Solved

String.Format as percentage based on decimal places

Posted on 2006-06-23
6
876 Views
Last Modified: 2012-06-21
I need to format some values in a gridview.  They all need to display as a percentage (0-100%), but only show the decimals if they exist:

i.e.
  99       -->   99%
  86.56  -->   86.56%
  75.2    -->   75.2%

Is there a way to do this automatically using string.format?  If not, what's the easiest way to achieve what I need??
0
Comment
Question by:Rouchie
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 10

Accepted Solution

by:
ibost earned 250 total points
ID: 16971515
Here's an example - maybe not the most elegant:

        Dim i As Double
        i = 98.1234

   ' Find location of the decimal place, if it exists
        Dim decimalLocation As Integer = IIf(i.ToString.IndexOf(".") >= 0, i.ToString.IndexOf("."), -1)

   ' Create the format string for %... such as P0, P1, P4, etc
        Dim precision As String = IIf(decimalLocation = -1, "P0", "P" & Len(i.ToString.Substring(decimalLocation + 1)))

   ' Divide i by 100 so 98.1234 becomes .981234 and then format as percentage making it 98.1234%
        Dim s As String = (i / 100).ToString(precision)

        Response.Write(s)


Output:
98.1234 %
0
 
LVL 10

Expert Comment

by:ibost
ID: 16971528
Actually you don't need the first IIF

This:
Dim decimalLocation As Integer = IIf(i.ToString.IndexOf(".") >= 0, i.ToString.IndexOf("."), -1)

Can just be:
Dim decimalLocation = i.ToString.IndexOf(".")
0
 
LVL 12

Expert Comment

by:deanvanrooyen
ID: 16974052
does this work?

               <asp:TemplateField >
                    <ItemTemplate>
                       <asp:Label ID="lb" runat="server" Text='<%# Eval("percent") %>'></asp:Label>%
                    </ItemTemplate>
                </asp:TemplateField>
0
PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

 
LVL 25

Author Comment

by:Rouchie
ID: 16982301
ibost,
I've implemented your suggestion but it removes all decimal placing.  This isn't what I needed - I only wanted rid of the decimals if it was n.00% or n.50% for example.  Currently the value 98.27 is formatted on-screen as 99%.   Can what you've done be amended at all?
Here's my code:

Dim i As Double = e.Row.DataItem("SkillLevel")
Dim decimalLocation As Integer = i.ToString.IndexOf(".")
Dim precision As String = IIf(decimalLocation = -1, "P0", "P" & Len(i.ToString.Substring(decimalLocation + 1)))
Dim l As Label = CType(e.Row.FindControl("lbl_skillLevel"), Label)
l.Text = (i / 100).ToString(precision)

deanvanrooyen,
I believe that would just add a % sign to the end of the label, correct??  Not all entries actually have scores, so I only need formatting where a number exists.
0
 
LVL 10

Expert Comment

by:ibost
ID: 16985285
what is i equal to right after you assign it e.Row.DataItem("SkillLevel")  ?

Try to Response.Write(i.tostring()) and see what it's value is.  

The code I gave above works for me.  Assume the value is 99.234

the IndexOf the decimal is (decimalLocation) is 2.  It then sets a precision string equal to "P" + length of the substring beginning after the decimal.  In this case Len(i.ToString.SubString(decimalLocation + 1)) is equal to 3.  So precision should be P3.

Maybe try this?

Dim precision As String = IIf(decimalLocation = -1, "P0", "P" & Len(i.ToString.Substring(decimalLocation + 1)).ToString())
0
 
LVL 25

Author Comment

by:Rouchie
ID: 16985975
Sorry ibost, there was a slight error in my select statement which after tracing, showed that your first suggestion did work.

Thank you very much for your help.
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Lots of people ask this question on how to extend the “MembershipProvider” to make use of custom authentication like using existing database or make use of some other way of authentication. Many blogs show you how to extend the membership provider c…
I recently went through the process of creating a Calendar Control of events with the basis of using a database to keep track of the dates that are selectable, one requirement was to have the selected date pop-up in a simple lightbox.  At first this…
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…
Suggested Courses

732 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question