如何使用 Roslyn 检查属性是否用自定义属性装饰?

How to check if a property is decorated with a custom attribute using Roslyn?(如何使用 Roslyn 检查属性是否用自定义属性装饰?)

问题描述

我想使用 Roslyn 分析一个 C# 类，并打算在访问的属性应用了特定属性时做一些事情.如何在 CSharpSyntaxWalker.VisitPropertyDeclaration 方法覆盖中做到这一点?

I want to analyse a C# class using Roslyn and intend to do something when visited property has the specific attribute applied to it. How can I do this in the CSharpSyntaxWalker.VisitPropertyDeclaration method override?

例如，在下面的代码块中，我想知道 Date 属性是否具有 Validation 属性，如果有，是否 IsJDate 是真还是假?

For example, in the following code block I want to know whether the Date property has the Validation attribute or not, and if so, whether IsJDate is true or false?

[Validation(IsJDate=true)]
public string Date {get; set;}

初始化:

filesPath.ToList().ForEach(csFilePath =>
{
    SyntaxTree csSyntaxTree = CSharpSyntaxTree.ParseText(csFileSourceCode);
    // ....
}
_compiledCsCodes = CSharpCompilation.Create("CSClassesAssembly", csFiles.Select(cs => cs.CSSyntaxTree ), references);
foreach (CsFile csFile in csFiles)
{
     csFile.FileSemanticModel = _compiledCsCodes.GetSemanticModel(csFile.FullSyntaxTree);
}

推荐答案

最后，我通过对 Yuriy 的回答进行了一些更改找到了解决方案，如下所示:

Finally, I found the solution by making some changes to Yuriy's answer as following:

foreach (var attribute in node.AttributeLists.SelectMany(al => al.Attributes))
{
    if (csFile.FileSemanticModel.GetTypeInfo(attribute).Type.ToDisplayString() == "Proj.Attributes.ValidationAttribute")
    {
        var arg = attribute.ArgumentList.Arguments.FirstOrDefault(aa => aa.NameEquals.Name.Identifier.Text == "IsJDate");
        if (arg != null && arg.Expression.IsKind(SyntaxKind.TrueLiteralExpression))
            validationKind = ValidationKind.JDate;
    }
}

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