为什么我无法在 C# 中序列化元组？
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Why I could not serialize a tuple in C#?
提问by user1278322
Possible Duplicate:
Why XML-Serializable class need a parameterless constructor
I'm trying to serialize a tuple in my code:
我正在尝试在我的代码中序列化一个元组：
List<List<Tuple<String, CodeExtractor.StatementNode>>> results = null;
results = extractor.ExtractSourceCode(sourceCode);
FileStream fs = new FileStream(@"C:\Projects\Test\ast.xml", FileMode.Create);
XmlSerializer formatter = new XmlSerializer(
typeof(List<List<Tuple<String, CodeExtractor.StatementNode>>>));
formatter.Serialize(fs, results);
fs.Close();
but it was failed and catch the exception like this:
但它失败了并捕获了这样的异常：
System.Tuple`2[System.String,CodeExtractor.StatementNode] cannot be serialized because it does not have a parameterless constructor.
System.Tuple`2[System.String,CodeExtractor.StatementNode] 无法序列化，因为它没有无参数构造函数。
and I'm do sure the CodeExtractor.StatementNodecould be serialized.
我确信CodeExtractor.StatementNode可以序列化。
回答by Erno
As the exception tells you: The Tuple<T1, T2>has NO parameterless constructor which is needed by the serializer.
正如异常告诉您的那样：Tuple<T1, T2>没有序列化程序所需的无参数构造函数。
回答by Rune FS
For XmlSerializerto be able to do its job it needs a default contructor. That is a constructor that takes no arguments. All the Tuple<...>classes have a single constructor and that constructor takes a number of arguments. One for each value in the tuple. So in your case the sole constructor is
为了XmlSerializer能够完成它的工作，它需要一个默认的构造函数。那是一个没有参数的构造函数。所有的Tuple<...>类都有一个构造函数，并且该构造函数接受许多参数。元组中的每个值一个。所以在你的情况下，唯一的构造函数是
Tuple(T1 value1, T2 value2)
The serializer is looking for a constructor with no arguments and because it can't find it, you get the exception.
序列化程序正在寻找一个没有参数的构造函数，因为它找不到它，所以你得到了异常。
you could create a mutable class, that could be substituted for tuples for the purpose of serialization
您可以创建一个可变类，该类可以替换为序列化的元组
class MyTuple<T1, T2>
{
MyTuple() { }
public T1 Item1 { get; set; }
public T2 Item2 { get; set; }
public static implicit operator MyTuple<T1, T2>(Tuple<T1, T2> t)
{
return new MyTuple<T1, T2>(){
Item1 = t.Item1,
Item2 = t.Item2
};
}
public static implicit operator Tuple<T1, T2>(MyTuple<T1, T2> t)
{
return Tuple.Create(t.Item1, t.Item2);
}
}
You could then use it the following way
然后您可以通过以下方式使用它
XmlSerializer formatter = new XmlSerializer(
typeof(List<List<MyTuple<String, CodeExtractor.StatementNode>>>));
formatter.Serialize(fs, results.SelectMany(
lst => lst.Select(
t => (MyTuple)t
).ToList()
).ToList());
