Create an object from an object.

[James Curran]

Given an object on unknown type, I'd like to create a new
(default-constructed) object of the same type. After some playing with
Reflection (my first foray into that area), I came up with the following:

public object CreateNew(object obj)
{
Type t = obj.GetType();
ConstructorInfo ctorInfo = t.GetConstructor(new Type[0]);
return ctorInfo.Invoke(new object[0]);
}

Is there a better way?

--
Truth,
James Curran
Home: www.noveltheory.com Work: www.njtheater.com
Blog: www.honestillusion.com Day Job: www.partsearch.com
(note new day job!)

 

[Robert Jordan]

Given an object on unknown type, I'd like to create a new
(default-constructed) object of the same type. After some playing with
Reflection (my first foray into that area), I came up with the following:

public object CreateNew(object obj)
{
Type t = obj.GetType();
ConstructorInfo ctorInfo = t.GetConstructor(new Type[0]);
return ctorInfo.Invoke(new object[0]);
}

Is there a better way?

Activator.CreateInstance(obj.GetType)

bye
Rob

 

[Richard Blewett [DevelopMentor]]

A little better, but to be honest your pretty much right on the button:

public object CreateNew(object obj)
{
Type t = obj.GetType();
ConstructorInfo ctorInfo = t.GetConstructor(type.EmptyTypes);

if( ctorInfo != null ) // better make sure there is a default ctor
return ctorInfo.Invoke(null);
else
return null;
}

Regards

Richard Blewett - DevelopMentor

http://staff.develop.com/richardb/weblog

nntp://news.microsoft.com/microsoft.public.dotnet.languages.csharp/<[email protected]>

Given an object on unknown type, I'd like to create a new
(default-constructed) object of the same type. After some playing with
Reflection (my first foray into that area), I came up with the following:

public object CreateNew(object obj)
{
Type t = obj.GetType();
ConstructorInfo ctorInfo = t.GetConstructor(new Type[0]);
return ctorInfo.Invoke(new object[0]);
}

Is there a better way?

--
Truth,
James Curran
Home: www.noveltheory.com Work: www.njtheater.com
Blog: www.honestillusion.com Day Job: www.partsearch.com
(note new day job!)



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[microsoft.public.dotnet.languages.csharp]

 

[Richard Blewett [DevelopMentor]]

LOL - fantastic!

I was so tied up in the implementation I didn't really think through the problem Much better solution.

Regards

Richard Blewett - DevelopMentor
http://staff.develop.com/richardb/weblog

nntp://news.microsoft.com/microsoft.public.dotnet.languages.csharp/<[email protected]>

Given an object on unknown type, I'd like to create a new
(default-constructed) object of the same type. After some playing with
Reflection (my first foray into that area), I came up with the following:

public object CreateNew(object obj)
{
Type t = obj.GetType();
ConstructorInfo ctorInfo = t.GetConstructor(new Type[0]);
return ctorInfo.Invoke(new object[0]);
}

Is there a better way?

Activator.CreateInstance(obj.GetType)

bye
Rob

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Checked by AVG anti-virus system (http://www.grisoft.com).
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[microsoft.public.dotnet.languages.csharp]

 

[James Curran]

LOL - fantastic!

I was so tied up in the implementation I didn't really think through the

problem Much better solution.

Although, as it turns out, in the project I planned (which has been
abandoned for other reasons), I'd want to create a number of these object,
so I'd probably want to use yours, separating the first & second halves, and
caching ctorInfo.

--
Truth,
James Curran
Home: www.noveltheory.com Work: www.njtheater.com
Blog: www.honestillusion.com Day Job: www.partsearch.com
(note new day job!)