[英]Add a parameter to a method with a Roslyn CodeFixProvider
I'm writing a Roslyn Code Analyzer that I want to identify if an async
method does not take a CancellationToken
and then suggest a code fix that adds it: 我正在编写一个Roslyn代码分析器 ,我想识别
async
方法是否不采用CancellationToken
然后建议添加它的代码修复:
//Before Code Fix:
public async Task Example(){}
//After Code Fix
public async Task Example(CancellationToken token){}
I've wired up the DiagnosticAnalyzer
to correctly report a Diagnostic by inspecting the methodDeclaration.ParameterList.Parameters
, but I can't find the Roslyn API for adding a Paramater
to the ParameterList
inside a CodeFixProvider
. 我已经通过检查
methodDeclaration.ParameterList.Parameters
来连接DiagnosticAnalyzer
来正确报告Diagnostic,但是我找不到Roslyn API来将Paramater
添加到CodeFixProvider
的ParameterList
。
This is what I've got so far: 这是我到目前为止所得到的:
private async Task<Document> HaveMethodTakeACancellationTokenParameter(
Document document, SyntaxNode syntaxNode, CancellationToken cancellationToken)
{
var method = syntaxNode as MethodDeclarationSyntax;
// what goes here?
// what I want to do is:
// method.ParameterList.Parameters.Add(
new ParameterSyntax(typeof(CancellationToken));
//somehow return the Document from method
}
How do I correctly update the Method Declaration and return the updated Document
? 如何正确更新方法声明并返回更新的
Document
?
@Nate Barbettini is correct, syntax nodes are all immutable, so I needed to create a new version of the MethodDeclarationSyntax
, then replace the old method with the new method in the document
's SyntaxTree
: @Nate Barbettini是正确的,语法节点都是不可变的,所以我需要创建一个新版本的
MethodDeclarationSyntax
,然后用document
的SyntaxTree
的new方法替换旧方法:
private async Task<Document> HaveMethodTakeACancellationTokenParameter(
Document document, SyntaxNode syntaxNode, CancellationToken cancellationToken)
{
var method = syntaxNode as MethodDeclarationSyntax;
var updatedMethod = method.AddParameterListParameters(
SyntaxFactory.Parameter(
SyntaxFactory.Identifier("cancellationToken"))
.WithType(SyntaxFactory.ParseTypeName(typeof (CancellationToken).FullName)));
var syntaxTree = await document.GetSyntaxTreeAsync(cancellationToken);
var updatedSyntaxTree =
syntaxTree.GetRoot().ReplaceNode(method, updatedMethod);
return document.WithSyntaxRoot(updatedSyntaxTree);
}
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