在所有名称空间中搜索名称

Question

Does Visual Studio provide a way to search down through each available namespace for suggestions when The type or namespace name '____' could not be found ?

I often forget which namespace to use for a particular object.

For example, the code below does not compile, because I omitted using System.IO; .

using System;
namespace myTest {
    class Program {
        static void Main(string[] args) {
            Stream fs = new Stream(); // <-- ERROR
        }
    }
}

Answer 1

Press CTRL + . to give you the option of adding the correct using statement (if the assembly is known) or prefixing the member with the relevant namespace.

Answer 2

Click on the class that's in a different namespace, and you should see a blue square in the corner

move your mouse over to that blue square, and an Icon should appear. click on that icon to have a list of options, one of them should be to add the appropriate namespace.

Answer 3

It provides a floating helper if you hover over the unknown class that is in the referenced libraries. Helper will suggest a namespace to add.