Yahoo Web Search

Search results

1. Top results related to what are the function of dictionary in c compiler design in c# 7

   • in c we are using abs to find the absolute value,in c# what we are using for that purpose?

     Top Answer

     Answered Jul 02, 2017 · 4 votes

     Are you looking for Math.Abs?

     ...else if (Math.Abs(z-x) < Math.Abs(z-y))) { ... }-

     You can get rid of annoying Math. class prefix with a help of using static:

     using static System.Math;-... -else if (Abs(z-x) < Abs(z-y))) { ... }

     Check all answers on Stack Overflow

     1/5

   • What are the uses of "using" in C#?

     Top Answer

     Answered Apr 24, 2020 · 539 votes

     The reason for the using statement is to ensure that the object is disposed as soon as it goes out of scope, and it doesn't require explicit code to ensure that this happens.

     As in Understanding the 'using' statement in C# (codeproject) and Using objects that implement IDisposable (microsoft), the C# compiler converts

     using (MyResource myRes = new MyResource()){ myRes.DoSomething();}

     to

     { // Limits scope of myRes MyResource myRes= new MyResource(); try { myRes.DoSomething(); } finally { // Check for a null resource. if (myRes != null) // Call the object's Dispose method. ((IDisposable)myRes).Dispose(); }}

     C# 8 introduces a new syntax, named "using declarations":

     A using declaration is a variable declaration preceded by the using keyword. It tells the compiler that the variable being declared should be disposed at the end of the enclosing scope.

     So the equivalent code of above would be:

     using var myRes = new MyResource();myRes.DoSomething();

     And when control leaves the containing scope (usually a method, but it can also be a code block), myRes will be disposed.

     Other Answers

     Answered Jul 21, 2017 · 139 votes

     Since a lot of people still do:

     using (System.IO.StreamReader r = new System.IO.StreamReader(""))using (System.IO.StreamReader r2 = new System.IO.StreamReader("")) { //code}

     I guess a lot of people still don't know that you can do:

     using (System.IO.StreamReader r = new System.IO.StreamReader(""), r2 = new System.IO.StreamReader("")) { //code}

     Other Answers

     Answered Mar 05, 2018 · 101 votes

     Things like this:

     using (var conn = new SqlConnection("connection string")){ conn.Open(); // Execute SQL statement here on the connection you created}

     This SqlConnection will be closed without needing to explicitly call the .Close() function, and this will happen even if an exception is thrown, without the need for a try/catch/finally.

     Check all answers on Stack Overflow

     2/5

   • In C#, what's the best way to search a list of a class by one of the class's members?

     Top Answer

     Answered Nov 12, 2009 · 7 votes

     int index = list.FindIndex(m => m.Member == someMember);-

     Check all answers on Stack Overflow

     3/5

   • In c#, what are the rules for defining a pure method?

     Top Answer

     Answered Jun 20, 2020 · 11 votes

     According to Wikipedia - Pure function:

     In computer programming, a function may be considered a pure function if both below statements about the function hold:

     • The function always evaluates the same result value given the same argument value(s). The function result value cannot depend on any hidden information or state that may change while program execution proceeds or between different executions of the program, nor can it depend on any external input from I/O devices (usually—see below).
     • Evaluation of the result does not cause any semantically observable side effect or output, such as mutation of mutable objects or output to I/O devices (usually—see below).

     The Microsoft documentation for the PureAttribute states this:

     Indicates that a type or method is pure, that is, it does not make any visible state changes.

     Microsofts description of what a pure method is is somewhat shorter and is missing one key piece, the fact that a pure method should always evaluate to the same result given the same input arguments.

     So is your method pure?

     • If you feed it the same rectangle and the same other argument values, it will always generate the same output, it does not use any other variables or information than what was provided to it through parameters.
     • Assuming that your usage of Rectangle is System.Drawing.Rectangle, which is a struct, then even though the method appears to be changing the rectangle it is only changing its own private copy of it, and thus you will not see any observable side effects of this method.
     • It does not use or change state (state is considered everything external to the argument values).

     So yes, this method is pure.

     Check all answers on Stack Overflow

     4/5

   • What are the differences between C, C# and C++ in terms of real-world applications?

     Top Answer

     Answered Jan 06, 2019 · 68 votes

     Both C and C++ give you a lower level of abstraction that, with increased complexity, provides a breadth of access to underlying machine functionality that are not necessarily exposed with other languages. Compared to C, C++ adds the convenience of a fully object oriented language(reduced development time) which can, potentially, add an additional performance cost. In terms of real world applications, I see these languages applied in the following domains:

     C

     • Kernel level software.
     • Hardware device drivers
     • Applications where access to old, stable code is required.

     C,C++

     • Application or Server development where memory management needs to be fine tuned (and can't be left to generic garbage collection solutions).
     • Development environments that require access to libraries that do not interface well with more modern managed languages.
     • Although managed C++ can be used to access the .NET framework, it is not a seamless transition.

     C# provides a managed memory model that adds a higher level of abstraction again. This level of abstraction adds convenience and improves development times, but complicates access to lower level APIs and makes specialized performance requirements problematic.

     It is certainly possible to implement extremely high performance software in a managed memory environment, but awareness of the implications is essential.

     The syntax of C# is certainly less demanding (and error prone) than C/C++ and has, for the initiated programmer, a shallower learning curve.

     C#

     • Rapid client application development.
     • High performance Server development (StackOverflow for example) that benefits from the .NET framework.
     • Applications that require the benefits of the .NET framework in the language it was designed for.

     Johannes Rössel makes the valid point that the use C# Pointers, Unsafe and Unchecked keywords break through the layer of abstraction upon which C# is built. I would emphasize that type of programming is the exception to most C# development scenarios and not a fundamental part of the language (as is the case with C/C++).

     Other Answers

     Answered Jul 21, 2017 · 139 votes

     Since a lot of people still do:

     using (System.IO.StreamReader r = new System.IO.StreamReader(""))using (System.IO.StreamReader r2 = new System.IO.StreamReader("")) { //code}-

     I guess a lot of people still don't know that you can do:

     using (System.IO.StreamReader r = new System.IO.StreamReader(""), r2 = new System.IO.StreamReader("")) { //code}-

     Other Answers

     Answered Mar 05, 2018 · 101 votes

     Things like this:

     using (var conn = new SqlConnection("connection string")){ conn.Open();- // Execute SQL statement here on the connection you created}

     This SqlConnection will be closed without needing to explicitly call the .Close() function, and this will happen even if an exception is thrown, without the need for a try/catch/finally.

     Check all answers on Stack Overflow

     5/5

   Show moreShow less

2. www.geeksforgeeks.org › implementation-on-map-orImplementation on Map or Dictionary Data Structure in C

   www.geeksforgeeks.org › implementation-on-map-or

   • Cached

   Mar 27, 2023 · Functions used to implement Map in C. The getIndex function searches for a key in the keys array and returns its index if found, or -1 if not found. The insert function inserts a key-value pair into the map. If the key already exists, it updates the value.

3. www.geeksforgeeks.org › c-sharp-dictionary-withC# Dictionary with examples - GeeksforGeeks

   www.geeksforgeeks.org › c-sharp-dictionary-with

   • Cached

   6 days ago · In C#, Dictionary is a generic collection which is generally used to store key/value pairs. The working of Dictionary is quite similar to the non-generic hashtable. The advantage of Dictionary is, it is generic type. Dictionary is defined under System.Collections.Generic namespace.

4. stackoverflow.com › questions › 1838476optimization - Different ways of adding to a dictionary in C# ...

   stackoverflow.com › questions › 1838476

   Dictionary.Add(key, value) and Dictionary[key] = value have different purposes: Use the Add method to add new key/value pair, existing keys will not be replaced (an ArgumentException is thrown).

5. stackoverflow.com › questions › 37969936When to use Dictionary in C#? - Stack Overflow

   stackoverflow.com › questions › 37969936

   Jun 22, 2016 · You use Dictionary<TKey,TValue> when you need to store values with some unique keys associated to them, and accessing them by that key is convenient for you. A lot of people will answer by talking about complexity, speed of access and insertions and things like that.

6. amarozka.dev › dictionary-data-structure-in-csharpEfficient Data Management with Dictionary in C# - .Net Code ...

   amarozka.dev › dictionary-data-structure-in-csharp

   • Cached

   Aug 16, 2023 · In C#, the `Dictionary<TKey, TValue>` class from the `System.Collections.Generic` namespace provides a powerful implementation of this data structure. This post we delve into the technical aspects of the C# Dictionary class, highlighting its features, usage scenarios, and performance considerations.

7. stackoverflow.com › questions › 4233536C# Store functions in a Dictionary - Stack Overflow

   stackoverflow.com › questions › 4233536

   Like this: Dictionary<int, Func<string, bool>>. This allows you to store functions that take a string parameter and return boolean. dico[5] = foo => foo == "Bar"; Or if the function is not anonymous: dico[5] = Foo; where Foo is defined like this: public bool Foo(string bar) {.

8. www.gyata.ai › c-sharp › c-sharp-dictionaryMastering C# Dictionary: A Comprehensive Guide - Gyata

   www.gyata.ai › c-sharp › c-sharp-dictionary

   • Cached

   Dec 8, 2023 · Introduction. Understanding C# Dictionary. Adding Elements to a Dictionary. Accessing Elements in a Dictionary. Modifying Elements in a Dictionary. Dealing with Errors and Exceptions. Conclusion. Introduction. C# is a powerful programming language, filled with numerous features. One such feature is the C# Dictionary.