C#

public static RectangleF Parse(this RectangleF rect, string s)
{
//do something with s
}

public static RectangleF Parse(string s)
{
    RectangleF result = new RectangleF();
    //apply parsed values
    return result;
}

RectangleF rect = RectangleF.Parse("0,0,100,50");

public static class MoreTryParse {
	public static bool TryParse(this RectangleF dummy, string s, out RectangleF rect) {
		float x=0;
		float y=0;
		float w=0;
		float h=0;
		if (s.StartsWith("(") && s.EndsWith(")")) s=s.Substring(1, s.Length-2);
		string[] sa=s.Split(',');
		if (sa.Length==4 && float.TryParse(sa[0], out x) && float.TryParse(sa[1], out y) &&
			float.TryParse(sa[2], out w)&& float.TryParse(sa[3], out h)) {
			rect=new RectangleF(x, y, w, h);
			return true;
		} else {
			rect=new RectangleF(0, 0, 0, 0);
			return false;
		}
	}
}

public void test(string s) {
	RectangleF rect=new RectangleF();
	bool result=rect.TryParse(s, out r1);
	log(s+"  result="+result+"  rect="+rect.ToString());
}

string s = "0.0,0.0,1.0,1.0";
RectangleF rect = RectangleF.Parse(s);

Chesnokov Yuriy wrote:

add public static methods

public static class MoreTryParse {
	public static bool TryParse(static, string s, out RectangleF rect) {
		...
	}
}

public void test(string s) {
	RectangleF rect;
	bool result=RectangleF.TryParse(s, out r1);
	log(s+"  result="+result+"  rect="+rect.ToString());
}

public static bool TryParse(static RectangleF, string s, out RectangleF rect) { ... }

public static bool TryParse(static<T>, string s, out RectangleF rect) where T:RectangleF { ... }

BobJanova wrote:

you never know where they are actually defined.

static class Parser {
    static RectangeF ToRectangeF(string s) {
        ....
    }
}