Visual Studio 2015 suddenly don't want to create new variables in classes [closed]

Answer 1

Error   CS1519  Invalid token '=' in class, struct, or interface member declaration AGDS
Error   CS0103  The name 'b' does not exist in the current context. AGDS

These two messages are a bit vague, but they are correct. In the code example, it is attempting to act like code within a method or function. Put that same code into a method or function and it will work.

If you intended b to be a field or property... You can shrink the declaration and assignment to one line. For a property use Getters and Settters.

Answer 2

Is it possible to declare variables then assign values to those variables outside of a function?

Try to do this:

public class Similarity
{
    public string index;
    public double distance;
    public double similarityRate;
    public Similarity(string index, double distance)
    {
        this.index = index;
        this.distance = distance;
    }

    int b = 100;  //new code
}

Answer 3

You are able to set a default value for the b member like this: int b = 100;. However, after the member declaration, you won't be able to assign a value to b member outside a function. When you want to assign a value to a member, you should determine when it should be done. So if you want to set the b value when a instance of Similarity is created, you can assign it in the class constructor:

int b;
public string index;
public double distance;
public double similarityRate;
public Similarity(string index, double distance)
{
    this.index = index;
    this.distance = distance;
    b = 100;
}

On a side note, if you want to declare b as a public property, the right way to do this would be public int b {get; set;}. Since C# 6, you can also set a default value directly to the a property: public int b {get; set;} = 100;