public MethodBuilder DefineMethod(
string methodName,
ParameterExpression[] paramExprs,
Expression bodyExpr,
MethodAttributes methodAttributes = MethodAttributes.Public | MethodAttributes.Virtual,
CallingConventions callingConventions = CallingConventions.Standard | CallingConventions.HasThis)
{
if (paramExprs == null)
{
paramExprs = Array.Empty <ParameterExpression>();
}
Type[] paramTypes = new Type[paramExprs.Length];
string[] paramNames = new string[paramExprs.Length];
for (int i = 0; i < paramExprs.Length; i++)
{
paramTypes[i] = paramExprs[i].Type;
paramNames[i] = paramExprs[i].Name;
}
if (callingConventions.HasFlag(CallingConventions.HasThis))
{
ParameterExpression[] newParams = new ParameterExpression[paramExprs.Length + 1];
newParams[0] = This;
Array.Copy(paramExprs, 0, newParams, 1, paramExprs.Length);
paramExprs = newParams;
}
MethodBuilder newMethod = TypeBuilder.DefineMethod(
methodName,
methodAttributes,
callingConventions,
bodyExpr.Type,
paramTypes);
for (int i = 0; i < paramTypes.Length; i++)
{
newMethod.DefineParameter(i, ParameterAttributes.None, paramNames[i]);
}
bool success = ExpressionCompiler.CompileForTypeBuilder(paramExprs, bodyExpr, bodyExpr.Type, newMethod.GetILGenerator(), true);
if (!success)
{
throw new InvalidOperationException($"Can't compile method");
}
Methods.Add(new RuntimeTypeMethod(methodName, newMethod, paramTypes, bodyExpr.Type));
return(newMethod);
}