String length to pixel conversion RSS

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  anandhan

  Member

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  44 Posts

  String length to pixel conversion

  Apr 17, 2012 10:07 AM|LINK

  Hi,

  I'm able to convert the string length to pixel, but the converted size is always exceeds above 20px than the actual size when tested in developer tools. Below is the code that i used for reference.

  //gets maximum length of string in collection
  string maxString = ListItems.OrderByDescending(m => m.Length).First();
  //converts string length to pixel
  System.Drawing.SizeF sizeF = new System.Drawing.SizeF();
  System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage(new System.Drawing.Bitmap(1, 1));
  sizeF = graphics.MeasureString(maxString, new System.Drawing.Font("Arial,Verdana,Helvetica,sans-serif", 10, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point));
  int maxTextWidthinPixel = Convert.ToInt32(sizeF.Width);

  How to correct my error in the code?

  Anandhan.S
  • Edited by anandhan on Apr 17, 2012 10:08 AM
  • Moved by XIII on Apr 29, 2012 07:18 AM
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  thomas.watso...

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  182 Points

  51 Posts

  Re: String length to pixel conversion

  Apr 17, 2012 10:09 AM|LINK

  if so why are you not just subtract 20 from resulted value?

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  Srikanth Kas...

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  4299 Points

  883 Posts

  Re: String length to pixel conversion

  Apr 17, 2012 10:10 AM|LINK

  Use like this :

  Textbox.Width = Unit.Pixel(<Your integer value>);

  
  
  

  Regards
  
  Srikanth Kasturi
  Please "Mark As Answer" if my post serves purpose.
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  anandhan

  Member

  1 Points

  44 Posts

  Re: String length to pixel conversion

  Apr 17, 2012 10:22 AM|LINK

  20 is not a contant always... it varies based on the string length..

  Anandhan.S
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  anandhan

  Member

  1 Points

  44 Posts

  Re: String length to pixel conversion

  Apr 17, 2012 10:25 AM|LINK

  Hi,

  The below code always displays the string lenth as unit. e.g. string lengh = 23, Unit is also 20, This is not converted to pixel unit.

  var maxTextWidthinPixel = Unit.Pixel(maxString.Length);

   

  Anandhan.S
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  Mamba Dai - ...

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  23530 Points

  2683 Posts

  Microsoft

  Re: String length to pixel conversion

  Apr 19, 2012 04:53 PM|LINK

  Hi,

  I test your code and Unit.Pixel, they both work fine. My tested code is the same as yours, I don't know why they couldn't work fine on your development environment. I suggest you to re-create a simple appliction to test my sample code:

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  using System.Drawing;
  
  public partial class _Default : System.Web.UI.Page
  {
      protected void Page_Load(object sender, EventArgs e)
      {
          //gets maximum length of string in collection
          string maxString = "gfdgasdf  fdafafadfasfasdfdsfas";
          //converts string length to pixel
          System.Drawing.SizeF sizeF = new System.Drawing.SizeF();
          System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage(new System.Drawing.Bitmap(1, 1));
          sizeF = graphics.MeasureString(maxString, new System.Drawing.Font("Arial,Verdana,Helvetica,sans-serif", 10,
              System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point));
  
          int maxTextWidthinPixel = Convert.ToInt32(sizeF.Width);
          int maxTextHeightinPixel = Convert.ToInt32(sizeF.Height);
          Response.Write(maxTextWidthinPixel.ToString());
          Response.Write("<br/>");
          Response.Write(maxTextHeightinPixel.ToString());
          Response.Write("<br/>");
          Response.Write(Unit.Pixel(23).Value.ToString());
          Response.Write("<br/>");
          Response.Write(Unit.Pixel(23).ToString());
      }
  }

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  anandhan

  Member

  1 Points

  44 Posts

  Re: String length to pixel conversion

  Apr 20, 2012 11:59 AM|LINK

  Hi,

  I tested your sample code & observed that Unit.Pixel is doing nothing. It's returning the string length as it is.

  • graphics.MeasureString has some problem, converted pixel is not returning the actual pixel when tested in browser using developer tools.
  • converted pixcel exceeds inconsistently than the normal text width that fits in browser.

  Anandhan.S
  • Edited by anandhan on Apr 20, 2012 11:59 AM
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  Mamba Dai - ...

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  2683 Posts

  Microsoft

  Re: String length to pixel conversion

  Apr 23, 2012 05:30 AM|LINK

  Maybe this is relative to your developer tools, not these souce code above. Could you explain what your requirement is exactly?

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  anandhan

  Member

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  44 Posts

  Re: String length to pixel conversion

  Apr 23, 2012 09:22 AM|LINK

  Mamba Dai - MSFT

  Maybe this is relative to your developer tools, not these souce code above. Could you explain what your requirement is exactly?

  My requirement is to convert the string length to pixel & assign it to div dynamically.

  Anandhan.S
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  Mamba Dai - ...

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  23530 Points

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  Microsoft

  Re: String length to pixel conversion

  Apr 24, 2012 07:36 AM|LINK

  Hi,

  anandhan

  My requirement is to convert the string length to pixel & assign it to div dynamically.

  I assume the length of string is 25, and you want to set the 25 as the value of div's width/height. If I don't misunderstand your requirement please check my sample code:

  Aspx file:

  <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %>
  
  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  
  <html xmlns="http://www.w3.org/1999/xhtml">
  <head runat="server">
      <title></title>
  </head>
  <body>
      <form id="form1" runat="server">
      <div>
          <asp:TextBox ID="txtInput" runat="server"></asp:TextBox>
          <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
          <div runat="server" id="div1">
          
          </div>
      </div>
      </form>
  </body>
  </html>

  Code behind file:

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  using System.Net;
  using System.Drawing; 
  
  public partial class Default3 : System.Web.UI.Page
  {
      protected void Page_Load(object sender, EventArgs e)
      {
          
      }
      protected void Button1_Click(object sender, EventArgs e)
      {
          //gets maximum length of string in collection  
          string maxString = txtInput.Text;
          //converts string length to pixel  
          System.Drawing.SizeF sizeF = new System.Drawing.SizeF();
          System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage(new System.Drawing.Bitmap(1, 1));
          sizeF = graphics.MeasureString(maxString, new System.Drawing.Font("Arial,Verdana,Helvetica,sans-serif", 10,
  
              System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point));
  
          int maxTextWidthinPixel = Convert.ToInt32(sizeF.Width);
          int maxTextHeightinPixel = Convert.ToInt32(sizeF.Height);
          div1.Style.Add("width", maxTextWidthinPixel.ToString());
          div1.Style.Add("border-style", "solid");
          div1.Style.Add("border-color", "Red");
          div1.InnerText = maxString;
          //div1.Style.Add("height", maxTextHeightinPixel.ToString());
          Response.Write(maxTextWidthinPixel.ToString());
          Response.Write("<br/>");
          Response.Write(maxTextHeightinPixel.ToString());
  
      }
  }

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