EPPlus/FormulaParsing/Excel/Functions/Text/CharFunction.cs

using System.Collections.Generic;
using OfficeOpenXml.FormulaParsing.ExpressionGraph;

namespace OfficeOpenXml.FormulaParsing.Excel.Functions.Text;

public class CharFunction : ExcelFunction {
  public override CompileResult Execute(
      IEnumerable<FunctionArgument> arguments,
      ParsingContext context) {
    ValidateArguments(arguments, 1);
    var number = ArgToInt(arguments, 0);
    ThrowExcelErrorValueExceptionIf(() => number < 1 || number > 255, eErrorType.Value);
    return CreateResult(((char)number).ToString(), DataType.String);
  }
}