public ExcelParamsArgumentAttribute(ExcelArgumentAttribute original)
{
// Just copy all the fields
AllowReference = original.AllowReference;
Description = original.Description;
Name = original.Name;
}
// NOTE: 16 parameter max for Expression.GetDelegateType
public RegistrationEntry(MethodInfo methodInfo)
{
MethodInfo = methodInfo;
var paramExprs = methodInfo.GetParameters()
.Select(pi => Expression.Parameter(pi.ParameterType, pi.Name))
.ToArray();
FunctionLambda = Expression.Lambda(Expression.Call(methodInfo, paramExprs), methodInfo.Name, paramExprs);
// Need to make sure we have explicit
FunctionAttribute = methodInfo.GetCustomAttribute<ExcelFunctionAttribute>();
if (FunctionAttribute == null)
FunctionAttribute = new ExcelFunctionAttribute { Name = methodInfo.Name };
else if (string.IsNullOrEmpty(FunctionAttribute.Name))
FunctionAttribute.Name = methodInfo.Name;
ArgumentAttributes = new List<ExcelArgumentAttribute>();
foreach (var pi in methodInfo.GetParameters())
{
var argAtt = pi.GetCustomAttribute<ExcelArgumentAttribute>();
if (argAtt == null)
argAtt = new ExcelArgumentAttribute { Name = pi.Name };
else if (string.IsNullOrEmpty(argAtt.Name))
argAtt.Name = pi.Name;
ArgumentAttributes.Add(argAtt);
}
// Special check for final Params argument - transform to an ExcelParamsArgumentAttribute
// NOTE: This won't work with a custom derived attribute...
var lastParam = methodInfo.GetParameters().LastOrDefault();
if (lastParam != null && lastParam.GetCustomAttribute<ParamArrayAttribute>() != null)
{
var excelParamsAtt = new ExcelParamsArgumentAttribute(ArgumentAttributes.Last());
ArgumentAttributes[ArgumentAttributes.Count - 1] = excelParamsAtt;
}
}
/// <summary>
/// Also craetes attributes from Optional / Default Value
/// </summary>
/// <param name="parameterInfo"></param>
public ExcelParameterRegistration(ParameterInfo parameterInfo)
{
CustomAttributes = new List<object>();
var allParameterAttributes = parameterInfo.GetCustomAttributes(true);
foreach (var att in allParameterAttributes)
{
var argAtt = att as ExcelArgumentAttribute;
if (argAtt != null)
{
ArgumentAttribute = argAtt;
if (string.IsNullOrEmpty(ArgumentAttribute.Name))
ArgumentAttribute.Name = parameterInfo.Name;
}
else
{
CustomAttributes.Add(att);
}
}
// Check that the ExcelArgumentAttribute has been set
if (ArgumentAttribute == null)
{
ArgumentAttribute = new ExcelArgumentAttribute { Name = parameterInfo.Name };
}
// Extra processing for Optional / Default values
// TODO: Also consider DefaultValueAttribute (which is wrong, but might be used...)
if (parameterInfo.IsOptional && parameterInfo.DefaultValue != DBNull.Value)
{
Debug.Assert(CustomAttributes.OfType<OptionalAttribute>().Any());
Debug.Assert(!CustomAttributes.OfType<DefaultParameterValueAttribute>().Any());
CustomAttributes.Add(new DefaultParameterValueAttribute(parameterInfo.DefaultValue));
}
}
public ExcelParameterRegistration(ExcelArgumentAttribute argumentAttribute)
{
if (argumentAttribute == null) throw new ArgumentNullException("argumentAttribute");
ArgumentAttribute = argumentAttribute;
CustomAttributes = new List<object>();
}