Read grades from file, incorrect format for converting string to double error
0
I am reading a string from file and I try to convert it to double, but it says:
1.55
Unhandled Exception: System.FormatException: Input string was not in a
correct format. at System.Number.ParseDouble(String value,
NumberStyles options, NumberFormatInfo numfmt) at
System.Convert.ToDouble(String value) at ConsoleApp6.Logic.read()
in C:UserssashkSourceReposConsoleApp6ConsoleApp6Class2.cs:line
123 at ConsoleApp6.Program.Main(String args) in
C:UserssashkSourceReposConsoleApp6ConsoleApp6Program.cs:line 19
It prints the first grade but it blocks on the second double, I don't know the reason why. Here is the code:
public void read(){
string textes = File.ReadAllLines(@"C:UserssashkSourceReposConsoleApp6ConsoleApp6save.txt", Encoding.Default);
double gread = new double[40];
var excluded = new { "Name:", "FacultyNumber:", "Grades:", "AverageGrade:" };
var dot = "," ;
List<string> texts = new List<string>();
int i = 0;
int z = 0;
foreach (string text in textes){
string words = textes[i].Split(' ');
for (int j = 0; j < words.Length; j++){
if (!excluded.Contains(words[j])){
texts.Add(words[j]);
// Console.WriteLine(words[j]);
}
}
for (int j = 3; j < texts.Count; j++){
if (!System.Text.RegularExpressions.Regex.IsMatch(texts[j], @"^[a-zA-Zа-яА-Я ]+$")){
var newValue = texts[j].Replace(',', '.');
Console.WriteLine(newValue);
gread[z] = Convert.ToDouble(newValue);
z++;
}
}
addStudent(texts[1], Convert.ToInt32(texts[2]), gread);
i++;
}
//for (int j = 0; j < texts.Count; j++)
// {
// Console.WriteLine(texts[j]);
// }
}
The content of the file is this :
Name: as FacultyNumber: 4 Grades: 1,55 5,55 9,55 AverageGrade: 5
Name: asd FacultyNumber: 2 Grades: 1,23 4,56 7,89 AverageGrade: 4,56
Name: ad FacultyNumber: 3 Grades: 2,55 4,55 7,55 AverageGrade: 4,33
Name: ddd FacultyNumber: 1 Grades: 2,55 5,55 9,55 AverageGrade: 4
It's seemingly formatted correctly but I don't know why it crashes? I checked for extra spaces but there aren't.
c# file-io console-application
edited Nov 23 '18 at 16:41
kit
1,1063716
asked Nov 23 '18 at 14:47
Gopnik McSlav Mangal Minja
327
add a comment |
0
I am reading a string from file and I try to convert it to double, but it says:
1.55
Unhandled Exception: System.FormatException: Input string was not in a
correct format. at System.Number.ParseDouble(String value,
NumberStyles options, NumberFormatInfo numfmt) at
System.Convert.ToDouble(String value) at ConsoleApp6.Logic.read()
in C:UserssashkSourceReposConsoleApp6ConsoleApp6Class2.cs:line
123 at ConsoleApp6.Program.Main(String args) in
C:UserssashkSourceReposConsoleApp6ConsoleApp6Program.cs:line 19
It prints the first grade but it blocks on the second double, I don't know the reason why. Here is the code:
public void read(){
string textes = File.ReadAllLines(@"C:UserssashkSourceReposConsoleApp6ConsoleApp6save.txt", Encoding.Default);
double gread = new double[40];
var excluded = new { "Name:", "FacultyNumber:", "Grades:", "AverageGrade:" };
var dot = "," ;
List<string> texts = new List<string>();
int i = 0;
int z = 0;
foreach (string text in textes){
string words = textes[i].Split(' ');
for (int j = 0; j < words.Length; j++){
if (!excluded.Contains(words[j])){
texts.Add(words[j]);
// Console.WriteLine(words[j]);
}
}
for (int j = 3; j < texts.Count; j++){
if (!System.Text.RegularExpressions.Regex.IsMatch(texts[j], @"^[a-zA-Zа-яА-Я ]+$")){
var newValue = texts[j].Replace(',', '.');
Console.WriteLine(newValue);
gread[z] = Convert.ToDouble(newValue);
z++;
}
}
addStudent(texts[1], Convert.ToInt32(texts[2]), gread);
i++;
}
//for (int j = 0; j < texts.Count; j++)
// {
// Console.WriteLine(texts[j]);
// }
}
The content of the file is this :
Name: as FacultyNumber: 4 Grades: 1,55 5,55 9,55 AverageGrade: 5
Name: asd FacultyNumber: 2 Grades: 1,23 4,56 7,89 AverageGrade: 4,56
Name: ad FacultyNumber: 3 Grades: 2,55 4,55 7,55 AverageGrade: 4,33
Name: ddd FacultyNumber: 1 Grades: 2,55 5,55 9,55 AverageGrade: 4
It's seemingly formatted correctly but I don't know why it crashes? I checked for extra spaces but there aren't.
c# file-io console-application
edited Nov 23 '18 at 16:41
kit
1,1063716
asked Nov 23 '18 at 14:47
Gopnik McSlav Mangal Minja
327
You should debug your app. In debug mode, it will stop when the exception is thrown. Then it's easy to see where and with which input data it fails.
– Christoph Lütjen
Nov 23 '18 at 15:01
your question is different from your code
– preciousbetine
Nov 23 '18 at 15:07
no it doesn't for (int j = 3; j < texts.Count; j++){ if (!System.Text.RegularExpressions.Regex.IsMatch(texts[j], @"^[a-zA-Zа-яА-Я ]+$")){ var newValue = texts[j].Replace(',', '.'); Console.WriteLine(newValue); gread[z] = Convert.ToDouble(newValue); z++; } } converts to the string to double and puts it in array called grades which is later assigned to the student?
– Gopnik McSlav Mangal Minja
Nov 23 '18 at 16:42
ChangeConsole.WriteLine(newValue);toConsole.WriteLine($"'{newValue}'");and your issue will be more obvious... Also, without wanting to give the game away, tryConsole.WriteLine(System.Text.RegularExpressions.Regex.IsMatch("", @"^[a-zA-Zа-яА-Я ]+$"));
– JohnLBevan
Nov 23 '18 at 16:56
1
… and you may want to check if your test "if string contains other characters than a-z it must be a double" is ideal. After this you could use double.TryParse that allows you to easily log errors.
– Christoph Lütjen
Nov 23 '18 at 17:05
add a comment |
0
0
0
I am reading a string from file and I try to convert it to double, but it says:
1.55
Unhandled Exception: System.FormatException: Input string was not in a
correct format. at System.Number.ParseDouble(String value,
NumberStyles options, NumberFormatInfo numfmt) at
System.Convert.ToDouble(String value) at ConsoleApp6.Logic.read()
in C:UserssashkSourceReposConsoleApp6ConsoleApp6Class2.cs:line
123 at ConsoleApp6.Program.Main(String args) in
C:UserssashkSourceReposConsoleApp6ConsoleApp6Program.cs:line 19
It prints the first grade but it blocks on the second double, I don't know the reason why. Here is the code:
public void read(){
string textes = File.ReadAllLines(@"C:UserssashkSourceReposConsoleApp6ConsoleApp6save.txt", Encoding.Default);
double gread = new double[40];
var excluded = new { "Name:", "FacultyNumber:", "Grades:", "AverageGrade:" };
var dot = "," ;
List<string> texts = new List<string>();
int i = 0;
int z = 0;
foreach (string text in textes){
string words = textes[i].Split(' ');
for (int j = 0; j < words.Length; j++){
if (!excluded.Contains(words[j])){
texts.Add(words[j]);
// Console.WriteLine(words[j]);
}
}
for (int j = 3; j < texts.Count; j++){
if (!System.Text.RegularExpressions.Regex.IsMatch(texts[j], @"^[a-zA-Zа-яА-Я ]+$")){
var newValue = texts[j].Replace(',', '.');
Console.WriteLine(newValue);
gread[z] = Convert.ToDouble(newValue);
z++;
}
}
addStudent(texts[1], Convert.ToInt32(texts[2]), gread);
i++;
}
//for (int j = 0; j < texts.Count; j++)
// {
// Console.WriteLine(texts[j]);
// }
}
The content of the file is this :
Name: as FacultyNumber: 4 Grades: 1,55 5,55 9,55 AverageGrade: 5
Name: asd FacultyNumber: 2 Grades: 1,23 4,56 7,89 AverageGrade: 4,56
Name: ad FacultyNumber: 3 Grades: 2,55 4,55 7,55 AverageGrade: 4,33
Name: ddd FacultyNumber: 1 Grades: 2,55 5,55 9,55 AverageGrade: 4
It's seemingly formatted correctly but I don't know why it crashes? I checked for extra spaces but there aren't.
c# file-io console-application
edited Nov 23 '18 at 16:41
kit
1,1063716
asked Nov 23 '18 at 14:47
Gopnik McSlav Mangal Minja
327
I am reading a string from file and I try to convert it to double, but it says:
1.55
Unhandled Exception: System.FormatException: Input string was not in a
correct format. at System.Number.ParseDouble(String value,
NumberStyles options, NumberFormatInfo numfmt) at
System.Convert.ToDouble(String value) at ConsoleApp6.Logic.read()
in C:UserssashkSourceReposConsoleApp6ConsoleApp6Class2.cs:line
123 at ConsoleApp6.Program.Main(String args) in
C:UserssashkSourceReposConsoleApp6ConsoleApp6Program.cs:line 19
It prints the first grade but it blocks on the second double, I don't know the reason why. Here is the code:
public void read(){
string textes = File.ReadAllLines(@"C:UserssashkSourceReposConsoleApp6ConsoleApp6save.txt", Encoding.Default);
double gread = new double[40];
var excluded = new { "Name:", "FacultyNumber:", "Grades:", "AverageGrade:" };
var dot = "," ;
List<string> texts = new List<string>();
int i = 0;
int z = 0;
foreach (string text in textes){
string words = textes[i].Split(' ');
for (int j = 0; j < words.Length; j++){
if (!excluded.Contains(words[j])){
texts.Add(words[j]);
// Console.WriteLine(words[j]);
}
}
for (int j = 3; j < texts.Count; j++){
if (!System.Text.RegularExpressions.Regex.IsMatch(texts[j], @"^[a-zA-Zа-яА-Я ]+$")){
var newValue = texts[j].Replace(',', '.');
Console.WriteLine(newValue);
gread[z] = Convert.ToDouble(newValue);
z++;
}
}
addStudent(texts[1], Convert.ToInt32(texts[2]), gread);
i++;
}
//for (int j = 0; j < texts.Count; j++)
// {
// Console.WriteLine(texts[j]);
// }
}
The content of the file is this :
Name: as FacultyNumber: 4 Grades: 1,55 5,55 9,55 AverageGrade: 5
Name: asd FacultyNumber: 2 Grades: 1,23 4,56 7,89 AverageGrade: 4,56
Name: ad FacultyNumber: 3 Grades: 2,55 4,55 7,55 AverageGrade: 4,33
Name: ddd FacultyNumber: 1 Grades: 2,55 5,55 9,55 AverageGrade: 4
It's seemingly formatted correctly but I don't know why it crashes? I checked for extra spaces but there aren't.
c# file-io console-application
c# file-io console-application
edited Nov 23 '18 at 16:41
kit
1,1063716
asked Nov 23 '18 at 14:47
Gopnik McSlav Mangal Minja
327
edited Nov 23 '18 at 16:41
kit
1,1063716
asked Nov 23 '18 at 14:47
Gopnik McSlav Mangal Minja
327
edited Nov 23 '18 at 16:41
kit
1,1063716
edited Nov 23 '18 at 16:41
kit
1,1063716
edited Nov 23 '18 at 16:41
kit
1,1063716
1,1063716
asked Nov 23 '18 at 14:47
Gopnik McSlav Mangal Minja
327
asked Nov 23 '18 at 14:47
Gopnik McSlav Mangal Minja
327
asked Nov 23 '18 at 14:47
Gopnik McSlav Mangal Minja
327
327
You should debug your app. In debug mode, it will stop when the exception is thrown. Then it's easy to see where and with which input data it fails.
– Christoph Lütjen
Nov 23 '18 at 15:01
your question is different from your code
– preciousbetine
Nov 23 '18 at 15:07
no it doesn't for (int j = 3; j < texts.Count; j++){ if (!System.Text.RegularExpressions.Regex.IsMatch(texts[j], @"^[a-zA-Zа-яА-Я ]+$")){ var newValue = texts[j].Replace(',', '.'); Console.WriteLine(newValue); gread[z] = Convert.ToDouble(newValue); z++; } } converts to the string to double and puts it in array called grades which is later assigned to the student?
– Gopnik McSlav Mangal Minja
Nov 23 '18 at 16:42
ChangeConsole.WriteLine(newValue);toConsole.WriteLine($"'{newValue}'");and your issue will be more obvious... Also, without wanting to give the game away, tryConsole.WriteLine(System.Text.RegularExpressions.Regex.IsMatch("", @"^[a-zA-Zа-яА-Я ]+$"));
– JohnLBevan
Nov 23 '18 at 16:56
1
… and you may want to check if your test "if string contains other characters than a-z it must be a double" is ideal. After this you could use double.TryParse that allows you to easily log errors.
– Christoph Lütjen
Nov 23 '18 at 17:05
add a comment |
You should debug your app. In debug mode, it will stop when the exception is thrown. Then it's easy to see where and with which input data it fails.
– Christoph Lütjen
Nov 23 '18 at 15:01
your question is different from your code
– preciousbetine
Nov 23 '18 at 15:07
no it doesn't for (int j = 3; j < texts.Count; j++){ if (!System.Text.RegularExpressions.Regex.IsMatch(texts[j], @"^[a-zA-Zа-яА-Я ]+$")){ var newValue = texts[j].Replace(',', '.'); Console.WriteLine(newValue); gread[z] = Convert.ToDouble(newValue); z++; } } converts to the string to double and puts it in array called grades which is later assigned to the student?
– Gopnik McSlav Mangal Minja
Nov 23 '18 at 16:42
ChangeConsole.WriteLine(newValue);toConsole.WriteLine($"'{newValue}'");and your issue will be more obvious... Also, without wanting to give the game away, tryConsole.WriteLine(System.Text.RegularExpressions.Regex.IsMatch("", @"^[a-zA-Zа-яА-Я ]+$"));
– JohnLBevan
Nov 23 '18 at 16:56
1
… and you may want to check if your test "if string contains other characters than a-z it must be a double" is ideal. After this you could use double.TryParse that allows you to easily log errors.
– Christoph Lütjen
Nov 23 '18 at 17:05
You should debug your app. In debug mode, it will stop when the exception is thrown. Then it's easy to see where and with which input data it fails.
– Christoph Lütjen
Nov 23 '18 at 15:01
You should debug your app. In debug mode, it will stop when the exception is thrown. Then it's easy to see where and with which input data it fails.
– Christoph Lütjen
Nov 23 '18 at 15:01
your question is different from your code
– preciousbetine
Nov 23 '18 at 15:07
your question is different from your code
– preciousbetine
Nov 23 '18 at 15:07
no it doesn't for (int j = 3; j < texts.Count; j++){ if (!System.Text.RegularExpressions.Regex.IsMatch(texts[j], @"^[a-zA-Zа-яА-Я ]+$")){ var newValue = texts[j].Replace(',', '.'); Console.WriteLine(newValue); gread[z] = Convert.ToDouble(newValue); z++; } } converts to the string to double and puts it in array called grades which is later assigned to the student?
– Gopnik McSlav Mangal Minja
Nov 23 '18 at 16:42
no it doesn't for (int j = 3; j < texts.Count; j++){ if (!System.Text.RegularExpressions.Regex.IsMatch(texts[j], @"^[a-zA-Zа-яА-Я ]+$")){ var newValue = texts[j].Replace(',', '.'); Console.WriteLine(newValue); gread[z] = Convert.ToDouble(newValue); z++; } } converts to the string to double and puts it in array called grades which is later assigned to the student?
– Gopnik McSlav Mangal Minja
Nov 23 '18 at 16:42
Change
Console.WriteLine(newValue); to Console.WriteLine($"'{newValue}'"); and your issue will be more obvious... Also, without wanting to give the game away, try Console.WriteLine(System.Text.RegularExpressions.Regex.IsMatch("", @"^[a-zA-Zа-яА-Я ]+$"));– JohnLBevan
Nov 23 '18 at 16:56
Change
Console.WriteLine(newValue); to Console.WriteLine($"'{newValue}'"); and your issue will be more obvious... Also, without wanting to give the game away, try Console.WriteLine(System.Text.RegularExpressions.Regex.IsMatch("", @"^[a-zA-Zа-яА-Я ]+$"));– JohnLBevan
Nov 23 '18 at 16:56
1
1
… and you may want to check if your test "if string contains other characters than a-z it must be a double" is ideal. After this you could use double.TryParse that allows you to easily log errors.
– Christoph Lütjen
Nov 23 '18 at 17:05
… and you may want to check if your test "if string contains other characters than a-z it must be a double" is ideal. After this you could use double.TryParse that allows you to easily log errors.
– Christoph Lütjen
Nov 23 '18 at 17:05
add a comment |
0
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You should debug your app. In debug mode, it will stop when the exception is thrown. Then it's easy to see where and with which input data it fails.
– Christoph Lütjen
Nov 23 '18 at 15:01
your question is different from your code
– preciousbetine
Nov 23 '18 at 15:07
no it doesn't for (int j = 3; j < texts.Count; j++){ if (!System.Text.RegularExpressions.Regex.IsMatch(texts[j], @"^[a-zA-Zа-яА-Я ]+$")){ var newValue = texts[j].Replace(',', '.'); Console.WriteLine(newValue); gread[z] = Convert.ToDouble(newValue); z++; } } converts to the string to double and puts it in array called grades which is later assigned to the student?
– Gopnik McSlav Mangal Minja
Nov 23 '18 at 16:42
Change
Console.WriteLine(newValue);toConsole.WriteLine($"'{newValue}'");and your issue will be more obvious... Also, without wanting to give the game away, tryConsole.WriteLine(System.Text.RegularExpressions.Regex.IsMatch("", @"^[a-zA-Zа-яА-Я ]+$"));– JohnLBevan
Nov 23 '18 at 16:56
1
… and you may want to check if your test "if string contains other characters than a-z it must be a double" is ideal. After this you could use double.TryParse that allows you to easily log errors.
– Christoph Lütjen
Nov 23 '18 at 17:05