public Type GetDelegateType(Type returnType, IEnumerable <Type> parameterTypes)
{
ArgumentUtility.CheckNotNull("returnType", returnType);
ArgumentUtility.CheckNotNull("parameterTypes", parameterTypes);
var types = parameterTypes.Concat(new[] { returnType }).ToArray();
return(DelegateHelpers.MakeDelegateType(types));
}
public static AsyncLambdaCSharpExpression AsyncLambda(Expression body, IEnumerable <ParameterExpression> parameters)
{
ContractUtils.RequiresNotNull(body, nameof(body));
var parameterList = parameters.ToReadOnly();
var count = parameterList.Count;
var types = new Type[count + 1];
if (count > 0)
{
var set = new Set <ParameterExpression>(count);
for (var i = 0; i < count; i++)
{
var parameter = parameterList[i];
ValidateAsyncParameter(parameter);
types[i] = parameter.Type;
if (set.Contains(parameter))
{
throw LinqError.DuplicateVariable(parameter);
}
set.Add(parameter);
}
}
if (body.Type == typeof(void))
{
types[count] = typeof(Task); // REVIEW: OK to default to Task?
}
else
{
types[count] = typeof(Task <>).MakeGenericType(body.Type);
}
return(CreateAsyncLambda(DelegateHelpers.MakeDelegateType(types), body, parameterList));
}
