Unassigned local variable error

Question

3.00/5 (2 votes)

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i have this:

foreach (Software.dsBDD.list_table21 row in dataTable.Rows)
            {
                PictureBox box;
                MemoryStream stream;
                Panel panel;
                Label label;
                bool? pass;
                if (this.pass.HasValue && this.end)
                {
                   pass = this.pass;
                }
                if ((pass.GetValueOrDefault() && pass.HasValue) || row.view_only)

Variable "pass" near "GetValueOrDefault" underlined as an error: "Use of unassigned local variable pass". I don`t understand why this variable is unassigned because in the same line there is "pass" near "HasValue" and it is assigned. Where is my syntax error?!

Posted 22-Apr-14 6:49am

Member 10742509

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3 solutions

Solution 1

You should move the 2nd IF block inside the 1st one, because the local pass variable is initialized only inside the 1st IF.

So you should modify your code like this (I updated the code after you update your code in your provided solution):

C#

bool? pass = null;
foreach (Software.dsBDD.list_table21 row in dataTable.Rows)
            {
                PictureBox box;
                MemoryStream stream;
                Panel panel;
                Label label;
                if (this.pass.HasValue && this.end)
                {
                   pass = this.pass;
                }
                // Must test for null before to use it!
                if (pass != null && pass.GetValueOrDefault() || row.view_only)
                //..

Posted 22-Apr-14 7:01am

Raul Iloc

Updated 23-Apr-14 1:44am

v3

Solution 2

bool? pass = null; should fix this issue.

Posted 22-Apr-14 7:14am

Abhinav S

Updated 22-Apr-14 7:15am

v2

Comments

Member 10742509 22-Apr-14 13:23pm

i`ve already tried this, however, this could not be null...

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Member 10742509 · Accepted Answer · 2014-04-22T07:49:00

Solution 3

Solved like this:

i`ve defined pass before foreach scope.

C#

bool? pass = null; // ---THIS WAS ADDED
foreach (Software.dsBDD.list_table21 row in dataTable.Rows)
        {
            PictureBox box;
            MemoryStream stream;
            Panel panel;
            Label label;
            // bool? pass;   ---THIS WAS REMOVED
            if (this.pass.HasValue && this.end)
            {
               pass = this.pass;
            }
            if ((pass.GetValueOrDefault() && pass.HasValue) || row.view_only)
        }

Posted 22-Apr-14 7:49am

Member 10742509

Comments

Volynsky Alex 22-Apr-14 16:14pm

Nice answer

Raul Iloc 23-Apr-14 7:41am

Your answer to your own question is not OK, because you can get the same error again if the pass is not initialized for the first item (Row).
See my update in my solution (solution1)!

Member 10742509 23-Apr-14 7:50am

Thank you for your comment. I`ve tested my solution and it`s ok. error has gone and application works without any error.