Browse questions answered by Jon Skeet

How to set different forecolor to single label?

lblOperationType.Text = "Text"; Label l1 = new Label(); int len = lblOperationType.Text.Length - 1; string b = Convert.ToString(lblOperationType.Text.ToCharArray()[0]); string a =...

No, in general (i.e. without custom rendering yourself) a label only has a single foreground colour. Assuming this is Windows Forms, it sounds like you might want a RichTextBox instead - that allows multiple colours, fonts etc within a... more 10/22/2013 6:08:45 AM

Assigning an int to a struct object without using unsafe

I have a struct definition in c# as follows public struct test { byte SetCommonPOP; ...

You could write a custom conversion operator: public struct Test { private readonly byte pop; private readonly byte svp; private readonly byte uhdp; private readonly byte mhdp; // TODO: Properties to return the... more 10/21/2013 4:45:15 PM

Wrapping Native Async functions with Task<T>

I'm attempting to write a c# wrapper around a third-party library written in native code for consumption in our apps, which are almost exclusively written in .NET, and I'm trying...

It sounds like you're looking for TaskCompletionSource<T>. You'd wrap your library by creating a TaskCompletionSource, creating an instance of MyNativeLibrary and registering a callback which set the result of the task completion... more 10/21/2013 1:46:50 PM

Can an interface have static variables in C#

It might be a silly question, I appreciate if someone can help me understand it. Can an interface in C# can have static variables? If the interface itself need to be static to...

No, an interface in C# can't declare fields at all. You can't declare a static interface at all in C#, nor can you declare static members within an interface. As per section 11.2 of the C# specification: An interface declaration may... more 10/21/2013 1:41:09 PM

Answer is always 0

import java.io.*; class empl { int p, n, r, i; void accept() { try { BufferedReader br = new BufferedReader(new...

Your accept method declares new local variables for p, n and r - it doesn't assign values to the instance variables, which will still have a value of 0. Rather than declaring local variables, you should just assign values to the instance... more 10/21/2013 1:34:01 PM

Is it possible to check via reflection that type is in using block (Dispose is called)

I need to find automatically all code that not disposed properly. Is it possible to check via reflection that my type N is used inside using statement (Dispose is called)?

No. The closest you could come is to add a finalizer - possibly conditionally so that it's only included for debug builds - which checks whether or not you've been disposed and logs the problem otherwise. (You'd probably want to keep the... more 10/21/2013 1:01:46 PM

Iterate over IDictionary with implicit DictionaryEntry

Consider this code: var variables = System.Environment.GetEnvironmentVariables(); foreach (DictionaryEntry vari in variables) { Console.WriteLine(vari.Key); ...

Why cannot I type foreach(var vari in variables)? Well you can - but then vari is implicitly of type object. You happen to know that each entry within the iterator is a DictionaryEntry, but the compiler doesn't. As far as it's aware,... more 10/21/2013 8:44:40 AM

Why [Enum].Parse has an ignoreCase parameter?

Since an Enumeration in VB.Net cannot contains duplicated values like this: Enum Test A a End Enum Then why the [Enum].Parse method has a StringCase...

An enum can contain values which differ only in case - you just can't declare them in VB. This is perfectly valid C#: public enum Foo { A, a; } Additionally, even if the enum couldn't contain values differing only in case, that... more 10/21/2013 8:39:49 AM

Program exits while calling await function

Hello, I want to consume REST api. I use code like this: namespace test2 { class Program { static void Main(string[] args) { TestRest t = new TestRest(); ...

There are two problems here: You've got a void async method, which is almost always a bad idea unless it's meant to be an event handler. You should generally make an async method return Task where you'd normally write a void synchronous... more 10/21/2013 8:36:59 AM

A better way to provide common data for enum s

Suppose, I want an int[] array to be shared by all instances of enum. Here is an example public enum SampleEnum { Enum1(1), Enum2(2), Enum3(3), Enum4(4); private int[]...

It there a reason for not allowing a reference to a static class within enum initializer? It's a static field that you're not allowed access to, and there's a very good reason: the field will still have its initial value, because the... more 10/21/2013 6:06:22 AM