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[英]Add access modifier to method using Roslyn CodeFixProvider?
[英]Roslyn Rewrite Method Calls to use await Modifier
我有一堆C#文件,我想遷移到用於開發的內部框架的新版本。 到目前為止,我已經能夠完成某些事情,但是有一個特殊的方法調用,我必須對其進行修改才能使用await修飾符,並且方法調用具有不同的風味,如下所示
var a = EntityService.GetBy(Entities.INSTANT_ISSUANCE_REQUEST, requestFilter);
var b = EntityService.GetBy(Entities.ISSUANCE_SETTINGS, new DejaVuObject()).FirstOrDefault();
我必須修改上述方法調用,以便它們使用以下語法
var a = await EntityService.GetBy(Entities.INSTANT_ISSUANCE_REQUEST, requestFilter);
var b = await EntityService.GetBy(Entities.ISSUANCE_SETTINGS, new DejaVuObject()).FirstOrDefault();
我正在使用Roslyn CSharpSyntaxWriter遍歷語法樹。
public override SyntaxNode VisitLocalDeclarationStatement(LocalDeclarationStatementSyntax node)
{
var variableDeclarations =
from i in node.DescendantNodes().OfType<VariableDeclaratorSyntax>()
where i.DescendantNodes().OfType<EqualsValueClauseSyntax>().Any<EqualsValueClauseSyntax>(
p => p.DescendantNodes().OfType<InvocationExpressionSyntax>().Any<InvocationExpressionSyntax>())
select i;
foreach (var syntax in variableDeclarations)
{
var equalsToken = syntax.DescendantNodes();
//now we have the equals token
foreach (var syntaxNode in equalsToken)
{
if (syntaxNode is EqualsValueClauseSyntax)
{
var equalsValueSyntax = syntaxNode.DescendantNodes().OfType<InvocationExpressionSyntax>();
foreach (var invocationExpressionSyntax in equalsValueSyntax)
{
var simpleMemberAcessExpressions = invocationExpressionSyntax
.DescendantNodes()
.OfType<IdentifierNameSyntax>()
.Where(i => i.Identifier.Text == "EntityService");
foreach (var simpleMemberAcessExpression in simpleMemberAcessExpressions)
{
var newExpression = $"{invocationExpressionSyntax.ToFullString()}";
Console.WriteLine(newExpression);
//TODO: Modify the Node
}
}
}
}
}
return base.VisitLocalDeclarationStatement(node);
}
我的問題是控制台中的輸出有些重復
EntityService.GetBy(Entities.ISSUANCE_SETTINGS, new DejaVuObject()).FirstOrDefault();
EntityService.GetBy(Entities.ISSUANCE_SETTINGS, new DejaVuObject())
兩者都引用相同的InvocationExpression
但是由於FirstOrDefault()
它在控制台輸出中顯示兩次
我想要一種過濾結果的方法,以便它們僅包含唯一的方法調用,並通過添加await修飾符並更新節點來執行方法調用的實際修改。
首先,為什么要覆蓋VisitLocalDeclarationStatement
? 看來您應該重寫VisitInvocationExpression
。
您不應該這樣做:
var simpleMemberAcessExpressions =
invocationExpressionSyntax.DescendantNodes().OfType<IdentifierNameSyntax>()
相反,它應該類似於:
var identifier =
(node.Expression as MemberAccessExpressionSyntax)?.Expression as IdentifierNameSyntax;
if (identifier != null && identifier.Identifier.Text == "EntityService")
{
// process the invocation expression
}
假設調用表達式稱為node
,則新表達式可能是
var newExpression =
SyntaxFactory.ParenthesizedExpression(SyntaxFactory.AwaitExpression(node))
.WithAdditionalAnnotations(Simplifier.Annotation)
.WithAdditionalAnnotations(Formatter.Annotation);
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