What is the best way to create a clone of a DTO? There is not an ICloneable interface or a BinaryFormatter class in Silverlight. Is reflection the only way?
創建DTO克隆的最佳方法是什么? Silverlight中沒有ICloneable接口或BinaryFormatter類。反思是唯一的方法嗎?
9
Here is the code we came up with for cloning. This works in Silverlight 2 & 3.
這是我們為克隆提出的代碼。這適用於Silverlight 2和3。
Public Shared Function Clone(Of T)(ByVal source As T) As T
Dim serializer As New DataContractSerializer(GetType(T))
Using ms As New MemoryStream
serializer.WriteObject(ms, source)
ms.Seek(0, SeekOrigin.Begin)
Return DirectCast(serializer.ReadObject(ms), T)
End Using
End Function
3
ICloneable is not available in Silverlight 4(I don't know about 1/2/3 or upcoming version) . It is removed from Silverlight 4's public APIs. Help from Mike Schall code; it is working for me.
Silverlight 4中沒有ICloneable(我不知道1/2/3或即將推出的版本)。它已從Silverlight 4的公共API中刪除。來自Mike Schall代碼的幫助;它對我有用。
public LayerDto Clone(LayerDto source)
{
DataContractSerializer serializer = new DataContractSerializer(typeof(LayerDto));
using (MemoryStream ms = new MemoryStream())
{
serializer.WriteObject(ms, source);
ms.Seek(0, SeekOrigin.Begin);
return (LayerDto)serializer.ReadObject(ms);
}
}
1
How to create clone if my source is IEnumerable. This LayerDto also has some object type(eg MetaItemDto).
如果我的源是IEnumerable,如何創建克隆。這個LayerDto也有一些對象類型(例如MetaItemDto)。
Code :
public class LayerDto { }
public class MetaItemDtoList : System.Collections.ObjectModel.ObservableCollection { }
public class LayerDto {} public class MetaItemDtoList:System.Collections.ObjectModel.ObservableCollection {}
public static IEnumerable Clone(IEnumerable source)
public static IEnumerable Clone(IEnumerable source)
{
IEnumerable<LayerDto> layers;
DataContractSerializer serializer = new DataContractSerializer(typeof(IEnumerable<LayerDto>));
using (MemoryStream ms = new MemoryStream())
{
serializer.WriteObject(ms, source);
ms.Seek(0, SeekOrigin.Begin);
//return (IEnumerable<LayerDto>)serializer.ReadObject(ms);
layers = (IEnumerable<LayerDto>)serializer.ReadObject(ms);
return layers;
}
}
but what is problem I am facing is that layer doesn't show it's metaItems(for every layer).
但是我面臨的問題是圖層沒有顯示它的metaItems(對於每一層)。
0
I believe the standard cloning functionality was left out to keep it simple and lightweight. I believe you could use either JSON or XML serialization to achieve the same thing though. Not sure about the performance costs though.
我相信標准的克隆功能是為了保持簡單和輕量級。我相信你可以使用JSON或XML序列化來實現同樣的目的。但不確定性能成本。
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