Roslyn:如何获得未解析的类型 [英] Roslyn : How to get unresolved types

问题描述

我使用的是 Roslyn 2012 年 9 月的 CTP.

I am using Roslyn's September 2012 CTP.

在 c# 代码文档中获取未解析类型的最优雅方法是什么?例如.类型 Guid 需要 System 命名空间.目前我有这样的事情:

What is the most elegant way to get unresolved types in a c# code document? Eg. Type Guid requires the System namespace. Currently I have something like this:

            var semanticModel = (SemanticModel)document.GetSemanticModel();
            var tree = (SyntaxTree)document.GetSyntaxTree();

            //get unresolved types
            var unresolvedTypes = tree.GetRoot().DescendantNodes().OfType<IdentifierNameSyntax>()
                .Where(x => semanticModel.GetSymbolInfo(x).Symbol == null);

使用 IdentifierNameSyntax 和 GetSymbolInfo 是否正确?

Is it correct to use IdentifierNameSyntax and GetSymbolInfo?

还有 GetSymbolInfo 和 GetTypeInfo 之间的区别是什么，它们看起来都与我非常相似.

Also what is the difference between GetSymbolInfo and GetTypeInfo, they both look very similar to me.

推荐答案

这里有几个问题.

问:使用IdentifierNameSyntax是否正确?
答:您可能希望使用 SimpleNameSyntax 来处理解析泛型类型.此外，您可能不想查看所有 SimpleNameSyntax 元素.对于实际上不在类型上下文中的事物，您会得到误报(例如，想象一些像 var x = Console();

Q: Is it correct to use IdentifierNameSyntax?
A: You probably want to use SimpleNameSyntax to handle resolving generic types. Also, you may not want to look at ALL SimpleNameSyntax elements. You will get false positives for things that are not actually in a type context (for example, imagine some code like var x = Console();

问:使用 GetSymbolInfo 并检查 null 是否正确?
A:是的，在这里检查是正确的.

Q: Is it correct to use GetSymbolInfo and check for null?
A: Yes, this is the right thing to check here.

问:GetSymbolInfo 和 GetTypeInfo 有什么区别?
A:对于表示类型名称的语法，没有区别.但是，对于任意表达式，GetSymbolInfo 表示表达式的特定符号(例如，方法调用、索引器访问、数组访问、重载运算符等)，GetTypeInfo 表示结果类型(以便在为表达式添加声明时知道要生成什么类型​​).以myString.GetHashCode()"的InvocationExpressionSyntax 为例.GetSymbolInfo 将返回 GetHashCode() 的方法符号，而 GetTypeInfo 将返回 System.Int32.

Q: What is the difference between GetSymbolInfo and GetTypeInfo?
A: For a syntax that represents a type name, there is no difference. However, for arbitrary expressions GetSymbolInfo represents the specific symbol of the expression (for example, method call, indexer access, array access, overloaded operator, etc), and GetTypeInfo represents the resulting type (so that you would know what type to generate if you were adding a declaration for the expression). Take for example the InvocationExpressionSyntax for "myString.GetHashCode()". GetSymbolInfo would return the method symbol for GetHashCode(), while GetTypeInfo would return System.Int32.

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