我有这个工作代码,将.cs文件加载到Roslyn SyntaxTree类中,创建一个新的PropertyDeclarationSyntax,将其插入到类中,并重新写入.cs文件.我正在做这个学习经验以及一些潜在的未来想法.我发现在任何地方似乎都不是一个完整的Roslyn API文档,我不确定我是否有效地执行此操作.我主要关心的是我所说的“root.ToFullString()”,而它的工作原理是这样做的正确方法？
using System.IO;
using System.Linq;
using Roslyn.Compilers;
using Roslyn.Compilers.CSharp;
class RoslynWrite
{
public RoslynWrite()
{
const string csFile = "MyClass.cs";
// Parse .cs file using Roslyn SyntaxTree
var SyntaxTree = SyntaxTree.ParseFile(csFile);
var root = SyntaxTree.GetRoot();
// Get the first class from the Syntax tree
var myClass = root.DescendantNodes().OfType<ClassDeclarationSyntax>().First();
// Create a new property : 'public bool MyProperty { get; set; }'
var myProperty = Syntax.PropertyDeclaration(Syntax.ParseTypeName("bool"),"MyProperty")
.WithModifiers(Syntax.Token(SyntaxKind.PublicKeyword))
.WithAccessorList(
Syntax.AccessorList(Syntax.List(
Syntax.AccessorDeclaration(SyntaxKind.GetAccessorDeclaration)
.WithSemicolonToken(Syntax.Token(SyntaxKind.SemicolonToken)),Syntax.AccessorDeclaration(SyntaxKind.SetAccessorDeclaration)
.WithSemicolonToken(Syntax.Token(SyntaxKind.SemicolonToken)))));
// Add the new property to the class
var updatedClass = myClass.AddMembers(myProperty);
// Update the SyntaxTree and normalize whitespace
var updatedRoot = root.ReplaceNode(myClass,updatedClass).NormalizeWhitespace();
// Is this the way to write the Syntax tree? ToFullString?
File.WriteAllText(csFile,updatedRoot.ToFullString());
}
}
解决方法
回答Roslyn CTP论坛
in this post：
That approach is generally fine,though if you are worried about allocating a string for the text of the entire file,you should probably use IText.Write(TextWriter) instead of ToFullString().
Keep in mind that it’s possible to generate trees that will not round-trip through the parser. For example,if you generated something that violates precedence rules,the SyntaxTree construction APIs won’t catch that.
