C# String with [@]

Question

i am here to ask if there are any ways to put variables inside "@" Strings in C#. Such that the id in the following code, can be changeable.

        string xml = @"
        <S>
          <child id='1'/>
          <child id='2'>
            <grandchild id='3' />
            <grandchild id='4' />
          </child>
        </S>";

The XElement/XAttribute constructors are made to work in a similarly constructable fashion. — Brannon
– Brannon, Commented Jul 3, 2012 at 4:14
if you are making XML, use C#s XML facilities. Hand rolling it is just asking for trouble — Keith Nicholas
– Keith Nicholas, Commented Jul 3, 2012 at 4:17

Robert Levy · Accepted Answer · 2012-07-03 04:13:07Z

3

take a look at the string.Format method

var result = string.Format(@"<S> 
          <child id='{0}'/> 
          <child id='{1}'> 
            <grandchild id='{2}' /> 
            <grandchild id='{3}' /> 
          </child> 
        </S>", id1, id2, id3, id4);

answered Jul 3, 2012 at 4:13

Robert Levy

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Ben Voigt · Accepted Answer · 2012-07-03 04:12:55Z

3

Not directly (C# doesn't have interpolation), but you can pass an @-string to string.Format or string.Concat. (or, for the masochasists, Regex.Replace)

answered Jul 3, 2012 at 4:12

Ben Voigt

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Paolo del Mundo · Accepted Answer · 2012-07-03 04:14:24Z

2

You can use string.Format:

string.Format(@"<S>
          <child id='{0}'/>
          <child id='{1}'>
            <grandchild id='3' />
            <grandchild id='4' />
          </child>
        </S>", childId1, childId2);

answered Jul 3, 2012 at 4:14

Paolo del Mundo

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Comments

Karl-Johan Sjögren · Accepted Answer · 2012-07-03 04:18:33Z

2

Use string.Format() to insert values into your string at runtime. More info about it can be found on MSDN.

    string xml = string.Format(@"
    <S>
      <child id='{0}'/>
      <child id='{1}'>
        <grandchild id='{2}' />
        <grandchild id='{3}' />
      </child>
    </S>", id1, id2, id3, id4);

This isn't the recommended way to create XML though since you will have to make sure that any value you insert is properly escaped for it's location but as long as you are strictly inserting numerical values this shouldn't be a problem.

answered Jul 3, 2012 at 4:18

Karl-Johan Sjögren

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2 Comments

Robert Levy Over a year ago

the majority of this looks like copy/paste from other answers but +1 anyways for pointing out that its possibly unsafe

Karl-Johan Sjögren Over a year ago

Most of the answers were written within a few minutes of the post, so no one really had time to copy 'n paste anybody. There were only Ben Voigts answer when I started writing mine and I though it lacked some explanation. When I was done others had already submitted their answers though.

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