xmlserializer验证

Question

我使用XmlSerializer对Xml进行反序列化。但是我发现生成的类xsd.exe只提供读取xml的功能，而不提供验证。例如，如果文档中缺少一个节点，则生成的类的属性字段将为空，而不是像我预期的那样抛出验证异常。我怎样才能做到这一点呢？谢谢!

Answer 1

以下代码应在反序列化时根据架构进行验证。在序列化时，可以使用类似的代码根据模式进行验证。

private static Response DeserializeAndValidate(string tempFileName)
{
    XmlSchemaSet schemas = new XmlSchemaSet();
    schemas.Add(LoadSchema());

    Exception firstException = null;

    var settings = new XmlReaderSettings
                   {
                       Schemas = schemas,
                       ValidationType = ValidationType.Schema,
                       ValidationFlags =
                           XmlSchemaValidationFlags.ProcessIdentityConstraints |
                           XmlSchemaValidationFlags.ReportValidationWarnings
                   };
    settings.ValidationEventHandler +=
        delegate(object sender, ValidationEventArgs args)
        {
            if (args.Severity == XmlSeverityType.Warning)
            {
                Console.WriteLine(args.Message);
            }
            else
            {
                if (firstException == null)
                {
                    firstException = args.Exception;
                }

                Console.WriteLine(args.Exception.ToString());
            }
        };

    Response result;
    using (var input = new StreamReader(tempFileName))
    {
        using (XmlReader reader = XmlReader.Create(input, settings))
        {
            XmlSerializer ser = new XmlSerializer(typeof (Response));
            result = (Response) ser.Deserialize(reader);
        }
    }

    if (firstException != null)
    {
        throw firstException;
    }

    return result;
}

Answer 2

下面的代码将根据架构文件以编程方式手动加载和验证您的XML，从而允许您处理任何resulting errors and/or warnings。

//Read in the schema document
using (XmlReader schemaReader = XmlReader.Create("schema.xsd"))
{
    XmlSchemaSet schemaSet = new XmlSchemaSet();

    //add the schema to the schema set
    schemaSet.Add(XmlSchema.Read(schemaReader, 
    new ValidationEventHandler(
        delegate(Object sender, ValidationEventArgs e)
        {
        }    
    )));

    //Load and validate against the programmatic schema set
    XmlDocument xmlDocument = new XmlDocument();
    xmlDocument.Schemas = schemaSet;
    xmlDocument.Load("something.xml");

    xmlDocument.Validate(new ValidationEventHandler(
        delegate(Object sender, ValidationEventArgs e)
        {
            //Report or respond to the error/warning
        }
    )); 
 }

现在很明显，您希望由xsd.exe生成的类在加载时自动执行此操作(上述方法需要对XML文件进行第二次处理)，但是预加载验证将允许您以编程方式检测格式错误的输入文件。