DapperLib / DapperLib/DapperAOT

TypeHanderCache issue

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Dominant language
C#
Stars
472
Forks
43
Avg merge
1d 4h
Merged PRs (30d)
18

Description

Hi,

i've following issue with dapper after Publishing my software as AOT:

'Dapper.SqlMapper+TypeHandlerCache' 1[System.Guid]' is missing native code or metadata. This can happen for code that is not compatible with trimming or AOT. Inspect and fix trimming and AOT related warnings that were generated when the app was published. For more information see
https://aka.ms/nativeaot-compatibility

Already added an Handler for GUID:


public sealed class GuidAsStringHandler : SqlMapper.TypeHandler<Guid>
{
    public override void SetValue(IDbDataParameter parameter, Guid value)
        => parameter.Value = value.ToString();

    public override Guid Parse(object value) => value switch
    {
        string s => Guid.Parse(s),
        byte[] b => new Guid(b),
        _ => Guid.Parse(Convert.ToString(value)!)
    };
}

I didn't see any warning about this while building

Can you give me an advice on this?

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the reported C# application after publishing it as AOT, then inspect the generated trimming/AOT warnings and the TypeHandlerCache error. Done means the Guid handler scenario no longer fails under AOT and the relevant compatibility warnings are addressed.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
backend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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