How to convert “0” and “1” to false and true

问题

I have a method which is connecting to a database via Odbc. The stored procedure which I'm calling has a return value which from the database side is a 'Char'. Right now I'm grabbing that return value as a string and using it in a simple if statement. I really don't like the idea of comparing a string like this when only two values can come back from the database, 0 and 1.

OdbcCommand fetchCommand = new OdbcCommand(storedProc, conn);

fetchCommand.CommandType = CommandType.StoredProcedure;
fetchCommand.Parameters.AddWithValue("@column ", myCustomParameter);
fetchCommand.Parameters.Add("@myReturnValue", OdbcType.Char, 1)
            .Direction = ParameterDirection.Output;
fetchCommand.ExecuteNonQuery();

string returnValue = fetchCommand.Parameters["@myReturnValue"].Value.ToString();
if (returnValue == "1")
{
    return true;
}

What would be the proper way to handle this situation. I've tried 'Convert.ToBoolean()' which seemed like the obvious answer but I ran into the 'String was not recognized as a valid Boolean. ' exception being thrown. Am I missing something here, or is there another way to make '1' and '0' act like true and false?

Thanks!

回答1:

How about:

return (returnValue == "1");

or as suggested below:

return (returnValue != "0");

The correct one will depend on what you are looking for as a success result.

回答2:

In a single line of code:

bool bVal = Convert.ToBoolean(Convert.ToInt16(returnValue))

回答3:

If you want the conversion to always succeed, probably the best way to convert the string would be to consider "1" as true and anything else as false (as Kevin does). If you wanted the conversion to fail if anything other than "1" or "0" is returned, then the following would suffice (you could put it in a helper method):

if (returnValue == "1")
{
    return true;
}
else if (returnValue == "0")
{
    return false;
}
else
{
    throw new FormatException("The string is not a recognized as a valid boolean value.");
}

回答4:

Set return type to numeric - you don't need a char (so don't use it); a numeric value (0/1) can be converted with Convert.ToBoolean(num)

Otherwise: use Kevin's answer

回答5:

You can use that form:

return returnValue.Equals("1") ? true : false;

Or more simply (thanks to Jurijs Kastanovs):

return returnValue.Equals("1");

回答6:

Or if the Boolean value is not been returned, you can do something like this:

bool boolValue = (returnValue == "1");

回答7:

My solution (vb.net):

Private Function ConvertToBoolean(p1 As Object) As Boolean
    If p1 Is Nothing Then Return False
    If IsDBNull(p1) Then Return False
    If p1.ToString = "1" Then Return True
    If p1.ToString.ToLower = "true" Then Return True
    Return False
End Function

回答8:

(returnValue != "1" ? false : true);

回答9:

If you don't want to convert.Just use;

 bool _status = status == "1" ? true : false;

Perhaps you will return the values as you want.

来源：https://stackoverflow.com/questions/2648074/how-to-convert-0-and-1-to-false-and-true

标签

.net

ASP.NET

odbc

boolean-logic