CsvProvider encoding is not recognized

[klinki]

Hello,

I'm trying to use CsvProvider with specified encoding, so the definition looks like this:

    type TradeRows = CsvProvider<csvDefinitionFile, Separators = ";", SkipRows = 3, HasHeaders = true, Encoding = "1250", Culture = "cs-CZ", IgnoreErrors = true>

but I'm getting following error during build:

No data is available for encoding 1250. For information on defining a custom encoding, see the documentation for the Encoding.RegisterProvider method.

Funny thing is this project works completely fine in Visual Studio, but I cannot build it with dotnet build or Rider.

I understand I have to register encodings with something like this:

Encoding.RegisterProvider CodePagesEncodingProvider.Instance

but how to do it so it is recognized by CsvProvider?

[dsyme]

I'm not actually sure. Perhaps we should just register all available encoding providers by default in the design-time component

[dsyme]

A partial fix to this is here: #1503

An additional package needs to be referenced, or we must move to later .NET for the design time component

[github-actions]

🤖 This is an automated response from Repo Assist.

Good news! I've created a draft PR that addresses this issue for the .net8.0 design-time target.

Root cause: On .NET 6+, code-page encodings (e.g. windows-1250, cp1250) are not registered by default. Encoding.GetEncoding(1250) throws "No data is available for encoding 1250" unless CodePagesEncodingProvider.Instance is registered first.

The fix adds a #if NET6_0_OR_GREATER guard in IO.fs to register the provider before resolving the encoding when reading a local file:

#if NET6_0_OR_GREATER
Encoding.RegisterProvider(CodePagesEncodingProvider.Instance)
#endif
HttpEncodings.getEncoding encodingStr

Limitation: The netstandard2.0 design-time target (used with older VS tooling) is not fixed — it would need the System.Text.Encoding.CodePages NuGet package. If you're still hitting issues after the fix, ensure your project targets .NET 8 or call Encoding.RegisterProvider(CodePagesEncodingProvider.Instance) early in your application startup.

Please see the draft PR [Repo Assist] Fix #1453: Register CodePagesEncodingProvider on .NET 6+ for code-page encodings for details.

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