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What is the nature of staticmembers of the class?
jaguarjj
- Mar 22nd, 2011
Static members of the class aren't instantiated upon creating any object of this class because static members are defined for all objects within the same class (i.e. when you create a class called ban...
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Abstract usage in C#
Can any one give real time example for abstract class and virtual function plz in c#(.NET)
cse.jai
- Jan 20th, 2012
An abstract class is a class that cannot be instantiated. The purpose of an abstract class is to provide a common definition of a base class that multiple derived classes can share. For example, a cla...
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Does C# support C type macros?
No. C# does not have macros. Keep in mind that what some of the predefined C macros (for example, __LINE__ and __FILE__) give you can also be found in .NET classes like System.Diagnostics (for example, StackTrace and StackFrame), but they'll only work on debug builds.
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How do you directly call a native function exported from a DLL?
Here's a quick example of the DllImport attribute in action: using System.Runtime.InteropServices;class C{[DllImport("user32.dll")]public static extern int MessageBoxA(int h, string m, string c, int type);public static int Main() {return MessageBoxA(0, "Hello World!", "Caption", 0);}}This example shows the minimum requirements for declaring a C# method that is implemented in a native DLL. The method...
sahu
- Jan 6th, 2006
ans:by using1st:using System.Runtime.InteropServicessecond step[DllImport("user32.dll")]use top of the class
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How do I declare inout arguments in C#?
The equivalent of inout in C# is ref. , as shown in the following example: public void MyMethod (ref String str1, out String str2) {...}When calling the method, it would be called like this: String s1;String s2;s1 = "Hello";MyMethod(ref s1, out s2);Console.WriteLine(s1);Console.WriteLine(s2);Notice that you need to specify ref when declaring the function and calling it.
sahu
- Jan 10th, 2006
Ans:Answer: The equivalent of inout in C# is ref. , as shown in the following example: public void MyMethod (ref String str1, out String str2) {...}When calling the method, it would be called like thi...
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Why do I get a "CS5001: does not have an entry point defined" error when compiling?
The most common problem is that you used a lowercase 'm' when defining the Main method. The correct way to implement the entry point is as follows: class test {static void Main(string[] args) {}}
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How do I create a multilanguage, multifile assembly?
Unfortunately, this is currently not supported in the IDE. To do this from the command line, you must compile your projects into netmodules (/target:module on the C# compiler), and then use the command line tool al.exe (alink) to link these netmodules together.
sahu
- Jan 8th, 2006
Ans:Unfortunately, this is currently not supported in the IDE. To do this from the command line, you must compile your projects into netmodules (/target:module on the C# compiler), and then use the command line tool al.exe (alink) to link these netmodules together.
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How do I simulate optional parameters to COM calls?
You must use the Missing class and pass Missing.Value (in System.Reflection) for any values that have optional parameters.
sahu
- Jan 10th, 2006
Ans:Yes,it is right.Answer: You must use the Missing class and pass Missing.Value (in System.Reflection) for any values that have optional parameters.
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Is there an equivalent of exit() for quitting a C# .NET application?
Yes, you can use System.Environment.Exit(int exitCode) to exit the application or Application.Exit() if it's a Windows Forms app.
sahu
- Jan 6th, 2006
Ans:YesSystem.Environment.Exit(int exitCode) to exit the application or Application.Exit() if it's a Windows Forms app.
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How do you specify a custom attribute for the entire assembly (rather than for a class)?
Global attributes must appear after any top-level using clauses and before the first type or namespace declarations. An example of this is as follows: using System;[assembly : MyAttributeClass]class X {}Note that in an IDE-created project, by convention, these attributes are placed in AssemblyInfo.cs.
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How do I register my code for use by classic COM clients?
Use the regasm.exe utility to generate a type library (if needed) and the necessary entries in the Windows Registry to make a class available to classic COM clients. Once a class is registered in the Windows Registry with regasm.exe, a COM client can use the class as though it were a COM class.
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Can I define a type that is an alias of another type (like typedef in C++)?
Not exactly. You can create an alias within a single file with the "using" directive: using System;using Integer = System.Int32; // aliasBut you can't create a true alias, one that extends beyond the file in which it is declared. Refer to the C# spec for more info on the 'using' statement's scope.
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How can I get the ASCII code for a character in C#?
Casting the char to an int will give you the ASCII value: char c = 'f';System.Console.WriteLine((int)c);or for a character in a string: System.Console.WriteLine((int)s[3]);The base class libraries also offer ways to do this with the Convert class or Encoding classes if you need a particular encoding.
sahu
- Jan 8th, 2006
Ans:// Create an ASCII encoding. Encoding ascii = Encoding.ASCII;The base class libraries also offer ways to do this with the Convert class or Encoding classes if you need a particular encoding.
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Is it possible to restrict the scope of a field/method of a class to the classes in the same namespace?
There is no way to restrict to a namespace. Namespaces are never units of protection. But if you're using assemblies, you can use the 'internal' access modifier to restrict access to only within the assembly.
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If I return out of a try/finally in C#, does the code in the finally-clause run?
Yes. The code in the finally always runs. If you return out of the try block, or even if you do a "goto" out of the try, the finally block always runs, as shown in the following example: using System;class main {public static void Main() {try {Console.WriteLine("In Try block");return;}finally {Console.WriteLine("In Finally block");}}}Both "In Try block" and "In Finally block" will be displayed. Whether...
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Does C# support try-catch-finally blocks?
Yes. Try-catch-finally blocks are supported by the C# compiler. Here's an example of a try-catch-finally block: using System;public class TryTest{static void Main(){try{Console.WriteLine("In Try block");throw new ArgumentException();}catch(ArgumentException n1){Console.WriteLine("Catch Block");}finally{Console.WriteLine("Finally Block");}}}Output: In Try BlockCatch BlockFinally Block
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Is it possible to have a static indexer in C#?
No. Static indexers are not allowed in C#.
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How can I access the registry from C# code?
By using the Registry and RegistryKey classes in Microsoft.Win32, you can easily access the registry. The following is a sample that reads a key and displays its value: using System;using Microsoft.Win32;class regTest{public static void Main(String[] args){RegistryKey regKey;Object value;regKey = Registry.LocalMachine;regKey = regKey.OpenSubKey("HARDWARE\DESCRIPTION\System\CentralProcessor\0");value...
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