C# Eval Expression

C# Eval Expression The most powerful C# expression evaluator to execute C# code and dynamic LINQ at runtime

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


string userInput = "x.Status == 'Active'";
var customers = context.Customers.Where(x => userInput).ToList();

What is C# Eval Expression?

This library is an expression evaluation for people that want to evaluate string as code at runtime.

Is it free?

All LINQ methods are 100% free (unlimited characters). Free up to 50 characters for Execute and Compile methods.

Do you offer a free trial?

We offer a monthly trial. You can download the latest version to extend your trial every month!

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Execute C# Code

Use the Execute method when evaluating a C# expression only once.

var list = new List<int>() { 1, 2, 3, 4 };
var greaterThan = 2;

list = Eval.Execute<List<int>>("list.Where(x => x > greaterThan)", 
   new { list, greaterThan });

Compile C# Code

Use the Compile method when evaluating the same C# expression multiple times but with different parameter values.

var compiled = Eval.Compile<Func<List<int>>>(@"
var list = new List<int>() { 1, 2, 3, 4 };
return list.Where(x => x > 2).ToList();
");

var list = compiled();

LINQ Dynamic

LINQ is great, but using it with dynamic expression makes it awesome!

OrderByDynamic
SelectDynamic
WhereDynamic
And more!

var dict = new Dictionary<string, object>();
dict.Add("Statut", 0);
dict.Add("LastLogon", DateTime.Now.AddMonths(-1));
 
var customers = context.Customers
 .WhereDynamic(x => "x.Status == Statut 
                     && x.LastLogon >= LastLogon", dict)
 .ToList();