在 C# 中针对引用的 XSD 验证 XML

问题描述

我有一个带有指定架构位置的 XML 文件，例如:

I have an XML file with a specified schema location such as this:

xsi:schemaLocation="someurl ..localSchemaPath.xsd"

我想在 C# 中进行验证.当我打开文件时，Visual Studio 会根据架构验证它并完美地列出错误.但是，不知何故，如果不指定要验证的架构，我似乎无法在 C# 中自动验证它:

I want to validate in C#. Visual Studio, when I open the file, validates it against the schema and lists errors perfectly. Somehow, though, I can't seem to validate it automatically in C# without specifying the schema to validate against like so:

XmlDocument asset = new XmlDocument();

XmlTextReader schemaReader = new XmlTextReader("relativeSchemaPath");
XmlSchema schema = XmlSchema.Read(schemaReader, SchemaValidationHandler);

asset.Schemas.Add(schema);

asset.Load(filename);
asset.Validate(DocumentValidationHandler);

我不应该能够使用 XML 文件中指定的架构自动进行验证吗?我错过了什么?

Shouldn't I be able to validate with the schema specified in the XML file automatically ? What am I missing ?

推荐答案

您需要创建一个 XmlReaderSettings 实例，并在创建时将其传递给您的 XmlReader.然后可以订阅设置中的ValidationEventHandler来接收验证错误.您的代码最终将如下所示:

You need to create an XmlReaderSettings instance and pass that to your XmlReader when you create it. Then you can subscribe to the ValidationEventHandler in the settings to receive validation errors. Your code will end up looking like this:

using System.Xml;
using System.Xml.Schema;
using System.IO;

public class ValidXSD
{
    public static void Main()
    {

        // Set the validation settings.
        XmlReaderSettings settings = new XmlReaderSettings();
        settings.ValidationType = ValidationType.Schema;
        settings.ValidationFlags |= XmlSchemaValidationFlags.ProcessInlineSchema;
        settings.ValidationFlags |= XmlSchemaValidationFlags.ProcessSchemaLocation;
        settings.ValidationFlags |= XmlSchemaValidationFlags.ReportValidationWarnings;
        settings.ValidationEventHandler += new ValidationEventHandler(ValidationCallBack);

        // Create the XmlReader object.
        XmlReader reader = XmlReader.Create("inlineSchema.xml", settings);

        // Parse the file. 
        while (reader.Read()) ;

    }
    // Display any warnings or errors.
    private static void ValidationCallBack(object sender, ValidationEventArgs args)
    {
        if (args.Severity == XmlSeverityType.Warning)
            Console.WriteLine("	Warning: Matching schema not found.  No validation occurred." + args.Message);
        else
            Console.WriteLine("	Validation error: " + args.Message);

    }
}

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