/// <summary>
/// Generates a url pointing to the website placehold.it.
/// </summary>
/// <param name="size">The size of the image</param>
/// <param name="format">The format the image</param>
/// <param name="backgroundColor">The image background color.</param>
/// <param name="textColor">The image text/foreground color.</param>
/// <param name="text">The text on the image.</param>
/// <returns>The generated image.</returns>
/// <exception cref="ArgumentException">
/// <para>
/// If the <paramref name="size" /> is not in the format '300' and not in the format '300x300'.
/// </para>
/// <para>
/// If the background color is not a hex color value without '#'
/// </para>
/// <para>
/// If the text color is not a hex color value without '#'
/// </para>
/// </exception>
public static string Placeholdit(
string size = "300x300",
PlaceholditImageFormat format = PlaceholditImageFormat.png,
string backgroundColor = null,
string textColor = null,
string text = null)
{
if (!Regex.IsMatch(size, @"^[0-9]+(x[0-9]+)?$"))
throw new ArgumentException("size should be specified in format '300' or '300x300", "size");
var regex = new Regex("^(?:[A-Fa-f0-9]{3}|[A-fa-f0-9]{6})$");
if (backgroundColor != null && !regex.IsMatch(backgroundColor))
throw new ArgumentException("backgroundColor must be a hex value without '#'", "backgroundColor");
if (textColor != null && !regex.IsMatch(textColor))
throw new ArgumentException("textColor must be a hex value without '#'", "textColor");
var imageUrl = "https://placehold.it/" + size;
if (!string.IsNullOrEmpty(backgroundColor))
imageUrl += "/" + backgroundColor;
if (!string.IsNullOrEmpty(textColor))
{
if (string.IsNullOrEmpty(backgroundColor))
imageUrl += "/D3D3D3";
imageUrl += "/" + textColor;
}
imageUrl += "." + format;
if (!string.IsNullOrEmpty(text))
imageUrl += "?text=" + text;
return imageUrl;
}
/// <summary>
/// Generates a url pointing to the website placehold.it.
/// </summary>
/// <param name="size">The size of the image</param>
/// <param name="format">The format the image</param>
/// <param name="backgroundColor">The image background color.</param>
/// <param name="textColor">The image text/foreground color.</param>
/// <param name="text">The text on the image.</param>
/// <returns>The generated image.</returns>
/// <exception cref="ArgumentException">
/// <para>
/// If the <paramref name="size" /> is not in the format '300' and not in the format '300x300'.
/// </para>
/// <para>If the background color is not a hex color value without '#'</para>
/// <para>If the text color is not a hex color value without '#'</para>
/// </exception>
public static string Placeholdit(
string size = "300x300",
PlaceholditImageFormat format = PlaceholditImageFormat.png,
string backgroundColor = null,
string textColor = null,
string text = null)
{
if (!Regex.IsMatch(size, @"^[0-9]+(x[0-9]+)?$"))
{
throw new ArgumentException("size should be specified in format '300' or '300x300", "size");
}
var regex = new Regex("^(?:[A-Fa-f0-9]{3}|[A-fa-f0-9]{6})$");
if (backgroundColor != null && !regex.IsMatch(backgroundColor))
{
throw new ArgumentException("backgroundColor must be a hex value without '#'", "backgroundColor");
}
if (textColor != null && !regex.IsMatch(textColor))
{
throw new ArgumentException("textColor must be a hex value without '#'", "textColor");
}
var imageUrl = "https://placehold.it/" + size;
if (!string.IsNullOrEmpty(backgroundColor))
{
imageUrl += "/" + backgroundColor;
}
if (!string.IsNullOrEmpty(textColor))
{
if (string.IsNullOrEmpty(backgroundColor))
{
imageUrl += "/D3D3D3";
}
imageUrl += "/" + textColor;
}
imageUrl += "." + format;
if (!string.IsNullOrEmpty(text))
{
imageUrl += "?text=" + text;
}
return(imageUrl);
}