Roslyn-替换节点并修复空白 [英] Roslyn - replace node and fix the whitespaces

问题描述

在我的程序中，我使用Roslyn，并且需要用新节点替换一个节点。例如，如果我有这样的代码

In my program I use Roslyn and I need to replace a node with a new node. For example, if I have code like

public void Foo()
{
   for(var i = 0; i < 5; i++)
      Console.WriteLine("");
}

我想插入括号以供声明，我得到

and I want to insert brackes for for statement, I get

public void Foo()
{
   for(var i = 0; i < 5; i++)
{
      Console.WriteLine("");
}
}

我尝试使用NormalizeWhitespace，但是如果使用它在声明中，我得到

I tried to use NormalizeWhitespace, but if I use it on for statement, I get

public void Foo()
{
for(var i = 0; i < 5; i++)
{
   Console.WriteLine("");
}
}

但是，我想将语句格式化正确地。

However, I'd like to have for statement formatted correctly. Any hints how to do it?

编辑：
我使用以下方法解决了这个问题：

I solved it by using:

var blockSyntax = SyntaxFactory.Block(
            SyntaxFactory.Token(SyntaxKind.OpenBraceToken).WithLeadingTrivia(forStatementSyntax.GetLeadingTrivia()).WithTrailingTrivia(forStatementSyntax.GetTrailingTrivia()),
            syntaxNodes,
            SyntaxFactory.Token(SyntaxKind.CloseBraceToken).WithLeadingTrivia(forStatementSyntax.GetLeadingTrivia()).WithTrailingTrivia(forStatementSyntax.GetTrailingTrivia())
);

但是，Sam的答案也是正确的。

However, the answer from Sam is also correct.

推荐答案

您需要在要格式化的特定元素上使用 .WithAdditionalAnnotations（Formatter.Annotation）。这是来自 NullParameterCheckRefactoring 项目的示例。

You need to use .WithAdditionalAnnotations(Formatter.Annotation), but only on the specific element you want to format. Here's an example from the NullParameterCheckRefactoring project.

IfStatementSyntax nullCheckIfStatement = SyntaxFactory.IfStatement(
    SyntaxFactory.Token(SyntaxKind.IfKeyword),
    SyntaxFactory.Token(SyntaxKind.OpenParenToken),
    binaryExpression, 
    SyntaxFactory.Token(SyntaxKind.CloseParenToken), 
    syntaxBlock, null).WithAdditionalAnnotations(Formatter.Annotation, Simplifier.Annotation);

这篇关于Roslyn-替换节点并修复空白的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！