restlessmedia. posts from a UK web developer and music enthusiast.

This will provide an Extension Method to enable you to perform a safer contains search within a string.

For projects built on framework v2.0, make sure you include:

namespace System.Runtime.CompilerServices
{
  [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class
  | AttributeTargets.Method)]
  public sealed class ExtensionAttribute : Attribute
  {
    public ExtensionAttribute() { }
  }
}

Here’s the method:

public static bool Contains(this string searchWithin, 
string value, StringComparison comparisonOptions)
{
    if (value.Length == 0)
    {
        return true;
    }
    for (int i = 0; i < (searchWithin.Length - value.Length); i++)
    {
        if (searchWithin.Substring(i, value.Length).Equals(value, comparisonOptions))
        {
            return true;
        }
    }
    return false;
}
something.Contains(somethingElse, StringComparison.CurrentCultureIgnoreCase);

See here http://groups.google.com/group/microsoft.public.dotnet.languages.csharp/browse_thread/thread/ebc4258ed2c4270f/c48b6c15df01e8bf?pli=1 for more information on the issue.

Wednesday Sep 22nd

• csharp
• development