An unhandled exception of type 'System.NullReferenceException' occurred in Aplikasi Penjadwalan Pegawai.exe

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An unhandled exception of type 'System.NullReferenceException' occurred in Aplikasi Penjadwalan Pegawai.exe

Additional information: Object reference not set to an instance of an object.

C#

sw.Write("\n* Pegawai tertentu tidak bisa bekerja pada shift tertentu\n");
            for(int i=1; i<=dataGridView1.RowCount; i++)
            {
                shiftlibur = dataGridView1.Rows[i-1].Cells["ShiftLiburdgv"].FormattedValue.ToString();
                string[] arrayShiftLib = Regex.Split(shiftlibur, @" ");
                for(int lib = 0; lib<=2; lib++)
                {
                    if(arrayShiftLib[lib].ToString() == "Shift_1")
                    {
                        for(j = 1; j <= 7;j++)
                        {
                            sw.Write("1 S"+i +j +"1");
                            if(j != 7)
                            {
                                sw.Write(" +");
                            }
                            else
                            {
                                sw.Write(" = 0;\n");
                            }
                        }
                    }
                    if(arrayShiftLib[lib].ToString() == "Shift 2")
                    {
                        for(j=1; j<=7; j++)
                        {
                            sw.Write("1 S"+i+j+ "2");
                            if(j !=7)
                            {
                                sw.Write(" +");
                            }
                            else
                            {
                                sw.Write(" = 0;\n");
                            }
                        }
                    }
                    if(arrayShiftLib[lib].ToString() == "Shift 3")
                    {
                        for(j=1; j<=7; j++)
                        {
                            sw.Write("1 S"+i+j+"3");
                            if(j !=7)
                            {
                                sw.Write(" +");
                            }
                            else
                            {
                                sw.Write(" = 0;\n");
                            }
                        }
                    }
                }
            }

Posted 1-Oct-15 1:17am

iismarya

Updated 1-Oct-15 1:30am

CHill60

v2

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Comments

CHill60 1-Oct-15 7:31am

In which line does the error occur?
Have you tried debugging the program?

iismarya 1-Oct-15 7:37am

sw.Write("\n* Pegawai tertentu tidak bisa bekerja pada shift tertentu\n");
for(int i=1; i<=dataGridView1.RowCount; i++)
{
shiftlibur = dataGridView1.Rows[i-1].Cells["ShiftLiburdgv"].FormattedValue.ToString();
string[] arrayShiftLib = Regex.Split(shiftlibur, @" ");
for(int lib = 0; lib<=2; lib++)
{
if(arrayShiftLib[lib].ToString() == "Shift_1") //this line
{
for(j = 1; j <= 7;j++)
{
sw.Write("1 S"+i +j +"1");
if(j != 7)
{
sw.Write(" +");
}
else
{
sw.Write(" = 0;\n");
}
}
}
if(arrayShiftLib[lib].ToString() == "Shift 2")
{
for(j=1; j<=7; j++)
{
sw.Write("1 S"+i+j+ "2");
if(j !=7)
{
sw.Write(" +");
}
else
{
sw.Write(" = 0;\n");
}
}
}
if(arrayShiftLib[lib].ToString() == "Shift 3")
{
for(j=1; j<=7; j++)
{
sw.Write("1 S"+i+j+"3");
if(j !=7)
{
sw.Write(" +");
}
else
{
sw.Write(" = 0;\n");
}
}
}
}
}

CHill60 1-Oct-15 9:19am

That is not a single line of code! You've just reposted the original code.

2 solutions

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CHill60 · Answer 1 · 2015-10-01T03:38:00

arrayShiftLib[lib] does not contain anything for lib = 0,1 or 2 so the .ToString() method will fail.

When looping through any collection, do not use explicit ranges - rather check that you are within the collection - here are 3 different examples of how to do that.

for (int i = 0; i < arrayShiftLib.Length; i++)

for (int i = 0; i <= arrayShiftLib.GetUpperBound(0); i++)

foreach(string s in arrayShiftLib)

To check for nulls you could use

if (!String.IsNullOrEmpty(arrayShiftLib[i]))

Naveen.Sanagasetti · Answer 2 · 2015-10-01T01:32:00

Solution 1

The main cause of this error is if you are trying to access data using null reference at that you got this type of error;

How to resolve this : Identify in which line you got this error and check the null case before access it.

Posted 1-Oct-15 1:32am

Naveen.Sanagasetti

Comments

iismarya 1-Oct-15 7:41am

<blockquote class="quote"><div class="op">Quote:</div>

for(int lib = 0; lib<=2; lib++)
{
if(arrayShiftLib[lib].ToString() == "Shift_1") //this line
}
}</blockquote>

btw, how to check the null case?

F-ES Sitecore 1-Oct-15 10:18am

http://www.codeproject.com/Articles/79508/Mastering-Debugging-in-Visual-Studio-A-Beginn