Question

I am trying to check for ascending order in this array
But not sure how to use a foreach

 foreach (double d in dSize)
        {

            if (dSize.ToString() != null)
            {
                double dSize1;
                string str1 = dSize.ToString();

                bool success1 = double.TryParse(str1, out dSize1);
                if ( dSize < 0.0)
                {
                    errMsg1 = " data grid should contain number >= 0";
                }
                //else
                //{
                //    errMsg1 = " data grid must be entered";
                //}
            }


                *if (inputs.dSize[rowCount] <= inputs.dSize[rowCount - 1])
                {
                    errMsg = "value in row " + (rowCount + 1) + " should be greater than the value in row " + rowCount;
                }
            }*
            swRpt.WriteLine(errMsg);
        }

I’ve done the second part using a for loop. Would like to change it to a foreach

Answer 1

You just need to remember the previous value from one iteration to the next. The issue with using foreach for this (as opposed to the raw iterator) is that you need a special case for the first value:

Double lastDouble = null;
foreach(double d in dSize) {
    if ((lastDouble != null) && (lastDouble > d)) {
        errMsg = "value out of sequence";
        break;
    }
    lastDouble = d;
}

but then you’ve lost the row number for the error. You could also prime your last value from the first entry and skip one using LINQ

double lastDouble = dSize.First();
foreach(double d in dSize.Skip(1)) {
    if (lastDouble > d) {
        errMsg = "value out of sequence";
        break;
    }
    lastDouble = d;
}