ARTICLE

Web based colour tool in VB .NET

Posted by Rob Articles | Visual Basic .NET November 10, 2012
This article gives you information about the System.Drawing namespace, which is very useful while working with colours in your .net projects
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Introduction

The .NET Framework provides us with over 100 colours to use within the System.Drawing namespace. In order that we know exactly what all these colours look like here is a simple web based tool that uses Reflection to loop through all the colours with the System.Drawing.Color struct and print them to the page.

Code

<%@ Page Language="C#" %>

<%@ Import Namespace="System.Reflection" %>

<%@ Import Namespace="System.Drawing" %>

<%@ Import Namespace="System.Drawing.Imaging" %>

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

 

<script runat="server">

 

Protected Sub Page_Load(ByVal sender As ObjectByVal e As EventArgs) 

    Dim t As Type = GetType(System.Drawing.Color) 

    For Each fi As PropertyInfo In t.GetProperties()

        If fi.PropertyType.ToString() = "System.Drawing.Color" Then

            Dim colorName As String = fi.Name 

            Dim lbl As New Label()

            Dim lit As New LiteralControl()

            Dim c As Color = System.Drawing.Color.FromName(colorName) 

            lit.Text = "System.Drawing.Color." + colorName 

            lbl.BackColor = c

            lbl.Width = Unit.Pixel(300)

            lbl.Height = Unit.Pixel(20)

            lbl.BorderWidth = Unit.Pixel(1) 

            phl.Controls.Add(lbl)

            phl.Controls.Add(New LiteralControl("&nbsp;"))

            phl.Controls.Add(lit)

            phl.Controls.Add(New LiteralControl("<br />"))

        End If

    Next 

End Sub 

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >

<head id="Head1" runat="server">

    <title>System.Drawing.Color</title>

</head>

<body>

    <form id="form1" runat="server">

    <asp:PlaceHolder ID="phl" runat="server"></asp:PlaceHolder>

    </form>

</body>

</html>

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