how to fix operator '==' is ambiguous on operands of type ulong and long

Question

I\'m currently building a new command in my Discord Server and i\'m struggling to convert the UserId back to the Users Nickname in my server.

i am getting error message

Answer 1

Try casting memberId to a ulong (or UInt64) so the type matches x.Id:

var memberId = (ulong)reader.GetInt64(0);
string name = Context.Guild.Users
    .Where(x => x.Id == memberId)
    ...
    ...

Also, you have a few other things to fix as the other answer and comments suggest. ;)

Answer 2

In the .Where(x => x.Id = memberId), you should use == to compare instead of = (attribution) like you did before.

Int64 memberId = reader.GetInt64(0);
string name = Context.Guild.Users
    .Where(x => x.Id == memberId)
    .First()
    .Nickname != null 
        ? Context.Guild.Users.Where(x => x.Id == memberId).First().Nickname 
        : Context.Guild.Users.Where(x => x.Id == memberId).First().Username;
Int64 votes = reader.GetInt64(2);
GOTWVote.Add($@"{name} has received {votes} vote(s)");

But you could refactor this code to this (read to comments):

var memberId = reader.GetInt64(0);
// search for the user just a single time!
var user = Context.Guild.Users.First(x => x.Id == memberId);

// apply the rule to define the name string
string name = @string.IsNullOrEmpty(user.Nickname) ? user.Nickname : user.Username;

var votes = reader.GetInt64(2);
GOTWVote.Add($@"{name} has received {votes} vote(s)");

Answer 3

The first step is to cast to resolve the ambiguous operator. Next, rearrange your query to get rid of the two extra subqueries:

Int64 memberId = reader.GetInt64(0);
var user = Context.Guild.Users
    .Where(x => x.Id == (UInt64)memberId)
    .First();

string name = 
    user.Nickname != null 
        ? user.Nickname 
        : user.Username;

Int64 votes = reader.GetInt64(2);
GOTWVote.Add($@"{name} has received {votes} vote(s)");