你需要使用xsd.exe工具，它会被安装到一个类似于Windows SDK的目录中:

C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin

在64位计算机上:

C:\Program Files (x86)\Microsoft SDKs\Windows\v6.0A\bin

在Windows 10电脑上:

C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\bin

在第一次运行时，您使用XSD .exe并将示例XML转换为XSD文件(XML模式文件):

xsd yourfile.xml

这会给你你的文件。在第二步中，您可以再次使用xsd.exe将其转换为c#类:

xsd yourfile.xsd /c

这应该会给你一个文件yourfile.cs，它将包含一个c#类，你可以使用它来反序列化你得到的XML文件-类似于:

XmlSerializer serializer = new XmlSerializer(typeof(msg));
msg resultingMessage = (msg)serializer.Deserialize(new XmlTextReader("yourfile.xml"));

在大多数情况下都能很好地工作。

更新:XML序列化器将接受任何流作为它的输入-文件或内存流都可以:

XmlSerializer serializer = new XmlSerializer(typeof(msg));
MemoryStream memStream = new MemoryStream(Encoding.UTF8.GetBytes(inputString));
msg resultingMessage = (msg)serializer.Deserialize(memStream);

或者使用StringReader:

XmlSerializer serializer = new XmlSerializer(typeof(msg));
StringReader rdr = new StringReader(inputString);
msg resultingMessage = (msg)serializer.Deserialize(rdr);

简化达米安的回答，

public static T ParseXml<T>(this string value) where T : class
{
    var xmlSerializer = new XmlSerializer(typeof(T));
    using (var textReader = new StringReader(value))
    {
        return (T) xmlSerializer.Deserialize(textReader);
    }
}

在这个日期(2020-07-24)，我已经看过了所有的答案，必须有一个更简单、更熟悉的方法来解决这个问题，这就是下面。

两个场景……一个是XML字符串是否格式良好，即它以<?XML版本="1.0"编码="utf-16"?>或类似的值，然后再遇到根元素，即问题中的<msg>。另一种是如果它不是良好形式的，即只有根元素(例如问题中的<msg>)和它的子节点。

首先，只是一个简单的类，其中包含以不区分大小写的名称匹配XML中根节点的子节点的属性。所以，从问题来看，它会是这样的…

public class TheModel
{
    public int Id { get; set; }
    public string Action { get; set; }
}

下面是剩下的代码…

// These are the key using statements to add.
using Newtonsoft.Json;
using System.Xml;

bool isWellFormed = false;
string xml =  = @"
<msg>
   <id>1</id>
   <action>stop</action>
</msg>
";

var xmlDocument = new XmlDocument();
xmlDocument.LoadXml(xml);
if (isWellFormed)
{
    xmlDocument.RemoveChild(xmlDocument.FirstChild); 
    /* i.e. removing the first node, which is the declaration part. 
    Also, if there are other unwanted parts in the XML, 
    write another similar code to locate the nodes 
    and remove them to only leave the desired root node 
    (and its child nodes).*/
}

var serializedXmlNode = JsonConvert.SerializeXmlNode(
            xmlDocument, 
            Newtonsoft.Json.Formatting.Indented, 
            true
            );
var theDesiredObject = JsonConvert.DeserializeObject<TheModel>(serializedXmlNode);

尝试此方法将Xml转换为对象。它正是为你正在做的事情而做的:

protected T FromXml<T>(String xml)
{
    T returnedXmlClass = default(T);

    try
    {
        using (TextReader reader = new StringReader(xml))
        {
            try
            {
                returnedXmlClass = 
                    (T)new XmlSerializer(typeof(T)).Deserialize(reader);
            }
            catch (InvalidOperationException)
            {
                // String passed is not XML, simply return defaultXmlClass
            }
        }
    }
    catch (Exception ex)
    {
    }

    return returnedXmlClass ;        
}

使用下面的代码调用它:

YourStrongTypedEntity entity = FromXml<YourStrongTypedEntity>(YourMsgString);

以防有人觉得这个有用:

public static class XmlConvert
{
    public static string SerializeObject<T>(T dataObject)
    {
        if (dataObject == null)
        {
            return string.Empty;
        }
        try
        {
            using (StringWriter stringWriter = new System.IO.StringWriter())
            {
                var serializer = new XmlSerializer(typeof(T));
                serializer.Serialize(stringWriter, dataObject);
                return stringWriter.ToString();
            }
        }
        catch (Exception ex)
        {
            return string.Empty;
        }
    }

    public static T DeserializeObject<T>(string xml)
         where T : new()
    {
        if (string.IsNullOrEmpty(xml))
        {
            return new T();
        }
        try
        {
            using (var stringReader = new StringReader(xml))
            {
                var serializer = new XmlSerializer(typeof(T));
                return (T)serializer.Deserialize(stringReader);
            }
        }
        catch (Exception ex)
        {
            return new T();
        }
    }
}

你可以使用:

MyCustomObject myObject = new MyCustomObject();
string xmlString = XmlConvert.SerializeObject(myObject);
myObject = XmlConvert.DeserializeObject<MyCustomObject>(xmlString);

您可以使用xsd.exe在.Net中创建模式绑定类，然后使用XmlSerializer反序列化字符串:http://msdn.microsoft.com/en-us/library/system.xml.serialization.xmlserializer.deserialize.aspx