C# Lambda Expression To Replace String Values In String Array

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I am trying to use .net 4.0 lambda methodology to remove double quotes (") around items in an array. Here is the code I have, however, this does not seem to work.

What am I doing wrong?

string[] sa = new string[] { "\"Hello\"", "\"Goodbye\"", "\"Moshi\"", "\"Adios\"" };

// Trying to replace the 
Array.ForEach(sa, s => s.Replace("\"", "")); // Doesn't remove the quotes surrounding the string "Hello".
foreach(var s in sa)
   Console.WriteLine(s);

This still does not get rid of the " around the items.

There is no lambda expression that could be plugged into ForEach to accomplish your goal, because the action a lambda could take has no write access to the element, and the string itself is immutable.

What you can do is replacing the whole array, like this:

sa = sa.Select(s => s.Replace("\"", "")).ToArray();

This approach works, because it replaces the entire sa array with a newly created array that is based on sa's elements.

LINQ lambda expression to replace multiple characters in a string , Note that LINQ is not intended to be used to cause side-effects, but to Then use the String.Replace overload that takes two strings: An alternative to use with an array of objects (which you stated is the case in your question) is to use the Array. SomePropertyName = new string(value); return x; }) . Introduction. Recently I came across a scenario where I was needed to store only the first character of an input string array. It is easy to do it using loops, however I tried to get the best benefits of lambda expressions which will help write minimal number of lines to achieve this.

You can use Linq:

sa = sa.Select(s => s.Replace("\"", "")).ToArray();

OR use for loop:

for (var i = 0; i < sa.Length; i++)
    {
        sa[i] = sa[i].Replace("\"", "");
    }

How to modify string contents, The following code creates a new string by replacing existing text with a substitute. For more information on regular expression language elements, see You can produce a character array from a string, modify the contents  Lambda: The left part before the => token is the argument name, and the right part is the expression taken upon the argument. Info: The first array element in each subarray is modified. Usually, with ForEach, this style of code is not helpful. C# program that uses Array.ForEach method using System; class Program { static void Main

The other answers are what you should do if you want a new array out of some processing you perform on it's items.

However, if you don't (need a new array), and want to perform an Action on each item of the array (which is what Array.ForEach does), you could do:

//This is pretty much what your code is trying to do
Array.ForEach(sa, i => Console.WriteLine(i.Replace("\"", "")));

Manipulating a string array using a Lambda Expression, The above code has limitation that it works in fair cases and does not handle null values. besides we can replace the substring method with first method inside  Lambda: The => token separates the parameter list from the expression that returns true or false based on those arguments. But: If nothing is found, Array.Find and Array.FindAll return the default value (null or zero). C# program that uses Array.Find static method using System; class Program { static void Main()

C# Select Method (Use Lambda to Modify Elements), Then: The Select method specifies a lambda expression, which applies the string instance method ToUpper to each element in the array. Uppercase: Each string  Any lambda expression can be converted to a delegate type. The delegate type to which a lambda expression can be converted is defined by the types of its parameters and return value. If a lambda expression doesn't return a value, it can be converted to one of the Action delegate types; otherwise, it can be converted to one of the Func delegate types.

C# Array.Find Examples, Search Array With Lambda, Lambda: The => token separates the parameter list from the expression that returns Here: This example program returns a string element in the string array. Is it right to say that Your real question was "how can I replace a string containing only the letters 'one', inside a string array without looping with for/foreach/dowhile"? – Daniel MesSer Aug 3 '12 at 6:25

C# regex replace multiple matches: A how-to guide – Wipfli, Wipfli shows you how to replace multiple patterns, characters, strings and matches. each time a regular expression match is found during a Replace operation. keys or values to an array, and from the array I can get the string I needed. It proved another great use for LINQ and its extension methods: Consider storing lambdas as static fields or local variables. C# program that uses lambda cache optimization using System; using System.Diagnostics; class Program { const int _max = 1000000; static void Main () { int [] values = { 0, 10 }; // Version 1: use lambda directly in each Array.Sort call.