https://learn.microsoft.com/ja-jp/dotnet/api/system.text.encoderreplacementfallbackbuffer.-ctor?view=netframework-4.8.1&viewFallbackFrom=net-10.0
EncoderReplacementFallbackBuffer(EncoderReplacementFallback) Constructor (System.Text) | Microsoft...
Initializes a new instance of the EncoderReplacementFallbackBuffer class using the value of a EncoderReplacementFallback object.
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