如何通过 C# 使用 Fhir R4 添加遭遇

Question

我试过添加新遭遇，但它显示“System.NullReferenceException：'Object reference not set to an instance of an object'”。这是我的代码：

private static void AddEncounter()
    {
        
        var encount = new Encounter();
        
        encount.Identifier.Add(new Identifier
        {
            Use = (Identifier.IdentifierUse?)1,
            System = "http://www.amc.nl/zorgportal/identifiers/visits",
            Value = "tek001"

        }) ;
        encount.Class = new Coding("http://terminology.hl7.org/CodeSystem/v3-ActCode", "SS", "Lưu trú ngắn hạn");
        encount.Status = 0;
        encount.Priority = new CodeableConcept("http://terminology.hl7.org/CodeSystem/v3-ActPriority", "R", "routine");
        encount.Subject = new ResourceReference("Patient/a07b880381ec44ad8f80743f396c8011/_history/1", "Lâm");

        encount.Length.Value = 120;
        encount.Length.Unit = "min";
        encount.Length.System = "http://unitsofmeasure.org";
        encount.Length.Code = "min";
        encount.ReasonCode.Add(new CodeableConcept("http://snomed.info/sct", "184004", "Rối loạn nhịp tim rút"));

        
        encount.Hospitalization.PreAdmissionIdentifier.Use = (Identifier.IdentifierUse?)1;
        encount.Hospitalization.PreAdmissionIdentifier.System = "http://www.amc.nl/zorgportal/identifiers/pre-admissions";
        encount.Hospitalization.PreAdmissionIdentifier.Value = "1598753";
        encount.Hospitalization.AdmitSource = new CodeableConcept("http://terminology.hl7.org/CodeSystem/admit-source", "outp", "Khoa ngoại trú");
        encount.Hospitalization.DischargeDisposition = new CodeableConcept("http://terminology.hl7.org/CodeSystem/discharge-disposition", "hosp", "Bệnh nhân đã được xuất viện và chăm sóc giảm nhẹ");


        Console.WriteLine("Successful");
        Console.ReadLine();
    }

我怎样才能准确添加一个？

Answer 1

如果没有看到整个 class 很难确定，但是在尝试访问尚未实例化的内容时会抛出 System.NullReferenceException。

encount.Hospitalization 可能是对另一个必须首先实例化的 class 的引用。 尝试在访问之前先创建和实例（下面的示例）。

encount.Length = new Length();
encount.Hospitalization = new Hospitalization();

注意：我猜是 class 名称（Length 和 Hospitalization），因此您可能需要针对您的代码进行调整.主要思想是您必须在 utilizing\accessing.

之前创建 class (new ...())

Answer 2

就像您为标识符字段创建标识符以及为 Class、优先级和主题字段创建其他复杂对象一样，您需要为长度字段创建持续时间：

encount.Length = new Duration();
encount.Length.Value = 120;
// etc.

您必须对您在代码中使用的所有复杂对象执行此操作，因此对于 Hospitalization 字段和 PreAdmissionIdentifier：

encount.Hospitalization = new Encounter.HospitalizationComponent();
encount.Hospitalization.PreAdmissionIdentifier = new Identifier();
// etc.

我想建议的另一项更改是使用枚举中提供的值作为标识符使用，使您的代码更具可读性并明确您的意图：

encount.Hospitalization.PreAdmissionIdentifier.Use = Identifier.IdentifierUse.Official;

如何通过 C# 使用 Fhir R4 添加遭遇

How to add encounter using Fhir R4 by c#

c#

hl7-fhir