This is an add-in for Fody

Change string comparisons to be case insensitive.

Introduction to Fody

Usage

See also Fody usage.

NuGet installation

Install the Caseless.Fody NuGet package and update the Fody NuGet package:

PM> Install-Package Caseless.Fody
PM> Update-Package Fody

The Update-Package Fody is required since NuGet always defaults to the oldest, and most buggy, version of any dependency.

Add to FodyWeavers.xml

Add <Caseless/> to FodyWeavers.xml

<?xml version="1.0" encoding="utf-8" ?>
<Weavers>
  <Caseless/>
</Weavers>

Your Code

public bool Foo()
{
    var x = "a";
    var y = "A";
    return x == y;
}

What gets compiled

public bool Foo()
{
    var x = "a";
    var y = "A";
    return string.Equals(x, y, StringComparison.OrdinalIgnoreCase);
}

Converted Methods

The following string methods get converted to their StringComparison equivalents.

• Equality http://msdn.microsoft.com/en-us/library/system.string.op_equality
• Inequality http://msdn.microsoft.com/en-us/library/system.string.op_inequality
• Equals(String) http://msdn.microsoft.com/en-us/library/858x0yyx
• Equals(String, String) http://msdn.microsoft.com/en-us/library/1hkt4325
• Compare(String,String) http://msdn.microsoft.com/en-us/library/84787k22
• CompareTo(String) http://msdn.microsoft.com/en-us/library/35f0x18w
• EndsWith(String) http://msdn.microsoft.com/en-us/library/2333wewz
• Contains(String) http://msdn.microsoft.com/en-us/library/dy85x1sa
• IndexOf(String) http://msdn.microsoft.com/en-us/library/k8b1470s
• IndexOf(String, Int) http://msdn.microsoft.com/en-us/library/7cct0x33
• IndexOf(String, Int, Int) http://msdn.microsoft.com/en-us/library/d93tkzah
• LastIndexOf(String) http://msdn.microsoft.com/en-us/library/1wdsy8fy
• LastIndexOf(String, Int) http://msdn.microsoft.com/en-us/library/bc3z4t9d
• LastIndexOf(String, Int, Int) http://msdn.microsoft.com/en-us/library/d0z3tk9t
• StartsWith(String) http://msdn.microsoft.com/en-us/library/baketfxw

What about String.Replace

This is because there is no overload for a case insensitive replace in the .net framework.

Here is an extension method to achieve it manually. Take from this StackOverflow answer

public static class StringExtensions
{
    public static StringComparison DefaultComparison = StringComparison.OrdinalIgnoreCase;
    public static string ReplaceCaseless(this string str, string oldValue, string newValue)
    {
        var sb = new StringBuilder();

        var previousIndex = 0;
        var index = str.IndexOf(oldValue, DefaultComparison);
        while (index != -1)
        {
            sb.Append(str.Substring(previousIndex, index - previousIndex));
            sb.Append(newValue);
            index += oldValue.Length;

            previousIndex = index;
            index = str.IndexOf(oldValue, index, DefaultComparison);
        }
        sb.Append(str.Substring(previousIndex));

        return sb.ToString();
    }
}

Default String Comparison

If your don't want to use StringComparison.OrdinalIgnoreCase then you can configure the addin inside the FodyWeavers.xml file.

For example if you want to use StringComparison.InvariantCultureIgnoreCase then add the following to FodyWeavers.xml.

<?xml version="1.0" encoding="utf-8" ?>
<Weavers>
    <Caseless StringComparison="InvariantCultureIgnoreCase"/>
</Weavers>

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