String formatting error

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AAAAAARRRRGGGH! I'm going out of my mind.

I'm simply trying to do this:

C#

string result = string.Format(htmlText, plainTexts);

where

C#

htmlText = @"{0}<tr style="padding: 0; border-removed 0"><td style="padding: 0; border-removed 0; width: 75px">{1}</td><td style="padding: 0; border-removed 0">{2}</td></tr>";

And plainTexts is a List of string containing 3 elements:

C#

plainTexts[0] = "   ";
plainTexts[1] = "foo";
plainTexts[2] = "bar";

and I get this exception in the string.Format line:

Unhandled Exception: System.FormatException:
    Index (zero based) must be greater than or equal to zero and less
    than the size of the argument list.

WHY WHY WHY? I've got three placeholders, correctly numbered and a list of three arguments. As far as I can see, everything is in perfect working order.

WHAT AM I MISSING???

Posted 8-Mar-15 23:30pm

Johnny J.

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Comments

V. 9-Mar-15 5:34am

htmlText? The quotes are not escaped and the strings not concatenated. But that could be the format on CP of course. (likely, because that wouldn't compile, right?)

Johnny J. 9-Mar-15 5:36am

The quotes are escaped (that's what @ does), but this is only an example. I'm not entering the html text manually in code like above, I'm parsing them from a webbrowser source, and they are valid strings...

1 solution

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Praneet Nadkar · Accepted Answer · 2015-03-08T23:37:00

Solution 1

This worked for me:

C#

string htmlText = @"{0}<tr style="" border-removed="" 0=""><td style="" border-removed="" 75px="">{1}</td><td style="" border-removed="" 0="">{2}</td></tr>";
string[] plainTexts = new string[3];
plainTexts[0] = "   ";
plainTexts[1] = "foo";
plainTexts[2] = "bar";
string result = string.Format(htmlText, plainTexts);

Posted 8-Mar-15 23:37pm

Praneet Nadkar

Comments

Johnny J. 9-Mar-15 5:39am

You're using a string array, I'm using a genereic list of strings. But even if I do a plainTexts.ToArray(), it still doesn't work for me.

[no name] 9-Mar-15 5:42am

ok letme try with list

Johnny J. 9-Mar-15 5:43am

Correction: It DOES actually work with an array of string if I do ToArray(), but I get a warning from VS: Co-variant array conversion from string[] to object[] can cause run-time exception on write operation

[no name] 9-Mar-15 5:52am

Try this:
string result = string.Format(htmlText, plainTexts.Cast<object>().ToArray());

warning is about the implicit conversion of string[] to object[].

Johnny J. 9-Mar-15 5:54am

Cool. That took care of the warning! Thanks!

[no name] 9-Mar-15 5:56am

Glad it worked for you !! :)

String formatting error

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String formatting error

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