HL7 2.X解析(C#版)
Hl7引擎的目标主要是解决将数据按HL7协议的要求标准化，和标准业务的集成和不同系统间标准业务数据的同步。在多年的医院集成平台信息化过程中，HL7标准组织和解析最复杂了，下面是我用了多年HL7引擎解析，因公司升级使用了HL73.0版本，决定把HL72.X引擎放到博客上保存。
（引擎解析类）Decode.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Text.RegularExpressions;
namespace com.china.hl7
{
/// <summary>
/// HL7解析器
/// </summary>
public static class HL7ToXmlConverter
{
private static XmlDocument _xmlDoc;
/// <summary>
/// 把HL7信息转成XML形式
/// 分隔顺序 \n,|,~,^,&
/// </summary>
/// <param name="sHL7">HL7字符串</param>
/// <returns></returns>
public static string ConvertToXml(string sHL7)
{
_xmlDoc = ConvertToXmlObject(sHL7);
return _xmlDoc.OuterXml;
}
public static XmlDocument ConvertToXmlObject(string sHL7)
{
_xmlDoc = CreateXmlDoc();
//把HL7分成段
string[] sHL7Lines = sHL7.Split('\n');
//去掉XML的关键字
for (int i = 0; i < sHL7Lines.Length; i++)
{
sHL7Lines[i] = Regex.Replace(sHL7Lines[i], @"[^ -~]", "");
}
for (int i = 0; i < sHL7Lines.Length; i++)
{
// 判断是否空行
if (sHL7Lines[i] != string.Empty)
{
string sHL7Line = sHL7Lines[i];
//通过/r 或/n 回车符分隔
string[] sFields = HL7ToXmlConverter.GetMessgeFields(sHL7Line);
// 为段（一行）创建第一级节点
XmlElement el = _xmlDoc.CreateElement(sFields[0]);
_xmlDoc.DocumentElement.AppendChild(el);
// 循环每一行
for (int a = 0; a < sFields.Length; a++)
{
// 为字段创建第二级节点
XmlElement fieldEl = _xmlDoc.CreateElement(sFields[0] + "." + a.ToString());
//是否包括HL7的连接符
if (sFields[a] != @"^~\&")
{//0:如果这一行有任何分隔符
//通过~分隔
string[] sComponents = HL7ToXmlConverter.GetRepetitions(sFields[a]);
if (sComponents.Length > 1)
{//1:如果可以分隔
for (int b = 0; b < sComponents.Length; b++)
{
XmlElement componentEl = _xmlDoc.CreateElement(sFields[0] + "." + a.ToString() + "." + b.ToString());
//通过&分隔
string[] subComponents = GetSubComponents(sComponents[b]);
if (subComponents.Length > 1)
{//2.如果有字组，一般是没有的。。。
for (int c = 0; c < subComponents.Length; c++)
{
//修改了一个错误
string[] subComponentRepetitions = GetComponents(subComponents[c]);
if (subComponentRepetitions.Length > 1)
{
for (int d = 0; d < subComponentRepetitions.Length; d++)
{
XmlElement subComponentRepEl = _xmlDoc.CreateElement(sFields[0] + "." + a.ToString() + "." + b.ToString() + "." + c.ToString() + "." + d.ToString());
subComponentRepEl.InnerText = subComponentRepetitions[d];
componentEl.AppendChild(subComponentRepEl);
}
}
else
{
XmlElement subComponentEl = _xmlDoc.CreateElement(sFields[0] + "." + a.ToString() + "." + b.ToString() + "." + c.ToString());
subComponentEl.InnerText = subComponents[c];
componentEl.AppendChild(subComponentEl);
}
}
fieldEl.AppendChild(componentEl);
}
else
{//2.如果没有字组了，一般是没有的。。。
string[] sRepetitions = HL7ToXmlConverter.GetComponents(sComponents[b]);
if (sRepetitions.Length > 1)
{
XmlElement repetitionEl = null;
for (int c = 0; c < sRepetitions.Length; c++)
{
repetitionEl = _xmlDoc.CreateElement(sFields[0] + "." + a.ToString() + "." + b.ToString() + "." + c.ToString());
repetitionEl.InnerText = sRepetitions[c];
componentEl.AppendChild(repetitionEl);
}
fieldEl.AppendChild(componentEl);
el.AppendChild(fieldEl);
}
else
{
componentEl.InnerText = sComponents[b];
fieldEl.AppendChild(componentEl);
el.AppendChild(fieldEl);
}
}
}
el.AppendChild(fieldEl);
}
else
{//1:如果不可以分隔，可以直接写节点值了。
fieldEl.InnerText = sFields[a];
el.AppendChild(fieldEl);
}
}
else
{//0:如果不可以分隔，可以直接写节点值了。
fieldEl.InnerText = sFields[a];
el.AppendChild(fieldEl);
}
}
}
}
return _xmlDoc;
}
/// <summary>
/// 通过|分隔 字段
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
private static string[] GetMessgeFields(string s)
{
return s.Split('|');
}
/// <summary>
/// 通过^分隔 组字段
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
private static string[] GetComponents(string s)
{
return s.Split('^');
}
/// <summary>
/// 通过&分隔 子分组组字段
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
private static string[] GetSubComponents(string s)
{
return s.Split('&');
}
/// <summary>
/// 通过~分隔 重复
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
private static string[] GetRepetitions(string s)
{
return s.Split('~');
}
/// <summary>
/// 创建XML对象
/// </summary>
/// <returns></returns>
private static XmlDocument CreateXmlDoc()
{
XmlDocument output = new XmlDocument();
XmlElement rootNode = output.CreateElement("HL7Message");
output.AppendChild(rootNode);
return output;
}
public static string GetText(XmlDocument xmlObject, string path)
{
XmlNode node = xmlObject.DocumentElement.SelectSingleNode(path);
if (node != null)
{
return node.InnerText;
}
else
{
return null;
}
}
public static string GetText(XmlDocument xmlObject, string path, int index)
{
XmlNodeList nodes = xmlObject.DocumentElement.SelectNodes(path);
if (index <= nodes.Count)
{
return nodes[index].InnerText;
}
else
{
return null;
}
}
public static String[] GetTexts(XmlDocument xmlObject, string path)
{
XmlNodeList nodes = xmlObject.DocumentElement.SelectNodes(path);
String[] arr = new String[nodes.Count];
int index = 0;
foreach (XmlNode node in nodes)
{
arr[index++] = node.InnerText;
}
return arr;
}
}
}
测试方法：
String myHL7string = "MSH|^~\\&|455755610_0100||0200||20110624160404|000|QRY^A19^QRY_A19|0123456001|P|2.6\nQRD|||||||||0001^郭靖^体检号^EQ^AND~0002^东一区^病区号^EQ^AND\nQRF||20110627|20110803";
string sHL7asXml = HL7ToXmlConverter.ConvertToXml(myHL7string);
XmlDocument xmlObject = HL7ToXmlConverter.ConvertToXmlObject(myHL7string);
String value = HL7ToXmlConverter.GetText(xmlObject, "QRD/QRD.9/QRD.9.0",0);
String value2 = HL7ToXmlConverter.GetText(xmlObject, "QRD/QRD.9/QRD.9.0");
String nodeValue = xmlObject.DocumentElement.SelectSingleNode("MSH/MSH.1").InnerText;
String nodeValue2 = xmlObject.DocumentElement.SelectSingleNode("QRD/QRD.9/QRD.9.0").InnerText;