ASP.NET 2.0 WebService中傳遞DataTable參考

asp.net|web|參考

　　在2.0正式版發布之前，就滿天的看到關於DataTable支援序列化的新特性宣傳，滿以為從此以後使用DataTable就和DataSet一樣方便了，結果在應用項目的時候才發現並非那麼回事。
　　DataTable是支援序列化了，但是微軟並沒有把他做的特別方便，還需要我們自己來做一些工作之後才能夠在WebService裡面傳遞DataTable，否則在引用DataTable的時候會發現DataTable變成了一個什麼Proxy類型。
　　首先編寫類DataTableSchemaImporterExtension，代碼如下：
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;

        }

    }

}
　　為此類添加進一個項目中，並將此項目進行強命名後編譯。

　　然後，把該Assembly程式集加入到GAC中。

　　最後修改原生machine.config，代碼如下：
      <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>

　　完成以上的步驟後，再編譯WebService，重新引用（或者更新Web引用），就可以正確的識別DataTable類型了。
　　其實DataTable只實現了序列化，但WebService並不能自己還原序列化為可識別的格式，所以需要自己手動增加。由此可以衍生為各種業務實體BussinessEntity類對象也可以通過以上方式實現直接傳遞。

　　希望對大家有所協助。