C# Eval Expression Compile & Execute Methods

Description

Compile and execute a C# expression at runtime.

Execute

Execute a C# expression and return the result:

• Execute<TResult>(string code)
• Execute<TResult>(string code, object parameters)
• Execute<TResult>(string code, params object[] parameters)
• Execute(string code)
• Execute(string code, object parameters)
• Execute(string code, params object[] parameters)

Example

// using Z.Expressions; // Don't forget to include this.

var context = new EvalContext();
// ... context options ...

string code = "Price * Quantity";
var price = context.Execute<decimal>(code, orderItem);

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Compile

Compile a C# expression and return a delegate:

• Compile<TDelegate>(string code)
• Compile<TDelegate>(string code, IEnumerable<string> parameterNames)
• Compile<TDelegate>(string code, params string[] parameterNames)
• Compile(string): Func<object>
• Compile(string, Type type1): Func<object, object>
• Compile(string, Type type1, ... , Type type9): Func<object, ... , object, object>
• Compile(string, IEnumerable<Type>): Func<IEnumerable, object>
• Compile(string, params Type[]): Func<IEnumerable, object>
• Compile(string, IDictionary<string, Type>): Func<IDictionary, object>

Example

// using Z.Expressions; // Don't forget to include this.

var context = new EvalContext();
// ... context options ...

string code = "Price * Quantity";
var compiled = context.Compile<Func<OrderItem, decimal>>(code);

decimal totals = 0;
foreach(var item in list)
{
    totals += compiled(item);
}

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