C#•2w ago

Out Parameter Question

I think this should be simple, but I am coming up blank on a method call with an out parameter. (The example below is basic but my actual code requires the parameters) File1.Cs

class Example
{
  public void Position(int row, int col, out string txt)
    {
      StringBuilder Data = new StringBuilder(20);
      UInt64 f = (UInt64)(row * col);
      txt=Data.ToString();
      return f;
    }
}

class Example
{
  public void Position(int row, int col, out string txt)
    {
      StringBuilder Data = new StringBuilder(20);
      UInt64 f = (UInt64)(row * col);
      txt=Data.ToString();
      return f;
    }
}

If I am trying to call the Position Method in File2.Cs

namespace Example
{
    class Example2
    {
        public void Call()
        { 
        Example p = new Example();
            p.Position(1,2,???);

namespace Example
{
    class Example2
    {
        public void Call()
        { 
        Example p = new Example();
            p.Position(1,2,???);

What do I put for the last parameter on p.Position?

6 Replies

Angius•2w ago

out string s for example Or

string s;
p.Position(1, 2, out s);

string s;
p.Position(1, 2, out s);

p.Position(1, 2, out var s);

p.Position(1, 2, out var s);

s can be any name Alternatively, in this particular example... just return that string, no need for an out parameter They're mostly used when you need a "second return" Like in case of .TryParse() methods that return a boolean denoting success, and use the out param to return the parsed value

ShockOP•2w ago

Thank you so much. In my actual usage, I'm forced to return the out as a string variable because it's passed to parse depending on the values it contains. I was blanking hard on that one

Angius•2w ago

Not sure what you mean here I'm not aware of anything that would force you into having an out parameter Unless you need to assign this method to some Action<int, int, string> But I don't think out params work with delegates

ShockOP•2w ago

Ahh - I see. I left a lot of context out in my example, but in my program I'm using a custom dll wrapper that I'm unable to adjust the parameters that are requried to be passed. By nature of usage, there should alwyas be a string output else we won't even get to call this method

Angius•2w ago

Ah, gotcha That's a weird design on that dll's part, but needs must

ShockOP•2w ago

Oh god you have no clue 💀

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Out Parameter Question