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Csharp Articles
Page 160 of 196
How to determine if the string has all unique characters using C#?
To determine if a string has unique characters or not, firstly check a word in the string with the next word −for (int j = i + 1; j < val.Length; j++) { if (val[i] == val[j]) }If you find a match, that would mean the string do not have unique characters.If you are unable to find a match, then the string has all unique characters.In case of a match, return false i.e. unique characters not found −for (int j = i + 1; j < val.Length; j++) { if (val[i] == val[j]) return false; }
Read MoreWhat are the C++ features missing in C#?
C# is a simple, modern, general-purpose, object-oriented programming language developed by Microsoft within its .NET initiative led by Anders Hejlsberg.C++ is a middle-level programming language developed by Bjarne Stroustrup starting in 1979 at Bell Labs. C++ runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX.The following are some of the features of C++ missing in C# −In C#, Multiple Inheritance is not possible, whereas C++ can easily implement Multiple Inheritance.In C++, you need to manage memory manually and must allocate and deallocate memory for your objects.C++ can create standalone applications, whereas C# ...
Read MoreHow to capture file not found exception in C#?
The file not found exception is raised when you try to find a file that does not exist.Let’s say I have set a file in StreamReader, “new.txt” that does not exist. If you will try to access it using StreamReader(to read it), it will throw FileNotFoundException −using (StreamReader sReader = new StreamReader("new.txt")) { sReader.ReadToEnd(); }To handle it, you need to use try and catch −Try { using (StreamReader sReader = new StreamReader("new.txt")) { sReader.ReadToEnd(); } }catch (FileNotFoundException e) { Console.WriteLine("File Not Found!"); Console.WriteLine(e); }
Read MoreHow to control for loop using break and continue statements in C#?
Break statement terminates the loop. To use it in a for loop, you can get input from user everytime and display the output when user enters a negative number. The output gets displayed then and exited using the break statement −for(i=1; i
Read MoreWhat does the interface IStructuralEquatable do in C#?
The IStructuralEquatable interface defines methods to support the comparison of objects for structural equality, which means that two objects are equal because they have equal values.It includes the following two methods −Sr.NoMethod & Description1Equals(Object, IEqualityComparer)The method determined whether an object is structurally equal to the current instance.2GetHashCode(IEqualityComparer)The methods a hash code for the current instance.Let us see an example in which I have created Tuple objects and worked with IstructuralEquatable interface:Create Tuples −var tupleOne = Tuple.Create(26.3, Double.NaN, 35.6); var tupleOne = Tuple.Create(26.3, Double.NaN, 35.6);Now check the equality by calling IStructuralEquatable.Equals using default comparer.IStructuralEquatable chk = tupleOne; Console.WriteLine(chk.Equals(tupleTwo, EqualityComparer.Default));
Read MoreWhat is composition in C#?
If the parent object is deleted under Composition, then the child object also loses its status. The composition is a special type of Aggregation and gives a part-of relationship.For example, A Car has an engine. If the car is destroyed, the engine is destroyed as well.public class Engine { . . . } public class Car { Engine eng = new Engine(); ....... }
Read MoreHow to pass pointers as parameters to methods in C#?
To pass pointers as parameters to methods, refer the below steps −Firstly, crate a function swap with unsafe modifier.public unsafe void swap(int* p, int *q) { int temp = *p; *p = *q; *q = temp; }Now under static void main, add the value for the first and second variable, set pointers for both of them.Display the values of the variables and then call the swap() method shown above. The method swaps the values and displays the result −public unsafe static void Main() { Program p = new Program(); int var1 = 10; int ...
Read MoreWhat are pointers in C#?
Pointer is a variable whose value is the address of another variable i.e., the direct address of the memory location.The syntax of a pointer is −type *var-name;The following is how you can declare a pointer type −double *z; /* pointer to a double */C# allows using pointer variables in a function of code block when it is marked by the unsafe modifier. The unsafe code or the unmanaged code is a code block that uses a pointer variable.The following is our module showing how to declare and use a pointer variable. We have used unsafe modifier here −static unsafe void ...
Read MoreHow to use C# BinaryWriter class?
If you want to write binary information into the stream, then use the BinaryWriter class in C#. You can find it under the System.IO namespace.The following is the implementation of the BinaryWriter class −static void WriteMe() { using (BinaryWriter w = new BinaryWriter(File.Open("C:\abc.txt", FileMode.Create))) { w.Write(37.8); w.Write("test”); } } static void ReadMe() { using (BinaryReader r = new BinaryReader(File.Open("C:\abc.txt", FileMode.Open))) { Console.WriteLine("Value : " + r.ReadDouble()); Console.WriteLine("Value : " + r.ReadString()); } }Above, theBinaryWriter class opens a file and writes content into it ...
Read MoreHow to use C# BinaryReader class?
Use the BinaryReader class if you want to read binary information from the stream.The BinaryReader class is in System.IO namespace.The following is an example showing using the BinaryReader class to read from a file −static void WriteMe() { using (BinaryWriter w = new BinaryWriter(File.Open("C:\abc.txt", FileMode.Create))) { w.Write(25.9); w.Write("DEMO DATA"); } } static void ReadMe() { using (BinaryReader r = new BinaryReader(File.Open("C:\abc.txt", FileMode.Open))) { Console.WriteLine("Value : " + r.ReadDouble()); Console.WriteLine("Value : " + r.ReadString()); } }The above method is called in the Main() method ...
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