Question

My class looks like this.

public class LogSettings
{
    public string attributeName { get; set; }//TODO: change the variable name

    public Warnings[] warnings = new Warnings[3];
}

public class Warnings
{
   public string typeOfWarning {get; set;}

    public bool isAbsolute { get; set; }

    public decimal numUpDownValue { get; set; }

    public LogSettingActions[] actionItems = new LogSettingActions[10];
}

public class LogSettingActions
{
    public string actionItem{ get; set;}
}

but when I try to create Warnings instance it throws NullReference error.

var rows = FindChilds<ctlLogConfigRow>(lvLogConfigTemplate);
foreach (var row in rows)
{
    LogSettings instance = new LogSettings();
    instance.attributeName = row.GroupHeaderText;

    var allWarnings = FindChilds<ctlWarnings>(row);

    for (int i = 0; i < allWarnings.Count; i++)
    {

       instance.warnings[i].typeOfWarning = allWarnings[i].ctlWarningGroupBoxFixedHeader1.Header.ToString();//It throws error here

Can anybody help me?

Answer 1

LogSettings.warnings is initialized as an array, but the array elements are not initialized.

Consider initialing the array items in the LogSettings constructor:

public class LogSettings
{
    public LogSettings()
    {
         warnings = new Warnings[3];
         for (int i=0; i<warnings.Length; i++)
         {
              warnings[i] = new Warnings();
         }
    }

    public string attributeName { get; set; }//TODO: change the variable name

    public Warnings[] warnings;
}