?
Solved

String.Format as percentage based on decimal places

Posted on 2006-06-23
6
Medium Priority
?
894 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
  • 3
  • 2
6 Comments
 
LVL 10

Accepted Solution

by:
ibost earned 1000 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
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
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: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say 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

A quick way to get a menu to work on our website, is using the Menu control and assign it to a web.sitemap using SiteMapDataSource. Example of web.sitemap file: (CODE) Sample code to add to the page menu: (CODE) Running the application, we wi…
User art_snob (http://www.experts-exchange.com/M_6114203.html) encountered strange behavior of Android Web browser on his Mobile Web site. It took a while to find the true cause. It happens so, that the Android Web browser (at least up to OS ver. 2.…
As many of you are aware about Scanpst.exe utility which is owned by Microsoft itself to repair inaccessible or damaged PST files, but the question is do you really think Scanpst.exe is capable to repair all sorts of PST related corruption issues?
The Relationships Diagram is a good way to get an overall view of what a database is keeping track of. It is also where relationships are defined. A relationship specifies how two tables connect to each other. As you build tables in Microsoft Ac…

621 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