how to replace APPEND in C# after translating code from VB to .Net

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Hello

Am tried to translate my VB code to C# and facing an error.

Below is my VB code....

VB

While rs.Read()
            this_key = keys(CStr(rs.Item("BillingCode")))

            If x(this_key) Mod 2 = 0 Then
                rows(this_key).Append("<tr>")
            Else
                rows(this_key).Append("<tr class=list_row_alt>")
            End If

            If rs.Item("amount") is DBNull.Value Then
                this_amount = 0
            Elseif this_key = "check" or this_key = "card" Then
                this_amount = -1 * rs.Item("amount")
            Else
                this_amount = rs.Item("amount")
            End If


            rows(this_key).Append("<td class=list_cell>" & rs.Item("date") & "</td>")
            rows(this_key).Append("<td class=list_cell><a href=""../../classroom_program/billing.aspx?ClassroomProgramID=" & rs.Item("ClassroomProgramID") & """>" & rs.Item("program_title") & "</a></td>")
            If rs.Item("SchoolID") <> 0 Then
                rows(this_key).Append("<td class=list_cell><a href=""../../school/default.aspx?SchoolID=" & rs.Item("SchoolID") & """>" & rs.Item("school_name") & "</a></td>")
            Else
                rows(this_key).Append("<td class=list_cell>&nbsp;</td>")
            End If
            If rs.Item("ClassroomStudentID") <> 0 Then
                rows(this_key).Append("<td class=list_cell><a href=""../../classroom_student/billing.aspx?ClassroomStudentID=" & rs.Item("ClassroomStudentID") & """>" & rs.Item("student_first_name") & " " & rs.Item("student_last_name") & "</a></td>")
            Else
                rows(this_key).Append("<td class=list_cell>&nbsp;</td>")
            End If
            rows(this_key).Append("<td class=list_cell>" & rs.Item("billing_method") & "</td>")
            If this_key = "check" or this_key = "bounced" Then
                rows(this_key).Append("<td class=list_cell align=center>" & rs.Item("check_no") & "</td>")
            End If
            rows(this_key).Append("<td class=list_cell>" & rs.Item("Note") & "</td>")
            rows(this_key).Append("<td class=list_cell align=right>" & Format(this_amount, "$0.00;($0.00)") & "</td>")
            rows(this_key).Append("</tr>")

            x(this_key) += 1
            total(this_key) += this_amount

        End While

below is the C# code.....

XML

while (rs.Read())
       {
           this_key = Keys(Convert.ToString(rs["BillingCode"]));
         //  this_key = keys(Convert.ToString(rs["BillingCode"].ToString()));

           if (Convert.ToInt32(x[this_key]) % 2 == 0)
           {
               rows[this_key].Append("<tr>");
              // rows[this_key].Append("<tr>");
           }
           else
           {
               rows[this_key].Append("<tr class=list_row_alt>");
           }

           if (object.ReferenceEquals(rs["amount"], DBNull.Value))
           {
               this_amount = 0;
           }
           else if (this_key == "check" | this_key == "card")
           {
               this_amount = -1 *(Convert.ToInt32( rs["amount"]));
           }
           else
           {
               this_amount =Convert.ToDecimal(rs["amount"]);
           }
           rows[this_key].Append("<td class=list_cell>" + rs["date"] + "</td>");
           rows[this_key].Append("<td class=list_cell><a href=\"../../classroom_program/billing.aspx?ClassroomProgramID=" + rs["ClassroomProgramID"] + "\">" + rs["program_title"] + "</a></td>");
           if (Convert.ToInt32(rs["SchoolID"]) != 0)
           {
               rows[this_key].Append("<td class=list_cell><a href=\"../../school/default.aspx?SchoolID=" + rs["SchoolID"] + "\">" + rs["school_name"] + "</a></td>");
           }
           else
           {
               rows[this_key].Append("<td class=list_cell>&nbsp;</td>");
           }
           if (Convert.ToInt32(rs["ClassroomStudentID"]) != 0)
           {
               rows[this_key].Append("<td class=list_cell><a href=\"../../classroom_student/billing.aspx?ClassroomStudentID=" + rs["ClassroomStudentID"] + "\">" + rs["student_first_name"] + " " + rs["student_last_name"] + "</a></td>");
           }
           else
           {
               rows[this_key].Append("<td class=list_cell>&nbsp;</td>");
           }
           rows[this_key].Append("<td class=list_cell>" + rs["billing_method"] + "</td>");
           if (this_key == "check" | this_key == "bounced")
           {
               rows[this_key].Append("<td class=list_cell align=center>" + rs["check_no"] + "</td>");
           }
           rows[this_key].Append("<td class=list_cell>" + rs["Note"] + "</td>");
           rows[this_key].Append("<td class=list_cell align=right>" + String.Format((this_amount).ToString(), "$0.00;($0.00)") + "</td>");
           rows(this_key).Append("</tr>");

           x(this_key) += 1;
           total(this_key)+= this_amount;

       }

here is the error:
rows[this_key].Append("");
Error: 'object' does not contain a definition for 'append'

Posted 10-Jun-15 22:46pm

Ranju_test

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Comments

F. Xaver 11-Jun-15 6:19am

Neither String or Object own a 'Append' method.
Looks like rows[something] is returning a different object, like a Stringbuilder.

OP should specify 'rows' definition

1 solution

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Andy Lanng · Answer 1 · 2015-06-10T23:05:00

C# can't assume the object type of row[this_key].

I think VB .Append will cast the object as a string. C#'s extension model can't do that and doesn't have the same "Append" method anyway.

Instead, try using "+=":

C#

rows[this_key] += "<\td>";

This is shorthand for:

C#

rows[this_key] = rows[this_key] + "<\td>";

The right hand side should be able to either cast or call ToString() as it is effectively concatenating two strings.

Failing that, just use the second version adding the ToString() yourself:

C#

rows[this_key] = rows[this_key].ToString() + "<\td>";