Rename files from a folder C#

C# > Files > File Class > Move

Moves a specified file to a new location.

• option to specify a new file name

Example 

Rename files from a folder 

DirectoryInfo d = new DirectoryInfo(@"D:\folder");

FileInfo[] infos = d.GetFiles("*.*");

int i = 1;

foreach (FileInfo f in infos)

{

  File.Move(f.FullName, Path.Combine(f.DirectoryName, + i.ToString() + ".jpg"));

  i++;

}

Mock Assembly Unit Test C#

C# > Unit tests > Mock Assembly 

If you try to mock

var mock = new Mock<Assembly>();

You will get this error:

The type System.Reflection.Assembly implements ISerializable, but failed to provide a deserialization constructor

Solution

Mock _Assembly interface instead of Assembly class.

var mock = new Mock<_Assembly>();

mock.Setup(w => w.GetTypes()).Throws(new Exception());

yield C# Example with KeyValuePair

C# > Keywords > yield

Yield  returns each element one at a time.

When to use:

• when calculate the next item in the list 
• for infinite sets

Example

IEnumerable<KeyValuePair<string, string>> dataList = GetData();

dataList.ToList().ForEach(s => MessageBox.Show(s.Key + s.Value));

private IEnumerable<KeyValuePair<string, string>> GetData()

{

yield return new KeyValuePair<string, string>("1", "A");

yield return new KeyValuePair<string, string>("2", "B");

yield return new KeyValuePair<string, string>("3", "C");

}

Concatenate list of strings c#

C#>  Enumerable > Aggregate

Aggregate performs a calculation over a sequence of values.

Example

List<string> items = new List<string>() { "1", "2", "3", "4" };

var x = items.Aggregate((a, b) => a + "," + b); // "1,2,3,4"

XmlNamespaceManager class c#

C# > XML > XmlNamespaceManager

XML namespaces associate element and attribute names in an XML document with custom and predefined URIs.

Methods

• AddNamespace

Convert ushort to byte array and to ASCII code C# using BitConverter

C#  > System > BitConverter

Converts 

• base data types to an array of bytes,
• array of bytes to base data types.

Example

Convert ushort to ASCII code.
(ascii code 2 bytes array)

ushort number = 5678;

byte[] byteArray = BitConverter.GetBytes(number);

foreach (var result in byteArray)

{

string val = System.Convert.ToChar(result).ToString();

}

How To Convert A Number To an ASCII Character C#

C#  > System > Convert > ToChar

Converts the value of the specified 8-bit unsigned integer to its equivalent Unicode character.

Example

Convert a number to an ASCII Character

 var asciiCode = System.Convert.ToChar(65).ToString(); // 'A'