dotnet/roslyn

VB Editor IntelliSense does not show Task's members in ContinueWith

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#8,482 创建于 2016年2月9日

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 (0 评论) (0 反应) (0 负责人)C# (20,414 star) (4,257 fork)batch import
Area-CompilersBughelp wanted

描述

This item was filed by a customer. Please communicate and close the loop with your customer via the customer tab inside TFS.

Problem Description

Description: I have the following VB code:

 Public Class Form1 

 Private Sub OnTest() Handles Button1.Click 

 Dim t = Task.Factory.StartNew(Function() 5) 
 t.ContinueWith(Sub(ant) MsgBox(ant.Result)) 

 End Sub 

 End Class

This code compiles perfectly, but there's one bug: as soon as I type MsgBox(ant., then IntelliSense treats ant as Object - and hence doesn't show me Task's members - only Object's one.

Repro Steps:Code

 Private Sub OnTest() Handles Button1.Click 

 Dim t = Task.Factory.StartNew(Function() 5) 
 t.ContinueWith(Sub(ant) MsgBox(ant.Result)) 

 End Sub

Impact:IntelliSense treats "ant" variable as Object.

贡献者指南

技术栈
无
领域
tooling
议题类型
bug
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。
3
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
Understanding VB.NET type inferenceFamiliarity with Roslyn completion provider
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。
25
研究方向
Investigate how Roslyn's IntelliSense handles lambda parameters in VB.NET, specifically for ContinueWith. Look at the completion provider for lambda parameter types, possibly in src/Features/LanguageServer or src/EditorFeatures. Check if the parameter 'ant' is correctly inferred as Task(Of Integer) from the antecedent. The issue may involve the type inference of lambda parameters in VB when chaining Task methods. Start by searching for relevant code in the Roslyn repository that handles VB completion for lambda expressions.