Erreur de conversion type de données nvarchar flotter

Question

Voici le code:

protected void Button11_Click(object sender, EventArgs e) 
    { 
      String usr = Membership.GetUser(false).ToString(); 
      int x, count = 0, avail_shares,num; 
      float t_c, c_p, c_t,ret,com,t_r,pr; 
      String comp = this.DropDownList4.SelectedValue.ToString(); 

      avail_shares = Convert.ToInt32(this.TextBox10.Text); 
      pr = float.Parse(this.TextBox15.Text); 
      t_c = float.Parse(this.TextBox14.Text); 
      c_p = float.Parse(this.TextBox12.Text); 
      c_t = float.Parse(this.TextBox131.Text); 
      ret = float.Parse(this.TextBox132.Text); 
      com = float.Parse(this.TextBox133.Text); 
      t_r = float.Parse(this.TextBox13.Text); 
      num = Convert.ToInt32(this.TextBox11.Text); 

      if (num > avail_shares) 
      { 
       this.Label23.Text = "You cannot sell more number of shares than what you actuall have"; 
      } 
      else 
      { 
       DbProviderFactory dbproviderfactory = DbProviderFactories.GetFactory("System.Data.SqlClient"); 
       using (DbConnection conn = dbproviderfactory.CreateConnection()) 
       { 
        string s = ConfigurationManager.ConnectionStrings["Project_FinanceConnectionString"].ConnectionString; 

        conn.ConnectionString = s; 

        conn.Open(); 


        DbCommand cmd = conn.CreateCommand(); 
        //DbCommand cmd1 = conn.CreateCommand(); 

        cmd.CommandText = "INSERT INTO sell_activity(username,company,avail_units,old_price,total_old_price,new_price,total_new_price,number,ret,commission,total_return,timestamp)VALUES(@U,@C,@A_U,@O_P,@T_O_P,@N_P,@T_N_P,@N,@R,@C,@T_R,@T)"; 

        //cmd1.CommandText = "SELECT EventID from EventsTable where EventName = ename";      


        SqlParameter U = new SqlParameter("@U", SqlDbType.NVarChar, 256); 
        SqlParameter C = new SqlParameter("@C", SqlDbType.NVarChar, 50); 
        SqlParameter A_U = new SqlParameter("@A_U", SqlDbType.Int); 
        SqlParameter O_P = new SqlParameter("@O_P", SqlDbType.Float); 
        SqlParameter T_O_P = new SqlParameter("@T_O_P", SqlDbType.Float); 
        SqlParameter N_P = new SqlParameter("@N_P", SqlDbType.Float); 
        SqlParameter T_N_P = new SqlParameter("@T_N_P", SqlDbType.Float); 
        SqlParameter N = new SqlParameter("@N", SqlDbType.Int); 
        SqlParameter R = new SqlParameter("@R", SqlDbType.Float); 
        SqlParameter Commi = new SqlParameter("@Commi", SqlDbType.Float); 
        SqlParameter T_R = new SqlParameter("@T_R", SqlDbType.Float); 
        SqlParameter T = new SqlParameter("@T", SqlDbType.DateTime); 


        U.Value = usr; 
        C.Value = comp; 
        A_U.Value = avail_shares; 
        O_P = pr; 
        T_O_P = t_c; 
        N_P=c_p; 
        T_N_P = c_t; 
        N = num; 
        R = ret; 
        Commi = com; 
        T_R = t_r; 
        T = DateTime.Now; 

        cmd.Parameters.Add(@U); 
        cmd.Parameters.Add(@C); 
        cmd.Parameters.Add(@A_U); 
        cmd.Parameters.Add(@O_P); 
        cmd.Parameters.Add(@T_O_P); 
        cmd.Parameters.Add(@N_P); 
        cmd.Parameters.Add(@T_N_P); 
        cmd.Parameters.Add(@N); 
        cmd.Parameters.Add(@R); 
        cmd.Parameters.Add(@Commi); 
        cmd.Parameters.Add(@T_R); 
        cmd.Parameters.Add(@T); 

        [b]DbDataReader reader = cmd.ExecuteReader();[/b] 
        try 
        { 
         if (reader.HasRows) 
         { 

          while (reader.Read()) 
          { 

          } 
         } 
        } 
        catch (Exception err) 
        { 
         Response.Write("Problem in retriving the latest values..Please try again."); 
         Response.Write(err); 
        } 
        reader.Close(); 
       } 

      } 
    } 

Après que j'essaie de tester la page, je reçois l'erreur suivante:

System.Data.SqlClient.SqlException: [b]Error converting data type nvarchar to float. [/b] at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlDataReader.ConsumeMetaData() at System.Data.SqlClient.SqlDataReader.get_MetaData() at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) at System.Data.Common.DbCommand.ExecuteReader() at portfolio.Button11_Click(Object sender, EventArgs e) in e:\Study\LAST SEM\Project\Backup\Finance1\portfolio.aspx.cs:line 1187

Tous les types d'idée ..

J'ai également essayé de déboguer utilisant la montre et chaque variable obtient la valeur qu'elle obtiendrait ... ainsi je ne comprends pas la cause du problème :( pl m'aider

Answer 1

La méthode ExecuteReader est généralement utilisée pour obtenir les résultats de requête (SELECT) en tant qu'objet DataReader. Mais je vois que vous essayez d'effectuer un insert. Je suggère d'utiliser SqlCommand.ExecuteNonQuery à la place et voir si cela fonctionne.

Plus remplacer exactement

DbDataReader reader = cmd.ExecuteReader(); 

if (reader.HasRows) 
{ 
    while (reader.Read()) 
    { 
    } 
} 

avec

cmd.ExecuteNonQuery(); 

Vérifiez également si l'un des SqlParameters que vous créez avec les cartes de type SqlDbType.NVarChar à une colonne de type float dans la base de données. Utilisez les types appropriés pour les paramètres SqlParameters.