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How to clone a MemoryStream?
I have code like the following:
MemoryStream ms = MyMethodThatGetsStream();
MemoryStream ms2 = MyMethodThatGetsStream();
// i do code which does something to the ms stream here.
// i do code with does something to the ms2 stream here.
The MyMethodThatGetsStream() is doing a lot of work (including calls to the database), but what it returns to ms and ms2 will be the same stream (except a new instance). What would make more sense would be to somehow clone the stream in ms into ms2 (and thus save calling MyMethodThatGetsStream() twice). In otherwords I want to do ms2 = ms, but I dont want to pass the value by reference, as I need to individually work with the streams later on.
I thought I would be able to do something like ms2 = ms.Clone(), but it there is no such method as Clone on the memoryStream object. Do I have to create a custom class, inherit from MemoryStream and then implement IClonable? One problem with this approach is that MyMethodThatGetsStream() returns a memoryStream, and its not ideal for me to change the type it returns, as it is been used in other parts of the program.
Any ideas? Many thanks.
MemoryStream ms = MyMethodThatGetsStream();
MemoryStream ms2 = MyMethodThatGetsStream();
// i do code which does something to the ms stream here.
// i do code with does something to the ms2 stream here.
The MyMethodThatGetsStream() is doing a lot of work (including calls to the database), but what it returns to ms and ms2 will be the same stream (except a new instance). What would make more sense would be to somehow clone the stream in ms into ms2 (and thus save calling MyMethodThatGetsStream() twice). In otherwords I want to do ms2 = ms, but I dont want to pass the value by reference, as I need to individually work with the streams later on.
I thought I would be able to do something like ms2 = ms.Clone(), but it there is no such method as Clone on the memoryStream object. Do I have to create a custom class, inherit from MemoryStream and then implement IClonable? One problem with this approach is that MyMethodThatGetsStream() returns a memoryStream, and its not ideal for me to change the type it returns, as it is been used in other parts of the program.
Any ideas? Many thanks.
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ms2 = new MemoryStream(ms.ToArray())
I will leave the question open and award points to anyone who can help with my understanding of Cloning in .NET. How is it usually possible to clone classes in the .NET framework that do not implement ICloneable, or are not Serializable.
I will leave the question open and award points to anyone who can help with my understanding of Cloning in .NET. How is it usually possible to clone classes in the .NET framework that do not implement ICloneable, or are not Serializable.
MemoryStream has a protected method MemberwiseClone()
So you can inherit MemoryStream and put a clone method which return MemberwiseClone() object.
Remember this is shallow copy. In case you need deep copy then you need to go ahead with the current method.
So you can inherit MemoryStream and put a clone method which return MemberwiseClone() object.
Remember this is shallow copy. In case you need deep copy then you need to go ahead with the current method.
Also, there will be no effect on the other part of the code as you will be able to call appropriate method by default.
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Do you mean something like this? Or would you do it a different way?
public class Class1
{
public Class1()
{
DoStuff();
}
private void DoStuff()
{
MemoryStream ms = MyMethodThatGetsStream();
MemoryStream ms2 = (MemoryStream) ((CustomMemoryStream)ms).C
}
}
public class CustomMemoryStream : System.IO.MemoryStream
{
public CustomMemoryStream()
{
}
public object Clone()
{
return this.MemberwiseClone();
}
}
public class Class1
{
public Class1()
{
DoStuff();
}
private void DoStuff()
{
MemoryStream ms = MyMethodThatGetsStream();
MemoryStream ms2 = (MemoryStream) ((CustomMemoryStream)ms).C
}
}
public class CustomMemoryStream : System.IO.MemoryStream
{
public CustomMemoryStream()
{
}
public object Clone()
{
return this.MemberwiseClone();
}
}
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C#
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Questions
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C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).