How do I call an argument from a method to an event in C#?

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VS2017

Hello,

I have a method with a string argument. I want to call that method in an event but when I try to pass the argument, it tells me that the variable is not present in the context.

Please help.

Regards
Aman Chaurasia

What I have tried:

The method(function):

private void GetZoneTag(string ZoneArea)
        {
            ZoneCmbZoneTag.Items.Clear();
            if (ListView1.Items.Count > 1)
            {
                for (var iCount = 0; iCount < ListView1.Items.Count; iCount++)
                {
                    if (ListView1.Items[iCount].SubItems[1].Text == ZoneArea)
                    {
                        ZoneCmbZoneTag.Items.Add(ListView1.Items[iCount].SubItems[0].Text);
                    }
                }
            }
        }

The event:

private void ListView1_SelectedIndexChanged(object sender, EventArgs e)
        {
            try
            {
                GetZoneTag(ZoneArea);
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

Posted 24-May-18 19:55pm

Primo Chalice

Updated 24-May-18 20:28pm

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3 solutions

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OriginalGriff · Answer 1 · 2018-05-24T20:07:00

Solution 1

When you call a method, you pass it a value that it receives in the variable it declares in it's method header:

C#

private void GetZoneTag(string ZoneArea)

Inside the method, the value is called "ZoneArea" but that variable does not exist outside the method itself. To call it, you pass it an actual value:

C#

GetZoneTag("Hello world");

Or

C#

string zoneName = "Hello World";
...
GetZOneTag(zoneName);

Whee you get the value from, I don;t know - I have no access to the rest of your code!

Posted 24-May-18 20:07pm

OriginalGriff

Comments

Primo Chalice 25-May-18 2:22am

I am now getting this error 'InvalidArgument=Value of '0' is not valid for 'index', at line String str = ListView1.SelectedItems[0].Text, when I am clicking on the ListView

OriginalGriff 25-May-18 2:30am

Then use the debugger and find out what is in the collection - particularly since the code is not what you originally showed...
I can't see your screen, I can't access your HDD - and I don't have any access to your data! :laugh:

Member 13843821 · Answer 2 · 2018-05-24T20:18:00

private void ListView1_SelectedIndexChanged(object sender, EventArgs e)
{
String str = listView1.SelectedItems[0].Text;
try
{
GetZoneTag(str);
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}

Here u are passing a value which is a Zone but Zone is not Present in ListView and u need to fetch that value first and after pass it to the function, u don't have
declaration or initilization for the zone therefore it giving a error " the variable is not present in the context " try it.

Member 13843821 · Answer 3 · 2018-05-24T20:29:00

rivate void listView1_SelectedIndexChanged(object sender, EventArgs e)
{
String str = "";

if (listView1.SelectedItems.Count > 0)
{
if (listView1.SelectedItems[0].Tag != null)
{
str = listView1.SelectedItems[0].Tag.ToString();
GetZoneTag(str);
}
else
{
str = "";
}
}
}

How do I call an argument from a method to an event in C#?

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How do I call an argument from a method to an event in C#?

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