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04 Dec 2015 by K Bonneau
Case Insensitive String.Replace Extension MethodContract
GlobalExtensionMethods
public static string Replace(
this string source,
string oldValue,
string newValue,
StringComparison comparisonType);
Test Cases
Replaces_WhenCaseMatches
Created By K Bonneau
public void Replaces_WhenCaseMatches()
{
var source = "I want to replace THIS with THAT.";
var expected = "I want to replace THAT with THAT.";
Assert.AreEqual(expected, source.Replace("THIS","THAT", StringComparison.CurrentCulture));
}
Replaces_WhenCaseDoesNotMatchAndStringComparisonIsCaseInSensitive
Created By K Bonneau
public void Replaces_WhenCaseDoesNotMatchAndStringComparisonIsCaseInSensitive()
{
var source = "I want to replace THIS with THAT.";
var expected = "I want to replace THAT with THAT.";
Assert.AreEqual(expected, source.Replace("this","THAT", StringComparison.OrdinalIgnoreCase));
}
WorksForOtherCultures
Created By K Bonneau
using System.Globalization;
public void WorksForOtherCultures()
{
Thread.CurrentThread.CurrentCulture = new CultureInfo("tr-TR");
var source = "I want to replace THIS with THAT.";
var expected = "I want to replace THAT with THAT.";
Assert.AreEqual(expected, source.Replace("this", "THAT", StringComparison.OrdinalIgnoreCase));
}
DoesNotReplace_WhenCaseDoesNotMatchAndStringComparisonIsCaseSensitive
Created By K Bonneau
public void DoesNotReplace_WhenCaseDoesNotMatchAndStringComparisonIsCaseSensitive()
{
var source = "I want to replace THIS with THAT.";
var expected = "I want to replace THIS with THAT.";
Assert.AreEqual(expected, source.Replace("this","THAT", StringComparison.CurrentCulture));
}
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04 Dec 2015 by K Bonneau
public static class GlobalExtensionMethods
{
public static string Replace(
this string source,
string oldValue,
string newValue,
StringComparison comparisonType)
{
StringBuilder sb = new StringBuilder();
int previousIndex = 0;
int index = source.IndexOf(oldValue, comparisonType);
while (index != -1)
{
sb.Append(source.Substring(previousIndex, index - previousIndex));
sb.Append(newValue);
index += oldValue.Length;
previousIndex = index;
index = source.IndexOf(oldValue, index, comparisonType);
}
sb.Append(source.Substring(previousIndex));
return sb.ToString();
}
}
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Test Case Run Summary
Replaces_WhenCaseMatches
Replaces_WhenCaseDoesNotMatchAndStringComparisonIsCaseInSensitive
WorksForOtherCultures
DoesNotReplace_WhenCaseDoesNotMatchAndStringComparisonIsCaseSensitive
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