ASP.NET2.0WebService中传递DataTable参考

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　　在2.0正式版发布之前，就满天的看到关于DataTable支持序列化的新特性宣传，满以为从此以后使用DataTable就和DataSet一样方便了，结果在应用项目的时候才发现并非那么回事。
　　DataTable是支持序列化了，但是微软并没有把他做的特别方便，还需要我们自己来做一些工作之后才能够在WebService里面传递DataTable，否则在引用DataTable的时候会发现DataTable变成了一个什么Proxy类型。
　　首先编写类DataTableSchemaImporterExtension，代码如下：
using System;
using System.Collections.Generic;
using System.Text;
using System.Xml.Serialization.Advanced;
using System.Collections;
using System.Xml.Schema;
using System.Xml.Serialization;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Xml;
using System.Data;

namespace Xrinehart.Tools.WebService.SchemaImporter
{
class DataTableSchemaImporterExtension : SchemaImporterExtension
{

// DataTableSchemaImporterExtension is used for WebServices, it is used to recognize the schema for DataTable within wsdl

Hashtable importedTypes = new Hashtable();

public override string ImportSchemaType(string name, string schemaNamespace, XmlSchemaObject context, XmlSchemas schemas, XmlSchemaImporter importer, CodeCompileUnit compileUnit, CodeNamespace mainNamespace, CodeGenerationOptions options, CodeDomProvider codeProvider)
{

IList values = schemas.GetSchemas(schemaNamespace);

if (values.Count != 1)
{

return null;

}

XmlSchema schema = values[0] as XmlSchema;

if (schema == null)

return null;

XmlSchemaType type = (XmlSchemaType)schema.SchemaTypes[new XmlQualifiedName(name, schemaNamespace)];

return ImportSchemaType(type, context, schemas, importer, compileUnit, mainNamespace, options, codeProvider);

}

public override string ImportSchemaType(XmlSchemaType type, XmlSchemaObject context, XmlSchemas schemas, XmlSchemaImporter importer, CodeCompileUnit compileUnit, CodeNamespace mainNamespace, CodeGenerationOptions options, CodeDomProvider codeProvider)
{

if (type == null)
{

return null;

}

if (importedTypes[type] != null)
{

mainNamespace.Imports.Add(new CodeNamespaceImport(typeof(DataSet).Namespace));

compileUnit.ReferencedAssemblies.Add("System.Data.dll");

return (string)importedTypes[type];

}

if (!(context is XmlSchemaElement))

return null;

if (type is XmlSchemaComplexType)
{

XmlSchemaComplexType ct = (XmlSchemaComplexType)type;

if (ct.Particle is XmlSchemaSequence)
{

XmlSchemaObjectCollection items = ((XmlSchemaSequence)ct.Particle).Items;

if (items.Count == 2 && items[0] is XmlSchemaAny && items[1] is XmlSchemaAny)
{

XmlSchemaAny any0 = (XmlSchemaAny)items[0];

XmlSchemaAny any1 = (XmlSchemaAny)items[1];

if (any0.Namespace == XmlSchema.Namespace && any1.Namespace == "urn:schemas-microsoft-com:xml-diffgram-v1")
{

string typeName = typeof(DataTable).FullName;

importedTypes.Add(type, typeName);

mainNamespace.Imports.Add(new CodeNamespaceImport(typeof(DataTable).Namespace));

compileUnit.ReferencedAssemblies.Add("System.Data.dll");

return typeName;

}

}

}

}

return null;

}

}

}
　　为此类添加进一个项目中，并将此项目进行强命名后编译。

　　然后，把该Assembly程序集加入到GAC中。

　　最后修改本机的machine.config，代码如下：
<sectionGroup name="system.xml.serialization" type="System.Xml.Serialization.Configuration.SerializationSectionGroup, System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<section name="schemaImporterExtensions" type="System.Xml.Serialization.Configuration.SchemaImporterExtensionsSection, System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
<section name="dateTimeSerialization" type="System.Xml.Serialization.Configuration.DateTimeSerializationSection, System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
<section name="xmlSerializer" type="System.Xml.Serialization.Configuration.XmlSerializerSection, System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</sectionGroup>




<system.xml.serialization>
<schemaImporterExtensions>
<add name="DataTableSchemaImporterExtension" type="Xrinehart.Tools.WebService.SchemaImporter.DataTableSchemaImporterExtension, Xrinehart.Tools.WebService.SchemaImporter,Version=1.0.0.0,Culture=neutral,PublicKeyToken=5a627ce15fb94702" />
</schemaImporterExtensions>
</system.xml.serialization>

　　完成以上的步骤后，再编译WebService，重新引用（或者更新Web引用），就可以正确的识别DataTable类型了。
　　其实DataTable只实现了序列化，但WebService并不能自己反序列化为可识别的格式，所以需要自己手动增加。由此可以衍生为各种业务实体BussinessEntity类对象也可以通过以上方式实现直接传递。

　　希望对大家有所帮助。

http://www.cnblogs.com/Xrinehart/archive/2006/08/20/481956.html

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