反序列化从SQL查询返回的XML对象？

Question

I need to deserialize an XML object that 'should' be returned from a SQL query.

I had this working in JSON, but cannot use JSON so I am moving over to XML. The JsonConvert functionality gets my result in one line.. but I am not really sure how to handle what SQL gives me.

When writing to the server the Table is getting an Xdocument type, into a xml datatype cell.

        if (do_sql_read)
        {
            List<string> usernames = new List<string>();
            List<int> ids = new List<int>();
            string sql_load;

            Player player_after_load = new Player();

            //multiple
            string select_string = @"SELECT * FROM [Table]";

            using (SqlConnection sql_connection_a = new SqlConnection( GetConnectionString() ) )
            {
                sql_connection_a.Open();

                using (SqlCommand command = new SqlCommand(select_string, sql_connection_a))
                {
                    SqlDataReader reader = command.ExecuteReader(CommandBehavior.Default);

                    // XML VERSION
                    while (reader.Read())
                    {
                        int iii = reader.GetInt32(0);    // unique id int
                        string name = reader.GetString(1);  // Name string
                        sql_load = reader.GetString(2);
                        usernames.Add(name);
                        ids.Add(iii);

                        XmlSerializer XML_serializer = new XmlSerializer (typeof(Player));


                        // <<<<< THIS PART ??? >>>
                        player_after_load = (Player)XML_serializer.Deserialize (sql_load);

                        Console.WriteLine("SQLPlayer:  " + iii + " " + player_after_load.name + " " + player_after_load.health + " " + player_after_load.mana);
                    }


                    /* JSON VERSION WORKS
                    while (reader.Read())
                    {
                        int iii = reader.GetInt32(0);    // unique id int
                        string name = reader.GetString(1);  // Name string
                        sql_load = reader.GetString(2);
                        usernames.Add(name);
                        ids.Add(iii);

                        player_after_load = JsonConvert.DeserializeObject<Player>(sql_load);
                        Console.WriteLine("SQLPlayer:  " + iii + " " + player_after_load.name + " " + player_after_load.health + " " + player_after_load.mana);
                    }
                    */
                }
            }

        } // end do_sql_string

Answer 1

XMLSerializer 's Deserialize method does not have any overload that take a string. You can use Stream (using MemoryStream ) instead:

using (var ms = new MemoryStream(Encoding.UTF8.GetBytes(xml))) {
    player_after_load = (Player)XML_serializer.Deserialize(ms);
}

Ps: your variable names are terrible. You should see a C# Coding Convention.

Answer 2

I'm only adding this answer because you said you cannot use System.IO. If you can use System.IO please refer to DatVM's answer. Here is a sample of what you could do. I simplified this so that it includes a class to deserialize to, and it can be run in any console app.

using System;
using System.Xml;
using System.Xml.Serialization;

public class Player
{
    public string Name {get; set;}
}


public class Program
{
    public static void Main()
    {
        var str = "<Player><Name>Bobby</Name></Player>";
        var doc = new XmlDocument();
        var XML_serializer = new XmlSerializer(typeof(Player));
        doc.LoadXml(str);
        Player player_after_load;
        using (var nodeReader = new XmlNodeReader(doc))
        {
            player_after_load = (Player)XML_serializer.Deserialize(nodeReader);
        }
        Console.WriteLine(player_after_load.Name);

    }
}

Console Results

Bobby

Answer 3

But before that you need to create class with [Serializable] attribute:

[Serializable]
public class MyObject
{
     public int n1;
     public int n2;
     public String str;
 }

Then use standart deserializer:

IFormatter formatter = new BinaryFormatter();
MyObject obj = (MyObject) formatter.Deserialize(your_xml_object);