换行符未添加到字符串

Question

This is my test code

public string myMethod(int[,] anArray)
{
    string aString = "";

    for (int i = 0; i < anArray.GetLength(0); i++)
    {
        for (int j = 0; j < anArray.GetLength(1); j++)
        {
            if (j == anArray.Length - 1)
            {
                aString += " " + anArray[i, j] + "\r\n";
                continue;
            }
            aString += anArray[i, j] + "|";
        }
    }
    return aString; 
}

When I call the method, I'm expecting a string that has newline characters in it.

My desired result

0|0|0
0|0|0
0|0|0

However I get this

0|0|0|0|0|0|0|0|0|

Thanks.

EDIT: Silly mistake on the if condition, nothing more.

2nd EDIT: I had the wrong if condition statement in the latter portion of my code, leading to an incorrect string.

Answer 1

String is immutable that is inefficient.

StringBuild sb = new StringBuilder();
for ()
{
   sb.AppendLine(" " + anArray[i, j]);
}

As per the comment

anArray.GetLength(1) 
anArray.Length  

Not the same

Answer 2

if (j == anArray.Length - 1) replaced by if (j == anArray.GetLength(1) - 1)

public string myMethod(int[,] anArray)
{
    string aString = "";
    for (int i = 0; i < anArray.GetLength(0); i++)
    {
        for (int j = 0; j < anArray.GetLength(1); j++)
        {
            if (j == anArray.GetLength(1) - 1)
            {
                aString += anArray[i, j] + "\r\n";
                continue;
            }
            aString += anArray[i, j] + "|";
        }
    }
    return aString;
}

Answer 3

Code should look like this:

if (j == anArray.GetUpperBound(1))
{
    aString += anArray[i, j] + "\r\n";
    continue;
}