i have a webmethod in my webservice
public class Service : System.Web.Services.WebService
{
[WebMethod]
public int ADD(int a,int b )
{
return a+b;
}
}
i need to implement it in a windowapplication which contain a textbox .i added webreference there with foldername "localhost" and URL as "http://localhost:4484/WebSite2/Service.asmx"
using WindowsApplication4.localhost;
localhost.Service s = new Service();
s.ADD(12,34);
textBox1.Text = s.ToString();
but i am getting result as "WindowsApplication4.localhost.Service" instead of "46"
Can any one tell me the reason for this
Shouldn't
s.ADD(12,34);
textBox1.Text = s.ToString();
be
textbox1.Text = s.ADD(12, 34).ToString(); ?
Related
I am working on a class Library with .NET Framework 4.0. I have managed to pull a row using ADO.NET, but I'm unable to read individual values. I want the end result in class object. I have tried reading individual value dbReader.GetValue(dbReader.GetOrdinal("BranchCode")) but getting empty result.
Branch class:
public class Branch
{
public Branch() { }
public int BranchId { get; set; }
public string BranchCode { get; set; }
public string BranchName { get; set; }
}
DataReader class:
public void Initialize()
{
try
{
string connectionString = "xyz";
SqlConnection dbConnection = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand("Select * from dbo.Branch", dbConnection);
dbConnection.Open();
SqlDataReader dbReader = cmd.ExecuteReader();
while (dbReader.Read())
{
var x1 = dbReader.GetValue(dbReader.GetOrdinal("BranchId"));
var x2 = dbReader.GetValue(dbReader.GetOrdinal("BranchCode"));
var x3 = dbReader.GetValue(dbReader.GetOrdinal("BranchName"));
}
var dd = "Dd";
}
catch(Exception ex)
{
throw ex;
}
}
You have a number of issues with your code.
You need to actually create the Branch objects and do something with them. For example, return List.
To read the values, the easiest way is to do (typeNameHere) dbReader["ColumnName"]
You should SELECT exactly the right columns not SELECT *
Don't catch then re-throw exceptions with throw ex; as it wipes the stakc trace.
public List<Branch> Initialize()
{
string connectionString = "xyz";
const string query = #"
Select
b.BranchId,
b.BranchCode,
b.BranchName
from dbo.Branch b;
";
using (SqlConnection dbConnection = new SqlConnection(connectionString))
using (SqlCommand cmd = new SqlCommand(query, dbConnection))
{
dbConnection.Open();
using (SqlDataReader dbReader = cmd.ExecuteReader())
{
var list = new List<Branch>();
while (dbReader.Read())
{
var b = new Branch();
b.BranchId = (int)dbReader["BranchId"];
b.BranchCode = (string)dbReader["BranchCode"];
b.BranchName = (string)dbReader["BranchName"];
list.Add(b);
}
return list;
}
}
}
I'm trying to do a simple thing: to get the MAX of a column. Is quite simple, you know, just run SELECT MAX(column) FROM table;
The problem is when I try to do this in my .NET Core 2.1 project, using Entity Framework.
I have a function that should return the next value of a column.
private int getColumNextValue(string table, string column)
{
string query = $"SELECT MAX({column}) + 1 FROM {table};";
return base.context.Database.ExecuteSqlCommand(query);
}
The query is being generated correclty:
However, it's returning -1 instead of the real value.
But when I run the exact same query in Sql Server Management Studio, the result is correct:
What's going on?
For ExecuteSqlCommand, it only return the number of rows affected. It would not run the query and return the result.
For a workaround, you could try like:
public class ApplicationDbContext : IdentityDbContext
{
public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
: base(options)
{
}
public DbSet<User> User { get; set; }
public async Task<T> ExecuteScalarAsync<T>(string rawSql, params object[] parameters)
{
var conn = Database.GetDbConnection();
using (var command = conn.CreateCommand())
{
command.CommandText = rawSql;
if (parameters != null)
foreach (var p in parameters)
command.Parameters.Add(p);
await conn.OpenAsync();
return (T)await command.ExecuteScalarAsync();
}
}
}
And use ExecuteScalarAsync like
public async Task<IActionResult> Index()
{
string query = $"SELECT MAX(SEQ) + 1 FROM [User];";
var result = await _context.ExecuteScalarAsync<int>(query);
return View();
}
I used QueryFirstOrDefault<int> to solve my problem.
I wrote this helper method for reusable purpose:
private int GetColumNextValue(string table, string column)
{
using (SqlConnection conn = new SqlConnection(this.configuration.GetConnectionString("MyConnection")))
{
string query = $"SELECT MAX({column}) + 1 FROM {table};";
return conn.QueryFirstOrDefault<int>(query);
}
}
I hope it can help other people.
My Api:
public ConnectionStringSettings product;
public DbConnection connection1;
public DbCommand cdm1;
public void conn1(string a)
{
product = ConfigurationManager.ConnectionStrings["addConnection"];
connection1 = new SqlConnection();
connection1.ConnectionString = product.ConnectionString;
cdm1 = connection1.CreateCommand();
cdm1.CommandType = CommandType.Text;
cdm1.CommandText = a;
connection1.Open();
}
[Route("api/JobApi/BrowseJobs/")]
[HttpGet]
public object BrowseJobs()
{
string f = "";
try
{
conn1(string.Format("select * from FreelancerLogin"));
//select karim from UserPictures where username= karim
f = cdm1.ExecuteScalar().ToString();
}
catch (Exception ex)
{
f = ex.Message.ToString();
}
return f;
}
it returns single value like 21. But i want to return all row like the image and in json format to use in angularjs. How can i do that? Is there any other way to get my desired result?
you should use SqlDataReader and ExecuteReader method not execute scalar (execut sacal are for update, delete or insert = query with not return except key or valid result) like it:
SqlDataReader reader = cdm1.ExecuteReader();
if (reader.HasRows)
{
while (reader.Read())
{
Console.WriteLine("{0}\t{1}", reader.GetInt32(0),
reader.GetString(1));
}
}
else
{
Console.WriteLine("No rows found.");
}
reader.Close();
I am not having any issues making calls from the form instance to the Revit class. It's when I try to assign a List to the Revit class's function categoryList(), that I get a variable doesn't exist in the context error. I tried prefixing a reference to the instance of the form class "Form UF = new Form;" This doesn't work.
//The Revit Class
public Result Execute(ExternalCommandData commandData, ref string message,....)
{
User_Form UF = new User_Form(commandData);
UF.ShowDialog();
public List<BuiltInCategory> categoryList(Document doc, int intSwitch)
{
//list built in categories for built in filter_1
builtInCats_List = new List<BuiltInCategory>();
switch (intSwitch)
{
case (1):
...
case (3):
...
case (4):
{
builtInCats_List = newStateCb1;
return builtInCats_List;
}
default:
{
builtInCats_List = newStateCb1;
return builtInCats_List;
}
}
}
using Form = System.Windows.Forms.Form;
using WS = ModelAuditor_2014.WorksetSorter_2014;
using ModelAuditor_2014;
using System.Threading;
//The Form
namespace ModelAuditor_2014
{
public partial class User_Form : Form
{
//Constructor
WorksetSorter_2014 WS = new WorksetSorter_2014();
//Revit references
public Autodesk.Revit.UI.UIApplication rvtUiApp;
public Autodesk.Revit.UI.UIDocument rvtUiDoc;
public Autodesk.Revit.ApplicationServices.Application rvtApp;
//Global Variables
public List<BuiltInCategory> Filter01_CategoryList;
public List<BuiltInCategory> Filter02_CategoryList;
public int intSwitch;
public List<BuiltInCategory> newStateCb1;
public User_Form(ExternalCommandData commandData)
{
//Revit references
rvtUiApp = commandData.Application;
rvtUiDoc = rvtUiApp.ActiveUIDocument;
rvtApp = rvtUiApp.Application;
InitializeComponent();
}
public void User_Form_Load(object sender, EventArgs e)
{
//use rvtDoc = Doc
Autodesk.Revit.DB.Document rvtDoc = .....
//CheckedListBox for filter01
checkedListBox1.DataSource = WS.categoryList(rvtDoc, intSwitch = 1);
Filter01_CategoryList = new List<BuiltInCategory>();
Filter01_CategoryList = WS.RetrieveSchema(rvtDoc, false);
foreach (BuiltInCategory ChkedB1 in Filter01_CategoryList)
{
for (int i = 0; i < checkedListBox1.Items.Count; i++)
{
if (checkedListBox1.Items[i].ToString() == ChkedB1.ToString())
{
checkedListBox1.SetItemChecked(i, true);
}
}
}
public List<BuiltInCategory> returnNewStateCB1()
{
newStateCb1 = checkedListBox1.CheckedItems.Cast
<BuiltInCategory>().ToList<BuiltInCategory>();
return newStateCb1;
}
I passed the list from the win form to another public function in the revit app, I was able to access the list returned by this function.
I am using generic data classes, so I can't use ria services attributes to control my validation - so I am looking for a way to manualy set up validation to work in a DataForm.
public partial class DataValue
{
private Dictionary<string, string> _errors = new Dictionary<string, string>();
public Dictionary<string, string> Errors
{
get { return _errors; }
}
public Object Value
{
get
{
object result = new object();
switch ((DataType)this.ModelEntity.ModelItem.DataType)
{
case DataType.Money:
return result = this.ValueText.ParseNullableFloat();
case DataType.Integer:
return result = this.ValueText.ParseNullableInt();
case DataType.Date:
case DataType.Time:
return result = this.ValueText.ParseNullableDateTime();
case DataType.CheckBox:
return result = this.ValueText;
default:
return result = this.ValueText;
}
}
set
{
if (!String.IsNullOrEmpty(value.ToString()))
{
bool invalid = false;
switch ((DataType)this.ModelEntity.ModelItem.DataType)
{
case DataType.Money:
float val;
if (!float.TryParse(value.ToString(), out val)) invalid = true;
break;
case DataType.Integer:
int val2;
if (!Int32.TryParse(value.ToString(), out val2)) invalid = true;
break;
case DataType.Date:
case DataType.Time:
DateTime val3;
if (!DateTime.TryParse(value.ToString(), out val3)) invalid = true;
break;
}
if (invalid == false)
ValueText = value.ToString();
else
{
ValueText = "";
_errors.Add(this.ModelEntity.LocalName, "error writing " + value.ToString() + " to " + this.ModelEntity.ModelItem.Label);
}
}
else
ValueText = "";
}
}
public partial class ModelValidater : INotifyPropertyChanging, INotifyPropertyChanged
{
private static PropertyChangingEventArgs emptyChangingEventArgs = new PropertyChangingEventArgs(String.Empty);
private int _ModelValidatorId;
private int _ModelEntityId;
private int _ValidatorType;
private string _ValidatorParameters;
So in ASP MVC, I simply manually checked against these rules when the form was submitted... which I guess is pretty much what I want to do in MVVM (I am just not sure the best way to go about this).
ASP Code
protected bool ModelErrors(RecordDictionary record)
{
bool result = false;
foreach (var field in record)
{
foreach (var error in field.Value.Errors)
{
result = true;
ModelState.AddModelError(error.Key + "Validation", error.Value.ToString());
}
}
return result;
}
Silverlight 3 built-in validation is based on exceptions.
Just throw a meaningful exception in your generic Setter and you should be fine.
Remember to set ValidatesOnException=True and NotifyOnValidationError=True on your {Binding}.
Jesse has a good sample of validation with exceptions on his blog.
You can attach the validation attributes using the MetadataTypeAttribute attribute.
RIA Services will automatically generate these validation on the client for you once they're exposed in the DomainService.
Example:
[MetadataType(typeof(ContactMd))]
public partial class Contact
{
internal class ContactMd
{
[MyCustomValidation]
public string Name { get; set; }
}
}
(MyCustomValidation refers to anything that inherits from ValidationAttribute).