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Error: Cannot implicitly convert type 'int' to 'string'

Posted on 2004-04-01
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Last Modified: 2012-08-14
Error: Cannot implicitly convert type 'int' to 'string'
I keep getting this message. How do I take user input from a text box and place it in an integer variable? Also, I know the IsNumeric() test from Visual Basic 6; is there any numeral test like that in C#?
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Question by:Miatchguy
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4 Comments
 
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by:eric_duncan
ID: 10738143
You can use the Int32.Parse() method to convert a string to an integer. For example:

string s = "123";
int x = Int32.Parse(s);

will set the variable x to an integer value of 123. For more information about the Int32.Parse() function, including the exceptions it throws, check out the following link:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemint32classparsetopic1.asp

Hope this helps!

Eric
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eric_duncan earned 125 total points
ID: 10738156
Sorry - I just realized I didn't answer your exact question, which was how to convert a value in a TextBox to an integer. The code to do that is:

int x = Int32.Parse(textbox.Text);

Eric
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Expert Comment

by:AlexFM
ID: 10738921
In addition to eric_duncan's answer: Instead of VB IsNumeric() function catch exception which is thrown by Int32.Parse if string is not numeric:

try
{
    x = Int32.Parse(textbox.Text);
}
catch ( Exception ex )
{
    // string cannot be converted
}

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Expert Comment

by:AdrianJMartin
ID: 10740970
In addition:-
The Double.TryParse(...) method
http://msdn.microsoft.com/library/en-us/cpref/html/frlrfSystemDoubleClassTryParseTopic.asp?frame=true

The big advantage of this is that it does not throw an exception if it can't interpret the string. You should not code expecting to catch exceptions, exceptions take time to propigate and can REALLY effect the performance of your app.
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