一个Remoting中的实体序列化问题
各位：List <MyClass> 类型只要我继承它，并在子类中标识可序列化，那么就可以在remoting中传输，如下，
[Serializable]
public class ItemList : List <MyItem>
{ }
但是如果是Dictionary <String, MyItem> 我即使是继承了可序列化，还是不能在netremoting中传输，如下
[Serializable]
public class ItemList : Dictionary <String, Item>
{ }
传输的时候提示错误：Soap 序列化程序不支持序列化一般类型: System.Collections.Generic.GenericEqualityComparer`1[System.String]。
怎么解决这个问题
[解决办法]
Serializable序列化值类型
而MarshalByRefObject序列化引用类型
[解决办法]
友情帮顶
[解决办法]
远程处理对于序列化和反序列化有特殊的要求，这些要求在msdn中的“可远程处理的对象”和“不可远程处理的对象”中有着详细的描述。
以下是字典集合使用的序列化：
[SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)]
public virtual void GetObjectData(SerializationInfo info, StreamingContext context) {
if (info==null) {
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.info);
}
info.AddValue(VersionName, version);
info.AddValue(ComparerName, comparer, typeof(IEqualityComparer <TKey> ));
info.AddValue(HashSizeName, buckets == null ? 0 : buckets.Length); //This is the length of the bucket array.
if( buckets != null) {
KeyValuePair <TKey, TValue> [] array = new KeyValuePair <TKey, TValue> [Count];
CopyTo(array, 0);
info.AddValue(KeyValuePairsName, array, typeof(KeyValuePair <TKey, TValue> []));
}
}
System.Collections.Generic.GenericEqualityComparer是一个不可远程处理的对象，当然导致Dictionary <TK,TV> 也是不可远程处理的对象，你必须提供自己扩展实现，以便Dictionary <TK,TV> 可以远程处理。
以下是比较器的定义的源代码：
[Serializable()]
[TypeDependencyAttribute( "System.Collections.Generic.GenericEqualityComparer`1 ")]
public abstract class EqualityComparer <T> : IEqualityComparer, IEqualityComparer <T>
{
static EqualityComparer <T> defaultComparer;
public static EqualityComparer <T> Default {
get {
EqualityComparer <T> comparer = defaultComparer;
if (comparer == null) {
comparer = CreateComparer();
defaultComparer = comparer;
}
return comparer;
}
}
private static EqualityComparer <T> CreateComparer() {
Type t = typeof(T);
// Specialize type byte for performance reasons
if (t == typeof(byte)) {
return (EqualityComparer <T> )(object)(new ByteEqualityComparer());
}
// If T implements IEquatable <T> return a GenericEqualityComparer <T>
if (typeof(IEquatable <T> ).IsAssignableFrom(t)) {
//return (EqualityComparer <T> )Activator.CreateInstance(typeof(GenericEqualityComparer <> ).MakeGenericType(t));
return (EqualityComparer <T> )(typeof(GenericEqualityComparer <int> ).TypeHandle.CreateInstanceForAnotherGenericParameter(t));
}
// If T is a Nullable <U> where U implements IEquatable <U> return a NullableEqualityComparer <U>
if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable <> )) {
Type u = t.GetGenericArguments()[0];
if (typeof(IEquatable <> ).MakeGenericType(u).IsAssignableFrom(u)) {
//return (EqualityComparer <T> )Activator.CreateInstance(typeof(NullableEqualityComparer <> ).MakeGenericType(u));
return (EqualityComparer <T> )(typeof(NullableEqualityComparer <int> ).TypeHandle.CreateInstanceForAnotherGenericParameter(u));
}
}
// Otherwise return an ObjectEqualityComparer <T>
return new ObjectEqualityComparer <T> ();
}
public abstract bool Equals(T x, T y);
public abstract int GetHashCode(T obj);
internal virtual int IndexOf(T[] array, T value, int startIndex, int count) {
int endIndex = startIndex + count;
for (int i = startIndex; i < endIndex; i++) {
if (Equals(array[i], value)) return i;
}
return -1;
}
internal virtual int LastIndexOf(T[] array, T value, int startIndex, int count) {
int endIndex = startIndex - count + 1;
for (int i = startIndex; i > = endIndex; i--) {
if (Equals(array[i], value)) return i;
}
return -1;
}
int IEqualityComparer.GetHashCode(object obj) {
if (obj == null) return 0;
if (obj is T) return GetHashCode((T)obj);
ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidArgumentForComparison);
return 0;
}
bool IEqualityComparer.Equals(object x, object y) {
if (x == y) return true;
if (x == null || y == null) return false;
if ((x is T) && (y is T)) return Equals((T)x, (T)y);
ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidArgumentForComparison);
return false;
}
}
// The methods in this class look identical to the inherited methods, but the calls
// to Equal bind to IEquatable <T> .Equals(T) instead of Object.Equals(Object)
[Serializable()]
internal class GenericEqualityComparer <T> : EqualityComparer <T> where T: IEquatable <T>
{
public override bool Equals(T x, T y) {
if (x != null) {
if (y != null) return x.Equals(y);
return false;
}
if (y != null) return false;
return true;
}
public override int GetHashCode(T obj) {
if (obj == null) return 0;
return obj.GetHashCode();
}
internal override int IndexOf(T[] array, T value, int startIndex, int count) {
int endIndex = startIndex + count;
if (value == null) {
for (int i = startIndex; i < endIndex; i++) {
if (array[i] == null) return i;
}
}
else {
for (int i = startIndex; i < endIndex; i++) {
if (array[i] != null && array[i].Equals(value)) return i;
}
}
return -1;
}
internal override int LastIndexOf(T[] array, T value, int startIndex, int count) {
int endIndex = startIndex - count + 1;
if (value == null) {
for (int i = startIndex; i > = endIndex; i--) {
if (array[i] == null) return i;
}
}
else {
for (int i = startIndex; i > = endIndex; i--) {
if (array[i] != null && array[i].Equals(value)) return i;
}
}
return -1;
}
// Equals method for the comparer itself.
public override bool Equals(Object obj){
GenericEqualityComparer <T> comparer = obj as GenericEqualityComparer <T> ;
return comparer != null;
}
public override int GetHashCode() {
return this.GetType().Name.GetHashCode();
}
}
[解决办法]
对于你的问题，指定反序列化级别，或者指定BinaryFormatter可能有助于解决问题！
