是否可以使用静态类来对扩展方法进行分组？

Question

Adding extension methods is simple via:

public static class MyStringExtensions
{
    public static string MyMethodOne(this string aSource)
    {
        return aSource += "My Method One";
    }

    public static string MyMethodTwo(this string aSource)
    {
        return aSource += "My Method Two";
    }
}

and callable as:

"some string".MyMethodOne();
"some string".MyMethodTwo();

However I have a large number of method and want to "group them" using a static class container:

public static class MyStringExtensionsGroup
{
    public static string MethodOne(string aSource)
    {
        return aSource += "My Method One";
    }

    public static string MethodTwo(string aSource)
    {
        return aSource += "My Method Two";
    }
}

So assuming I somehow expose My : MyStringExtensionsGroup as a string extension I could end up calling things with the following convention (note period after My ):

"some string".My.MethodOne();
"some string".My.MethodTwo();

and say I had another grouping called '''MyOtherGroup''' I could then do:

"some string".MyOtherGroup.MethodOne();
"some string".MyOtherGroup.MethodTwo();

Is any "grouping" of extension methods possible with what C# currently provides?

Answer 1

Extensions methods can't be nested , however with a lot of mindless fiddling you could create your own fluent syntax .

Extensions

public static class MyStringExtensionsGroup
{
   public static string MethodOne(this Group1 group) => group.Source + "My Method One";
   public static string MethodTwo(this Group2 group) => group.Source + "My Method Two";
   public static Group1 Group1(this string source) => new Group1(source);
   public static Group2 Group2(this string source) => new Group2(source);
}

Groups

public class Group1
{
   public string Source { get; }
   public Group1(string source) => Source = source;
}

public class Group2
{
   public string Source { get; }
   public Group2(string source) => Source = source;
}

Or you could just stuff your methods in the class, which is neater

public class Group1
{
   public string Source { get; }
   public Group1(string source) => Source = source;
   public string MethodOne() => Source + "My Method One";
   public string MethodTwo() => Source + "My Method Two";
}

public class Group2
{
   public string Source { get; }
   public Group2(string source) => Source = source;
   public string MethodOne() => Source + "My Method One";
   public string MethodTwo() => Source + "My Method Two";
}

Either way the usage is the same

Usage

var someString = "asd";
Console.WriteLine(someString.Group1().MethodOne());
Console.WriteLine(someString.Group2().MethodTwo());

Note : There are other ways and structures that can do this, however this will get you started if you want to go down this rabbit hole

In summary, I wouldn't do this at all :)