How to escape braces (curly brackets) in a format string in .NET

Question

How can brackets be escaped in using string.Format.

For example:

String val = \"1,2,3\"
String.Format(\" foo {{0}}\", val); 


        

Answer 1

My objective:

I needed to assign the value "{CR}{LF}" to a string variable delimiter.

Code c#:

string delimiter= "{{CR}}{{LF}}";

Note: To escape special characters normally you have to use . For opening curly bracket {, use one extra like {{. For closing curly bracket }, use one extra }}.

Answer 2

[TestMethod]
public void BraceEscapingTest()
{
    var result = String.Format("Foo {{0}}", "1,2,3");  //"1,2,3" is not parsed
    Assert.AreEqual("Foo {0}", result);

    result = String.Format("Foo {{{0}}}", "1,2,3");
    Assert.AreEqual("Foo {1,2,3}", result);

    result = String.Format("Foo {0} {{bar}}", "1,2,3");
    Assert.AreEqual("Foo 1,2,3 {bar}", result);

    result = String.Format("{{{0:N}}}", 24); //24 is not parsed, see @Guru Kara answer
    Assert.AreEqual("{N}", result);

    result = String.Format("{0}{1:N}{2}", "{", 24, "}");
    Assert.AreEqual("{24.00}", result);

    result = String.Format("{{{0}}}", 24.ToString("N"));
    Assert.AreEqual("{24.00}", result);
}

Answer 3

or you can use c# string interpolation like this (feature available in C# 6.0)

var value = "1, 2, 3";
var output = $" foo {{{value}}}";

Answer 4

Almost there! The escape sequence for a brace is {{ or }} so for your example you would use:

string t = "1, 2, 3";
string v = String.Format(" foo {{{0}}}", t);