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String.ReplaceLast.cs
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String.ReplaceLast.cs
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// Description: C# Extension Methods | Enhance the .NET Framework and .NET Core with over 1000 extension methods.
// Website & Documentation: https://csharp-extension.com/
// Issues: https://github.com/zzzprojects/Z.ExtensionMethods/issues
// License (MIT): https://github.com/zzzprojects/Z.ExtensionMethods/blob/master/LICENSE
// More projects: https://zzzprojects.com/
// Copyright © ZZZ Projects Inc. All rights reserved.
using System;
using System.Collections.Generic;
using System.Linq;
public static partial class Extensions
{
/// <summary>
/// A string extension method that replace last occurence.
/// </summary>
/// <param name="this">The @this to act on.</param>
/// <param name="oldValue">The old value.</param>
/// <param name="newValue">The new value.</param>
/// <returns>The string with the last occurence of old value replace by new value.</returns>
public static string ReplaceLast(this string @this, string oldValue, string newValue)
{
int startindex = @this.LastIndexOf(oldValue);
if (startindex == -1)
{
return @this;
}
return @this.Remove(startindex, oldValue.Length).Insert(startindex, newValue);
}
/// <summary>
/// A string extension method that replace last numbers occurences.
/// </summary>
/// <param name="this">The @this to act on.</param>
/// <param name="number">Number of.</param>
/// <param name="oldValue">The old value.</param>
/// <param name="newValue">The new value.</param>
/// <returns>The string with the last numbers occurences of old value replace by new value.</returns>
public static string ReplaceLast(this string @this, int number, string oldValue, string newValue)
{
List<string> list = @this.Split(oldValue).ToList();
int old = Math.Max(0, list.Count - number - 1);
IEnumerable<string> listStart = list.Take(old);
IEnumerable<string> listEnd = list.Skip(old);
return string.Join(oldValue, listStart) +
(old > 0 ? oldValue : "") +
string.Join(newValue, listEnd);
}
}