how can i convert a string to a Decimal(10,2) in C#?
Take a look at Decimal.TryParse, especially if the string is coming from a user.
You'll want to use TryParse if there's any chance the string cannot be converted to a Decimal. TryParse allows you to test if the conversion will work without throwing an Exception.
You got to be careful with that, because some cultures uses dots as a thousands separator and comma as a decimal separator.
My proposition for a secure string to decimal converstion:
public static decimal parseDecimal(string value)
{
value = value.Replace(" ", "");
if (System.Globalization.CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator == ",")
{
value = value.Replace(".", ",");
}
else
{
value = value.Replace(",", ".");
}
string[] splited = value.Split(System.Globalization.CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator[0]);
if (splited.Length > 2)
{
string r = "";
for (int i = 0; i < splited.Length; i++)
{
if (i == splited.Length - 1)
r += System.Globalization.CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator;
r += splited[i];
}
value = r;
}
return decimal.Parse(value);
}
The loop is in case that string contains both, decimal and thousand separator
Try:
string test = "123";
decimal test2 = Convert.ToDecimal(test);
//decimal test2 = Decimal.Parse(test);
//decimal test2;
// if (decimal.TryParse(test, out result))
//{ //valid }
//else
//{ //Exception }
labelConverted.Text = test2.toString();
Decimal Examples
Difference between Convert.ToDecimal(string) & Decimal.Parse(string)
Regards
Related
As these questions point out, Guid.NewGuid will return the same value for all rows due to the enforced deterministic nature of U-SQL i.e if it's scaled out if an element (vertex) needs retrying then it should return the same value....
Guid.NewGuid() always return same Guid for all rows
auto_increment in U-SQL
However.... the code example in the officials documentation for a User Defined Extractor purposefully uses Guid.NewGuid().
I'm not querying the validity of the answers for the questions above, as they are from an authoritative source (the programme manager for u-sql, so very authoritative!). However, what I'm wondering if the action of using an Extractor means NewGuid can be used as normal? Is it simply within c# expressions in u-sql and User Defined Functions in which NewGuid is unsafe?
[SqlUserDefinedExtractor(AtomicFileProcessing = true)]
public class FullDescriptionExtractor : IExtractor
{
private Encoding _encoding;
private byte[] _row_delim;
private char _col_delim;
public FullDescriptionExtractor(Encoding encoding, string row_delim = "\r\n", char col_delim = '\t')
{
this._encoding = ((encoding == null) ? Encoding.UTF8 : encoding);
this._row_delim = this._encoding.GetBytes(row_delim);
this._col_delim = col_delim;
}
public override IEnumerable<IRow> Extract(IUnstructuredReader input, IUpdatableRow output)
{
string line;
//Read the input line by line
foreach (Stream current in input.Split(_encoding.GetBytes("\r\n")))
{
using (System.IO.StreamReader streamReader = new StreamReader(current, this._encoding))
{
line = streamReader.ReadToEnd().Trim();
//Split the input by the column delimiter
string[] parts = line.Split(this._col_delim);
int count = 0; // start with first column
foreach (string part in parts)
{
if (count == 0)
{ // for column “guid”, re-generated guid
Guid new_guid = Guid.NewGuid();
output.Set<Guid>(count, new_guid);
}
else if (count == 2)
{
// for column “user”, convert to UPPER case
output.Set<string>(count, part.ToUpper());
}
else
{
// keep the rest of the columns as-is
output.Set<string>(count, part);
}
count += 1;
}
}
yield return output.AsReadOnly();
}
yield break;
}
}
https://learn.microsoft.com/en-us/azure/data-lake-analytics/data-lake-analytics-u-sql-programmability-guide#use-user-defined-extractors
Need help checking for a specific value in List<T> foreach loop. If there is specific value then display a specific string value.
For example how do I…
If (value.something_2 == "Null")
{
value.something_2 == ".";
}
Elseif (value.something_2 == " ")
{
value.something_2 == "0";
}
How would I incorporate the above example within the “foreach” loop?
See code below.
protected void MyReport(string filename, IMyRepository repository)
{
using (FileStream fileStream = new FileStream(Server.MapPath(#"~/Includes/") + filename, FileMode.Create))
{
using (StreamWriter writer = new StreamWriter(fileStream))
{
List<Report> _report = repository.GetMyReport().ToList();
foreach (var value in _report)
{
String row01 = String.Format("{0, -10}{1, 23}{2, 120}{3, 8}",
value.somthing_1,
values.something_2,
value.something_3);
String row02 = String.Format("{0, -10}{1, 23}{2, 120}{3, 8}",
value.somthing_4,
values.something_5,
value.something_6);
Writer.WriteLine(row01);
Writer.WriteLine(row02);
}
}
writer.Close();
}
}
There is no clever built-in String.Format that you can do for this if that's what you have in mind. However, the compiler has some tricks that can reduce the amount of code you need to write e.g.
// if it's null, assign it to "."
var s2 = value.something_2 ?? ".";
// it can never be null here, so if there is whitespace default to "0"
value.something_2 = String.IsNullOrWhitespace(s2) ? "0" : s2;
If I'm understanding what you're saying, it might be easier just to have another function returning the (possibly) modified string and just pass each of your values into it, inline.
Sting row01 = String.Format("{0, -10}{1, 23}{2, 120}{3, 8}", myFunc(value.somthing_1), myFunc(values.something_2), myFunc(value.something_3));
and then have this in the same class
private string myFunc(string something){
if (something == “Null”){
return “.“;
} else if (something == “ “) {
return “0”;
} else {
return something;
}
}
I must display very small values (capacitor) in a Flex-AdvancedDataGrid
I use spark.formatters.NumberFormatter.
If I use 3, 6 or 9 for fractionalDigits, everything is fine.
But if I use 12, because I need 12 digits after decimal separator, then the value is cut after 9 digits!
Is there a way to get more then 9 digits after separator.
Or is there a way to use a formatting like "4.7 E-12" (Must be E-9, E-12, E-15 and so on)
toPrecision and toFixed works fine up to 20 digits. Thats enough.
I will write a function on this base to get results like 4.7 E-12.
Thanks for the help
Jan
I created a custom pattern formatter class that allows you to specify how you want a string/number formatted using whatever symbols or structure you want. Depending on your requirements, this may help you. Feel free to modify this class as needed.
CustomPatternFormatter.as
package
{
import mx.formatters.Formatter;
public class CustomPatternFormatter extends Formatter
{
private static const VALID_PATTERN_CHARACTERS:String = "#,.-";
// Use # as a placeholder for a regular
// character in the input string.
// Then add other characters between the
// # symbol for the desired output format.
// ex. The pattern ##,##,##.## with input 12345678
// will output 12,34,56.78
public var formatPattern:String;
// If True, the input string must match the number
// of # characters in the formatPattern.
public var inputMustMatchPatternLength:Boolean;
//Constructor
public function CustomPatternFormatter()
{
super();
formatPattern = "";
inputMustMatchPatternLength = false;
}
// Override format().
override public function format(value:Object):String
{
// Reset error if it exists.
if (error)
error = null;
// If value is null, or empty String just return ""
// but treat it as an error for consistency.
// Users will ignore it anyway.
if (!value || (value is String && value == ""))
{
error = "Cannot convert an empty value";
return "";
}
// Check to see if the input value must match the format pattern
if (inputMustMatchPatternLength && String(value).length != countOccurrences(formatPattern, "#"))
{
error = "The input value length does not match the format pattern length.";
return "";
}
// If the value is valid, format the string.
var fStrLen:int = 0;
var letter:String;
var n:int;
var i:int;
var v:int;
// Make sure the formatString is valid.
n = formatPattern.length;
for (i = 0; i < n; i++)
{
letter = formatPattern.charAt(i);
if (letter == "#")
{
fStrLen++;
}
else if (VALID_PATTERN_CHARACTERS.indexOf(letter) == -1)
{
error = "You can only use the following symbols in the formatPattern: " + VALID_PATTERN_CHARACTERS;
return "";
}
}
var returnString:String = "";
var vStr:String = String(value).replace(".", "").split("").reverse().join("");
var fArr:Array = formatPattern.split("").reverse();
var fChar:String;
// Format the string
for (v = 0; v < vStr.length; v++) { if (fArr.length > 0)
{
do
{
fChar = fArr.shift();
if (fChar != "#")
returnString += fChar;
} while (fChar != "#" && fArr.length > 0);
}
returnString += vStr.charAt(v);
}
// Return the formatted string
return returnString.split("").reverse().join("");
}
protected function countOccurrences(str:String, char:String):int
{
var count:int = 0;
for (var i:int=0; i < str.length; i++)
{
if (str.charAt(i) == char)
{
count++;
}
}
return count;
}
}
}
I have some issues with Arduino about how to match text.
I have:
String tmp = +CLIP: "+37011111111",145,"",,"",0
And I am trying to match:
if (tmp.startsWith("+CLIP:")) {
mySerial.println("ATH0");
}
But this is not working, and I have no idea why.
I tried substring, but the result is the same. I don't know how to use it or nothing happens.
Where is the error?
bool Contains(String s, String search) {
int max = s.length() - search.length();
for (int i = 0; i <= max; i++) {
if (s.substring(i) == search) return true; // or i
}
return false; //or -1
}
Otherwise you could simply do:
if (readString.indexOf("+CLIP:") >=0)
I'd also recommend visiting:
https://www.arduino.cc/en/Reference/String
I modified the code from gotnull. Thanks to him to put me on the track.
I just limited the search string, otherwise the substring function was not returning always the correct answer (when substrign was not ending the string). Because substring search always to the end of the string.
int StringContains(String s, String search) {
int max = s.length() - search.length();
int lgsearch = search.length();
for (int i = 0; i <= max; i++) {
if (s.substring(i, i + lgsearch) == search) return i;
}
return -1;
}
//+CLIP: "43660417XXXX",145,"",0,"",0
if (strstr(command.c_str(), "+CLIP:")) { //Someone is calling
GSM.print(F("ATA\n\r"));
Number = command.substring(command.indexOf('"') + 1);
Number = Number.substring(0, Number.indexOf('"'));
//Serial.println(Number);
} //End of if +CLIP:
This is how I'm doing it. Hope it helps.
if (tmp.startsWith(String("+CLIP:"))) {
mySerial.println("ATH0");
}
You can't put the string with quotes only you need to cast the variable :)
How can I use Membership.GeneratePassword to return a password that ONLY contains alpha or numeric characters? The default method will only guarantee a minimum and not a maximum number of non alphanumeric passwords.
string newPassword = Membership.GeneratePassword(15, 0);
newPassword = Regex.Replace(newPassword, #"[^a-zA-Z0-9]", m => "9" );
This regular expression will replace all non alphanumeric characters with the numeric character 9.
I realised that there may be ways of doing this. The GUID method is great, except it doesn't mix UPPER and lower case alphabets. In my case it produced lower-case only.
So I decided to use the Regex to remove the non-alphas then substring the results to the length that I needed.
string newPassword = Membership.GeneratePassword(50, 0);
newPassword = Regex.Replace(newPassword, #"[^a-zA-Z0-9]", m => "");
newPassword = newPassword.Substring(0, 10);
A simple way to get an 8 character alphanumeric password would be to generate a guid and use that as the basis:
string newPwd = Guid.NewGuid().ToString().Substring(0, 8);
If you need a longer password, just skip over the dash using substrings:
string newPwd = Guid.NewGuid().ToString().Substring(0, 11);
newPwd = newPwd.Substring(0, 8) + newPwd.Substring(9, 2); // to skip the dash.
If you want to make sure the first character is alpha, you could just replace it when needed with a fixed string if (newPwd[0] >= '0' && newPwd[0] <= '9')...
I hope someone can find this helpful. :-)
You could also try to generate passwords and concatenate the non alphanumeric characters until you reach the desired password length.
public string GeneratePassword(int length)
{
var sb = new StringBuilder(length);
while (sb.Length < length)
{
var tmp = System.Web.Security.Membership.GeneratePassword(length, 0);
foreach(var c in tmp)
{
if(char.IsLetterOrDigit(c))
{
sb.Append(c);
if (sb.Length == length)
{
break;
}
}
}
}
return sb.ToString();
}
There is similar approach with breigo's solution.
Maybe this is not so effective but so clear and short
string GeneratePassword(int length)
{
var password = "";
while (password.Length < length)
{
password += string.Concat(Membership.GeneratePassword(1, 0).Where(char.IsLetterOrDigit));
}
return password;
}
I also prefer the GUID method - here's the short version:
string password = Guid.NewGuid().ToString("N").Substring(0, 8);
Going from #SollyM's answer, putting a while loop around it, to prevent the very unlikely event of all characters, or too many characters being special characters, and then substring throwing an exception.
private string GetAlphaNumericRandomString(int length)
{
string randomString = "";
while (randomString.Length < length)
{
//generates a random string, of twice the length specified, to counter the
//probability of the while loop having to run a second time
randomString += Membership.GeneratePassword(length * 2, 0);
//replace non alphanumeric characters
randomString = Regex.Replace(randomString, #"[^a-zA-Z0-9]", m => "");
}
return randomString.Substring(0, length);
}
This is what I use:
public class RandomGenerator
{
//Guid.NewGuid().ToString().Replace("-", "");
//System.Web.Security.Membership.GeneratePassword(12, 0);
private static string AllowChars_Numeric = "0123456789";
private static string AllowChars_EasyUpper = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static string AllowChars_EasyLower = "0123456789abcdefghijklmnopqrstuvwxyz";
private static string AllowChars_Upper_Lower = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
private static string AllowedChars_Difficult = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz##$^*()";
public enum Difficulty
{
NUMERIC = 1,
EASY_LOWER = 2,
EASY_UPPER = 3,
UPPER_LOWER = 4,
DIFFICULT = 5
}
public static string GetRandomString(int length, Difficulty difficulty)
{
Random rng = new Random();
string charBox = AllowedChars_Difficult;
switch (difficulty)
{
case Difficulty.NUMERIC:
charBox = AllowChars_Numeric;
break;
case Difficulty.EASY_LOWER:
charBox = AllowChars_EasyUpper;
break;
case Difficulty.EASY_UPPER:
charBox = AllowChars_EasyLower;
break;
case Difficulty.UPPER_LOWER:
charBox = AllowChars_Upper_Lower;
break;
case Difficulty.DIFFICULT:
default:
charBox = AllowedChars_Difficult;
break;
}
char[] chars = new char[length];
for (int i=0; i< length; i++)
{
chars[i] = charBox[rng.Next(0, charBox.Length)];
}
return new string(chars);
}
}