消息验证抛出“未找到消息”异常

Question

我正在使用 hl7-dotnetcore 包来创建新的 HL7 消息。创建它们后，我想将其中一些序列化为字符串，将其中一些序列化为字节。我使用以下代码段创建了一个空的 .NET Core 控制台项目

internal class Program
{
    private static void Main(string[] args)
    {
        Message mdmMessage = new Message();

        mdmMessage.AddSegmentMSH(
            "sendingApplication",
            "sendingFacility",
            "receivingApplication",
            "receivingFacility",
            string.Empty,
            "MDM^T02",
            $"Id{DateTime.Now.Ticks}",
            "P",
            "2.6");

        HL7Encoding hl7Encoding = new HL7Encoding();

        //################################
        // Add a field e.g. TXA.1

        Segment txaSegment = new Segment("TXA", hl7Encoding);
        txaSegment.AddNewField("1", 1);
        mdmMessage.AddNewSegment(txaSegment);

        //################################
        // Add a component field e.g. PID.5.1

        Segment pidSegment = new Segment("PID", hl7Encoding);
        Field patientNameField = new Field(hl7Encoding);
        Component pidFamilyNameComponent = new Component("Doe", hl7Encoding);
        patientNameField.AddNewComponent(pidFamilyNameComponent, 1);
        pidSegment.AddNewField(patientNameField, 5);
        mdmMessage.AddNewSegment(pidSegment);

        try
        {
            string messageString = mdmMessage.SerializeMessage(true); // This will throw an exception
        }
        catch (Exception exception)
        {
            Console.WriteLine($"Serialization failed:{Environment.NewLine}{exception.Message}");
        }

        try
        {
            byte[] messageBytes = mdmMessage.GetMLLP(true); // This will throw an exception
        }
        catch (Exception exception)
        {
            Console.WriteLine($"Conversion failed:{Environment.NewLine}{exception.Message}");
        }

        Console.ReadLine();
    }
}

不幸的是，我有两个例外

“无法验证消息，错误 - 未找到消息”

有人知道我在这里缺少什么吗？