Compile expression that requires a parameter

Question

Ok, I am sure this is simple, but I am having a senior moment.

I have a simple BinaryExpression (greaterthan) the left side is a ParameterExpression and the right side is a ConstantExpression I want to compile this expression to a func that I can call and pass a parameter to...

var func = ...something with my exp....

bool result = func(myValue);

Thanks to Hasan, I modified his answer to my needs...

var func = Expression.Lambda<Func<int,bool>>(myExpr, (ParameterExpression)myExpr.left).Compile();

Muhammad Hasan Khan · Accepted Answer · 2011-10-10 05:38:47Z

7

var param = Expression.Parameter(typeof(int));
var value = Expression.Constant(3);
var body = Expression.GreaterThan(param, value);
var checkValue = Expression.Lambda<Func<int, bool>>(body, param).Compile();

Console.WriteLine(checkValue(4));
Console.WriteLine(checkValue(2));

answered Oct 10, 2011 at 5:38

Muhammad Hasan Khan

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1 Comment

Tim Jarvis Over a year ago

Thanks. In my case I already have the BinaryExpression so I didn't need to create it....but what I was missing is the requirement to pass the param into the lambda method....

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