c# – Roslyn – 如何在匹配InvocationExpressionSyntax之后添加

_container.RegisterInstance(NavigationService);

然后我想在上面的行之后添加以下语句：

_container.RegisterInstance<ISessionStateService>(SessionStateService);
_container.RegisterInstance<IFlyoutService>(FlyoutService);

任何帮助将不胜感激.

编辑:(我已经创建了表达式,但现在如何将这两个表达添加到我的targetExpression？

string strContent = File.ReadAllText(strPath);
        SyntaxTree tree = SyntaxTree.ParseText(strContent);
        var targetExpression = tree.GetRoot().DescendantNodes().OfType<InvocationExpressionSyntax>()
                .FirstOrDefault(
                    x => x.Expression.ToString().Contains("_container.RegisterInstance") && x.ArgumentList.ToString().Contains("NavigationService"));

        InvocationExpressionSyntax replacementNode1 =
            Syntax.InvocationExpression(Syntax.ParseExpression(@"_container.RegisterInstance<ISessionStateService>(SessionStateService);"));

        InvocationExpressionSyntax replacementNode2 =
           Syntax.InvocationExpression(Syntax.ParseExpression(@"_container.RegisterInstance<IFlyoutService>(FlyoutService);"));

        MethodDeclarationSyntax targetMethod = (MethodDeclarationSyntax)targetExpression.Parent.Parent.Parent;

        List<InvocationExpressionSyntax> list = targetMethod.DescendantNodes().OfType<InvocationExpressionSyntax>().ToList();
        int index = list.IndexOf(targetExpression);

        list.Insert(index + 1,replacementNode1);
        list.Insert(index + 1,replacementNode2);

现在问题是如何获取我更新的树？意味着如何更新我的列表并使用这些更改获取树.

编辑：现在我能够生成添加节点,但只有问题是格式化..间距不正确.这是代码：

string strContent = File.ReadAllText(strPath);
        SyntaxTree tree = SyntaxTree.ParseText(strContent);

        ExpressionStatementSyntax expressionStatementSyntax =
            Syntax.ExpressionStatement(Syntax.ParseExpression("_container.RegisterInstance(NavigationService);"));

        var targetBlock =
            tree.GetRoot()
                .DescendantNodes()
                .OfType<BlockSyntax>()
                .FirstOrDefault(x => x.Statements.Any(y => y.ToString().Contains("_container.RegisterInstance")));

        StatementSyntax syn1 =
            Syntax.ParseStatement(@"_container.RegisterInstance<ISessionStateService>(SessionStateService);");
        StatementSyntax syn2 = Syntax.ParseStatement(@"_container.RegisterInstance<ISessionStateService>(SessionStateService2);");

        List<StatementSyntax> newSynList = new List<StatementSyntax> { syn1,syn2 };

        SyntaxList<StatementSyntax> blockWithNewStatements = targetBlock.Statements;

        foreach (var syn in newSynList)
        {
            blockWithNewStatements = blockWithNewStatements.Insert(1,syn);
        }

        BlockSyntax newBlock = Syntax.Block(blockWithNewStatements);

        var newRoot = tree.GetRoot().ReplaceNode(targetBlock,newBlock);

它生成输出所有行左对齐..任何建议？