There is no argument given that corresponds to the required formal parameter - NET Error

Question

I have been re-factoring one of my old MSSQL Connection helper library and I got the following error      Severity  Code    Description Project File    Line Error  CS7036  There is no   argument given that corresponds to the required formal parameter    errorMsg  of  ErrorEventArg ErrorEventArg string    string    MSSQLTest   C  Users Administrator Desktop MSSQLTest MSSQLTest MSSQLConnection cs   61   This is my code so far   MSSQLConnection cs  using System  using System Collections Generic  using System Data SqlClient  using System Threading   namespace MSSQLTest       public class ErrorEventArg   EventArgs               public string ErrorMsg   get  set            public string LastQuery   get  set             public ErrorEventArg string errorMsg  string lastQuery                        ErrorMsg   errorMsg              LastQuery   lastQuery                       public class MSSQLConnection                    lt summary gt              Private class objects               lt  summary gt          private SqlConnection sqlConnection          private int sqlCommandTimeout          private string lastQuery   string Empty                lt summary gt              Public event related objects  amp  handler               lt  summary gt          public event ErrorHandler OnError          public delegate void ErrorHandler MSSQLConnection sender  ErrorEventArg e                 lt summary gt              Class constructor               lt  summary gt               lt param name  sqlConnection  gt  lt  param gt               lt param name  sqlCommandTimeout  gt  lt  param gt          public MSSQLConnection SqlConnection sqlConnection  Int32 sqlCommandTimeout   120                        if  null    sqlConnection                  throw new Exception  Invalid MSSQL Database Conection Handle                 if  sqlConnection State    System Data ConnectionState Open                  throw new Exception  MSSQL Database Connection Is Not Open                 this sqlConnection   sqlConnection              this sqlCommandTimeout   sqlCommandTimeout                          lt summary gt              Helper method to emit a database error to event subscribers               lt  summary gt               lt param name  errorMsg  gt  lt  param gt          internal void EmitError String errorMsg                        var errorDelegate   OnError              if  errorDelegate    null                                errorDelegate this  new ErrorEventArg      Line  61                                       ErrorMsg   errorMsg                      LastQuery   lastQuery                                                          rest of the code snipped           What does this error means  amp  how do I fix it  I ve not seen this error before

User · Accepted Answer

You have a constructor which takes 2 parameters. You should write something like:

new ErrorEventArg(errorMsv, lastQuery)

It's less code and easier to read.

EDIT

Or, in order for your way to work, you can try writing a default constructor for ErrorEventArg which would have no parameters, like this:

public ErrorEventArg() {}

User · Answer

In the constructor of    public class ErrorEventArg   EventArgs   You have to add  base  as follows       public ErrorEventArg string errorMsg  string lastQuery    base  string errorMsg  string lastQuery                ErrorMsg   errorMsg          LastQuery   lastQuery          That solved it for me

User · Answer

I received this same error in the following Linq statement regarding DailyReport   The problem was that DailyReport had no default constructor   Apparently  it instantiates the object before populating the properties   var sums   reports      GroupBy r   gt  r CountryRegion       Select cr   gt  new DailyReport               CountryRegion   cr Key          ProvinceState    All           RecordDate   cr First   RecordDate          Confirmed   cr Sum c   gt  c Confirmed           Recovered   cr Sum c   gt  c Recovered           Deaths   cr Sum c   gt  c Deaths

User · Answer

I got this error when one of my properties that was required for the constructor was not public   Make sure all the parameters in the constructor go to properties that are public if this is the case   using statements namespace someNamespace  public class ExampleClass        Properties - one is not visible to the class calling the constructor   public string Property1   get  set      string Property2   get  set          Constructor    public ExampleClass string property1  string property2           this Property1   property1       this Property2   property2     this caused that error for me

User · Answer

I got the same error but it was due to me not creating a default constructor   If you haven t already tried that  create the default constructor like this   public TestClass

[c#] There is no argument given that corresponds to the required formal parameter - .NET Error

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