Equivalent of += for prefixing

Is there a bit of syn开发者_JAVA百科tactic sugar for prefixing data to the beginning of a string in a similar way to how += appends to a string?

Just use:

x = "prefix" + x;

There's no compound assignment operator that does this.

sorry = "nope, " + sorry;

You could always write an extension method:

public static class StringExtensions{

    public static string Prefix(this string str, string prefix){
        return prefix + str;
    }

}

var newString = "Bean".Prefix("Mr. ");

It's not syntactic sugar, but easy nonetheless. Although it is not really any simpler than what has already been suggested.

There is no =+ operator in C#, but thankfully OO comes to the rescue here:

string value = "Jamie";
value = value.Insert(0, "Hi ");

For more info on string.Insert: http://msdn.microsoft.com/en-us/library/system.string.insert.aspx

I would agree that a = b + a seems the most sensible answer here. It reads much better than using string.Insert that's for sure.

These are methods from the FCL that can be used to merge strings, without having to use any concatenation operator. The + and += operators are prone to using a lot of memory when called repeatedly (i.e. a loop) because of the nature of strings and temp strings created. (Edit: As pointed out in comments, String.Format is often not an efficient solution either)

It's more of a syntactic alternative than sugar.

string full = String.Format("{0}{1}{2}", "prefix", "main string", "last string");

^ More info on String.Format at MSDN.

Edit: Just for two strings:

string result = string.Concat("prefix", "last part");

^ More info on String.Concat.