DeSerialization给出了奇怪的运行时错误？
DeSerialization给出了奇怪的运行时错误？
提问于 2011-07-12 03:38:00
反序列化不起作用。它给出了以下运行时错误：
Unhandled Exception: System.InvalidCastException: Unable to cast object of 'Measurement' to type 'Measurement'.
我真的看不出有什么问题。
//start alternate serialization
public static class AltSerialization
{
public static byte[] AltSerialize(Measurement m)
{
using (var ms = new MemoryStream())
{
var bf = new BinaryFormatter();
bf.Serialize(ms, m);
return ms.GetBuffer();
}
}
public static Measurement AltDeSerialize(byte[] seriM)
{
using (var stream = new MemoryStream( seriM ))
{
BinaryFormatter bf = new BinaryFormatter();
return (Measurement)bf.Deserialize(stream);
}
}
}
//end alternte serialization
[Serializable] //This attribute sets class to be serialized
public class Measurement : ISerializable
{
[NonSerialized] public int id;
public int time; //timestamp
public double value;
public Measurement()
{
id = 1;
time = 12;
value = 0.01;
}
public Measurement(int _id, int _time, double _value)
{
id = _id;
time = _time;
value = _value;
}
//Deserialization constructor
public Measurement(SerializationInfo info, StreamingContext ctxt)
{
//Assign the values from info to the approporiate properties
Console.WriteLine("DeSerialization construtor called.");
time = (int)info.GetValue("MeasurementTime", typeof(int));
value = (double)info.GetValue("MeasurementValue", typeof(double));
}
//Serialization function
public void GetObjectData(SerializationInfo info, StreamingContext ctxt)
{
// Custom name-value pair
// Values must be read with the same name they're written
info.AddValue("MeasurementTime", time);
info.AddValue("MeasurementValue", value);
}
}
//AFTER THIS, IS FOR TEST FILES app1.cs, app2.cs, and the reference refer.cs.
//app1.cs
using System;
using System.IO;
using System.Collections.Generic;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using refer;
using System.Reflection;
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
[assembly: AssemblyVersion("1.0.0.0")]
public class MainClass
{
public static void Main()
{
//Create a new Measurement message
Measurement m1 = new Measurement(2, 2345, 23.456);
System.Console.WriteLine("\nm1.id = {0}", m1.id);
System.Console.WriteLine("m1.time = {0}", m1.time);
System.Console.WriteLine("m1.value = {0}", m1.value);
/*byte[] bArray = AltSerialization.AltSerialize( m1 );
Measurement m2 = new Measurement();
m2 = AltSerialization.AltDeSerialize(bArray);
System.Console.WriteLine("\nm2.id = {0}", m2.id);
System.Console.WriteLine("m2.time = {0}", m2.time);
System.Console.WriteLine("m2.value = {0}", m2.value);*/
ConnectionFactory factory = new ConnectionFactory();
factory.HostName = "localhost";
using (IConnection connection = factory.CreateConnection())
using (IModel channel = connection.CreateModel())
{
channel.QueueDeclare("hello", true, false, false, null);
byte[] body = refer.AltSerialization.AltSerialize( m1 );
channel.BasicPublish("", "hello", null, body);
Console.WriteLine(" [x] Sent ");
}
}
}
//app2.cs
using System;
using System.IO;
using System.Collections.Generic;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using refer;
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
using System.Reflection;
[assembly: AssemblyVersion("1.0.0.0")]
public class MainClass
{
public static void Main()
{
/*/Create a new Measurement message
Measurement m1 = new Measurement(2, 2345, 23.456);
System.Console.WriteLine("\nm1.id = {0}", m1.id);
System.Console.WriteLine("m1.time = {0}", m1.time);
System.Console.WriteLine("m1.value = {0}", m1.value);
byte[] bArray = AltSerialization.AltSerialize( m1 );*/
Measurement m2 = new Measurement();
ConnectionFactory factory = new ConnectionFactory();
factory.HostName = "localhost";
using (IConnection connection = factory.CreateConnection())
using (IModel channel = connection.CreateModel()) {
channel.QueueDeclare("hello", false, false, false, null);
QueueingBasicConsumer consumer = new QueueingBasicConsumer(channel);
channel.BasicConsume("hello", true, consumer);
System.Console.WriteLine(" [*] Waiting for messages." +
"To exit press CTRL+C");
BasicDeliverEventArgs ea =
(BasicDeliverEventArgs)consumer.Queue.Dequeue();
m2 = refer.AltSerialization.AltDeSerialize(ea.Body);
System.Console.WriteLine(" \n[x] Received ");
System.Console.WriteLine("\nm2.id = {0}", m2.id);
System.Console.WriteLine("m2.time = {0}", m2.time);
System.Console.WriteLine("m2.value = {0}", m2.value);
}
}
}
//refer.cs
using System;
using System.IO;
using System.Collections.Generic;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Reflection;
[assembly: AssemblyVersion("1.0.0.0")]
namespace refer
{
//start alternate serialization
public static class AltSerialization
{
public static byte[] AltSerialize(Measurement m)
{
using (var ms = new MemoryStream())
{
var bf = new BinaryFormatter();
bf.AssemblyFormat = System.Runtime.Serialization.Formatters.FormatterAssemblyStyle.Simple;
bf.Serialize(ms, m);
return ms.GetBuffer();
}
}
public static Measurement AltDeSerialize(byte[] seriM)
{
using (var stream = new MemoryStream( seriM ))
{
BinaryFormatter bf = new BinaryFormatter();
bf.AssemblyFormat = System.Runtime.Serialization.Formatters.FormatterAssemblyStyle.Simple;
return (Measurement)bf.Deserialize(stream);
}
}
}
//end alternte serialization
[Serializable] //This attribute sets class to be serialized
public class Measurement : ISerializable
{
[NonSerialized] public int id;
public int time; //timestamp
public double value;
public Measurement()
{
id = 1;
time = 12;
value = 0.01;
}
public Measurement(int _id, int _time, double _value)
{
id = _id;
time = _time;
value = _value;
}
//Deserialization constructor
public Measurement(SerializationInfo info, StreamingContext ctxt)
{
//Assign the values from info to the approporiate properties
Console.WriteLine("DeSerialization construtor called.");
time = (int)info.GetValue("MeasurementTime", typeof(int));
value = (double)info.GetValue("MeasurementValue", typeof(double));
}
//Serialization function
public void GetObjectData(SerializationInfo info, StreamingContext ctxt)
{
// Custom name-value pair
// Values must be read with the same name they're written
info.AddValue("MeasurementTime", time);
info.AddValue("MeasurementValue", value);
}
}
}
public class MainClass
{
public static void Main()
{
}
}回答 5
Stack Overflow用户
发布于 2011-07-12 03:43:47
编辑：
控制台应用程序的程序集名称不同，因此即使命名空间和类型名称相同，BinaryFormatter仍会记录程序集的名称。在公共类库程序集中定义测量类，并从两个控制台应用程序中引用它。
原始答案：
最有可能的情况是，序列化对象的一端是使用与反序列化对象的一端不同的程序集版本编译的。检入包含测量的部件的AssemblyInfo.cs文件，以确保完全指定了AssemblyVersion。
[assembly: AssemblyVersion("1.0.0.0")]不
[assembly: AssemblyVersion("1.0.*")]如果这不起作用，请确保程序集文件在这两个位置是相同的。
Stack Overflow用户
发布于 2011-07-12 03:45:13
如果您有两个应用程序，一个正在序列化，另一个正在反序列化，并且它们与序列化类型(Measurment)共享一个DLL，但共享的DLL是不同的构建，则会出现此错误。
Stack Overflow用户
发布于 2011-07-12 03:45:20
只是猜测一下:您正在尝试使用Measurement类反序列化二进制文件，该类现在位于不同的名称空间中，然后在文件序列化的时刻。
检查之前序列化数据的代码，并检查与您的名称空间相关的 Measurement名称空间。
致以问候。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/6655491
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