C# passing values from one method to another

问题

I am getting an error code in the result. code below. I am basically trying to get a data set from SingleColumn method and use it in SMA method. But I am getting results deos not exist in current context.

static public void SMA()
{
    double[] closePrice = results.ToArray();

Below you can see the SingleColumn and part of SMA code.

#region Single Column
//static public double results;
static public void SingleColumn(IEnumerable<string> strs, int highNum)
{
    #region spilt data to columns
    Console.WriteLine("Single Column Query:");
    var columnQuery = from line in strs 
                      let elements = line.Split(',')
                      select Convert.ToDouble(elements[highNum]); 
    var results = columnQuery.ToList();
    double[] closePrice = results.ToArray();
    #endregion

    #region max, min, avg
    double average = results.Average();
    double max = results.Max();
    double min = results.Min();
    Console.WriteLine("High: {0}: Low: {1}: Average: {2:0.00}", max, min, average);
    #endregion
}

    #region Strategy Code SMA
static public void SMA()
{
    double[] closePrice = results.ToArray(); 
    int TOTAL_PERIODS = closePrice.Length;
    double[] output = new double[TOTAL_PERIODS];
    int begin;
    int length;

    for (int i = 0; i < closePrice.Length-TOTAL_PERIODS; i++) //had to change from -1 to -TOTAL_PERIODS
    {
        closePrice[i] = (double)i;
    }

    TicTacTec.TA.Library.Core.RetCode retCode = Core.Sma(0, closePrice.Length-1, closePrice, PERIODS_AVERAGE, out begin, out length, output);

回答1:

You have some options:

have SingleColumn return results and add that as a parameter to SMA
make results a field of the class so it is shared.

Option 1. is cleaner since it forces callers to call SingleColumn first (or come up with a list on their own)

    static public double[] SingleColumn(IEnumerable<string> strs, int highNum)
    {
        ...
        return closePrice;
    }

        #region Strategy Code SMA
    static public void SMA(double[] closePrice)
    {
        int TOTAL_PERIODS = closePrice.Length;
        double[] output = new double[TOTAL_PERIODS];
        ...
    }

Note that I changed your output/input from result to closePrice since it was just converting it to a List and back. It's cleaner just to leave it as a double[]. You can also clean up the code a bit by just using ToArray instead of using ToList and then ToArray.

回答2:

You should use static variable.

private static IEnumerable<double> result;

and then in method SingleColumn asign columnQuery.ToList() to this variable

回答3:

Each variable in C# is exists within a scope which is defined by curly braces. In your case the variable result is within the scope SingleCloumn.

public static void SingleColumn(IEnumerable<string> strs, int highNum)
{

}

To use result in another scope, you can make "result" as a global variable. As I can see you have commented out

//static public double results;

first un-comment it and remove var from

var results = columnQuery.ToList();

Hope this helps.

来源：https://stackoverflow.com/questions/28479524/c-sharp-passing-values-from-one-method-to-another

标签

static-methods