Why does String.Format give inputString not formatted error for this String

Question

So i have a VB.net String here that looks as such below. I have another string startId that i wish is substituted in the appropriate places. So i wrote the following lines.

Dim jsonPayloadHeaderFormat As String = "Content-Type: application/json;charset=UTF-8" & "\r\n" & "Content-ID: {0}" & "\r\n" & "Content-Disposition: attachment; filename={0}" & "\r\n" & "{" & "\r\n"
    String.Format(jsonPayloadHeaderFormat, startId)

But i get a input string not in correct format error. I am new to vb.net and can't seem to get it. Please advise.

You have an open { at the end. If it's intentional, then see ways to escape { in string.format function in vb. — LarsTech
– LarsTech, Commented Nov 6, 2014 at 12:31
Because of the {\r\n at the end. { indidcates that you want to begin a new element. Opening and closing braces are required. — Tim Schmelter
– Tim Schmelter, Commented Nov 6, 2014 at 12:33
or if the intention is to emit a { character, it must be escaped, using {{ — James Thorpe
– James Thorpe, Commented Nov 6, 2014 at 12:36

Tim Schmelter · Accepted Answer · 2014-11-06 12:37:30Z

2

Because of the {\r\n at the end. { indidcates that you want to begin a new element. Opening and closing braces are required. Read the remarks section.

You also have to assign the new string which is returned from String.Format to a string variable:

Dim jsonPayloadHeaderFormat As String = "Content-Type: application/json;charset=UTF-8" & "\r\n" & "Content-ID: {0}" & "\r\n" & "Content-Disposition: attachment; filename={0}" & "\r\n\r\n"
Dim result As String = String.Format(jsonPayloadHeaderFormat, startId)

answered Nov 6, 2014 at 12:37

Tim Schmelter

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