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[Proposal]: Nominal Type Unions

Proposal

Proposal champion

Status: Open.

#9411 In dotnet/csharplang;

· mattwar opened on May 29, 2025

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Needs More Work

[Proposal]: Support optional and named arguments in Expression trees

Proposal

Proposal champion

Status: Open.

#9246 In dotnet/csharplang;

· 333fred opened on Mar 20, 2025

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Working Set

[Proposal]: Support generics and generic type parameters in aliases

Proposal

Proposal champion

Status: Open.

#9245 In dotnet/csharplang;

· 333fred opened on Mar 20, 2025

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Backlog

[Proposal]: Expression blocks

Proposal

Proposal champion

Status: Open.

#9243 In dotnet/csharplang;

· 333fred opened on Mar 20, 2025

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Working Set

[Proposal]: Require await to apply nullable postconditions to task-returning calls

Proposal

Proposal champion

Status: Open.

#8679 In dotnet/csharplang;

· RikkiGibson opened on Nov 22, 2024

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Needs More Work

[Proposal]: Null conditional assignment

Proposal

Proposal champion

Status: Open.

#8677 In dotnet/csharplang;

· RikkiGibson opened on Nov 22, 2024

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Working Set

[Proposal]: Delegate Type Arguments Improvements

Proposal

Proposal champion

Status: Open.

#8675 In dotnet/csharplang;

· RikkiGibson opened on Nov 22, 2024

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Backlog

[Proposal]: Overload Resolution Priority (VS 17.12, .NET 9)

Implemented Needs ECMA SpecThis feature has been implemented in C#, but still needs to be merged into the ECMA specificationThis feature has been implemented in C#, but still needs to be merged into the ECMA specification

Proposal

Proposal champion

Status: Open.

#7706 In dotnet/csharplang;

· 333fred opened on Nov 19, 2023

 ·  

13.0

[Proposal]: Params Collections (VS 17.10, .NET 9)

Implemented Needs ECMA SpecThis feature has been implemented in C#, but still needs to be merged into the ECMA specificationThis feature has been implemented in C#, but still needs to be merged into the ECMA specification

Proposal

Proposal champion

Status: Open.

#7700 In dotnet/csharplang;

· MadsTorgersen opened on Nov 16, 2023

 ·  

13.0

[Proposal]: Let ref structs implement interfaces and substitute into type parameters (VS 17.11, .NET 9)

Implemented Needs ECMA SpecThis feature has been implemented in C#, but still needs to be merged into the ECMA specificationThis feature has been implemented in C#, but still needs to be merged into the ECMA specification

Proposal

Proposal champion

Status: Open.

#7608 In dotnet/csharplang;

· agocke opened on Oct 18, 2023

 ·  

13.0

[Proposal]: Inline arrays (VS 17.7, .NET 8)

Implemented Needs ECMA SpecThis feature has been implemented in C#, but still needs to be merged into the ECMA specificationThis feature has been implemented in C#, but still needs to be merged into the ECMA specification

Proposal

Proposal champion

Status: Open.

#7431 In dotnet/csharplang;

· jcouv opened on Aug 8, 2023

 ·  

12.0

[Proposal]: Method group natural type improvements (VS 17.9, .NET 9)

Implemented Needs ECMA SpecThis feature has been implemented in C#, but still needs to be merged into the ECMA specificationThis feature has been implemented in C#, but still needs to be merged into the ECMA specification

Proposal

Proposal champion

Status: Open.

#7429 In dotnet/csharplang;

· jcouv opened on Aug 8, 2023

 ·  

13.0