How Can I Dynamically Evaluate C# Expressions Using Roslyn?

Use Roslyn to dynamically evaluate C#expression

In the construction of data -driven applications or running the time code generation, dynamic evaluation C#expression is often required. This article will demonstrate how to use the Microsoft Roslyn compiler platform to achieve this goal.

Use the script API

Roslyn's script API provides a convenient way to evaluate expression and code fragments. The specific steps are as follows:

Install the Nuget package:

Add

to your project with Nuget.

1. Evaluation expression: Microsoft.CodeAnalysis.CSharp.Scripting Use the

   Method to evaluate the expression and store the results into the appropriate variable. For example:

2. Specify the result type: CSharpScript.EvaluateAsync In order to specify the type of evaluated expression, the generic

   method can be used. This ensures that the result is strong. For example:

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

3. Example usage CSharpScript.EvaluateAsync<T>

   The following code fragments demonstrate how to use the script API evaluation example expression:

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

High -level characteristics

Script API supports many senior characteristics, for example:

The parameters of the passing code passed by the evaluation code

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

// 评估 "1 + 3"
var result = CSharpScript.EvaluateAsync("1 + 3").Result;
Console.WriteLine(result); // 输出 4

// 评估 "System.DateTime.Now.ToString()"
var now = CSharpScript.EvaluateAsync<string>("System.DateTime.Now.ToString()").Result;
Console.WriteLine(now); // 输出当前日期时间</code>

Provide a reference to the assembly Specify the name space and target framework

For more details, please refer to the Roslyn script API document:

https://www.php.cn/link/6e52547a0e7bca35975b6f8761e7ae

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