Add support for binding decimal, double, float data type with configurable formatting

[Andrzej-W]

This should work

<input @bind="@price"/>

@code
{
    decimal price;
}

but currently we get an exception:
Error: System.ArgumentException: 'bind' does not accept values of type System.Decimal. To read and write this value type, wrap it in a property of type string with suitable getters and setters.

Decimal data type is paramount in every business application. We don't want to use "hacks" and convert it to/from string manually every time.

Support for formatting is also crucial (number of decimal places, decimal and thousandth separators)

[floreseken]

I can confirm this.

[Andrzej-W]

I have just found that @Daddoon is working on this (dotnet/blazor#630) and it is almost ready. Thank you @Daddoon.

[Daddoon]

Coming back on that in few days (as stated in dotnet/blazor#630 , i was working on some Xamarin/Blazor interop stuff).
I must update the test case project.

[codeinstinct]

Is there a work around available for this until the issue gets resolved ?

I have a value 0.00008900 which when I bind to a text box, gets represented as 8.9E-05.
It should be represented as "0.00008900" itself and not the scientific notation.

What is the best way to do this in blazor today?

[Andrzej-W]

Partially related issue (formatting for numbers): #9435

[chrdlx]

Hi! What is the current recommended way to bind decimal objects?
I've found myself using inputs only with string properties to then cast manually each property to the datatype and format I need. So basically I have 2 classes, one with all strings (for the text inputs), and another with appropriate data types.

Is this how it's supposed to be used?

Thanks & Regards!!

[SteveSandersonMS]

@rynowak This is fixed now, right? (As of preview 8, I mean)

[rynowak]

No, we did not add support for formatting for numeric types. Only dates support formatting.

[SteveSandersonMS]

Oh, I thought decimal etc would now be bindable due to a built-in typeconverter. I know that doesn't make it have custom formatting though.

[rynowak]

We have bespoke support for decimal.

[ghost]

For a one-way binding scenario, what is the equivalent to @Html.DisplayFor(x => x.SomeProperty) where SomeProperty has the DisplayFormat attribute? E.g. I want to format a number to 3 decimal places (and not issue .ToString("N3") in the razor code.

[SteveSandersonMS]

There's no built-in library support for formatting based on a [DataFormat] attribute. It's technically possible that we or a third party could implement a helper that looks like DisplayWithFormat(() => yourObject.SomeProperty), but it's not something we're currently planning.

[ghost]

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[ghost]

Thanks for contacting us.

We're moving this issue to the .NET 9 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
If we later determine, that the issue has no community involvement, or it's very rare and low-impact issue, we will close it - so that the team can focus on more important and high impact issues.
To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.

[lewing]

Is #60112 sufficient to resolve this?

[vertonghenb]

Is #60112 sufficient to resolve this?

Not yet, some issues are arising here:
#60112 (comment)