tryparse

I have following code int varOut; int.TryParse(txt1.Text, out varOut); // Here txt1.Text = 4286656181793660 Here txt1.Text is the random 16 digit number generated by JavaScript which is an integer. But the above code always return false i.e. varOut value is always zero. What I am doing wrong here ? The limit for int ( 32-bit integer) is -2,147,483,648 to 2,147,483,647 . Your number is too large. For large integer number such as your case, try to Parse using long.TryParse (or Int64.TryParse since Int64 is long in C#) instead. The limit for long number is of the range of -9.2e18 to 9.2e18 * long

UPDATE Guid.TryParse is available in .NET 4.0 END UPDATE Obviously there is no public GUID.TryParse() in .NET CLR 2.0. So, I was looking into regular expressions [aka googling around to find one] and each time I found one there was a heated argument in the comments section about RegEx A doesn't work, use RegEx B. Then someone would write Regex C yadda yadda So anyway, What I decided to do was this, but I feel bad about it. public static bool IsGuid (string possibleGuid) { try { Guid gid = new Guid(possibleGuid); return true; } catch (Exception ex) { return false; } } Obviously I don't really

I am using Datetime.TryParse method to check the valid datetime. the input date string would be any string data. but is returning false as the specify date in invalid. DateTime fromDateValue; if (DateTime.TryParse("15/07/2012", out fromDateValue)) { //do for valid date } else { //do for in-valid date } Edit: i missed. i need to check the valid date with time as "15/07/2012 12:00:00". Any suggestions are welcome.... You could use the TryParseExact method which allows you to pass a collection of possible formats that you want to support. The TryParse method is culture dependent so be very

What is the correct way to call DateTime.TryParse from F#? I am trying to test some code from F# interactive and I can't figure out how to pass a mutable DateTime into the second argument by ref. What is the in/out/ref syntax in F#? This is the method signature I'm looking at: http://msdn.microsoft.com/en-us/library/ch92fbc1.aspx?cs-save-lang=1&cs-lang=fsharp#code-snippet-1 Chris's answer is correct if you really need to pass a mutable DateTime by reference. However, it is much more idiomatic in F# to use the compiler's ability to treat trailing out parameters as tupled return values: let

I just want to know, whether a String variable contains a parsable positive integer value. I do NOT want to parse the value right now. Currently I am doing: int parsedId; if ( (String.IsNullOrEmpty(myStringVariable) || (!uint.TryParse(myStringVariable, out parsedId)) ) {//..show error message} This is ugly - How to be more concise? Note: I know about extension methods, but I wonder if there is something built-in. You could use char.IsDigit : bool isIntString = "your string".All(char.IsDigit) Will return true if the string is a number bool containsInt = "your string".Any(char.IsDigit) Will

I have the need to examine to see if an object can be converted to a specific DataType or not, and came up with this : public static bool TryParseAll(System.Type typeToConvert, object valueToConvert) { bool succeed = false; switch (typeToConvert.Name.ToUpper()) { case "DOUBLE": double d; succeed = double.TryParse(valueToConvert.ToString(), out d); break; case "DATETIME": DateTime dt; succeed = DateTime.TryParse(valueToConvert.ToString(), out dt); break; case "INT16": Int16 i16; succeed = Int16.TryParse(valueToConvert.ToString(), out i16); break; case "INT": Int32 i32; succeed = Int32.TryParse

I'm trying to convert an argument of my PowerShell script to a boolean value. This line [System.Convert]::ToBoolean($a) works fine as long as I use valid values such as "true" or "false", but when an invalid value, such as "bla" or "" is passed, an error is returned. I need something akin to TryParse, that would just set the value to false if the input value is invalid and return a boolean indicating conversion success or failure. For the record, I tried [boolean]::TryParse and [bool]::TryParse, PowerShell doesn't seem to recognize it. Right now I'm having to clumsily handle this by having two