/// <summary>Returns a hash code for the given object, using a hashing algorithm that ignores the case of strings.</summary>
/// <returns>A hash code for the given object, using a hashing algorithm that ignores the case of strings.</returns>
/// <param name="obj">The <see cref="T:System.Object" /> for which a hash code is to be returned. </param>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="obj" /> is null. </exception>
/// <filterpriority>2</filterpriority>
/// <PermissionSet>
/// <IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="UnmanagedCode" />
/// </PermissionSet>
public int GetHashCode(object obj)
{
if (obj == null)
{
throw new ArgumentNullException("obj");
}
string text = obj as string;
if (text == null)
{
return(obj.GetHashCode());
}
int num = 0;
if (this.m_text != null && !CaseInsensitiveHashCodeProvider.AreEqual(this.m_text, CultureInfo.InvariantCulture))
{
foreach (char c in this.m_text.ToLower(text))
{
num = num * 31 + (int)c;
}
}
else
{
for (int j = 0; j < text.Length; j++)
{
char c = char.ToLower(text[j], CultureInfo.InvariantCulture);
num = num * 31 + (int)c;
}
}
return(num);
}
/// <summary>Initializes a new instance of the <see cref="T:System.Collections.CaseInsensitiveHashCodeProvider" /> class using the <see cref="P:System.Threading.Thread.CurrentCulture" /> of the current thread.</summary>
public CaseInsensitiveHashCodeProvider()
{
CultureInfo currentCulture = CultureInfo.CurrentCulture;
if (!CaseInsensitiveHashCodeProvider.AreEqual(currentCulture, CultureInfo.InvariantCulture))
{
this.m_text = CultureInfo.CurrentCulture.TextInfo;
}
}
/// <summary>Initializes a new instance of the <see cref="T:System.Collections.CaseInsensitiveHashCodeProvider" /> class using the specified <see cref="T:System.Globalization.CultureInfo" />.</summary>
/// <param name="culture">The <see cref="T:System.Globalization.CultureInfo" /> to use for the new <see cref="T:System.Collections.CaseInsensitiveHashCodeProvider" />. </param>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="culture" /> is null. </exception>
public CaseInsensitiveHashCodeProvider(CultureInfo culture)
{
if (culture == null)
{
throw new ArgumentNullException("culture");
}
if (!CaseInsensitiveHashCodeProvider.AreEqual(culture, CultureInfo.InvariantCulture))
{
this.m_text = culture.TextInfo;
}
}