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well I have this code:
XDocument doc = XDocument.Load(@"C:\Work\stores.xml");
var xpath = "//store/Color[text()=]" + X;
var result = ((IEnumerable)doc.XPathEvaluate(xpath)).Cast<XElement>().FirstOrDefault();
textBox1.Text = result.Value;
and it worked fine
when I want to pass a variable it gives the error: " System.Xml.XPath.XPathException: the expression must be aviliated.." in this line "var result = ((IEnumerable)doc.XPathEvaluate(xpath)).Cast<xelement>().FirstOrDefault();"
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devilonline1 wrote: the expression must be aviliated
That's not the correct error message. Did you mean:
"Expression must evaluate to a node-set"
That still means that your XPath query is invalid.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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I'm not sure if this will help you, but I know how you feel regarding querying XML... It has plagued me for about a week now. I just came up with this code yesterday, it searches, copies and saves XML:
private static object GetSetting(string source, string setting)
{
XmlDocument xdoc = new XmlDocument();
xdoc.Load(source);
return xdoc.SelectSingleNode("/Settings/" + setting).InnerText;
}
private static void AdjustSetting(string source, string setting, string value)
{
XmlDocument xdoc = new XmlDocument();
xdoc.Load(source);
xdoc.SelectSingleNode("/Settings/" + setting).InnerText = value);
xdoc.Save(source);
}
And here is the XML:
="1.0"="utf-8"
<Settings>
<Exit>true</Exit>
</Settings>
finally, here is the code I'm using this on:
AdjustSetting(Xmlpath, "Exit", "false");
while (GetSetting(XmlPath, "Exit").ToString() != "true")
{
ProcessInput(Console.ReadLine());
}
If you need me to explain any of this please feel free to ask. I hope it helps..
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i am getting below error
System.Web.Services.Protocols.SoapException: Format of the initialization string does not conform to specification starting at index 97.
below is my connection string
<property name="connection.connection_string">"Provider=SSISOLEDB.3;Data Source=***;User ID=***;DB=**;PWD=**;"
i am using nhibernet
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See my linq query first
var query = (from r1 in dtMappedSectionNotEmpty.AsEnumerable()
join r2 in dtData.AsEnumerable()
on r1.Field<string>("Row").Trim().ToUpper() equals r2.Field<string>("RowCoordinate").Trim().ToUpper()
join r3 in _Periods.AsEnumerable()
on r2.Field<string>("StandardDate").Replace("A", string.Empty).Replace("E", string.Empty).Trim().ToUpper() equals r3.Replace("A", string.Empty).Replace("E", string.Empty).Trim().ToUpper()
where r1.Field<string>("Tab").Trim().ToUpper() == strTab.Trim().ToUpper()
select new BrokerData
{
RowNumber = r1.Field<string>("Row") ?? "0",
TabName = r1.Field<string>("Matched Section") ?? "",
StandardDate = r3.ToString(),
BRTab = r1.Field<string>("Tab") ?? "",
BRLineItem = r1.Field<string>("Broker Items") ?? "",
Action = r1.Field<string>("Action") ?? "",
StandardLineItem = r1.Field<string>("Matched Items") ?? "",
StandardValue =r2.Field<string>("LineItemDateValue") ?? ""
}).ToList();
in my above code there are 2 datatable and one list. now i am not being able to compose left and inner join in same query.
there will be left join between dtMappedSectionNotEmpty and dtData datatable. means left join between r1 & r2
again there will be inner join between dtData & _Periods means i want inner join between r2 & r3
so please see my code and give me another set same LINQ code where left join and inner join will be there in same query. thanks
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Use "intermediate" queries. LINQ will do the same internally. There is nothing special or heroic in doing it in the "same query".
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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i know i can break the query into two separate to achieve this job but i need to know if i want to do left & inner join in same query then how could i compose it. i stuck for syntax. if you know then post a sample LINQ query where left & inner join will be performed in same query. thanks
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we are developers and our winform project is in VSTS. our product is in-house product means our product users are also from our company employees. we use click once publish option to give update to our users. when we publish our product changes by client once deployment then it is publish to global folder from where all user get their update.
i have no idea how CI/CD works and also i do not know does it fit for our winform project?
nowadays many company uses CI/CD. does it only applicable for web application or CI/CD can be used for winform project too ?
please guide me how could i use CI/CD for our winform project to distribute update to our in-house client ?
please tell me by azure CI/CD how can i push publish to my winform project from VSTS to folder of my pc ?
i will be glad if anyone give answer. thanks
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This forum is for specific questions regarding C# code. There is not space to answer your questions, which are too broad for a technical forum. See CI/CD - Google Search[^], which is where you should find the answers.
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Por favor me ajude a resolver este problema amigos, ja tentei e não consigo.
using System;
using System.Globalization;
namespace _1002
{
class Program
{
static void Main(string[] args)
{
double R = Convert.ToDouble(Console.ReadLine());
double A = Math.PI * Math.Pow(R, R);
Console.WriteLine("A = " +A.ToString("F4",CultureInfo.InvariantCulture));
}
}
}
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You can't "solve" an input string format problem: it says what it means: the user typed a value that cannot be interpreted as a valid double
You can prevent your app from crashing though:
double R;
while (true)
{
Console.Write("Please enter the radius of the circle :");
string input = Console.ReadLine();
if (double.TryParse(input, out R))
{
break;
}
Console.WriteLine($"\"{input}\" is not a valid number.");
}
double A = Math.PI * Math.Pow(R, R);
Console.WriteLine("A = ", A.ToString("F4",CultureInfo.InvariantCulture));
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
AntiTwitter: @DalekDave is now a follower!
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OriginalGriff wrote: You can't "solve" an input string format problem: it says what it means: the user typed a value that cannot be interpreted as a valid double
This could be a culture issue. In many languages, the decimal point is a decimal comma; the point is used as the thousands separator.
The simple form of TryParse (or Convert.ToDouble) use the "Digit grouping symbol" and "Decimal symbol" specified in the regional settings. I am not familiar with Spanish conventions (and maybe in varies among Spanish speaking countries): If the local convention is to uses comma as a decimal symbol, but the regional settings have not been set properly to reflect this entering e.g. 1.234.567,89 will cause a format error.
Alternately, if regional settings are set to the local culture, but the user is accustomed to having to follow English conventions when working with computers, and enters 1,234,567.89, it will fail as well.
ToDouble and TryParse have overloads allowing the specification of a format, so that you can override the regional setting. If you want to accept either, you must scan the string: If both comma and point appears in the string, whichever appears first is likely to be the digit grouping symbol, not a decimal symbol. If only one of them appears, but multiple times, it is likely to be a digit grouping symbol.
If only one of them apppears, once, the format is ambiguous. You might guess that if the number of digits following the symbol is anything but 3, it is a decimal symbol. Or the context may indicate which is the most probable interpretation - usually, one value is more likely than thousand times larger or smaller. Or, if you in the same application activation have had other numbers input, containing both comma and point, you may assume that the same numeric format is used, in ambiguous cases.
Once you have determined the proper comma/point interpretation, you can call the TryParse function with the proper format indicator.
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I made from a database get and created in HDD. But how to read by axAcroPDF1.src (Adobe Reader)
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If it is on-disc, than you can simply launch the document as if it is an executable; the application associated with its extension would be used to open it.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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i'm new to C# and i'm just doin a test proj... i wonder why this happened?
using System;
namespace test_cs
{
class Program
{
static double calc(double n, double m)
{
return (n * m);
}
static void Main(string[] args)
{
Console.WriteLine("Welcome to calculator 1.0");
Console.Write("Enter calculations:");
double num1, num2;
char oper;
num1 = Convert.ToInt32(Console.Read());
oper = Convert.ToChar(Console.Read());
num2 = Convert.ToInt32(Console.Read());
Console.WriteLine("{0} {1} {2}", num1, oper, num2);
Console.ReadLine();
Console.ReadLine();
}
}
}
the result is:
Imgur: The magic of the Internet[^]
anybody can explain why?
also, i actually wanna make input streaming like C++
std::cin >> num1 >> oper >> num2;
but haven't know how to do it in C#
modified 14-Feb-20 12:25pm.
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Simple: COnsole.Read fetches a single character from eth input types by the user, and you are converting that to an integer - but Convert changes type, not value. The character '3' is not the same a a number 3 - it's a character with a particular value within a character set, which is actually 51 in decimal: http://www.asciitable.com/
What I'd suggest is you read it as a line:
string input = Console.ReadLine(); And then "break" that into separate token strings:
Match m = Regex.Match(input, @"^(\d+)([^\d])(\d+)$");
if (m.Success)
{
int a = int.Parse(m.Groups[1].Value);
string op = m.Groups[2].Value;
int b = int.Parse(m.Groups[3].Value);
Console.WriteLine($"{a} {op} {b}");
}
This also means that it will work if you enter 123+456
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
AntiTwitter: @DalekDave is now a follower!
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is there any simpler ways like C++?
i can typed 9+3 and make input stream like this:
int num1, num2;
char opr;
std::cin >> num1 >> opr >> num2;
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No. Using the Console to interface with the user is "old fashioned" and you won't be doing it for long anyway.
C# was born into a Windows world, and was primarily designed to work in Windows apps. C++ was the child of C, and was born into a world where Windows was new and unpopular, so it was given much more text based user input focus, because it needed it way back then.
In the modern world, even C++ apps very rarely use cin at all now!
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
AntiTwitter: @DalekDave is now a follower!
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51 is "3" in the ASCII table, 52 is "4".
Console.Read reads a character and returns its ASCII value as an integer.
Returns Int32
The next character from the input stream, or negative one (-1) if there are currently no more characters to be read.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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<pre lang="c#"> plese help me solve this problem i am trying to make a auto fill button by using 3 layer architecture in asp.net c# on windows form
<pre>BELayer:
public string quantity { get; set; }
public string prod_id { get; set; }
public string party_id { get; set; }
DALayer page code:
public SqlDataReader autofillparty_id(BEL beobj)
{
try
{
cmd = new SqlCommand("select * from product where prod_id='" + beobj.prod_id + "'", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "spsearchpartyid";
cmd.Parameters.AddWithValue("@prod_id", beobj.prod_id);
con.Open();
SqlDataReader sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return sdr;
}
catch (Exception ex)
{
throw ex;
}
finally
{
con.Close();
}
}
BALayer code
public SqlDataReader autofillquantity(BEL beobj)
{
try
{
return daobj.autofillparty_id(beobj);
}
catch (Exception ex)
{
throw ex;
}
}
Main Page code::
private void button1_Click(object sender, EventArgs e)
{
if (baobj.autofillquantity(beobj).Read())
{
txtboxpartyidquant.Text = (beobj.party_id.ToString());
}
}
this code is not working i know problem is in my main page but i don't know how can i solve this problem please help me ...
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Look, it really doesn't matter where you post this: as long as you are not listening to us, you will still be vulnerable to sQL injection.
So I'll say it for the third time in two days:
Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Always use Parameterized queries instead.
When you concatenate strings, you cause problems because SQL receives commands like:
SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood' The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:
SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable; Which SQL sees as three separate commands:
SELECT * FROM MyTable WHERE StreetAddress = 'x'; A perfectly valid SELECT
DROP TABLE MyTable; A perfectly valid "delete the table" command
And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.
So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?
If you don't listen to what we tell you, there really isn't any point in talking to you ...
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
AntiTwitter: @DalekDave is now a follower!
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Hi,
What is the correct way to do Business Validation on entities with Entity Framework 6. By business Validation I mean validation that require more than one entity in process with, sometime, a little more complex rules that involve all these entities. A validation that require the system to call he database.
I already checked this post:
ScottGu's Blog - Class-Level Model Validation with EF Code First and ASP.NET MVC 3
But, like most example about EF and validation all validations are limited to simple check that consider only the current entity. I need to do some check based on other entities.
Example: I have a order entity that contain a quantity of product but this quantity must be a multiple of a variable stored in my item entity. This is what I call the business validation. To perform this validation on order I need to go in database and check the item selected for this order.
public class Order : IValidateObject
{
public int Id { get; set; }
public int ItemId { get; set; }
public int Quantity { get; set; }
public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
{
var item = DbContext.Items.Find(ItemId);
if (Quantity % item.Multiple != 0)
yield return new ValidationResult("Quantity not multiple of item", new[] {Quantity});
}
}
public class Item
{
public int Id { get; set; }
public int Multiple { get; set; }
}
How should I implement this kind of business validation that require other entities? I'm more looking for a good tutorial about this subject. I search but each time I think I find the subject the tutorial is limited to classic validation with Data Annotation or other type of classic validation.
Maybe you will juste tell me there is no problem to class my context in the Validate method. It is just that most of tutorial separate the entity layer from the context layer suggesting entities must only be simple POCO with no behavior. I most and most disagree with this but I feel alone.
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The "Enumerable" makes no sense. "Validation" is an all or nothing proposition. If you want to return multiple error / messages, return a list. If the list is "empty", you might consider things valid and then do a "save".
Other than that, you've provide no information about the environment: online, batch, whatever.
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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