根据这里找到的代码：
protobuf and List<object> – how to serialize / deserialize?我创建了一个通用的“ProtoDictionary”,其值类型为ProtoObject.
这是我的ProtoDictionary代码：
public class ProtoDictionary<TKey> : Dictionary<TKey,ProtoObject>
{
public void Add(TKey key,string value)
{
base.Add(key,new ProtoObject<<string>(value));
}
public void Add(TKey key,List<string> value)
{
base.Add(key,new ProtoObject<List<string>>(value));
}
public void Add(TKey key,List<UrlStatus> value)
{
base.Add(key,new ProtoObject<List<UrlStatus>>(value));
}
public void Add(TKey key,Dictionary<string,string> value)
{
base.Add(key,new ProtoObject<Dictionary<string,string>>(value));
}
public void Add(TKey key,int> value)
{
base.Add(key,int>>(value));
}
public void Add(TKey key,List<TrafficEntry> value)
{
base.Add(key,new ProtoObject<List<TrafficEntry>>(value));
}
public ProtoDictionary()
{
// Do nothing
}
// NOTE: For whatever reason,this class will not correctly deserialize without this method,even though
// the base class,Dictionary,has the SerializableAttribute. It's protected so only the framework can access it.
protected ProtoDictionary(SerializationInfo info,StreamingContext context) : base(info,context)
{
}
}
对于ProtoObject：
[ProtoContract]
[ProtoInclude(1,typeof(ProtoObject<string>))]
[ProtoInclude(2,typeof(ProtoObject<int>))]
[ProtoInclude(3,typeof(ProtoObject<List<string>>))]
[ProtoInclude(4,typeof(ProtoObject<Dictionary<string,string>>))]
[ProtoInclude(5,typeof(ProtoObject<List<TrafficEntry>>))]
[ProtoInclude(6,int>>))]
[ProtoInclude(7,typeof(ProtoObject<bool>))]
[ProtoInclude(8,typeof(ProtoObject<double>))]
[ProtoInclude(9,typeof(ProtoObject<decimal>))]
[ProtoInclude(10,typeof(ProtoObject<float>))]
[ProtoInclude(11,typeof(ProtoObject<long>))]
[ProtoInclude(12,typeof(ProtoObject<SerializableException>))]
[ProtoInclude(13,typeof(ProtoObject<List<UrlStatus>>))]
[Serializable]
public abstract class ProtoObject
{
public static ProtoObject<T> Create<T>(T value)
{
return new ProtoObject<T>(value);
}
public object Value
{
get { return ValueImpl; }
set { ValueImpl = value; }
}
protected abstract object ValueImpl { get; set; }
protected ProtoObject()
{
}
}
[ProtoContract]
[Serializable]
public sealed class ProtoObject<T> : ProtoObject
{
public ProtoObject()
{
}
public ProtoObject(T value)
{
Value = value;
}
[ProtoMember(1)]
public new T Value { get; set; }
protected override object ValueImpl
{
get { return Value; }
set { Value = (T)value; }
}
public override string ToString()
{
return Value.ToString();
}
}
问题是,当我尝试使用以下代码从sql反序列化ProtoDictionary时：
public T Deserialize<T>(IDataReader reader,string columnName)
{
MemoryStream stream = new MemoryStream();
byte[] buffer = new byte[256];
long startIndex = 0;
long bytesRead = reader.GetBytes(reader.Getordinal(columnName),startIndex,buffer,buffer.Length);
while(bytesRead == buffer.Length)
{
stream.Write(buffer,(int)bytesRead);
startIndex += bytesRead;
bytesRead = reader.GetBytes(reader.Getordinal(columnName),buffer.Length);
}
stream.Write(buffer,(int)bytesRead);
stream.Seek(0,SeekOrigin.Begin);
return (T)Utilities.Deserialize<T>(stream);
}
我收到错误“InvalidOperationException：无法创建抽象类的实例.”
我的StackTrace如下：
at ctorWrapper() at ProtoBuf.ObjectFactory`1.Create() in c:\protobuf-net_fixed\trunk\protobuf-net\ObjectFactory.cs:line 82 at ProtoBuf.Serializer`1.Deserialize[TCreation](T& instance,SerializationContext context) in c:\protobuf-net_fixed\trunk\protobuf-net\SerializerT.cs:line 568 at ProtoBuf.Property.PropertyMessageString`4.DeserializeImpl(TSource source,SerializationContext context) in c:\protobuf-net_fixed\trunk\protobuf-net\Property\PropertyMessageString.cs:line 53 at ProtoBuf.Property.PropertyPairstring`3.DeserializeImpl(TSource source,SerializationContext context) in c:\protobuf-net_fixed\trunk\protobuf-net\Property\PropertyPairstring.cs:line 53 at ProtoBuf.Property.PropertyList`3.DeserializeImpl(TSource source,SerializationContext context,Boolean canSetValue) in c:\protobuf-net_fixed\trunk\protobuf-net\Property\PropertyList.cs:line 64 at ProtoBuf.Property.PropertyList`3.Deserialize(TSource source,SerializationContext context) in c:\protobuf-net_fixed\trunk\protobuf-net\Property\PropertyList.cs:line 52 at ProtoBuf.Serializer`1.Deserialize[TCreation](T& instance,SerializationContext context) in c:\protobuf-net_fixed\trunk\protobuf-net\SerializerT.cs:line 568 at ProtoBuf.Serializer`1.DeserializeChecked[TCreation](T& instance,SerializationContext source) in c:\protobuf-net_fixed\trunk\protobuf-net\SerializerT.cs:line 400 at ProtoBuf.SerializerSimpleProxy`1.Deserialize(TValue& value,SerializationContext source) in c:\protobuf-net_fixed\trunk\protobuf-net\SerializerProxy.cs:line 100 at ProtoBuf.Serializer.Deserialize[T](SerializationContext source) in c:\protobuf-net_fixed\trunk\protobuf-net\Serializer.cs:line 302 at ProtoBuf.Serializer.Deserialize[T](Stream source) in c:\protobuf-net_fixed\trunk\protobuf-net\Serializer.cs:line 289 at Demand.TestFramework.Core.Utilities.Deserialize[T](MemoryStream stream) in C:\QA\trunk\TestFramework\Core\Utilities.cs:line 312 at Demand.TestFramework.Core.Reports.CrawlerReport.Deserialize[T](IDataReader reader,String columnName) in C:\QA\trunk\TestFramework\Core\Reports\CrawlerReport.cs:line 145 at Demand.TestFramework.Core.Reports.CrawlerReport.FormatSuite(Int32 parentSuiteId,Guid runId) in C:\QA\trunk\TestFramework\Core\Reports\CrawlerReport.cs:line 70 at Demand.TestFramework.Core.Reports.CrawlerReport.Format(Guid runId) in C:\QA\trunk\TestFramework\Core\Reports\CrawlerReport.cs:line 150 at ServiceLauncher.Form1.btnStart_Click(Object sender,EventArgs e) in C:\QA\trunk\TestFramework\ServiceLauncher\Form1.cs:line 24 at System.Windows.Forms.Control.OnClick(EventArgs e) at System.Windows.Forms.Button.OnClick(EventArgs e) at System.Windows.Forms.Button.onmouseup(MouseEventArgs mevent) at System.Windows.Forms.Control.WmMouseUp(Message& m,MouseButtons button,Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ButtonBase.WndProc(Message& m) at System.Windows.Forms.Button.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd,Int32 msg,IntPtr wparam,IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.dispatchMessageW(MSG& msg) at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.imsoComponentManager.FPushMessageLoop(IntPtr dwComponentID,Int32 reason,Int32 pvLoopData) at System.Windows.Forms.Application.threadcontext.RunMessageLoopInner(Int32 reason,ApplicationContext context) at System.Windows.Forms.Application.threadcontext.RunMessageLoop(Int32 reason,ApplicationContext context) at System.Windows.Forms.Application.Run(Form mainForm) at ServiceLauncher.Program.Main() in C:\QA\trunk\TestFramework\ServiceLauncher\Program.cs:line 16 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly,String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile,Evidence assemblySecurity,String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext,ContextCallback callback,Object state,Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext,Object state) at System.Threading.ThreadHelper.ThreadStart()
我不确定我做错了什么.任何帮助将不胜感激.
谢谢,
担
解决方法
这可能仅仅是“v1”中的限制.我已经
added this作为“v2”的测试了,它通过了(我必须发明UrlStatus和TrafficEntry才能让它编译)：
public enum UrlStatus { A,B }
public enum TrafficEntry { A }
[ProtoContract]
public class SerializableException { }
[Test]
public void TestBasicroundtrip()
{
var item = new ProtoDictionary<string>();
item.Add("abc","def");
item.Add("ghi",new List<UrlStatus> {UrlStatus.A,UrlStatus.B});
var clone = Serializer.DeepClone(item);
Assert.AreEqual(2,clone.Keys.Count);
object o = clone["abc"];
Assert.AreEqual("def",clone["abc"].Value);
var list = (IList<UrlStatus>)clone["ghi"].Value;
Assert.AreEqual(2,list.Count);
Assert.AreEqual(UrlStatus.A,list[0]);
Assert.AreEqual(UrlStatus.B,list[1]);
}
使用“v1”,或许根本就不要把它抽象化？ (解决方法,不修复)
也;不需要SerializationInfo ctor; protobuf-net不使用它(虽然你可以通过提供这个方法并调用Merge在BinaryFormatter中实现protobuf-net)
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