out keyword - initialize

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Hi,
I get the following errors on the following code.

Error 1 The out parameter 'dtValueToCheck' must be assigned to before control leaves the current method

Error 2 The out parameter 'strValueToCheck' must be assigned to before control leaves the current method

Error 3 The out parameter 'strFieldNameToCheck' must be assigned to before control leaves the current method

Error 5 No overload for method 'ValidateCriteria' takes 5 arguments

What am I doing wrong please?
Thanks

C#

private bool ValidateAssetCriteria(DataTable dtToCheck, string strAssetName)
        {
            string strFieldNameToCheck = string.Empty;
            string strValueToCheck = string.Empty;
            DateTime dtValueToCheck = DateTime.Now;

            bool validate = ValidateCriteria(dtToCheck, strAssetName,
                                                           out strFieldNameToCheck, out strValueToCheck,
                                                           out dtValueToCheck);

           
        }

public static bool ValidateCriteria(DataTable dtToCheck, string strAssetName,
                                            out string strFieldNameToCheck, out string strValueToCheck,
                                            out DateTime dtValueToCheck)
        {

...
...
strFieldNameToCheck = "fieldname";
strValueToCheck = "value";
dtValueToCheck = DateTime.now

}

Posted 14-Oct-11 4:30am

arkiboys

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2 solutions

Solution 1

I'm betting you have a return statement before the code block you included in the ValidateCriteria and thus the parameters has not been set.

You have to set the three out parameters before any return statement.

Posted 14-Oct-11 4:36am

Simon Bang Terkildsen

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Espen Harlinn 15-Oct-11 4:22am

Right :)

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BobJanova · Accepted Answer · 2011-10-14T04:57:00

The clue's in the error message. An out parameter must be assigned, however the method executes, i.e. there must be no way of returning from the method without assigning them.

If you're passing out parameters, there's no point initialising them first; the method you pass to them must assign new values. If you want your method to be able to, but not required to, update the values, you should use ref, not out.

I guess the parameter count message is because these two things are in different projects and the compile on the first fails, because it looks like five parameters from here.