CODEWITHSUNDEEP
c#
Zee Fer
Zee Fer

Reputation: 339

C# appending string from variable inside double quotes

Hi I have the following line:

var table = @"<table id=""table_id"" class=""display"">

which is building a table and continues on the next line but I'm just trying to append a string at the end of table_id :

var table = @"<table id=""table_id" + instance + """ class=""display"">

so the final output (if instance = 1234) should be:

<table id="table_id1234" class="display">

But I think the quotes are throwing it off. Any suggestions on how t achieve the last line?

Thanks

Upvotes: 3

Views: 4470

Answers (4)

Osvaldo Maria
Osvaldo Maria

Reputation: 361

@ is used to escape double quotes from one string but in your example, you are actually concatenating three different strings, soyou should escape the third string as well like this:

var table = @"<table id=""table_id" + instance + @" "" class=""display"" >";

Alternatively, you could also use the StringBuilder class which is more memory efficient and might make your strings easier to read.

Upvotes: 0

Amir
Amir

Reputation: 41

I think the best idea and newest idea for this situation is $ sign before your text and with this sign you dont need to extra sign in your string

example

vat table = $"<table id='table_id{instance}' class='display'">

Upvotes: 0

Jeric Cruz
Jeric Cruz

Reputation: 1909

Try to use escape character for double quote(\") using this code:

var id = "1234";
var table = "<table id=\"table_id" + id + "\" class=\"display\">";

Here is an online tool for converting string to escape/unescape:

https://www.freeformatter.com/java-dotnet-escape.html

So you can copy the result and place your variables.

enter image description here

Upvotes: 1

Tetsuya Yamamoto
Tetsuya Yamamoto

Reputation: 24957

A string.Format method placeholder is enough to concatenate instance without cutting through quote signs ({0} is the placeholder):

var table = string.Format(@"<table id=""table_id{0}"" class=""display"">", instance);

Or you can use escape sequence \" for escaping quotes without string literal:

var table = "<table id=\"table_id" + instance + "\" class=\"display\">"

Result:

<table id="table_id1234" class="display">

Demo: .NET Fiddle

Upvotes: 7

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