reflection - How do I compile an Expression Tree into a callable method, C#?

Question

I have an expression tree I have created by parsing an Xml using the expression class in C#. See this question.

I only have Add, Subtract, Divide, Multiply, Parameters, And and Or in my Expression Tree. Is there a way to convert this ExpressionTree into a callable method? ...or do I have to emit the IL manually?

Kind regards,

Answer 1

You need to create a lambda - i.e.

var lambda = Expression.Lambda<Func<float,int>>(body, param);
Func<float,int> method = lambda.Compile();
int v = method(1.0); // test

where "body" is your expression tree (taking a float, returning an int) involving the ParameterExpression param.

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