如何在运行时针对 xsd 验证 xml，而不将 xsd 文件保存在本地文件夹中? [英] How to validate, on runtime, xml against xsd without save the xsd file on local folder?

问题描述

我的目标是针对字符串变量中的 xsd 验证 xml 文件.Ps.:我周五已经写了一个编号为3072697的问题.但我今天无法添加此代码.

My objective is to validade a xml file against the xsd whitch is in a string variable. Ps.: I already wrote a question numbered 3072697 on Friday. But I couldn't add this code today.

book.xml:

<?xml version="1.0" encoding="utf-8"?>
<author  xmlns='urn:bookstore-schema' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'>
  <first-name>Herman</first-name>
  <last-name>Melville</last-name>
</author>

book.xsd:

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="NewDataSet" targetNamespace="urn:bookstore-schema" xmlns:mstns="urn:bookstore-schema" xmlns="urn:bookstore-schema" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" attributeFormDefault="qualified" elementFormDefault="qualified">
  <xs:element name="author">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="first-name" type="xs:string" minOccurs="0" />
        <xs:element name="last-name" type="xs:string" minOccurs="0" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="NewDataSet" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
    <xs:complexType>
      <xs:choice minOccurs="0" maxOccurs="unbounded">
        <xs:element ref="author" />
      </xs:choice>
    </xs:complexType>
  </xs:element>
</xs:schema>

Xsd_after_saved() 工作正常在 Xsd_after_saved() 中，我需要使用 XSD 的每个地方，都是从本地文件中获取的

The Xsd_after_saved() is woorking perfectlly In Xsd_after_saved(), every place I need to use the XSD, I got from file locally

public void Xsd_after_saved()
{
    XmlReaderSettings settings = new XmlReaderSettings();
    settings.ValidationEventHandler += this.ValidationEventHandler;

    settings.ValidationType = ValidationType.Schema;
    settings.Schemas.Add(null, XmlReader.Create(@"C:\book.xsd"));
    settings.CheckCharacters = true;

    XmlReader XmlValidatingReader = XmlReader.Create(@"C:\book.xml", settings);

    XmlTextReader Reader = new XmlTextReader(@"C:\book.xml");

    StreamReader SR = new StreamReader(@"C:\book.xsd");

    XmlSchema Schema = new XmlSchema();

    Schema = XmlSchema.Read(SR, ValidationEventHandler);

    XmlValidatingReader ValidatingReader = new XmlValidatingReader(Reader);

    ValidatingReader.ValidationType = ValidationType.Schema;

    ValidatingReader.Schemas.Add(Schema);

    try
    {
        XmlValidatingReader.Read();
        XmlValidatingReader.Close();

        ValidatingReader.ValidationEventHandler += ValidationEventHandler;

        while ((ValidatingReader.Read()))
        {
        }

        ValidatingReader.Close();
    }
    catch (Exception ex)
    {
        ValidatingReader.Close();
        XmlValidatingReader.Close();

    }
}

Xsd_whithout_saved() 不工作在 Xsd_whithout_saved() 中，我需要 XSD 的每个地方，我都从名为 readerXsd 的变量 StreamReader 中获得，该变量来自字符串

The Xsd_whithout_saved() is not working In Xsd_whithout_saved(), every place I need the XSD, I got from variable StreamReader named readerXsd whitch come from a string

public void  Xsd_whithout_saved()
{
    //>>>Here is the biggest diference from the method Xsd_after_saved: I manipulate the XSD as string because it will come from database and 
    //it will not allowed to be saved locally
    XmlDocument xmlDoc = new XmlDocument();
    xmlDoc.Load(@"C:\book.xsd");
    //In the futute, strArquivoInteiro will be fullfill by xsd comming from database as nvarchar(max) and I will not be allowed to save as a file locally
    string strArquivoInteiro = xmlDoc.OuterXml;

    byte[] byteArray = Encoding.ASCII.GetBytes(strArquivoInteiro);
    MemoryStream streamXSD = new MemoryStream(byteArray);
    //<<<

    StreamReader readerXsd = new StreamReader(streamXSD);

    XmlReaderSettings settings = new XmlReaderSettings();
    settings.ValidationEventHandler += this.ValidationEventHandler;

    settings.ValidationType = ValidationType.Schema;
    settings.Schemas.Add(null, XmlReader.Create(readerXsd));
    settings.CheckCharacters = true;

    XmlReader XmlValidatingReader = XmlReader.Create(@"C:\book.xml", settings);

    XmlTextReader Reader = new XmlTextReader(@"C:\book.xml");

    XmlSchema Schema = new XmlSchema();

    //IN THIS LINE I RECEIVED THE XmlException "Root Element is Missing" and I can't understand the reason
    Schema = XmlSchema.Read(readerXsd, ValidationEventHandler);

    XmlValidatingReader ValidatingReader = new XmlValidatingReader(Reader);

    ValidatingReader.ValidationType = ValidationType.Schema;

    ValidatingReader.Schemas.Add(Schema);

    try
    {

        XmlValidatingReader.Read();
        XmlValidatingReader.Close();

        ValidatingReader.ValidationEventHandler += ValidationEventHandler;

        while ((ValidatingReader.Read()))
        {

        }

        ValidatingReader.Close();
    }
    catch (Exception ex)
    {
        ValidatingReader.Close();
        XmlValidatingReader.Close();
    }
}

private void ValidationEventHandler(object sender, ValidationEventArgs args)
{
    //place to deal with xml file no valided
}

推荐答案

使用此方法从字符串生成流，(感谢 Cameron MacFarland)

Use this method to generate stream from string, (thanks to Cameron MacFarland)

public Stream GenerateStreamFromString(string s)
{
    MemoryStream stream = new MemoryStream();
    StreamWriter writer = new StreamWriter(stream);
    writer.Write(s);
    writer.Flush();
    stream.Position = 0;
    return stream;
}

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