Dynamic Code

[Roderick.Buhagiar]

Is it possible to create dynamic code which is not part of a class ?

 

[Jon Skeet [C# MVP]]

Is it possible to create dynamic code which is not part of a class ?

Could you clarify what you mean?

Jon

 

[Frank Werner]

Hello Roderick,

generally yes,

see: http://www.codeproject.com/useritems/Run-Time_Code_Generation1.asp

Regards

Frank

 

[Roderick.Buhagiar]

Hello Roderick,

generally yes,

see:http://www.codeproject.com/useritems/Run-Time_Code_Generation1.asp

Regards

Frank




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but that creates an assembly....right ? is it possible to run it
directly ?

 

[Frank Werner]

then this: http://www.codeproject.com/cs/algorithms/matheval.asp would fit
your needs


Regards

Frank

 

[Roderick.Buhagiar]

then this:http://www.codeproject.com/cs/algorithms/matheval.aspwould fit
your needs

Regards

Frank





- Show quoted text -

and is it possible to compile the code without putting it in a
class...example code = "Console.WriteLine("Hello");"

 

[Frank Werner]

well, it is a string variable that holds the source - so you can read it
from a stream or whatever.

regards

Frank

 

[Barry Kelly]

Is it possible to create dynamic code which is not part of a class ?

Yes, via DynamicMethod.

-- Barry

 

[Ravichandran J.V.]

The string variable 'str' contains code that will be compiled on the fly
and executed. For a simpler example,
let me know if this is what you meant by dynamic code.

You will need to compile the "base.dll" separately and modify the path
as well. Base.dll could be a simple class with a constructor.

using Microsoft.CSharp;
using System.CodeDom.Compiler;
using System.Windows.Forms;
using System;
using System.Reflection;
public class t
{
static void Main(){
Base myobj;
CSharpCodeProvider csp= new CSharpCodeProvider();
ICodeCompiler ic = csp.CreateCompiler();
CompilerParameters cparam= new CompilerParameters();
cparam.GenerateInMemory = true;
cparam.GenerateExecutable = false;
cparam.ReferencedAssemblies.Add("system.dll");
cparam.ReferencedAssemblies.Add(@"c:\c#_prgs\base.dll");
string str = "using System;"+
"class myclass" +
"{"+
"public myclass(){i=123;}"+
"public int i;"+
"public string ToString()"+
"{"+
"return i.ToString();"+
"}" +
"}";
CompilerResults cres= ic.CompileAssemblyFromSource(cparam,str);
foreach (CompilerError ce in cres.Errors)
MessageBox.Show(ce.ErrorText);

if (cres.Errors.Count == 0 && cres.CompiledAssembly != null)
{
Type ObjType = cres.CompiledAssembly.GetType("myclass");
try
{
if (ObjType != null)
{
myobj = (Base)Activator.CreateInstance(ObjType);
Console.WriteLine(myobj.ToString());
FieldInfo[] f= ObjType.GetFields();
foreach(FieldInfo ff in f)
{
MessageBox.Show(ff.Name + "=" + ff.GetValue(myobj).ToString());
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}

with regards,


J.V.Ravichandran
- http://www.geocities.com/
jvravichandran
- Or, just search on "J.V.Ravichandran"
at http://www.Google.com

 

[Roderick.Buhagiar]

Thanks a lot, but i was checking if it is possible to say for
example...
string mycode = "Console.WriteLine("Hello");";
then compile and run the code in mycode without putting in a class
name etc.. thanks.

 

[Jon Skeet [C# MVP]]

Thanks a lot, but i was checking if it is possible to say for
example...
string mycode = "Console.WriteLine("Hello");";
then compile and run the code in mycode without putting in a class
name etc.. thanks.

Well, you could always have an autogenerated (or even fixed, dummy)
class name, and the rest of the class structure. It's a bit ugly,
given that it'll have to generate a whole assembly etc, but I don't
know of any other way of doing it.

Jon

 

[Roderick.Buhagiar]

Well, you could always have an autogenerated (or even fixed, dummy)
class name, and the rest of the class structure. It's a bit ugly,
given that it'll have to generate a whole assembly etc, but I don't
know of any other way of doing it.

Jon

exactely that was my problem...thats why I asked maybe there's a way
to eliminate having to generate a whole assembly etc....

thanks