how to convert an int

Question

HI, Am getting an error on this line ; it says input string was not incorrect format please help... int userid = Convert.ToInt32(Selected_List.SelectedItems[0].SubItems[0].Text.ToString());

Selva Ganapathy · Answer

Hi Enos, You can use either intTryParse or Int16Converter class to achieve this if(new Int16Converter().IsValid(Selected_List.SelectedItems[0].SubItems[0].Text.ToString())) { int userid = Convert.ToInt32(Selected_List.SelectedItems[0].SubItems[0].Text.ToString() } else { // Message } Regards, Selva Ganapathy K

Vulpes · Answer

Try instead: int userid; bool isValid = int.TryParse(Selected_List.SelectedItems[0].SubItems[0].Text, out userid); if (isValid) { _imageId = userid; } else { // perhaps issue some warning to user }

Michal Habalcik · Answer

because the parse didn't go through. You are obviously trying to convert something non-numeric. Try to check what are you actually trying to parse: Console.WriteLine(Selected_List.SelectedItems[0].SubItems[0].Text)

Enos · Answer

now giving error on this code... _imageId = userid; Use of unassigned local variable 'userid'

vaibhav bhargav · Answer

Hi, Check what you are getting for Selected_List.SelectedItems[0].SubItems[0].Text. It may contain something that can not be INT,further Text property itself of type 'string',.Tostring() is not required so change Convert.ToInt32(Selected_List.SelectedItems[0].SubItems[0].Text.ToString()); to Convert.ToInt32(Selected_List.SelectedItems[0].SubItems[0].Text);

Michal Habalcik · Answer

this should do the job. Also, I recommend to write the output to the console so you can check what values are you trying to parse. Or you can easily debug it. int result = int .MinValue; int userid; int .TryParse( Selected_List .SelectedItems[0].SubItems[0].Text, out result); if (result != int .MinValue) userid = result;

Manish Kumar Choudhary · Answer

Hi Enos , it means that Selected_List.SelectedItems[0].SubItems[0].Text does not contains a value that can be converted to int. so user Int32 .TryParse( Selected_List.SelectedItems[0].SubItems[0].Text , out result); if it contains the data which cannot convert to int then it will return false. and no need of .ToString() also there.

how to convert an int

Answers (7)