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Archives by Tag 'C# Generic'

Separator Delimited ToString for Array, List, Dictionary, Generic IEnumerable

Often programmers want to convert an array into one string with for example comma delimited.
Traditionally, in C#, it can be achieved by

int[] array = {1,2,3};
string delimited = string.Join(”,”, array);
Console.WriteLine(delimited ) // output: "1,2,3"
 

However, string.Join does not apply to any generic IEnumerable object. It would be so much easier if this method behavior could be [...]

C# Extension method, GetValueOrNull for value type object

Return null if the value type object has default value.

public static T? GetValueOrNull<t>( this T value ) where T : struct
{
   if( value.Equals( default( T ) ) )
      return new Nullable<t>();
   else
      return value;
}
// Usage
int i = default(int); //0
int? i = i.GetValueOrNull();
Console.Writeline( i.HasValue );

// output: false