Function.cs

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namespace System.Data;
 
internal sealed class Function
{
    internal readonly string _name;
 
    internal readonly FunctionId _id;
 
    internal readonly Type _result;
 
    internal readonly bool _isValidateArguments;
 
    internal readonly bool _isVariantArgumentList;
 
    internal readonly int _argumentCount;
 
    internal readonly Type[] _parameters = new Type[3];
 
    internal static string[] s_functionName = new string[39]
    {
        "Unknown", "Ascii", "Char", "CharIndex", "Difference", "Len", "Lower", "LTrim", "Patindex", "Replicate",
        "Reverse", "Right", "RTrim", "Soundex", "Space", "Str", "Stuff", "Substring", "Upper", "IsNull",
        "Iif", "Convert", "cInt", "cBool", "cDate", "cDbl", "cStr", "Abs", "Acos", "In",
        "Trim", "Sum", "Avg", "Min", "Max", "Count", "StDev", "Var", "DateTimeOffset"
    };
 
    internal Function(string name, FunctionId id, Type result, bool IsValidateArguments, bool IsVariantArgumentList, int argumentCount, Type a1, Type a2, Type a3)
    {
        _name = name;
        _id = id;
        _result = result;
        _isValidateArguments = IsValidateArguments;
        _isVariantArgumentList = IsVariantArgumentList;
        _argumentCount = argumentCount;
        if (a1 != null)
        {
            _parameters[0] = a1;
        }
        if (a2 != null)
        {
            _parameters[1] = a2;
        }
        if (a3 != null)
        {
            _parameters[2] = a3;
        }
    }
}