在写入流时使用XmlDiffPatch

Question

我正在尝试使用xmldiffpatch来写入流。

第一种方法是将xml写入内存流。第二种方法从文件加载xml，并为要写入的修补文件创建一个流。第三种方法实际上比较了这两个文件。我总是得到两个文件是相同的，即使它们不是，所以我知道我遗漏了什么。

如有任何帮助，我们不胜感激！

public MemoryStream FirstXml() 

    {
        string[] names = { "John", "Mohammed", "Marc", "Tamara", "joy" };
        MemoryStream ms = new MemoryStream();
        XmlTextWriter xtw= new XmlTextWriter(ms, Encoding.UTF8);

        xtw.WriteStartDocument();
        xtw.WriteStartElement("root");

        foreach (string s in names)
        {
        xtw.WriteStartElement(s);
        xtw.WriteEndElement();
        }
        xtw.WriteEndElement();
        xtw.WriteEndDocument();
        return ms;
    }

    public Stream SecondXml()
    {
        XmlReader finalFile =XmlReader.Create(@"c:\......\something.xml");
        MemoryStream ms = FirstXml();
        XmlReader originalFile = XmlReader.Create(ms);
        MemoryStream ms2 = new MemoryStream();
        XmlTextWriter dgw = new XmlTextWriter(ms2, Encoding.UTF8);
        GenerateDiffGram(originalFile, finalFile, dgw);
        return ms2;
    }

    public void GenerateDiffGram(XmlReader originalFile, XmlReader finalFile,
                                XmlWriter dgw)
    {
        XmlDiff xmldiff = new XmlDiff();
        bool bIdentical = xmldiff.Compare(originalFile, finalFile, dgw);
        dgw.Close();
        StreamReader sr = new StreamReader(SecondXml());
        string xmlOutput = sr.ReadToEnd();
        if(xmlOutput.Contains("</xd:xmldiff>"))
        {Console.WriteLine("Xml files are not identical");
            Console.Read();}

        else
        {Console.WriteLine("Xml files are identical");Console.Read();}

    }

Answer 1

以下修改后的版本可以正常工作。

static void Main()
{
    SecondXml();
}

public static string FirstXml()
{
    string[] names = { "John", "Mohammed", "Marc", "Tamara", "joy" };
    var sw = new StringWriter();
    var xtw = new XmlTextWriter(sw);

    xtw.WriteStartDocument();
    xtw.WriteStartElement("root");

    foreach (string s in names)
    {
        xtw.WriteStartElement(s);
        xtw.WriteEndElement();
    }
    xtw.WriteEndElement();
    xtw.WriteEndDocument();

    return sw.ToString();
}

public static void SecondXml()
{
    string secondXml = File.ReadAllText(@"t:\something.xml");
    string firstXml = FirstXml();

    Console.WriteLine("Comparing...");

    string result = GenerateDiffGram(firstXml, secondXml);

    Console.WriteLine(result);

    Console.WriteLine();
    Console.WriteLine("Finished compare");


    Console.Out.Write(firstXml);

    Console.WriteLine();

    Console.WriteLine();

    Console.WriteLine(secondXml);
}

public static string GenerateDiffGram(string originalFile, string finalFile)
{
    var xmldiff = new XmlDiff();
    var r1 = XmlReader.Create(new StringReader(originalFile));
    var r2 = XmlReader.Create(new StringReader(finalFile));
    var sw = new StringWriter();
    var xw = new XmlTextWriter(sw) {Formatting = Formatting.Indented};
    bool bIdentical = xmldiff.Compare(r1, r2, xw);
    Console.WriteLine();
    Console.WriteLine("bIdentical: " + bIdentical);

    return sw.ToString();
}

实际上我并不完全确定你的原始代码出了什么问题。在第一个和第二个读取器中，被比较的XML都是一个空字符串。既然你使用内存流作为后备存储，那么你不会像上面那样使用字符串丢失任何东西。