Some Common Conversion Functions

In this article, we will explore some commonly used conversion functions in our projects. This is the first part of our two part series. I will cover up some other commonly used conversions in the second part. If you feel, there are any other conversion functions to be covered, use the Contact page to drop me a mail.

Convert Degree To Radian

1 degree = 0.0174532925 radian. To convert a value in degrees to radians, multiply it by (pi/180). .NET contains the static field Math.PI which represents π (pi). To convert degree to radian in .NET, use the code below:

C#

// Convert Degree to Radian

public static double DegreeToRadian(double degree)

{

return (Math.PI / 180) * degree;

}

VB.NET

' Convert Degree to Radian

Public Shared Function DegreeToRadian(ByVal degree As Double) As Double

Return (Math.PI / 180) * degree

End Function

Convert Radian To Degree

1 radian = 57.2957795 degree. To convert a value in radians to degree, multiply it by (180/pi). To convert radian to degree in .NET, use the code below:

C#

// Convert Radian To Degree

public static double RadianToDegree(double radian)

{

return (180 / Math.PI) * radian;

}

VB.NET

' Convert Radian To Degree

Public Shared Function RadianToDegree(ByVal radian As Double) As Double

Return (180 / Math.PI) * radian

End Function

Round Float to Integer

The Math.Round() returns the whole number nearest the specified value.

C#

// Round Float to Integer

public static int RoundFloatToInt(float f)

{

return ((int)Math.Round(f));

// If you want to round to a fixed decimal place, say 3

// return ((int)Math.Round(f,3));

}

VB.NET

' Round Float to Integer

Public Shared Function RoundFloatToInt(ByVal f As Single) As Integer

Return (CInt(Fix(Math.Round(f))))

' If you want to round to a fixed decimal place, say 3

' Return (CInt(Fix(Math.Round(f,3));

End Function

If you want to round a number to a fixed decimal place, specify the number in the Round method as shown below:

public static double Round(double, int);

For eg: If you want to round to a fixed decimal place, say 3, use :

return ((int)Math.Round(f,3));

Convert Celsius To Fahrenheit

1 degree Celsius = 33.8 degrees Fahrenheit.

Formula is f = (9 /5 * c) + 32. Here’s how it is implemented in .NET

C#

// Celcius to Fahrenheit

public static double CelciusToFahrenheit(double cel)

{

return (((0.9 / 0.5) * cel) + 32);

}

VB.NET

' Celsius to Fahrenheit

Public Shared Function CelsiusToFahrenheit(ByVal cel As Double) As Double

Return (((0.9 / 0.5) * cel) + 32)

End Function

Convert Fahrenheit to Celsius

32 degree Fahrenheit = 0 degree Celsius

Formula is c = 5/9 * (f-32). Here’s how it is implemented in .NET

C#

// Fahrenheit to Celsius

public static double FahrenheitToCelsius(double farh)

{

return ((0.5 / 0.9) * (farh - 32));

}

VB.NET

' Fahrenheit to Celsius

Public Shared Function FahrenheitToCelsius(ByVal farh As Double) As Double

Return ((0.5 / 0.9) * (farh - 32))

End Function

Convert String To Integer

In order to convert string to integer, use the Int32.Parse(). The Parse method converts the string representation of a number to its 32-bit signed integer equivalent. If the string contains non-numeric values, it throws an error.

C#

// Convert String to Int

public static int StringToInt(string str)

{

return Int32.Parse(str);

}

VB.NET

' Convert String to Int

Public Shared Function StringToInt(ByVal str As String) As Integer

Return Int32.Parse(str)

End Function

Convert String to Base64 string

You will have to use the methods in System.Text.Encoding to convert string to Base64. The conversion involves two processes:

a. Convert string to a byte array

b. Use the Convert.ToBase64String() method to convert the byte array to a Base64 string

C#

// Convert String to Base64

public static string StringToBase64(string str)

{

byte[] b = System.Text.Encoding.UTF8.GetBytes(str);

string b64 = Convert.ToBase64String(b);

return b64;

}

VB.NET

' Convert String to Base64

Public Shared Function StringToBase64(ByVal str As String) As String

Dim b As Byte() = System.Text.Encoding.UTF8.GetBytes(str)

Dim b64 As String = Convert.ToBase64String(b)

Return b64

End Function

Convert Base64 string back to string

In the previous example, we converted a string “I Love dotnet” to Base64 string “SSBsb3ZlIGRvdG5ldA==”. In order to convert a Base64 string back to the original string, use FromBase64String(). The conversion involves two processes:

a. The FromBase64String() converts the string to a byte array

b. Use the relevant Encoding method to convert the byte array to a string, in our case UTF8.GetString();

C#

// Convert Base64string to string

public static string Base64ToString(string b64)

{

byte[] b = Convert.FromBase64String(b64);

return(System.Text.Encoding.UTF8.GetString(b));

}

VB.NET

' Convert Base64string to string

Public Shared Function Base64ToString(ByVal b64 As String) As String

Dim b As Byte() = Convert.FromBase64String(b64)

Return(System.Text.Encoding.UTF8.GetString(b))

End Function