How Can I Dynamically Evaluate C# Expressions at Runtime Using Roslyn?

Dynamic evaluation of C# expression at runtime

In software development, sometimes it is necessary to dynamically evaluate the C# expression at runtime. This article will provide a modern and efficient solution.

Traditional methods usually use

to compile and execute expressions, but this method is outdated and no longer meets the best practice of modern C#.

CSharpCodeProvider The better method is to use the Roslyn script API. The API provides a engine dedicated to dynamically evaluating the C# script and expression, which simplifies the expression evaluation process:

This example evaluate the expression "1 3", and assign the results to

<code class="language-csharp">using Microsoft.CodeAnalysis.CSharp.Scripting;

var result = CSharpScript.EvaluateAsync("1 + 3").Result;</code>

variables. To evaluate code fragments with specific data types, you can use the corresponding generic method:

result

Roslyn script API also supports passing parameters, managing naming space, and processing more complicated scenes. For more information, please refer to the official document:

<code class="language-csharp">var now = CSharpScript.EvaluateAsync<string>("System.DateTime.Now.ToString()").Result;</code>

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