[英]Adding class members into specific locations using Roslyn?
I'm using ClassDeclarationSyntax.AddMembers()
to add methods to the class.我正在使用
ClassDeclarationSyntax.AddMembers()
向类添加方法。 The method appears in the class, but I would like to know how to add the method to a specific place.该方法出现在类中,但我想知道如何将方法添加到特定位置。 As of now, they are added to the
#if
directive at the end of the class.到目前为止,它们被添加到类末尾的
#if
指令中。
Roslyn version: 4.4.0罗斯林版本:4.4.0
Running the code:运行代码:
var tree = CSharpSyntaxTree.ParseText(@"
namespace Test
{
public class A
{
#if !SILVERLIGHT
public int someField;
#endif
}
}");
var classNode = tree.GetRoot().DescendantNodes().OfType<ClassDeclarationSyntax>().First();
var previousWhiteSpacesToken =
SyntaxFactory.Token(SyntaxTriviaList.Empty, SyntaxKind.None, SyntaxTriviaList.Empty);
var method = SyntaxFactory.MethodDeclaration( //
SyntaxFactory.PredefinedType( //
SyntaxFactory.Token(SyntaxKind.IntKeyword)), "CalculateSize") //
.WithModifiers(SyntaxTokenList.Create(previousWhiteSpacesToken)
.Add(SyntaxFactory.Token(SyntaxKind.PublicKeyword))) //
.WithBody(SyntaxFactory.Block()).NormalizeWhitespace();
var newClassNode = classNode.AddMembers(method).NormalizeWhitespace();
Console.WriteLine(newClassNode.ToString());
This result will be obtained:会得到这样的结果:
public class A
{
#if !SILVERLIGHT
public int someField;
public int CalculateSize()
{
}
#endif
}
I know that there is a way to do this, but this result can only guarantee correctness:我知道有办法做到这一点,但这个结果只能保证正确性:
public class A
{
public int CalculateSize()
{
}
#if !SILVERLIGHT
public int someField;
#endif
}
I expected this result:我期待这个结果:
public class A
{
#if !SILVERLIGHT
public int someField;
#endif
public int CalculateSize()
{
}
}
The problem here is that #endif
is the leading trivia of }
that closes the class declaration.这里的问题是
#endif
是关闭类声明的}
的主要琐事。 So, when you just add a member, the #endif
remains as the leading trivia of }
.因此,当您只添加一个成员时,
#endif
仍然是}
的主要琐事。
What you need to do is to move the leading trivia of }
to be the leading trivia of the new method you are adding.您需要做的是将
}
的主要琐事移动为您要添加的新方法的主要琐事。
Here is the modified version of your code:这是您的代码的修改版本:
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
var tree = CSharpSyntaxTree.ParseText(@"
namespace Test
{
public class A
{
#if !SILVERLIGHT
public int someField;
#endif
}
}");
var classNode = tree.GetRoot().DescendantNodes().OfType<ClassDeclarationSyntax>().First();
var previousWhiteSpacesToken =
SyntaxFactory.Token(SyntaxTriviaList.Empty, SyntaxKind.None, SyntaxTriviaList.Empty);
var method = SyntaxFactory.MethodDeclaration( //
SyntaxFactory.PredefinedType( //
SyntaxFactory.Token(SyntaxKind.IntKeyword)), "CalculateSize") //
.WithModifiers(SyntaxTokenList.Create(previousWhiteSpacesToken)
.Add(SyntaxFactory.Token(SyntaxKind.PublicKeyword))) //
.WithBody(SyntaxFactory.Block())
.WithLeadingTrivia(classNode.CloseBraceToken.LeadingTrivia).NormalizeWhitespace(); // copy '}' leading trivia to the new method.
// remove leading trivia from '}', they are moved previously to the new method.
var newClassNode = classNode.WithCloseBraceToken(classNode.CloseBraceToken.WithLeadingTrivia()).AddMembers(method).NormalizeWhitespace();
Console.WriteLine(newClassNode.ToString());
This prints the following (exactly your expectation):这将打印以下内容(正是您的期望):
public class A
{
#if !SILVERLIGHT
public int someField;
#endif
public int CalculateSize()
{
}
}
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