c# - 使用自定义 IEqualityComparer 对字典进行 XML 序列化

Question

我想序列化具有自定义 IEqualityComparer 的字典。

我试过使用 DataContractSerializer 但我无法让 Comparer 被序列化。

由于 this，我无法使用 BinaryFormatter .

我总是可以做这样的事情:

var myDictionary = new MyDictionary(deserializedDictionary, myComparer);

但这意味着我需要字典使用的内存的两倍。

Answer 1

为什么自定义Comparer还要序列化？这是一个适合我的测试用例。

using System;using System.Collections.Generic;using System.Runtime.Serialization;using System.IO;public class MyKey {    public string Name { get; set; }    public string Id { get; set; }}public class MyKeyComparer :IEqualityComparer {    public bool Equals( MyKey x, MyKey y ) {        return x.Id.Equals( y.Id ) ;    }    public int GetHashCode( MyKey obj ) {        if( obj == null )             throw new ArgumentNullException();        return ((MyKey)obj).Id.GetHashCode();    }}public class MyDictionary :Dictionary {    public MyDictionary()        :base( new MyKeyComparer() )    {}}class Program {    static void Main( string[] args ) {        var myDictionary = new MyDictionary();        myDictionary.Add( new MyKey() { Name = "MyName1", Id = "MyId1" }, "MyData1" );        myDictionary.Add( new MyKey() { Name = "MyName2", Id = "MyId2" }, "MyData2" );        var ser = new DataContractSerializer( typeof( MyDictionary ) );        using( FileStream writer = new FileStream( "Test.Xml", FileMode.Create ) )            ser.WriteObject( writer, myDictionary );        using( FileStream reader = new FileStream( "Test.Xml", FileMode.Open ) )            myDictionary = (MyDictionary)ser.ReadObject( reader );    }}