如何使用Roslyn检查属性是否用自定义属性修饰? [英] How to check if a property is decorated with a custom attribute using Roslyn?
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问题描述
我想使用罗斯林(Roslyn)分析C#类,并打算在访问属性具有特定属性的情况下执行某些操作.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,如果是,则IsJDate
是true还是false?
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的答案进行了如下更改来找到解决方案:
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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