": "2024-02-19T12:08:37.1443184+03:30",
      "temperatureC": 44,
      "temperatureF": 111,
      "summary": "Warm"
    },
    {
      "date": "2024-02-20T12:08:37.1443195+03:30",
      "temperatureC": -1,
      "temperatureF": 31,
      "summary": "Scorching"
    },
    {
      "date": "2024-02-21T12:08:37.1443228+03:30",
      "temperatureC": 48,
      "temperatureF": 118,
      "summary": "Freezing"
    },
    {
      "date": "2024-02-22T12:08:37.1443247+03:30",
      "temperatureC": 6,
      "temperatureF": 42,
      "summary": "Sweltering"
    },
    {
      "date": "2024-02-23T12:08:37.1443257+03:30",
      "temperatureC": -4,
      "temperatureF": 25,
      "summary": "Freezing"
    },
    {
      "date": "2024-02-24T12:08:37.1443266+03:30",
      "temperatureC": 52,
      "temperatureF": 125,
      "summary": "Sweltering"
    },
    {
      "date": "2024-02-25T12:08:37.1443282+03:30",
      "temperatureC": 32,
      "temperatureF": 89,
      "summary": "Bracing"
    },
    {
      "date": "2024-02-26T12:08:37.1443378+03:30",
      "temperatureC": 3,
      "temperatureF": 37,
      "summary": "Balmy"
    },
    {
      "date": "2024-02-27T12:08:37.1443509+03:30",
      "temperatureC": 23,
      "temperatureF": 73,
      "summary": "Warm"
    },
    {
      "date": "2024-02-28T12:08:37.1443521+03:30",
      "temperatureC": 5,
      "temperatureF": 40,
      "summary": "Scorching"
    },
    {
      "date": "2024-02-29T12:08:37.144353+03:30",
      "temperatureC": 30,
      "temperatureF": 85,
      "summary": "Hot"
    },
    {
      "date": "2024-03-01T12:08:37.1443539+03:30",
      "temperatureC": 24,
      "temperatureF": 75,
      "summary": "Bracing"
    },
    {
      "date": "2024-03-02T12:08:37.1443549+03:30",
      "temperatureC": -19,
      "temperatureF": -2,
      "summary": "Hot"
    },
    {
      "date": "2024-03-03T12:08:37.1443559+03:30",
      "temperatureC": 16,
      "temperatureF": 60,
      "summary": "Scorching"
    },
    {
      "date": "2024-03-04T12:08:37.1443571+03:30",
      "temperatureC": 1,
      "temperatureF": 33,
      "summary": "Scorching"
    },
    {
      "date": "2024-03-05T12:08:37.144358+03:30",
      "temperatureC": -3,
      "temperatureF": 27,
      "summary": "Cool"
    }
  ]
}

As you can see, Gridify found 3 objects but returned 2 in the count parameter.
Does the count represent something other than the length of the data?

[alirezanet]

Hi @SARM256,
I think this is happening because you're using runtime random generated data and this code is being evaluated twice. please add ToList at the end of your data generation logic and test it again to make sure you have a consistent data source.

[SARM256]

yes you were right,
random data caused this happening.
adding .ToList() fixed it.

    var data = Enumerable.Range(1, 20).Select(index => new WeatherForecast
    {
        Date = DateTime.Now.AddDays(index),
        TemperatureC = Random.Shared.Next(-20, 55),
        Summary = summaries[Random.Shared.Next(summaries.Length)]
    }).ToList();