Dynamically execute string as code in C#

问题

I need to convert string to executable code. The string is in foreach statement.

foreach (InsuredItem _i in p.InsuredItems)
{
    string formula = "(_i.PremiumRate/100)*SumAssured";
    _i.Premium = (Execute formula);
}

The formula is loaded from setup. this is just a demonstration. I need to execute the string in foreach loop. Thanks.

回答1:

Assuming that your formula is valid C# code and that it uses a known set of local variables (so that you can create a "globals" type containing all of them), you should be able to use Roslyn scripting API to do this:

public class Globals
{
    public InsuredItem _i;
    public decimal SumAssured;
}

…

string formula = "(_i.PremiumRate/100)*SumAssured";
var script = CSharpScript.Create<decimal>(formula, globalsType: typeof(Globals))
    .CreateDelegate();

foreach (InsuredItem _i in p.InsuredItems)
{
    _i.Premium = await script(new Globals { _i = _i, SumAssured = SumAssured });
}

来源：https://stackoverflow.com/questions/42992476/dynamically-execute-string-as-code-in-c-sharp