Signature help not offered in positional pattern.

描述

public class Point
{
    public int X;
    public int Y;
    public void Deconstruct(out int XX, out int YY) => throw null;
    void M()
    {
        object o = null;
        if (o is Point($)) // <-- i should get sighelp here to make it clear what is being matched
        {

        }
    }
}

贡献者指南

技术栈

csharp

领域

developer experiencetooling

议题类型

feature

难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。

4

预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。

1-2 days

活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。

stale

清晰度议题是否清楚说明期望改动、验收标准和下一步。

clear

前置要求

C# knowledgefamiliarity with Roslyn syntax

新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。

20

研究方向

Examine the existing signature help providers in the Roslyn EditorFeatures layer, particularly for pattern matching constructs. The issue requests that when typing a positional pattern like `is Point($)`, signature help should show the parameters of `Deconstruct`. Look at how signature help is triggered for deconstruction in other contexts (e.g., variable declarations). Investigate the `ISignatureHelpProvider` implementations and the syntax handling for positional patterns. The maintainers may have provided guidance in the issue comments.