C# Eval Expression Evaluate, Compile and Execute C# code at runtime

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// From simple expression...
int result = Eval.Execute<int>("X + Y", new { X = 1, Y = 2})

// To complex code.
int result = Eval.Execute<int>(@"
 var list = new List<int>() { 1, 2, 3, 4, 5 };
 var filter = list.Where(x => x < 4);
 return filter.Sum(x => x);");



What's Eval-Expression.NET?

C# Eval Expression is an Eval function. You can Evaluate, Compile and Execute C# code at runtime.


Do you offer consulting services?

Yes, you can contact us for special requests: info@zzzprojects.com


Where can I find online examples?

Online examples are now available on .NET Fiddle!

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Evaluate dynamic arithmetic/math expression

Use a complete and fast compiler which support nearly everything.

  • Operator Precedence
  • Parenthesis
  • Pow Operator (2^^3 = 8)
C# Eval - Example
// Anonymous Type
int result = Eval.Execute<int>("X + Y", new { X = 1, Y = 2} );

// Class Member
dynamic expandoObject = new ExpandoObject();
expandoObject.X = 1;
expandoObject.Y = 2;
int result = Eval.Execute<int>("X + Y", expandoObject);

// Dictionary Key
var values = new Dictionary<string, object>() { {"X", 1}, {"Y", 2} };
int result = Eval.Execute<int>("X + Y", values);

// Argument Position
int result = Eval.Execute<int>("{0} + {1}", 1, 2);
Try it

Execute dynamic string code

Improve your applications flexibility by executing code using the same C# Syntax.

  • Evaluate stored formula
  • Perform LINQ operations with string
C# Eval - Dynamic LINQ Example
int result = Eval.Execute<int>(@"
var list = new List<int>() { 1, 2, 3, 4, 5 };
return list.Where(x => x > X).Take(Y).Count();", new { X = 1, Y = 2});
Try it

Compile fast property getter/setter

Improve your code readability and maintainability with an easy-to-use and easy-to-understand API.

  • Access internal and private property
  • Avoid using slow reflection
  • Avoid making complex lambda expression
C# Eval - Fast getter & setter Example
var customer = new Customer() { Name = "ZZZ" };

var nameGetter = Eval.Compile<Func<Customer, string>>("x.Name", "x");
var name = nameGetter(customer);
Try it