我有一个看起来像这样的表(数据表)

 Hotelid    Room#   Description visitor Name    amount
    1          2    of             5    sam     10 
    1          2    of             5    sam      5
    1          2    of             5    sam     50
    1          2    of             8    james   50
    1          2    of             8    james   50
    1          2    of             6    justin  50
    2          3    sm             4    john     5
    2          4    al             3    jose     8
    3          5    ms             2    tim     10
    3          5    ms             7    tom     20

我想从中创建一个 XML。我正在为此使用 LINQ，但我完全感到困惑和疲倦。我不明白

<Hotels>
    <Hotel id="1" room="2" description="of">
    <Room="2" descr="of" visitor="5" name="sam"/>
        <fine amount="10"/>
        <fine amount="5"/>
        <fine amount="50"/>
        <Room="2" descr="of" visitor="8" name="james"/>
         <fine amount="50"/>
        <fine amount="50"/>
        <Room="2" descr="of" visitor="6" name="justin"/>
        <fine amount="50"/>
        </hotel>
        <Hotel id="2" room="3" description="sm">
        <Room="3" descr="sm" visitor="4" name="john"/>
        <fine amount="5"/>
        </hotel>
        <Hotel id="2" room="4" description="al">
        <Room="4" descr="al" visitor="3" name="jose"/>
        <fine amount="8"/>
        </hotel>

        <Hotel id="3" room="5" description="ms">
        <Room="5" descr="ms" visitor="2" name="tim"/>
        <fine amount="10"/>
        <Room="5" descr="ms" visitor="7" name="tom"/>
        <fine amount="20"/>
        </hotel>
    </Hotels>

我的代码是这样的

   var query =
    from row in Hotels.AsEnumerable()
    group row by new
    {
        Hotelid = row.Field<string>("Hotelid"),
        room = row.Field<string>("room"),
        descr = row.Field<string>("descr"),
    }
        into g
        select new XElement("Hotel",
                new XAttribute("Hotelid", g.Key.Hotelid),
                new XAttribute("room", g.Key.room),
                new XAttribute("desc", g.Key.desc),
                from row in g
                    select new XElement(
                    "Room",
                    new XAttribute("room", row.Field<string>("room#")),
                    new XAttribute("desc", row.Field<string>("desc")),
                    new XAttribute("visitor", row.Field<string>("visitor")),
                    new XAttribute("name", row.Field<string>("name")),
                from row in g 
                    select new XElement(
                    "fine",
                    new XAttribute("amount", row.Field<string>("amount"))));

                    var document = new XDocument(new XElement("Hotels", query));

但是我得到了具有相同值的“房间”的多个节点。有什么帮助吗？？？？ :(

最佳答案

哈哈哈，我想我对这个坏小子失去了一点理智。让我知道它是否对您有帮助。

void Main()
{
    var query =
    from row in Hotels.AsEnumerable()
    group row by new
    {
        row.Hotelid, row.Room, row.Description
    }
        into g
        select new XElement("Hotel",
                new XAttribute("Hotelid", g.Key.Hotelid),
                new XAttribute("room", g.Key.Room),
                new XAttribute("desc", g.Key.Description),
                from row in g
                    group row by new {row.Room, row.Description, row.Visitor, row.Name} into r
                    select new XElement(
                    "Room",
                    new XAttribute("room", r.Key.Room),
                    new XAttribute("desc", r.Key.Description),
                    new XAttribute("visitor", r.Key.Visitor),
                    new XAttribute("name", r.Key.Name),
                    new XAttribute("fineSum", r.Sum (x => x.Amount)),
                    from row in r                   
                    group row by new {row.Amount} into a
                    select new XElement("fine", a.Key.Amount )
              ));

    var document = new XDocument(new XElement("Hotels", query));                    

}

抱歉，忘了您正在使用 DataTable...

void Main()
{

    var query =
    from row in Hotels.AsEnumerable()
    group row by new
    {
        Hotelid = row.Field<string>("Hotelid"),
        room = row.Field<string>("room"),
        descr = row.Field<string>("Description")        
    }
        into g
        select new XElement("Hotel",
                new XAttribute("Hotelid", g.Key.Hotelid),
                new XAttribute("room", g.Key.room),
                new XAttribute("desc", g.Key.descr),
                from row in g
                    group row by new {
                        room = row.Field<string>("Room"),
                        descr = row.Field<string>("Description"), 
                        visitor = row.Field<string>("Visitor"), 
                        name = row.Field<string>("Name")
                    } into r
                    select new XElement(
                    "Room",
                    new XAttribute("room", r.Key.room),
                    new XAttribute("desc", r.Key.descr),
                    new XAttribute("visitor", r.Key.visitor),
                    new XAttribute("name", r.Key.name),
                    new XAttribute("fineSum", r.Sum (x => x.Field<int>("Amount"))),
                    from row in r                   
                    group row by new {fine = row.Field<int>("Amount")} into a
                    select new XElement("fine", a.Key.fine)
              ));

    var document = new XDocument(new XElement("Hotels", query));                    

}

// Define other methods and classes here

关于c# - 使用 LINQ 创建 XML，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18344055/