.NET String.Format with variable string and number of arguments

Question

I want to create a method that accepts a string MyString and a List of strings MyList.

MyString contains placeholders like {0}, {1} and so on... but I don't know in advance how many. Example: "I want to put something here: {0} and something there: {1}"

MyList contains the strings that must be substituted in MyString, in their correct place: the first string, with index 0, must be put in the placeholder {0}.

I would like to achieve this with String.Format but I can't understand how to pass MyString as a list of arguments.

Is this possible in VB.NET?

Thank you

Tim Schmelter · Accepted Answer · 2018-05-04 11:38:36Z

1

Just convert your list to an array, then you're calling this overload:

string result = string.Format(formatString, list.ToArray());

For example:

string formatString = "I want to put something here: {0} and something there: {1}";
var list = new List<string> { "foo", "bah" };
string result = string.Format(formatString, list.ToArray());
// Result:  I want to put something here: foo and something there: bah

If you pass your list the wrong overload of String.Format is used.

Sorry for C#, here VB.NET:

Dim result = String.Format(formatString, list.ToArray())

answered May 4, 2018 at 11:38

Tim Schmelter

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1 Comment

Johannes Wentu Over a year ago

WOW! this was so damn simple but I really didn't even look for an overload! Thankx!

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