如何把ExpressionStatementSyntax到ParenthesizedExpressionSyntax（把周圍的表達括號）

Question

假設我有"".GetType()這是在語法樹ExpressionStatementSyntax（或者InvocationExpressionSyntax），我希望把它變成("".GetType())，那就是我希望把我的ExpressionStatementSyntax節點成ParenthesizedExpressionSyntax節點。我會怎麼做？

Answer 1

using System; 
using System.Linq; 
using Roslyn.Compilers; 
using Roslyn.Compilers.CSharp; 

class Program 
{ 
    static void Main(string[] args) 
    { 
     var oldRootNode = Syntax.ParseCompilationUnit(
      "class C { void M() { \"\".GetType(); } }"); 
     var oldStatementNode = oldRootNode.DescendantNodes().OfType<ExpressionStatementSyntax>().First(); 
     var oldExpressionNode = oldStatementNode.Expression; 
     var newExpressionNode = Syntax.ParenthesizedExpression(oldExpressionNode); 
     var newRootNode = oldRootNode.ReplaceNode(oldExpressionNode, newExpressionNode); 
     Console.WriteLine(oldRootNode.ToString()); 
     Console.WriteLine(newRootNode.ToString()); 
    } 
}