CODEWITHSUNDEEP
c#htmlclassmethods
Paul Sbraccia
Paul Sbraccia

Reputation: 21

Moving an often used function to a class and calling from HTML code

I have a function written in C# that resides on 12 individual pages of an ASPX application. I already use cs files in App_Code, so that is not the problem.

Here is the call in HTML:

<asp:Image ID="Image1" runat ="server" ImageUrl='<%# (string) FormatImageUrl( (string) Eval("Image")) %>' />

and here is the method:

protected string FormatImageUrl(string url)
{
if (url != null && url.Length > 0)
    return ("~/" + url);
else return null;
}

(A great find might I add.)

I want to move this method to App_Code and reference one instance from many pages.

I have looked into adding the namespace.function.method in the HTML code, but that throws an error.

I have also looked into using a DLL for the method, but I still can not reference it correctly in the HTML code.

Upvotes: 0

Views: 31

Answers (1)

Paul Sbraccia
Paul Sbraccia

Reputation: 21

I spent some time in think tank mode over the past couple of days and finally came up with the solution.

I created an App_Code class file named ImageFormatter.cs and it looks like this:

/// <summary>
/// Summary description for ImageFormatter
/// </summary>
public class ImageFormatter
{
    public ImageFormatter()
    {
        //
        // TODO: Add constructor logic here
        //
    }

    public static string FormatImageUrl(string url)
    {
    if (url != null && url.Length > 0)
    return ("~/" + url);
    else return null;
}
}

NOTE: I removed the NameSpace definitioin and the associated { and }.

I commented out the FormatImageUrl function in two pages of the app to test my theory.

I modified the HTML code to look like this in the same two files.

<asp:Image ID="Image1" runat ="server" ImageUrl='<%# (string) ImageFormatter.FormatImageUrl( (string) Eval("Image")) %>' />

So for those of you needing to move a function to a class:

  • create a class of appropriate name
    • place your function within the class (as I demonstrated)
    • Check for and remove NameSpace
  • make sure to comment out the function in your code page
  • modify the HTML code to include the Class Name

Upvotes: 1

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