public int IndexOf(String value, int startIndex, int count, StringComparison comparisonType)
{
// Validate inputs
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
if (startIndex < 0 || startIndex > this.Length)
{
throw new ArgumentOutOfRangeException(nameof(startIndex), Environment.GetResourceString("ArgumentOutOfRange_Index"));
}
if (count < 0 || startIndex > this.Length - count)
{
throw new ArgumentOutOfRangeException(nameof(count), Environment.GetResourceString("ArgumentOutOfRange_Count"));
}
Contract.EndContractBlock();
switch (comparisonType)
{
case StringComparison.CurrentCulture:
return(CultureInfo.CurrentCulture.CompareInfo.IndexOf(this, value, startIndex, count, CompareOptions.None));
case StringComparison.CurrentCultureIgnoreCase:
return(CultureInfo.CurrentCulture.CompareInfo.IndexOf(this, value, startIndex, count, CompareOptions.IgnoreCase));
case StringComparison.InvariantCulture:
return(CultureInfo.InvariantCulture.CompareInfo.IndexOf(this, value, startIndex, count, CompareOptions.None));
case StringComparison.InvariantCultureIgnoreCase:
return(CultureInfo.InvariantCulture.CompareInfo.IndexOf(this, value, startIndex, count, CompareOptions.IgnoreCase));
case StringComparison.Ordinal:
return(CultureInfo.InvariantCulture.CompareInfo.IndexOf(this, value, startIndex, count, CompareOptions.Ordinal));
case StringComparison.OrdinalIgnoreCase:
if (value.IsAscii() && this.IsAscii())
{
return(CultureInfo.InvariantCulture.CompareInfo.IndexOf(this, value, startIndex, count, CompareOptions.IgnoreCase));
}
else
{
return(TextInfo.IndexOfStringOrdinalIgnoreCase(this, value, startIndex, count));
}
default:
throw new ArgumentException(Environment.GetResourceString("NotSupported_StringComparison"), nameof(comparisonType));
}
}
public int IndexOf(String value, int startIndex, int count, StringComparison comparisonType)
{
// Validate inputs
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
if (startIndex < 0 || startIndex > this.Length)
{
throw new ArgumentOutOfRangeException(nameof(startIndex), SR.ArgumentOutOfRange_Index);
}
if (count < 0 || startIndex > this.Length - count)
{
throw new ArgumentOutOfRangeException(nameof(count), SR.ArgumentOutOfRange_Count);
}
switch (comparisonType)
{
case StringComparison.CurrentCulture:
return(CultureInfo.CurrentCulture.CompareInfo.IndexOf(this, value, startIndex, count, CompareOptions.None));
case StringComparison.CurrentCultureIgnoreCase:
return(CultureInfo.CurrentCulture.CompareInfo.IndexOf(this, value, startIndex, count, CompareOptions.IgnoreCase));
case StringComparison.InvariantCulture:
return(CultureInfo.InvariantCulture.CompareInfo.IndexOf(this, value, startIndex, count, CompareOptions.None));
case StringComparison.InvariantCultureIgnoreCase:
return(CultureInfo.InvariantCulture.CompareInfo.IndexOf(this, value, startIndex, count, CompareOptions.IgnoreCase));
case StringComparison.Ordinal:
return(CultureInfo.InvariantCulture.CompareInfo.IndexOf(this, value, startIndex, count, CompareOptions.Ordinal));
case StringComparison.OrdinalIgnoreCase:
return(TextInfo.IndexOfStringOrdinalIgnoreCase(this, value, startIndex, count));
default:
throw new ArgumentException(SR.NotSupported_StringComparison, nameof(comparisonType));
}
}
