interating over a collection in Blazor Server RSS

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  wavemaster

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  interating over a collection in Blazor Server

  Feb 28, 2021 09:51 PM|wavemaster|LINK

  private IEnumerable<RecordDetail> recordDetails = new List<RecordDetail>();
  
  recordDetails = await httpClient.GetFromJsonAsync<RecordDetail[]>($"{baseUrl}/api/Record/DetailByClient/22/49/3");

  recordDetails.Count() = 3

  In my UI I expected to do something along these lines:

  @foreach (var detail in recordDetails)
  {
     in here  detail.TransactionId and detail.Service
  
  
  }

  And since RecordDetail has a collection of ServiceItems, I was expecting to have another foreach to step through each ServiceItem.

  None of this seems to work, as detail.? has none of the properties I was expecting to see.

  Not understanding this.

  public class RecordDetail
      {
          public int TransactionId { get; set; }
          public string CName { get; set; }
          public string TDate { get; set; }
          public string BDate { get; set; }
          public string Initials { get; set; }
          public bool IsBilled { get; set; }
          public bool IsPaid { get; set; }
          public string SvcLevel { get; set; }
          
          public List<ServiceItem> ServiceItems { get; set; }
  
      }

  Click on "Mark as Answer" if my answers help you along.
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  bruce (sqlwo...

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  Re: interating over a collection in Blazor Server

  Mar 01, 2021 12:58 AM|bruce (sqlwork.com)|LINK

  I suspect the webapi you are calling does not return the nested results. 
  
  

  bruce (sqlwork.com)
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  wavemaster

  Contributor

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  2753 Posts

  Re: interating over a collection in Blazor Server

  Mar 01, 2021 03:15 AM|wavemaster|LINK

  I have removed the nested item from the controller and the model, just to keep things simple.

  Still the same issue. I cannot see what the Blazor server page sees.

  Only thing I am sure of what the controller does with a breakpoint sitting at return recordDetails;

  recordDetails
  Count = 3
      [0]: {BtApiEf5.Model.Custom.RecordDetail}
      [1]: {BtApiEf5.Model.Custom.RecordDetail}
      [2]: {BtApiEf5.Model.Custom.RecordDetail}
  recordDetails[0]
  {BtApiEf5.Model.Custom.RecordDetail}
      BDate: "May  9 2020  4:54PM"
      CName: "Jim"
      Initials: "JMC"
      IsBilled: false
      IsPaid: false
      SvcLevel: "R1"
      TDate: "May  9 2020  4:54PM"
      TransactionId: 1015

  I am in the dark what happens on the razor page, the only thing I can see at the breakpoint is recordDetails.Count() = 3

  Is this the correct return type?

  private IEnumerable<RecordDetail> recordDetails = new List<RecordDetail>();

  Click on "Mark as Answer" if my answers help you along.
• • Reply
  wavemaster

  Contributor

  2619 Points

  2753 Posts

  Re: interating over a collection in Blazor Server

  Mar 05, 2021 03:45 AM|wavemaster|LINK

  I have separated the data retrieval from the deserialization.

  Now I can confirm that the data makes it from the controller into JsonSerializer.Deserialize, but it doesn't produce the desired result.

  var json = JsonSerializer.Serialize(recordDetails);
              var content = new StringContent(json);
              string errorMessage = null;
              content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
              HttpResponseMessage response = await httpClient.GetAsync($"{baseUrl}/api/Record/DetailByClient/22/49/3");
              string dtls = await response.Content.ReadAsStringAsync();
                    
              if (dtls is not null)
              {
                  recordDetails = JsonSerializer.Deserialize(dtls, typeof(List<RecordDetail>)) as List<RecordDetail>;
              }
              else
              {
                  
              }

  dtls look like this:

  [{"TransactionId":1015,"CName":"Doolin","TDate":"May  9 2020  4:54PM","BDate":"May  9 2020  4:54PM","Initials":"JMC","IsBilled":false,"IsPaid":false,"SvcLevel":"R1"},{"TransactionId":988,"CName":"Doolin","TDate":"Jan 23 2020  3:13PM","BDate":"Mar 10 2020 11:17AM","Initials":"JMC","IsBilled":false,"IsPaid":false,"SvcLevel":"R1"},{"TransactionId":974,"CName":"Doolin","TDate":"Jan 22 2020  2:36PM","BDate":"Jan 22 2020  2:36PM","Initials":"JMC","IsBilled":false,"IsPaid":false,"SvcLevel":"R1"}]

  RecordDetail.cs is in the OP.

  I have looked up "deserialize not working" with suggestions to check the capitalization, which seems ok to me.

  Anything I need to look at?

  Click on "Mark as Answer" if my answers help you along.