Avoiding comma separator for the last value

I am generating an output on a webpage in a format l开发者_StackOverflowike this

({"1":"Jeff","2":"Tom","3":"Michael",})

For this, basically this is the code I am using

Response.Write("(" + "{");
//
for (Int32 i = 0; i < k.Length; i++)
{
  Response.Write(Convert.ToString(k.GetValue(i)) + ",");
}
//
Response.Write("}" + ")");

Notice my output, after Michael" there is a comma which I do not want since this is the last vaue but this is appearing since , is in the for loop. How to prevent this/remove this last comma from appearing?

My output should be ({"1":"Jeff","2":"Tom","3":"Michael"}) (There's no comma after last value here)

---

Assuming k is an array of strings

List<string> tokens = k.ToList<string>();
Response.Write("({" + String.join<string>(",", tokens) + "})");

---

Simplified and VB.Net, but i think you will get it:

Dim values As New List(Of String)(New String() {"1:Jeff", "2:Tom", "3:Michael"})
Dim result As String = "({" & String.Join(",", values.ToArray) & "})"

If k is a Collection like Array,List etc.

---

Depending on the number of iterations and how often this happens use StringBuilder instead.

StringBuilder sb = new StringBuilder();

for (Int32 i = 0; i < k.Length; i++)
{
    sb.Append(",");
    sb.Append(Convert.ToString(k.GetValue(i)));
}
if (sb.Length > 0)  {
    sb.Remove(0,1);
}
Response.Write(String.Format("({{{0}}})", sb.ToString()));

Another way is: However, it has to check every iteration.

StringBuilder sb = new StringBuilder();

for (Int32 i = 0; i < k.Length; i++)
{
    if (sb.Length > 0) { 
      sb.Append(","); 
    }
    sb.Append(Convert.ToString(k.GetValue(i)));
}
Response.Write(String.Format("({{{0}}})", sb.ToString()));

---

you can decrease your loop instead increase... like

for (Int32 i = k.Length; i > 0; i--)

and put: if (i == 1) removeComa;

---

Response.Write("(" + "{");
//
for (Int32 i = 0; i < k.Length; i++)
{
  Response.Write(Convert.ToString(k.GetValue(i)) + (i == k.Length - 1 ? "" : ","));
}
//
Response.Write("}" + ")");

---

One of my favorite fixes for this is to use a prepend instead and only set comma as the seperator value after the first item (sorry for the VB):

    Dim seperator As String = ""

    For i As Integer = 0 To k.Length
        Response.Write(seperator + Convert.ToString(k.GetValue(i)))
        seperator = ","
    Next

---

In your loop, simply use insert a "break" when the count reaches the last digit and that has been processed?

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If you change how you output to write the first object in the collection then everyone after preceded by a comma it should work fine.

        Response.Write("(" + "{");
        //
        Response.Write(Convert.ToString(k.GetValue(0)));
        for (Int32 i = 1; i < k.Length; i++)
        {
            Response.Write("," + Convert.ToString(k.GetValue(i)));
        }
        //
        Response.Write("}" + ")");

An alternative would be writing to a stringbuilder and outputting all but the last character