dotnet/runtime Issues | Good First Issue

Stars: (17,886 stars)
Forks: (5,445 forks)
Indexed issues: (385 indexed issues)
open beginner issues: (368 open beginner issues)
Latest indexed: Jun 11, 2026
Last GitHub push: May 15, 2026
License: MIT License
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Dominant language: C#
PR merge metrics: (Avg merge 12d 11h) (661 merged PRs in 30d)
Beginner labels: help wantedgood first issue

Loading repository issues...

Issues

368 open indexed issues

Open

NullabilityInfoContext returns incorrect results for an indexer parameter if the class has a property with a value type return type.

area-System.Reflectionbughelp wanted

dotnet/runtime #101,071 opened Apr 15, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

Open

LdapConnection.GetPartialResults() fails with timeout in Linux

area-System.DirectoryServiceshelp wanted

dotnet/runtime #100,442 opened Mar 29, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

Linux System.DirectoryServices.Protocols: does the library support multiple server connection?

area-System.DirectoryServiceshelp wanted

dotnet/runtime #100,007 opened Mar 20, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

4 comments1 reaction0 assignees

Open

Consider using process snapshotting APIs for System.Diagnostics.Process

area-System.Diagnostics.Processhelp wantedos-windowstenet-performance

dotnet/runtime #99,906 opened Mar 18, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

13 comments6 reactions0 assignees

Open

Optimize some trivial comparison patterns for unsigned integer types

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #99,757 opened Mar 14, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

3 comments0 reactions0 assignees

Open

JsonSerializer deserialization using overloads taking Utf8JsonReader are unexpectedly slower than equivalents taking string

area-System.Text.Jsonhelp wantedtenet-performance

dotnet/runtime #99,674 opened Mar 13, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

5 comments1 reaction0 assignees

Open

Add package readmes to shipping libraries packages

area-Metadocumentationhelp wanted

dotnet/runtime #99,358 opened Mar 6, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments4 reactions0 assignees

Open

Recognize Shift(vec, vec(8)) and replace with Shift(vec, 8)

area-CodeGen-coreclrhelp wanted

dotnet/runtime #99,009 opened Feb 27, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

Open

dump system log on macos when test run terminates unexpectedly

area-Infrastructure-librarieshelp wanted

dotnet/runtime #98,132 opened Feb 7, 2024 · C# · 17,886 stars

Why recommendedHas a beginner-friendly label · Contributing guide available

Has a beginner-friendly labelContributing guide available

5 comments0 reactions1 assignee

Open

System.IO.Ports.SerialPort.Close() ignores disabled HUPCL flag on Linux

area-System.IO.Portshelp wanted

dotnet/runtime #97,741 opened Jan 31, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

Open

SerialStream discards 'numBytes', resulting in data loss

area-System.IO.Portshelp wanted

dotnet/runtime #97,549 opened Jan 26, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

3 comments1 reaction0 assignees

Open

ILVerification fails unexpected on delegate construction with instance method

area-Tools-ILVerificationhelp wanted

dotnet/runtime #96,695 opened Jan 9, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

4 comments0 reactions0 assignees

Open

Linux: `System.Diagnostics.ProcessStartInfo`: With `UseShellExecute = true`, a misleading exception is thrown when no helper utility (such as `xdg-open`) is present.

area-System.Diagnostics.Processhelp wantedin-pr

dotnet/runtime #96,565 opened Jan 5, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

Open

.net 8, HttpClient, adding ssl cert after first use, the cert does not get used

area-System.Net.Httpdocumentationhelp wanted

dotnet/runtime #96,494 opened Jan 4, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

18 comments0 reactions0 assignees

Open

Investigate optimizing some OrderBy().Take calls to use a PriorityQueue

area-System.Linqhelp wantedtenet-performance

dotnet/runtime #96,277 opened Dec 22, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

12 comments6 reactions0 assignees

Open

`SerialPort.Write()` does not block until all data is written.

area-System.IO.Portshelp wanted

dotnet/runtime #96,267 opened Dec 22, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

5 comments0 reactions0 assignees

Open

UnixDomainSocketEndPoint no longer constructable on iOS (.NET 8)

area-System.Netgood first issueos-ios

dotnet/runtime #96,143 opened Dec 18, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

6 comments0 reactions0 assignees

Open

JIT: missing opportunities in constant folding around bitwise ops

area-CodeGen-coreclrhelp wantedin-pr

dotnet/runtime #95,747 opened Dec 7, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

3 comments0 reactions0 assignees

Open

Console.IsInputRedirected returns true on git bash when there is no redirected input

area-System.Consolehelp wanted

dotnet/runtime #95,079 opened Nov 21, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

10 comments0 reactions0 assignees

Open

[API Proposal]: Add `BindingFlags.IgnoreAccessModifiers`

api-approvedarea-System.Reflectioncode-analyzercode-fixerhelp wanted

dotnet/runtime #94,536 opened Nov 8, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

27 comments30 reactions0 assignees

Stars: (17,886 stars)
Forks: (5,445 forks)
Indexed issues: (385 indexed issues)
open beginner issues: (368 open beginner issues)
Latest indexed: Jun 11, 2026
Last GitHub push: May 15, 2026
License: MIT License
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Dominant language: C#
PR merge metrics: (Avg merge 12d 11h) (661 merged PRs in 30d)
Beginner labels: help wantedgood first issue

Issues

368 open indexed issues

RSS Atom

Open

NullabilityInfoContext returns incorrect results for an indexer parameter if the class has a property with a value type return type.

area-System.Reflectionbughelp wanted

dotnet/runtime #101,071 opened Apr 15, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

Open

LdapConnection.GetPartialResults() fails with timeout in Linux

area-System.DirectoryServiceshelp wanted

dotnet/runtime #100,442 opened Mar 29, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

Linux System.DirectoryServices.Protocols: does the library support multiple server connection?

area-System.DirectoryServiceshelp wanted

dotnet/runtime #100,007 opened Mar 20, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

4 comments1 reaction0 assignees

Open

Consider using process snapshotting APIs for System.Diagnostics.Process

area-System.Diagnostics.Processhelp wantedos-windowstenet-performance

dotnet/runtime #99,906 opened Mar 18, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

13 comments6 reactions0 assignees

Open

Optimize some trivial comparison patterns for unsigned integer types

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #99,757 opened Mar 14, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

3 comments0 reactions0 assignees

Open

JsonSerializer deserialization using overloads taking Utf8JsonReader are unexpectedly slower than equivalents taking string

area-System.Text.Jsonhelp wantedtenet-performance

dotnet/runtime #99,674 opened Mar 13, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

5 comments1 reaction0 assignees

Open

Add package readmes to shipping libraries packages

area-Metadocumentationhelp wanted

dotnet/runtime #99,358 opened Mar 6, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments4 reactions0 assignees

Open

Recognize Shift(vec, vec(8)) and replace with Shift(vec, 8)

area-CodeGen-coreclrhelp wanted

dotnet/runtime #99,009 opened Feb 27, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

Open

dump system log on macos when test run terminates unexpectedly

area-Infrastructure-librarieshelp wanted

dotnet/runtime #98,132 opened Feb 7, 2024 · C# · 17,886 stars

Why recommendedHas a beginner-friendly label · Contributing guide available

Has a beginner-friendly labelContributing guide available

5 comments0 reactions1 assignee

Open

System.IO.Ports.SerialPort.Close() ignores disabled HUPCL flag on Linux

area-System.IO.Portshelp wanted

dotnet/runtime #97,741 opened Jan 31, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

Open

SerialStream discards 'numBytes', resulting in data loss

area-System.IO.Portshelp wanted

dotnet/runtime #97,549 opened Jan 26, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

3 comments1 reaction0 assignees

Open

ILVerification fails unexpected on delegate construction with instance method

area-Tools-ILVerificationhelp wanted

dotnet/runtime #96,695 opened Jan 9, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

4 comments0 reactions0 assignees

Open

Linux: `System.Diagnostics.ProcessStartInfo`: With `UseShellExecute = true`, a misleading exception is thrown when no helper utility (such as `xdg-open`) is present.

area-System.Diagnostics.Processhelp wantedin-pr

dotnet/runtime #96,565 opened Jan 5, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

Open

.net 8, HttpClient, adding ssl cert after first use, the cert does not get used

area-System.Net.Httpdocumentationhelp wanted

dotnet/runtime #96,494 opened Jan 4, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

18 comments0 reactions0 assignees

Open

Investigate optimizing some OrderBy().Take calls to use a PriorityQueue

area-System.Linqhelp wantedtenet-performance

dotnet/runtime #96,277 opened Dec 22, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

12 comments6 reactions0 assignees

Open

`SerialPort.Write()` does not block until all data is written.

area-System.IO.Portshelp wanted

dotnet/runtime #96,267 opened Dec 22, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

5 comments0 reactions0 assignees

Open

UnixDomainSocketEndPoint no longer constructable on iOS (.NET 8)

area-System.Netgood first issueos-ios

dotnet/runtime #96,143 opened Dec 18, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

6 comments0 reactions0 assignees

Open

JIT: missing opportunities in constant folding around bitwise ops

area-CodeGen-coreclrhelp wantedin-pr

dotnet/runtime #95,747 opened Dec 7, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

3 comments0 reactions0 assignees

Open

Console.IsInputRedirected returns true on git bash when there is no redirected input

area-System.Consolehelp wanted

dotnet/runtime #95,079 opened Nov 21, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

10 comments0 reactions0 assignees

Open

[API Proposal]: Add `BindingFlags.IgnoreAccessModifiers`

api-approvedarea-System.Reflectioncode-analyzercode-fixerhelp wanted

dotnet/runtime #94,536 opened Nov 8, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

27 comments30 reactions0 assignees

Stars: (17,886 stars)
Forks: (5,445 forks)
Indexed issues: (385 indexed issues)
open beginner issues: (368 open beginner issues)
Latest indexed: Jun 11, 2026
Last GitHub push: May 15, 2026
License: MIT License
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Dominant language: C#
PR merge metrics: (Avg merge 12d 11h) (661 merged PRs in 30d)
Beginner labels: help wantedgood first issue

Loading repository issues...

Issues

368 open indexed issues

RSS Atom

Open

NullabilityInfoContext returns incorrect results for an indexer parameter if the class has a property with a value type return type.

area-System.Reflectionbughelp wanted

dotnet/runtime #101,071 opened Apr 15, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

Open

LdapConnection.GetPartialResults() fails with timeout in Linux

area-System.DirectoryServiceshelp wanted

dotnet/runtime #100,442 opened Mar 29, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

1 comment0 reactions0 assignees

Open

Linux System.DirectoryServices.Protocols: does the library support multiple server connection?

area-System.DirectoryServiceshelp wanted

dotnet/runtime #100,007 opened Mar 20, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

4 comments1 reaction0 assignees

Open

Consider using process snapshotting APIs for System.Diagnostics.Process

area-System.Diagnostics.Processhelp wantedos-windowstenet-performance

dotnet/runtime #99,906 opened Mar 18, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

13 comments6 reactions0 assignees

Open

Optimize some trivial comparison patterns for unsigned integer types

area-CodeGen-coreclrhelp wantedtenet-performance

dotnet/runtime #99,757 opened Mar 14, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

3 comments0 reactions0 assignees

Open

JsonSerializer deserialization using overloads taking Utf8JsonReader are unexpectedly slower than equivalents taking string

area-System.Text.Jsonhelp wantedtenet-performance

dotnet/runtime #99,674 opened Mar 13, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

5 comments1 reaction0 assignees

Open

Add package readmes to shipping libraries packages

area-Metadocumentationhelp wanted

dotnet/runtime #99,358 opened Mar 6, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments4 reactions0 assignees

Open

Recognize Shift(vec, vec(8)) and replace with Shift(vec, 8)

area-CodeGen-coreclrhelp wanted

dotnet/runtime #99,009 opened Feb 27, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

Open

dump system log on macos when test run terminates unexpectedly

area-Infrastructure-librarieshelp wanted

dotnet/runtime #98,132 opened Feb 7, 2024 · C# · 17,886 stars

Why recommendedHas a beginner-friendly label · Contributing guide available

Has a beginner-friendly labelContributing guide available

5 comments0 reactions1 assignee

Open

System.IO.Ports.SerialPort.Close() ignores disabled HUPCL flag on Linux

area-System.IO.Portshelp wanted

dotnet/runtime #97,741 opened Jan 31, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

Open

SerialStream discards 'numBytes', resulting in data loss

area-System.IO.Portshelp wanted

dotnet/runtime #97,549 opened Jan 26, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

3 comments1 reaction0 assignees

Open

ILVerification fails unexpected on delegate construction with instance method

area-Tools-ILVerificationhelp wanted

dotnet/runtime #96,695 opened Jan 9, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

4 comments0 reactions0 assignees

Open

Linux: `System.Diagnostics.ProcessStartInfo`: With `UseShellExecute = true`, a misleading exception is thrown when no helper utility (such as `xdg-open`) is present.

area-System.Diagnostics.Processhelp wantedin-pr

dotnet/runtime #96,565 opened Jan 5, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

2 comments0 reactions0 assignees

Open

.net 8, HttpClient, adding ssl cert after first use, the cert does not get used

area-System.Net.Httpdocumentationhelp wanted

dotnet/runtime #96,494 opened Jan 4, 2024 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

18 comments0 reactions0 assignees

Open

Investigate optimizing some OrderBy().Take calls to use a PriorityQueue

area-System.Linqhelp wantedtenet-performance

dotnet/runtime #96,277 opened Dec 22, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

12 comments6 reactions0 assignees

Open

`SerialPort.Write()` does not block until all data is written.

area-System.IO.Portshelp wanted

dotnet/runtime #96,267 opened Dec 22, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

5 comments0 reactions0 assignees

Open

UnixDomainSocketEndPoint no longer constructable on iOS (.NET 8)

area-System.Netgood first issueos-ios

dotnet/runtime #96,143 opened Dec 18, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

6 comments0 reactions0 assignees

Open

JIT: missing opportunities in constant folding around bitwise ops

area-CodeGen-coreclrhelp wantedin-pr

dotnet/runtime #95,747 opened Dec 7, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

3 comments0 reactions0 assignees

Open

Console.IsInputRedirected returns true on git bash when there is no redirected input

area-System.Consolehelp wanted

dotnet/runtime #95,079 opened Nov 21, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

10 comments0 reactions0 assignees

Open

[API Proposal]: Add `BindingFlags.IgnoreAccessModifiers`

api-approvedarea-System.Reflectioncode-analyzercode-fixerhelp wanted

dotnet/runtime #94,536 opened Nov 8, 2023 · C# · 17,886 stars

Why recommendedNo assignee yet · Has a beginner-friendly label

No assignee yetHas a beginner-friendly labelContributing guide available

27 comments30 reactions0 assignees

dotnet/runtime

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