/// <summary>
/// Determines whether the specified <paramref name="c"/> contains an entry with the specified <paramref name="key"/>.
/// </summary>
/// <param name="c">The <see cref="NameValueCollection"/> to search for <paramref name="key"/>.</param>
/// <param name="key">The key to locate in <paramref name="c"/>.</param>
/// <returns><c>true</c> if the specified <paramref name="c"/> contains an entry with the <paramref name="key"/>; otherwise, <c>false</c>.</returns>
/// <remarks>This method performs an <see cref="StringComparison.OrdinalIgnoreCase"/> search for <paramref name="key"/>.</remarks>
public static bool ContainsKey(NameValueCollection c, string key)
{
if (c == null)
{
return(false);
}
if (key == null)
{
return(false);
}
if (c.Get(key) == null)
{
return(EnumerableUtility.Contains(c.AllKeys, key, StringComparer.OrdinalIgnoreCase));
}
return(true);
}