Hi, all,
If I write follow code in c# method. The IDE will compile it to a complex construct method of System.Linq.Expression.
Expression<Func<int>> ex = () => 10;
will be compile to:
Expression<Func<int>> ex = Expression.Lambda<Func<int>> (Expression.Literal(10))
It is so smart. I can travel in this expression tree. I can do some smart abilities on this design.

Now, I want write a console application. If user input follow string from console,
() => 10
I want make a LambdaExpression object and execute it in my context.
I can use CodeDom to compile some c# code to a dynamic assembly. But I have not found a utility to compile c# code to an expression object.

How to compile a c# Lambda expression to a Expression object? Help me. Thanks.

Well, it isn't that simple... you'd need to parse that yourself and
build the Expression by hand, or use the "dynamic LINQ" sample (which
does much of that):

http://weblogs.asp.net/scottgu/archi...y-library.aspx

An alternative would be to use the CSharpCodeProvider to compile it *as*
C# (with suitable wrappers), and load the generated assembly on the fly;
not pretty.

Marc

Thanks Marc.

I had download the sample. It look is so cool. Thank you vary much.

"Marc Gravell" <(E-Mail Removed)> wrote in message
news:%23$(E-Mail Removed)...
> Well, it isn't that simple... you'd need to parse that yourself and
> build the Expression by hand, or use the "dynamic LINQ" sample (which
> does much of that):
>
> http://weblogs.asp.net/scottgu/archi...y-library.aspx
>
> An alternative would be to use the CSharpCodeProvider to compile it *as*
> C# (with suitable wrappers), and load the generated assembly on the fly;
> not pretty.
>
> Marc