ParameterBuilder.cs

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using System.Runtime.CompilerServices;
 
namespace System.Reflection.Emit;
 
public class ParameterBuilder
{
    private readonly string _name;
 
    private readonly int _position;
 
    private readonly ParameterAttributes _attributes;
 
    private MethodBuilder _methodBuilder;
 
    private int _token;
 
    public virtual string? Name => _name;
 
    public virtual int Position => _position;
 
    public virtual int Attributes => (int)_attributes;
 
    public bool IsIn => (_attributes & ParameterAttributes.In) != 0;
 
    public bool IsOut => (_attributes & ParameterAttributes.Out) != 0;
 
    public bool IsOptional => (_attributes & ParameterAttributes.Optional) != 0;
 
    public virtual void SetConstant(object? defaultValue)
    {
        TypeBuilder.SetConstantValue(_methodBuilder.GetModuleBuilder(), _token, (_position == 0) ? _methodBuilder.ReturnType : _methodBuilder.m_parameterTypes[_position - 1], defaultValue);
    }
 
    public void SetCustomAttribute(ConstructorInfo con, byte[] binaryAttribute)
    {
        if (con == null)
        {
            throw new ArgumentNullException("con");
        }
        if (binaryAttribute == null)
        {
            throw new ArgumentNullException("binaryAttribute");
        }
        TypeBuilder.DefineCustomAttribute(_methodBuilder.GetModuleBuilder(), _token, ((ModuleBuilder)_methodBuilder.GetModule()).GetConstructorToken(con), binaryAttribute);
    }
 
    public void SetCustomAttribute(CustomAttributeBuilder customBuilder)
    {
        if (customBuilder == null)
        {
            throw new ArgumentNullException("customBuilder");
        }
        customBuilder.CreateCustomAttribute((ModuleBuilder)_methodBuilder.GetModule(), _token);
    }
 
    internal ParameterBuilder(MethodBuilder methodBuilder, int sequence, ParameterAttributes attributes, string paramName)
    {
        _position = sequence;
        _name = paramName;
        _methodBuilder = methodBuilder;
        _attributes = attributes;
        ModuleBuilder module = _methodBuilder.GetModuleBuilder();
        _token = TypeBuilder.SetParamInfo(new QCallModule(ref module), _methodBuilder.MetadataToken, sequence, attributes, paramName);
    }
}