Exception is thrown when using {StringToReplace} and {0} in String.Format()

Question

As Example,

string str= string.Format(@"<p style=""font-family:Times New Roman, serif;font-size: 12pt;"" >Total Qty {qty} on Date {0} </p>",dr["Date"]);

I want to replace qty later on.It throws exception "Input string was not in a correct format".

Can anyone tell the reason and possible solution?

In short: The `{qty}` string representation doesn't have equivalent source to show up. "@" sign used for literal string, use "$" instead. — Tetsuya Yamamoto, Jan 20 '17 at 04:44
Do you want the formatted string to be `"Total Qty {qty} on Date 01/01/2017"` or `"Total Qty 10 on Date 01/01/2017"` if say the value of qty is 10 ? — sudheeshix, Jan 20 '17 at 05:16
Correct solution is string str= string.Format(@"
Total Qty {{qty}} on Date {0}
","01/01/2017"); — Amit Bhatt, Jan 20 '17 at 07:29

sujith karivelil · Accepted Answer · 2017-01-20T07:36:29.670

3

I think you should use like this :

string str= string.Format(@"Total Qty {{qty}} on Date {0}","01/01/2017");

to get the output as Total Qty {qty} on Date 01/01/2017. you have not give any notes on the qty, If it is a variable and you wanted to display its value in between { and } then you should use $ instead for @ and this time the code will be like this:

int qty = 10;
string str = string.Format($"Total Qty : {qty} on Date : {{0}}","01/01/2017");

This time you will get the output as Total Qty : 10 on Date : 01/01/2017

edited Jan 20 '17 at 07:36

answered Jan 20 '17 at 04:47

sujith karivelil

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@MohitShrivastava: it would be great – sujith karivelil Jan 20 '17 at 05:04
string str= string.Format(@"Total Qty {{qty}} on Date {0}","01/01/2017"); works!! thanks – Amit Bhatt Jan 20 '17 at 07:32
@AmitBhatt: Glad to hear that It worked. happy codding. You can mark it as accepted if it completely solves your problem – sujith karivelil Jan 20 '17 at 07:33
how you replaced {qty} with 10 in string.Format($"Total Qty : {qty} on Date : {{0}}","01/01/2017"); – Amit Bhatt Jan 20 '17 at 07:35
Where `qty` is an integer variable initialized with `10` see the updates – sujith karivelil Jan 20 '17 at 07:37

score 2 · Answer 2 · edited May 23 '17 at 11:45

2

I think you should use $ instead of @ because. In String Interpolation , we simply prefix the string with a $ (much like we use the @ for verbatim strings). Then, we simply surround the expressions we want to interpolate with curly braces (i.e. { and })

int qty = 10;
string str = string.Format($"Total Qty {qty} on Date {{0}}","01/01/2017");
Console.WriteLine(str);

The output is

Total Qty 10 on Date 01/01/2017

The Working fiddle can be seen

edited May 23 '17 at 11:45

Community

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answered Jan 20 '17 at 04:43

Mohit S

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This throw an error. Expression expected on $ and at the end of the code. – Willy David Jr Jan 20 '17 at 04:45
The fiddle says `Total Qty 10 on Date 0` then where is the supplied date `"01/01/2017"` – sujith karivelil Jan 20 '17 at 05:00
@MohitShrivastava : I don't have the privilege to remove other's votes. down voter will remove that for you, anyway the fiddle is still says `Total Qty 10 on Date 0` – sujith karivelil Jan 20 '17 at 05:10
@un-lucky Sorry I haven't updated the Fiddle path. Now its been updated. Thanks :) – Mohit S Jan 20 '17 at 06:12

score 1 · Answer 3 · answered Jan 20 '17 at 05:03

1

You need to use this format:

$"Total Qty {qty} on Date {{0}}","01/01/2017"

Here is a working example: https://dotnetfiddle.net/UJjJyS

answered Jan 20 '17 at 05:03

sudheeshix

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assuming you dont want the formatted string to be `"Total Qty {qty} on Date 01/01/2017"` but want it as `"Total Qty 10 on Date 01/01/2017"` where qty has a value of 10. – sudheeshix Jan 20 '17 at 05:18

Exception is thrown when using {StringToReplace} and {0} in String.Format()

3 Answers3