my extensions 101

Marc · August 2018

Can somebody post (or link to) and example of something that was implemented in my extension?

nescafe · August 2018

My Extensions:

void Main()
{
  // Write code to test your extensions here. Press F5 to compile and run.
}

public static class MyExtensions
{
  // Write custom extension methods here. They will be available to all queries.

  public static int Sum(int a, int b)
  {
    return a + b;
  }
}

// You can also define non-static classes, enums, etc.

Query (Move 'using' directory into Query Properties: Yes):

using static MyExtensions;

Sum(1, 2).Dump();

JoeAlbahari · September 2018

Simple example:

public static class MyExtensions
{
  public static bool Contains (this string s, string value, bool ignoreCase) =>
    s.IndexOf (value, ignoreCase ? StringComparison.OrdinalIgnoreCase : StringComparison.Ordinal) > -1;
}

To use:

"FOO".Contains ("oo", true).Dump(); // case-insensitive

Another example:

public static class MyExtensions
{
    public static bool IsNumeric (this Type t)
    {
        if (t == null) return false;

        t = t.CollapseNullable();

        if (t == typeof (decimal)) return true;
        if (!t.IsPrimitive) return false;
        return t != typeof (char) && t != typeof (bool);
    }

    public static Type CollapseNullable (this Type t)
    {
        if (t == null) return null;
        bool nullable = t.IsGenericType && t.GetGenericTypeDefinition () == typeof (Nullable<>);
        if (nullable) t = t.GetGenericArguments () [0];
        return t;
    }
}

…

typeof (int).IsNumeric().Dump();     // true
typeof (float?).IsNumeric().Dump();  // true
typeof (char).IsNumeric().Dump();    // false

nescafe · September 2018

Thanks for showing *actual* extensions methods

Marc · September 2018

Many thanks.

my extensions 101

Comments

Categories