0

我已经在 .Net Core 2.2 控制台应用程序中安装了 Microsoft.CodeAnalysis.CSharp 和 Microsoft.CodeAnalysis.CSharp.Scripting（版本 3.3.1）包，并且我还开发了以下代码：

SyntaxTree syntaxTree = CSharpSyntaxTree.ParseText(@"
    public class MyGlobals
    {
        public int Age {get; set;} = 21;
    }
");

var references = new List<MetadataReference>
{
    MetadataReference.CreateFromFile(typeof(object).Assembly.Location)
};

var compilation = CSharpCompilation.Create("DynamicAssembly")
    .WithOptions(new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary))
    .AddSyntaxTrees(syntaxTree)
    .AddReferences(references);

Type globalsType = null;
Assembly assembly = null;
using (var memoryStream = new MemoryStream())
{
    var compileResult = compilation.Emit(memoryStream);
    assembly = Assembly.Load(memoryStream.GetBuffer());

    if (compileResult.Success)
    {
        globalsType = assembly.GetType("MyGlobals");
    }
}
var globals = Activator.CreateInstance(globalsType);
var validationResult = CSharpScript.EvaluateAsync<bool>("Age == 21", globals: globals);

创建了全局对象，但未计算表达式，并且 CSharpScript 引发以下异常：

当前上下文中不存在名称“Age”（您是否缺少对程序集“DynamicAssembly，Version=0.0.0.0，Culture=neutral，PublicKeyToken=null”的引用？）

有没有我错过的设置？

4

1 回答 1

0

您收到错误的原因是缺少对您刚刚创建的 DynamicAssembly 的引用。要解决此问题，您可以通过ScriptOptions调用CSharpScript.EvaluateAsync<bool>()。以下代码对我来说运行良好。

SyntaxTree syntaxTree = CSharpSyntaxTree.ParseText(@"
public class MyGlobals
{
    public int Age {get; set;} = 21;
}
");

var references = new List<MetadataReference>
{
    MetadataReference.CreateFromFile(typeof(object).Assembly.Location)
};

var compilation = CSharpCompilation.Create("DynamicAssembly")
    .WithOptions(new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary))
    .AddSyntaxTrees(syntaxTree)
    .AddReferences(references);

Type globalsType = null;
Assembly assembly = null;
using (var memoryStream = new MemoryStream())
{
    var compileResult = compilation.Emit(memoryStream);
    var buffer = memoryStream.GetBuffer();
    File.WriteAllBytes("DynamicAssembly.dll", buffer);
    assembly = Assembly.LoadFile(Path.GetFullPath("DynamicAssembly.dll"));

    if (compileResult.Success)
    {
        globalsType = assembly.GetType("MyGlobals");
    }
}

var globals = Activator.CreateInstance(globalsType);
var options = ScriptOptions.Default.WithReferences("DynamicAssembly.dll");

var validationResult = CSharpScript.EvaluateAsync<bool>(
    "Age == 21",
    globals: globals,
    options: options
);
Console.WriteLine(await validationResult);
于 2019-11-03T07:19:48.243 回答