deepclone - Developer IT

difference between DataContract attribute and Serializable attribute in .net

- by samar

I am trying to create a deep clone of an object using the following method. public static T DeepClone<T>(this T target) { using (MemoryStream stream = new MemoryStream()) { BinaryFormatter formatter = new BinaryFormatter(); formatter.Serialize(stream, target); stream.Position = 0; return (T)formatter.Deserialize(stream); } } This method requires an object which is Serialized i.e. an object of a class who is having an attribute "Serializable" on it. I have a class which is having attribute "DataContract" on it but the method is not working with this attribute. I think "DataContract" is also a type of serializer but maybe different than that of "Serializable". Can anyone please give me the difference between the two? Also please let me know if it is possible to create a deepclone of an object with just 1 attribute which does the work of both "DataContract" and "Serializable" attribute or maybe a different way of creating a deepclone? Please help!

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I need to implement C# deep copy constructors with inheritance. What patterns are there to choose fr

- by Tony Lambert

I wish to implement a deepcopy of my classes hierarchy in C# public Class ParentObj : ICloneable { protected int myA; public virtual Object Clone () { ParentObj newObj = new ParentObj(); newObj.myA = theObj.MyA; return newObj; } } public Class ChildObj : ParentObj { protected int myB; public override Object Clone ( ) { Parent newObj = this.base.Clone(); newObj.myB = theObj.MyB; return newObj; } } This will not work as when Cloning the Child only a parent is new-ed. In my code some classes have large hierarchies. What is the recommended way of doing this? Cloning everything at each level without calling the base class seems wrong? There must be some neat solutions to this problem, what are they? Can I thank everyone for their answers. It was really interesting to see some of the approaches. I think it would be good if someone gave an example of a reflection answer for completeness. +1 awaiting!

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Create Clone Without Effecting Results of Original Object

- by user1655096

I have a function that when selecting an option, returns results. I want to be able to clone that function and have the ability to return another set of results, without adding the new results to the original object. // shows / hides results based on selection $(".categories-select").live("change" ,function(){ if($(this).val() == 'red'){ $('.red').removeClass('hide'); // toggles red results, sub menus $(this).parent('.controls').find('.sub').removeClass('hide'); } if($(this).val() == 'blue'){ $('.blue').removeClass('hide'); $(this).parent('.controls').find('.sub').addClass('hide'); } if($(this).val() == 'purple'){ $('.purple').removeClass('hide'); $(this).parent('.controls').find('.sub').addClass('hide'); } if($(this).val() == 'orange'){ $('.orange').removeClass('hide'); $(this).parent('.controls').find('.sub').addClass('hide'); } }); // Duplicates category select menu $(".add-color").find(function(){ $(".color-category").clone().removeClass('color-category').appendTo("#we-want-to").find('.sub,').addClass('hide') ; }); $(".add-color-alternate").click(function(){ $(".color-category-alternate").clone().removeClass('color-category-alternate').appendTo("#we-want-to").find('.sub, .results-table').addClass('hide'); });

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Is there any convinient way that i can deepclone 'style' instance in silverlight?

- by Kevin Yang

if a style is used, it can not be modified agaign. so i need a clone method. but its hard to implement. what i want to do is implementing a cascading 'style' mechanism. for example, i set two style to the same frameworkelement. the same property of latter style will override the former one, while the different property remain unchanged. but if i set the style property of the frameworkelement twice directly, the 1st style will be gone. so i use the baseon property of style class to do that. but now come across another problem, the style can not be modified after it's been set to a frameworkelement. so now i need a clone method.

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Shallow Copy vs DeepCopy in C#.NET

Hope below example helps to understand the difference. Please drop a comment if any doubts. using System; using System.IO; using System.Runtime.Serialization.Formatters.Binary; namespace ShallowCopyVsDeepCopy { class Program { static void Main(string[] args) { var e1 = new Emp { EmpNo = 10, EmpName = "Smith", Department = new Dep { DeptNo = 100, DeptName = "Finance" } }; var e2 = e1.ShallowClone(); e1.Department.DeptName = "Accounts"; Console.WriteLine(e2.Department.DeptName); var e3 = new Emp { EmpNo = 10, EmpName = "Smith", Department = new Dep { DeptNo = 100, DeptName = "Finance" } }; var e4 = e3.DeepClone(); e3.Department.DeptName = "Accounts"; Console.WriteLine(e4.Department.DeptName); } } [Serializable] class Dep { public int DeptNo { get; set; } public String DeptName { get; set; } } [Serializable] class Emp { public int EmpNo { get; set; } public String EmpName { get; set; } public Dep Department { get; set; } public Emp ShallowClone() { return (Emp)this.MemberwiseClone(); } public Emp DeepClone() { MemoryStream ms = new MemoryStream(); BinaryFormatter bf = new BinaryFormatter(); bf.Serialize(ms, this); ms.Seek(0, SeekOrigin.Begin); object copy = bf.Deserialize(ms); ms.Close(); return copy as Emp; } } } span.fullpost {display:none;}

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Shallow Copy vs DeepCopy in C#.NET

Hope below example helps to understand the difference. Please drop a comment if any doubts. using System; using System.IO; using System.Runtime.Serialization.Formatters.Binary; namespace ShallowCopyVsDeepCopy { class Program { static void Main(string[] args) { var e1 = new Emp { EmpNo = 10, EmpName = "Smith", Department = new Dep { DeptNo = 100, DeptName = "Finance" } }; var e2 = e1.ShallowClone(); e1.Department.DeptName = "Accounts"; Console.WriteLine(e2.Department.DeptName); var e3 = new Emp { EmpNo = 10, EmpName = "Smith", Department = new Dep { DeptNo = 100, DeptName = "Finance" } }; var e4 = e3.DeepClone(); e3.Department.DeptName = "Accounts"; Console.WriteLine(e4.Department.DeptName); } } [Serializable] class Dep { public int DeptNo { get; set; } public String DeptName { get; set; } } [Serializable] class Emp { public int EmpNo { get; set; } public String EmpName { get; set; } public Dep Department { get; set; } public Emp ShallowClone() { return (Emp)this.MemberwiseClone(); } public Emp DeepClone() { MemoryStream ms = new MemoryStream(); BinaryFormatter bf = new BinaryFormatter(); bf.Serialize(ms, this); ms.Seek(0, SeekOrigin.Begin); object copy = bf.Deserialize(ms); ms.Close(); return copy as Emp; } } } span.fullpost {display:none;}

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Serialization of non-required fields in protobuf-net

- by David Hedlund

I have a working java client that is communicating with Google, through ProtoBuf serialized messages. I am currently trying to translate that client into C#. I have a .proto file where the parameter appId is an optional string. Its default value in the C# representation as generated by the protobuf-net library is an empty string, just as it is in the java representation of the same file. message AppsRequest { optional AppType appType = 1; optional string query = 2; optional string categoryId = 3; optional string appId = 4; optional bool withExtendedInfo = 6; } I find that when I explicitly set appId to "" in the java client, the client stops working (403 Bad Request from Google). When I explicitly set appId to null in the java client, everything works, but only because hasAppId is being set to false (I'm uncertain as to how that affects the serialization). In the C# client, I always get 403 responses. I don't see any logic behind the distinction between not setting a value, and setting the default value, that seems to make all the difference in the java client. Since the output is always a binary stream, I am not sure if the successful java messages are being serialized with an empty string, or not serialized at all. In the C# client, I've tried setting IsRequired to true on the ProtoMember attribute, to force them to serialize, and I've tried setting the default value to null, and explicitly set "", so I'm quite sure I've tried some configuration where the value is being serialized. I've also played around with ProtoBuf.ProtoIgnore and at some point, removing the appId parameter altogether, but I haven't been able to avoid the 403 errors in C#. I've tried manually copying the serialized string from java, and that resolved my issues, so I'm certain that the rest of the HTTP Request is working, and the error can be traced to the serialized object. My serialization is simply this: var clone = ProtoBuf.Serializer.DeepClone(request); MemoryStream ms = new MemoryStream(2000); ProtoBuf.Serializer.Serialize(ms, clone); var bytearr = ms.ToArray(); string encodedData = Convert.ToBase64String(bytearr); I'll admit to not being quite sure about what DeepClone does. I've tried both with and without it...

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How to force a deep copy when copying structs with arrays?

- by Danvil

If have a struct A { public double[] Data; public int X; } How can I force a deep copy when using operator= or adding instances of A to a container? The problem is for example: A a = new A(); var list = new List<A>(); list.Add(a); // does not make a deep copy of Data A b = a; // does not make a deep copy of Data Do I really have to implement my own DeepClone method and call it every time? This would be extremly error-prone ...

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