How do I do this?

When I try this I get an error message that the Response.--- type isn't supported. That this cs file has got nothing to do with HTML.

I think I need to make it so that I am in a Page_load method, but that I want to be sure that this cannot work this way. The cs file needs to be linked to a html page. I thought via the Page.cshtml file.

default.cshtml

<!DOCTYPE html>
<html lang="en">
   <head>
       <meta charset="utf-8" />
       <title></title>
   </head>
   <body>
        <img src=@Href("Page.cshtml") />
   </body>
</html>

Page.cshtml

@using System.Drawing;

@{
   var picture = new ProduceImageFile(1.0f, 1.0f, 1.0f, 100);
}

ProduceImageFile.cs

   public ProduceImageFile(float zoomIN, float startReIN, float startImIN, int startColorIN)
   {
        zoom = zoomIN;
        startRe = startReIN;
        startIm = startImIN;
        startColor = startColorIN;

        objBitmap = new Bitmap(300, 300);
        objGraphic = Graphics.FromImage(objBitmap);

        Font font = new Font("Impact", 20, FontStyle.Regular);
        objGraphic.DrawString("Test", font, Brushes.Blue, 10, 5);
        Response.ContentType = "image/jpeg";
        Response.AddHeader("content-disposition", "inline; filename=test.jpg");
        // Render the image to the HTML output stream.
        objBitmap.Save(Response.OutputStream,
            System.Drawing.Imaging.ImageFormat.Jpeg);

        objGraphic.Dispose();
        objBitmap.Dispose();
        myPen.Dispose();
    }

Re: How do I do this?

change the path and always clrear the response

and end it

use

Response.Clear()

and

Response.End();

i think using this will be fair enough

Mark As Answer

Re: How do I do this?

I solved my problem by coding as Razor, but now I ran into another problem... Why doesn't this work? This should be so easy!

form to enter numbers

      <form method="post" action="">
            <fieldset>
                <legend>Enter parameters</legend>
                <div>
                    <label for="zoom">Range:</label>
                    <input type="text" name="Range" value="@Request["zoom"]" />
    </div>
                <div>
                    <label for="startRe">Start Real:</label>
                    <input type="text" name="StartReal" value="@Request["startRe"]" />
    </div>

The Razor code to assign the input

Re: How do I do this?

<form method="post">
<fieldset>
          <legend>Enter parameters</legend>
          <div>
               <label for="zoom">Range:</label>
               <input type="text" id="zoom" name="Range" value="@Request["Range"]" />
           </div>
           <div>
               <label for="startRe">Start Real:</label>
               <input type="text" id="startRe" name="StartReal" value="@Request["StartReal"]" />
           </div>
</fieldset>
</form>


@{
var zoom = "";
var startRe = "";
var error = "";


if(IsPost){


     zoom = Request["Range"];
     startRe = Request["StartReal"];


     float newZoom = 0;
     float newStartRe = 0;


     if(zoom.IsEmpty && startRe.IsEmpty){
          error = "Either your range or start real are empty. Try again!";
     }
     else{
         newZoom =  zoom.AsFloat();
         newStart =  startRe.AsFloat();
     }
     

     

}
}

A couple things here...

1. your "name" attributes on the input elements do not match your Request[]. (input name="zoom" can be captured by using Request["zoom"])

2. all inputs from form post method return as strings even if the users typed numbers.

3. there is no need to set the initial var (zoom and startRe) to 0.0f. You can leave these null (for more control down the stack).

4. my alteration to your code isnt the best - but it does follow some convention. (i would still check to see if the newZoom and newStartRe are in fact floats now - another if)

5. you should pay attention to what the user inputs as well. Maybe some client side validation? We don't want letters converted to floats... it'll blow up

6. we can use the error var anywhere on our page to display the message. try this: @if(!error.IsEmpty){<span class="errorClass">@error</span>}

I hope that helps... I didnt check the outcome but it should work.

Erik

Re: How do I do this?

@{
    var stringvar = "3.14";
    var floatvar = stringvar.AsFloat();
}
<!DOCTYPE html>
<html lang="en">
   <head>
       <meta charset="utf-8" />
       <title></title>
   </head>
   <body>
        @floatvar

        Answer = 0!
   </body>
</html>

Why doesn't this work?

Re: How do I do this?

Solution:

NumberFormatInfo formatInfo = new NumberFormatInfo();
    formatInfo.NumberDecimalSeparator = ".";

    if (IsPost) {
        var errors = false;
        var zoomstring = Request["Range"];
        if (zoomstring.IsFloat()) {
            zoom = float.Parse(zoomstring, formatInfo);
        }
        else {
            errors = true;
            @:Range - floating point number required.<br />
        }

Re: How do I do this?

why are you doing var floatvar?

You should cast it as float floatvar = stringvar.AsFloat();

then print @floatvar