I have two arrays of doubles of the same size, containg X and Y values for some plots. I need to create some kind of protection against Inf/NaN values. I need to find all that pairs of values (X, Y) for which both, X and Y are not Inf nor NaN If I have one array, I can do it using lambdas: var filteredValues = someValues.Where(d=> !(d...
Hi! I have a question about what exact role do higher-order combinators (or function producers) hold in concatenative/tacit programming. Additionally I would like to ask if there is another way to implement concatenative programming language rather than directly manipulating the stack. This might look like a newbie question, so if yo...
Intro In the application I 'm currently working on, there are two kinds of each business object: the "ActiveRecord" type, and the "DataContract" type. So for example, we have: namespace ActiveRecord { class Widget { public int Id { get; set; } } } namespace DataContract { class Widget { public int Id { get;...
Hi, Can any body translate the following c# code to vb. I have tried telarik code converter but I got problem at expression.call and it won't compile at all. private static IOrderedQueryable<T> OrderingHelper<T>(IQueryable<T> source, string propertyName, bool descending, bool anotherLevel) { ParameterExpression param = Expressio...
I am trying to write an html helper extension within the asp.net mvc framework. public static MvcHtmlString PlatformNumericTextBoxFor<TModel>(this HtmlHelper instance, TModel model, Expression<Func<TModel,double>> selector) where TModel : TableServiceEntity { var viewModel = new PlatformNumericTextBox(); var...
static void Main() { string[] a = { "a", "asd", "bdfsd", "we" }; a = a.OrderBy(fun).ToArray(); } private static int fun(string s) { return s.Length; } its is giving compile time error . I know that we can do this with Lambda expression like this. a.OrderBy(s=>s.Length).ToArray(); but i ...
I'm trying to get the next item in a list of strings (postal codes). Normally I'd just foreach till I find it and then get the next in the list but I'm trying to be a bit more intuitive and compact than that (more of an exercise than anything). I can find it easily with a lambda: List<string> postalCodes = new List<string> { "A1B", "A2...
I have a problem which I could solve using something like this sortedElements.ForEach((XElement el) => PrintXElementName(el,i++)); And this means that I have in ForEach a lambda which permits using parameters like int i. I like that way of doing it, but i read somewhere that anonymous methods and delegates with lambda leads to a lot ...
I have created methods for converting a property lambda to a delegate: public static Delegate MakeGetter<T>(Expression<Func<T>> propertyLambda) { var result = Expression.Lambda(propertyLambda.Body).Compile(); return result; } public static Delegate MakeSetter<T>(Expression<Action<T>> propertyLambda) { var result = Expressio...
I have a System.Collections.Generic.Dictionary<string, string> containing control ID and appropriate data column to data bind: var dic = new Dictionary<string, string> { { "Label1", "FooCount" }, { "Label2", "BarCount" } }; I use it that way: protected void FormView1_DataBound(object sender, EventArgs e) { var row = ((Dat...
hello. A little bit of background: I have some strange multiple nested loops which I converted to flat work queue (basically collapse single index loops to single multi-index loop). right now each loop is hand coded. I am trying to generalized approach to work with any bounds using lambda expressions: For example: // RANGE(i,I,N) is ...
Is there any way to capture by value, and make the captured value non-const? I have a library functor that I would like to capture & call a method that is non-const but should be. The following doesn't compile but making foo::operator() const fixes it. struct foo { bool operator () ( const bool & a ) { return a; } }; int _...
Hello, is there any way how to return lambda from another lambda recursively? All I want to do is finite state machine, implemented as lambda, which returns lambda implementing another state (or null). nesting Func<> won't work as I want. C#, .NET 3.5 Example: machine, 3 states, pseudolanguage private Lambda State1() { if (S...
It is relatively easy to create a lambda function that will return the value of a property from an object, even including deep properties... Func<Category, string> getCategoryName = new Func<Category, string>(c => c.Name); and this can be called as follows... string categoryName = getCategoryName(this.category); But, given only the...
Given the following code... class Program { static void Main(string[] args) { Foo foo = new Foo { Bar = new Bar { Description= "Martin" }, Name = "Martin" }; DoLambdaStuff(foo, f => f.Name); DoLambdaStuff(foo, f => f.Bar.Description); } static void DoLambdaStuff<TObject, TValue>(TObject obj, Expr...
I am writing a dirty little extension method for HtmlHelper so that I can say something like HtmlHelper.WysiwygFor(lambda) and display the CKEditor. I have this working currently but it seems a bit more cumbersome than I would prefer. I am hoping that there is a more straight forward way of doing this. Here is what I have so far. pub...
Hi guys, Have anybody tried to create strongly typed API for ASP.NET MVC 2 async actions? Best regards, Alexey Zakharov ...
You can use Lambda Expression Objects to represent a lambda as an expression. How do you create a Lambda Expression Object representing a generic method call, if you only know the type -that you use for the generic method signature- at runtime? For example: I want to create a Lambda Expression Objects to call: public static TSource L...
Hi Everyone. I'm trying to mimic the LINQ Where extension method for my ADO.NET DAL methods. Bascially, my aim is to have a single method that I can call. Such as: Product p = Dal.GetProduct(x => x.ProductId == 32); Product p2 = Dal.GetProduct(x => x.ProductName.Contains("Soap")); I then want to dissect those Predicates and send th...
I have this following python code, it works fine in python but fails with the following error in IronPython 2.6 any ideas as to why? ====================================================================== ERROR: testAutoProp (__main__.testProperty) ---------------------------------------------------------------------- Traceback (most...