("{0} world!","hello") //The output hello world! , no problem, but just add a brace anywhere in the first parameter:
("{0} wo{rld!","hello") //An exception will be generated, and the exception message is: Input string was not in a correct format.
//Solution:("{0} wo{{rld!","hello")
//or
("{0} wo{1}rld!","hello","{")
//They will all output hello world!