XsdGen:通过自定义Attribute与反射自动生成XSD
前言
系统之间的数据交互往往需要事先定义一些契约,在WCF中我们需要先编写XSD文件,然后通过自动代码生成工具自动生成C#对象。对于刚刚接触契约的人来说,掌握XMLSpy之类的软件之后确实比手写XML效率要高,但还是有些学习成本的。此外XML的tag太多,如果设计的类型属性过多,手写XSD也不太现实,很难专注于设计。
于是我想能不能先用C#写好类型,然后自动生成标准格式的XSD呢。经过三天左右的设计和实现,目前实现了以下功能:
1. 支持Class和Enum类型的设计
2. 支持基元类型、自定义类型、泛型列表、自定义类型数组等属性
3. 支持自定义类型之间的依赖关系
4. 支持契约分组(指定Request/Response分到同一个xsd文件)
5. 支持契约汇总(对于自定义类型,最终体现在一个汇总xsd文件中,并自动引用其它xsd文件)
开源地址:https://github.com/CreateChen/XsdGen。我刚接触SOA不久,目前只添加了xsd的minOccurs、maxOccurs等基本属性,对于其它属性并没有全部集成进去,集成方式也非常简单,在Attribute中添加相应的属性,并在XsdBuilder.cs中添加相应的处理。
效果
先看一下实现的效果,例如我定义了以下类型:FoodOrderRequest、FoodOrderResponse、PayType
using System; using System.Collections.Generic; using XsdAttribute; [assembly: XsdSchema( TargetNamespace = "http://xx.com/framework/soa/sample/v1", XmlNamespace = "http://xx.com/framework/soa/sample/v1", Namespace = "http://xx.com/framework/soa/sample/v1", Common = "http://xx.com/common/types/v1")] [assembly: XsdImport(Id = "SOACommonTypes", Namespace = "http://xx.com/common/types/v1", SchemaLocation = "SOACommonTypes_V1.0.0.xsd")] namespace TestDLL { [XsdComplexType(Annotation = "订餐申请", FileGroup = "FoodOrder")] public class FoodOrderRequest { [XsdElement(MinOccurs = "1", Annotation = "餐馆编号")] public int RestaurantId { get; set; } [XsdElement(MinOccurs = "1", Annotation = "餐馆名称")] public string RestaurantName { get; set; } [XsdElement(Annotation = "订餐日期")] public DateTime OrderDate { get; set; } [XsdElement(MinOccurs = "0", MaxOccurs = "unbounded", Annotation = "食品编号")] public List<int> FoodId { get; set; } [XsdElement(MinOccurs = "1", Annotation = "业务类型")] public PayType BusinessType { get; set; } } [XsdComplexType(Annotation = "订餐结果", FileGroup = "FoodOrder")] public class FoodOrderResponse { [XsdElement(MinOccurs = "1", Annotation = "订单编号")] public int OrderId { get; set; } [XsdElement(Annotation = "预计送达时间")] public DateTime DeliveryTime { get; set; } } [XsdSimpleType(Annotation = "付款类型", FileGroup = "PayType")] public enum PayType { 现金, 支付宝, 微信, 网银 } }
工具自动为我生成了3个文件:
FoodOrder.xsd
<?xml version="1.0" encoding="utf-8"?> <xs:schema id="FoodOrder" targetNamespace="http://xx.com/framework/soa/sample/v1" elementFormDefault="qualified" attributeFormDefault="unqualified" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://xx.com/framework/soa/sample/v1" xmlns:ns="http://xx.com/framework/soa/sample/v1" xmlns:common="http://xx.com/common/types/v1"> <xs:include schemaLocation="PayType.xsd" /> <xs:import id="SOACommonTypes" schemaLocation="SOACommonTypes_V1.0.0.xsd" namespace="http://xx.com/common/types/v1" /> <xs:complexType name="FoodOrderRequestType"> <xs:annotation> <xs:documentation>订餐申请</xs:documentation> </xs:annotation> <xs:sequence> <xs:element name="RestaurantId" type="xs:int" minOccurs="1"> <xs:annotation> <xs:documentation>餐馆编号</xs:documentation> </xs:annotation> </xs:element> <xs:element name="RestaurantName" type="xs:string" minOccurs="1"> <xs:annotation> <xs:documentation>餐馆名称</xs:documentation> </xs:annotation> </xs:element> <xs:element name="OrderDate" type="xs:dateTime"> <xs:annotation> <xs:documentation>订餐日期</xs:documentation> </xs:annotation> </xs:element> <xs:element name="FoodId" type="xs:int" minOccurs="0" maxOccurs="unbounded"> <xs:annotation> <xs:documentation>食品编号</xs:documentation> </xs:annotation> </xs:element> <xs:element name="BusinessType" type="PayType" minOccurs="1"> <xs:annotation> <xs:documentation>业务类型</xs:documentation> </xs:annotation> </xs:element> </xs:sequence> </xs:complexType> <xs:complexType name="FoodOrderResponseType"> <xs:annotation> <xs:documentation>订餐结果</xs:documentation> </xs:annotation> <xs:sequence> <xs:element name="OrderId" type="xs:int" minOccurs="1"> <xs:annotation> <xs:documentation>订单编号</xs:documentation> </xs:annotation> </xs:element> <xs:element name="DeliveryTime" type="xs:dateTime"> <xs:annotation> <xs:documentation>预计送达时间</xs:documentation> </xs:annotation> </xs:element> </xs:sequence> </xs:complexType> </xs:schema>
PayType.xsd
<?xml version="1.0" encoding="utf-8"?> <xs:schema id="PayType" targetNamespace="http://xx.com/framework/soa/sample/v1" elementFormDefault="qualified" attributeFormDefault="unqualified" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://xx.com/framework/soa/sample/v1" xmlns:ns="http://xx.com/framework/soa/sample/v1" xmlns:common="http://xx.com/common/types/v1"> <xs:import id="SOACommonTypes" schemaLocation="SOACommonTypes_V1.0.0.xsd" namespace="http://xx.com/common/types/v1" /> <xs:simpleType name="PayType" final="restriction"> <xs:restriction base="xs:string"> <xs:enumeration value="现金" /> <xs:enumeration value="支付宝" /> <xs:enumeration value="微信" /> <xs:enumeration value="网银" /> </xs:restriction> </xs:simpleType> </xs:schema>
TestDLL.xsd
<?xml version="1.0" encoding="utf-8"?> <xs:schema id="TestDLL" targetNamespace="http://xx.com/framework/soa/sample/v1" elementFormDefault="qualified" attributeFormDefault="unqualified" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://xx.com/framework/soa/sample/v1" xmlns:ns="http://xx.com/framework/soa/sample/v1" xmlns:common="http://xx.com/common/types/v1"> <xs:import id="SOACommonTypes" schemaLocation="SOACommonTypes_V1.0.0.xsd" namespace="http://xx.com/common/types/v1" /> <xs:include schemaLocation="FoodOrder.xsd" /> <xs:include schemaLocation="PayType.xsd" /> <xs:element name="FoodOrderRequest" nillable="true" type="ns:FoodOrderRequestType" /> <xs:element name="FoodOrderResponse" nillable="true" type="ns:FoodOrderResponseType" /> </xs:schema>
自定义Attribute
1. Assembly的Attribute
[AttributeUsage(AttributeTargets.Assembly)] public class XsdSchema : Attribute { public string TargetNamespace { get; set; } public string XmlNamespace { get; set; } public string Namespace { get; set; } public string Common { get; set; } //汇总dll中的类型,生成总的xsd private string _packageId; /// <summary> /// 生成XSD的文件名称 /// </summary> public string PackageId { get { return _packageId; } set { //去除文件名中非法字符 var regex = new Regex(@"\:|\;|\/|\\|\||\,|\*|\?|\""|\<|\>"); _packageId = regex.Replace(value, ""); } } public static XsdSchema Get(Assembly assembly) { return (XsdSchema) GetCustomAttribute(assembly, typeof (XsdSchema)); } }
前几个是一些命名空间的定义,可以根据自己公司的业务规则进行设计。默认情况下,汇总文件的targetId、文件名称以及生成的文件夹名称都是PackageId决定,如果dll没有指定该值,默认则是dll的Name。
除了定义Schema,每个xsd文件中可能还需要导入一些默认的公共类型,在这种情况下,可以为assembly添加如下Attribute:
[AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)] public class XsdImport : Attribute { public string Id { get; set; } public string SchemaLocation { get; set; } public string Namespace { get; set; } public static IEnumerable<XsdImport> Get(Assembly assembly) { var attributes = GetCustomAttributes(assembly, typeof (XsdImport)); return attributes.Cast<XsdImport>(); } }
2. Class类型的Attribute
[AttributeUsage((AttributeTargets.Class))] public class XsdComplexType : Attribute { private string _fileGroup; /// <summary> /// 生成XSD的文件名称 /// </summary> public string FileGroup { get { return _fileGroup; } set { //去除文件名中非法字符 var regex = new Regex(@"\:|\;|\/|\\|\||\,|\*|\?|\""|\<|\>"); _fileGroup = regex.Replace(value, ""); } } public string Annotation { get; set; } public static XsdComplexType Get(Type type) { return (XsdComplexType) GetCustomAttribute(type, typeof (XsdComplexType)); } }
其中必须指定FileGroup值,相同的FileGroup值,最后会生成到同一个xsd文件中。
2. Property的Attribute
[AttributeUsage((AttributeTargets.Property))] public class XsdElement : Attribute { public string MinOccurs { get; set; } public string MaxOccurs { get; set; } public string Annotation { get; set; } public static XsdElement Get(PropertyInfo propertyInfo) { return (XsdElement) GetCustomAttribute(propertyInfo, typeof (XsdElement)); } }
如果自定义类型的属性是List或者Array,要将MaxOccurs设为大于0的数或者unbounded。
3. Enum类型的Attribute
[AttributeUsage((AttributeTargets.Enum))] public class XsdSimpleType : Attribute { private string _fileGroup; /// <summary> /// 生成XSD的文件名称 /// </summary> public string FileGroup { get { return _fileGroup; } set { //去除文件名中非法字符 var regex = new Regex(@"\:|\;|\/|\\|\||\,|\*|\?|\""|\<|\>"); _fileGroup = regex.Replace(value, ""); } } public string Annotation { get; set; } public static XsdSimpleType Get(Type type) { return (XsdSimpleType) GetCustomAttribute(type, typeof (XsdSimpleType)); } }
与XsdComplexType类似,相同的FileGroup类型,最后都归到同一个xsd文件中。
反射DLL并生成XSD
1. XsdFile结构定义
public class XsdFile { public XsdFile() { Imports = new List<XElement>(); Elements = new List<XElement>(); } public XElement Schema { get; set; } /// <summary> /// <para>Assembly级别的Import</para> /// <para>自定义复合对象的Import</para> /// </summary> public List<XElement> Imports { get; set; } /// <summary> /// <para>自定义Class类型</para> /// <para>自定义枚举类型</para> /// </summary> public List<XElement> Elements { get; set; } public XElement ToXML() { foreach (var import in Imports) { Schema.Add(import); } foreach (var element in Elements) { Schema.Add(element); } return Schema; } }
基本思路是Schema添加所有的Import和Element,最后生成XML。
2. XsdBuilder
using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Reflection; using System.Xml.Linq; using XsdAttribute; namespace XsdGen { public class XsdBuilder { private readonly XNamespace _xs = "http://www.w3.org/2001/XMLSchema"; private Assembly _assembly; //Key:FileGroup, Value:对应的XsdFile private Dictionary<string, XsdFile> _xsdFiles; //自定义Class对象的声明,用于生成汇总xsd private List<XElement> _elements; public void Build(Assembly assembly) { _assembly = assembly; _xsdFiles = new Dictionary<string, XsdFile>(); _elements = new List<XElement>(); XElement[] defaultImports = GetDefaultImports(_assembly).ToArray(); XsdSchema defaultSchema = XsdSchema.Get(_assembly); string directoryName = defaultSchema.PackageId ?? _assembly.GetName().Name; if (!Directory.Exists(directoryName)) { Directory.CreateDirectory(directoryName); } BuildTypes(_assembly); foreach (var item in _xsdFiles) { item.Value.Schema = GetSchema(defaultSchema, item.Key); foreach (var import in defaultImports) { item.Value.Imports.Add(import); } //生成XSD文件 string fileName = string.Format("{0}/{1}.xsd", directoryName, item.Key); item.Value.ToXML().Save(fileName); Console.WriteLine("Generate {0}", fileName); } //生成汇总XSD文件 var summaryXsdFile = BuildSummary(defaultSchema, defaultImports, directoryName); string summaryXsdFileName = string.Format("{0}/{1}.xsd", directoryName, directoryName); summaryXsdFile.ToXML().Save(summaryXsdFileName); Console.WriteLine("{0}Generate Summary{0}\n{1}", new String('=', 10), summaryXsdFileName); } private XElement GetSchema(XsdSchema xsdSchema, string id) { var schema = new XElement( _xs + "schema", new XAttribute("id", id), new XAttribute("targetNamespace", xsdSchema.TargetNamespace), new XAttribute("elementFormDefault", "qualified"), new XAttribute("attributeFormDefault", "unqualified"), new XAttribute(XNamespace.Xmlns + "xs", _xs.ToString()) ); if (!string.IsNullOrEmpty(xsdSchema.XmlNamespace)) schema.SetAttributeValue("xmlns", xsdSchema.XmlNamespace); if (!string.IsNullOrEmpty(xsdSchema.Namespace)) schema.SetAttributeValue(XNamespace.Xmlns + "ns", xsdSchema.Namespace); if (!string.IsNullOrEmpty(xsdSchema.Common)) schema.SetAttributeValue(XNamespace.Xmlns + "common", xsdSchema.Common); return schema; } private IEnumerable<XElement> GetDefaultImports(Assembly assembly) { var xsdImports = XsdImport.Get(assembly); return xsdImports.Select(xsdImport => new XElement( _xs + "import", new XAttribute("id", xsdImport.Id), new XAttribute("schemaLocation", xsdImport.SchemaLocation), new XAttribute("namespace", xsdImport.Namespace) )); } private void BuildTypes(Assembly assembly) { var types = assembly.GetTypes(); foreach (var type in types) { string fileGroup; if (type.IsClass) { var element = BuildElement(type); _elements.Add(element); //_xsdFiles[fileGroup].Elements.Add(element); var complexTypeElement = BuildComplexType(type, out fileGroup); _xsdFiles[fileGroup].Elements.Add(complexTypeElement); } else if (type.IsEnum) { var simpleTypeElement = BuildSimpleType(type, out fileGroup); _xsdFiles[fileGroup].Elements.Add(simpleTypeElement); } } } public XElement BuildElement(Type type) { //只有Request或者Response对象类型,末尾自动添加Type string name = (type.Name.EndsWith("Request") || type.Name.EndsWith("Response")) ? type.Name + "Type" : type.Name; return new XElement( _xs + "element", new XAttribute("name", type.Name), new XAttribute("nillable", true), new XAttribute("type", "ns:" + name) ); } private XElement BuildComplexType(Type type, out string fileGroup) { var xsdComplexType = XsdComplexType.Get(type); //添加XSD文件 fileGroup = xsdComplexType.FileGroup; SetDefaultFile(fileGroup); //只有Request或者Response对象类型,末尾自动添加Type string name = (type.Name.EndsWith("Request") || type.Name.EndsWith("Response")) ? type.Name + "Type" : type.Name; var complexTypeElement = new XElement( _xs + "complexType", new XAttribute("name", name) ); if (!string.IsNullOrEmpty(xsdComplexType.Annotation)) { complexTypeElement.Add(new XElement( _xs + "annotation", new XElement(_xs + "documentation", xsdComplexType.Annotation) )); } var sequenceElement = BuildSequence(type); AddProperties(type, sequenceElement); complexTypeElement.Add(sequenceElement); return complexTypeElement; } private XElement BuildSequence(Type type) { var sequence = new XElement(_xs + "sequence");return sequence; } private XsdFile BuildSummary(XsdSchema defaultSchema, XElement[] defaultImports, string packageId) { XsdFile xsdFile = new XsdFile(); xsdFile.Schema = GetSchema(defaultSchema, packageId); foreach (var import in defaultImports) { xsdFile.Imports.Add(import); } //include所有其它自动生成的xsd文件 foreach (var item in _xsdFiles) { xsdFile.Imports.Add(new XElement( _xs + "include", new XAttribute("schemaLocation", item.Key + ".xsd") )); } //添加dll中所有定义的element foreach (var item in _elements) { xsdFile.Elements.Add(item); } return xsdFile; } private void AddProperties(Type type, XElement sequenceElement) { var properties = type.GetProperties(); foreach (var propertyInfo in properties) { var typeName = Common.GetXsdTypeName(propertyInfo.PropertyType); var propertyElement = new XElement( _xs + "element", new XAttribute("name", propertyInfo.Name), new XAttribute("type", typeName) ); var xsdElement = XsdElement.Get(propertyInfo); if (xsdElement != null) { if (!string.IsNullOrEmpty(xsdElement.MinOccurs)) propertyElement.SetAttributeValue("minOccurs", xsdElement.MinOccurs); if (!string.IsNullOrEmpty(xsdElement.MaxOccurs)) propertyElement.SetAttributeValue("maxOccurs", xsdElement.MaxOccurs); if (!string.IsNullOrEmpty(xsdElement.Annotation)) propertyElement.Add(new XElement( _xs + "annotation", new XElement( _xs + "documentation", xsdElement.Annotation ) )); } //判断是否自定义类型, 添加Import if (!typeName.StartsWith("xs:")) { var parentClassFileGroup = XsdComplexType.Get(type).FileGroup; var propertyClassFileGroup = Common.GetFileGroup(propertyInfo.PropertyType); if (parentClassFileGroup != propertyClassFileGroup) { string importXsd = propertyClassFileGroup + ".xsd"; //判断是否已经存在该Import if (_xsdFiles[parentClassFileGroup].Imports.All(item => item.Attribute("schemaLocation").Value != importXsd)) { _xsdFiles[parentClassFileGroup].Imports.Add( new XElement( _xs + "include", new XAttribute("schemaLocation", importXsd) ) ); } } } sequenceElement.Add(propertyElement); } } private XElement BuildSimpleType(Type type, out string fileGroup) { var xsdSimpleType = XsdSimpleType.Get(type); //添加XSD文件 fileGroup = xsdSimpleType.FileGroup; SetDefaultFile(fileGroup); var simpleTypeElement = new XElement( _xs + "simpleType", new XAttribute("name", type.Name), new XAttribute("final", "restriction") ); var restrictionElement = new XElement( _xs + "restriction", new XAttribute("base", "xs:string") ); foreach (var val in Enum.GetNames(type)) { restrictionElement.Add( new XElement( _xs + "enumeration", new XAttribute("value", val) ) ); } simpleTypeElement.Add(restrictionElement); return simpleTypeElement; } private void SetDefaultFile(string fileGroup) { if (!_xsdFiles.ContainsKey(fileGroup)) { var xsdFile = new XsdFile(); _xsdFiles[fileGroup] = xsdFile; } } } }
XsdBuilder依次反射出Assembly、Class、Enum、Property的自定义Attribute,根据XSD的规则构造XElement。主要步骤在Builder函数中都有所体现。
应用
现在写接口契约就很爽了,只要定义好类生成DLL,通过XsdGen.exe就可轻松生成接口契约
参考
http://www.codeproject.com/Articles/2933/Attributes-in-C
https://msdn.microsoft.com/en-us/library/84c42s56%28v=vs.110%29.aspx
https://msdn.microsoft.com/en-us/library/aa719879(v=vs.71).aspx
https://msdn.microsoft.com/en-us/library/y1375e30%28v=vs.110%29.aspx
http://stackoverflow.com/questions/1936953/custom-assembly-attributes
http://stackoverflow.com/questions/1168532/xsd-definition-for-enumerated-value
作者:Create Chen
出处:http://technology.cnblogs.com
说明:文章为作者平时里的思考和练习,可能有不当之处,请博客园的园友们多提宝贵意见。
本作品采用知识共享署名-非商业性使用-相同方式共享 2.5 中国大陆许可协议进行许可。