Pass parameter to Partial View in ASP.NET Core

Question

On an ASP.NET Core 2.0 application I need to render a partial view and pass a few parameters:

@Html.Partial("Form", new { File = "file.pdf" })

On the partial view I tried to access it using:

@Model.File

And I get the error:

RuntimeBinderException: 'object' does not contain a definition for 'File'

If I simply use on my partial:

@Model

I get the following printed on the page:

{ File = file.pdf }

So there the model is being passed and there is a property File in it.

So what am I missing?

Should be the same situation that here: stackoverflow.com/questions/223713/… — DaniCE
– DaniCE, Commented Sep 7, 2017 at 16:05

Win · Accepted Answer · 2017-09-07 16:24:41Z

30

You are passing untyped (anonymous type) data to partial view. You cannot use @Model.File. Instead, you will need to use ViewData's Eval method to retrieve the value.

@ViewData.Eval("File")

Traditional approach is to create a strongly typed ViewModel class, and pass it to the partial view. Then you can access it as @Model.File.

public class SampleViewModel
{
    public string File { get; set; }
}

@Html.Partial("Form", new SampleViewModel { File = "file.pdf" })

Inside Partial View,

@model SampleViewModel

<h1>@Model.File</h1>

edited Sep 7, 2017 at 16:24

answered Sep 7, 2017 at 16:06

Win

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2 Comments

Miguel Moura Over a year ago

Yes, I am going for the classic Model approach although not sure why the dynamic approach does not work without the ViewData.Eval

Win Over a year ago

Strongly typed model is stored inside ViewData's Model. In contrast, untyped data is stored inside ViewData's Dictionary. It is why we need to use ViewData.Eval when retrieving data from ViewData's Dictionary.

Ricardo Peres · Accepted Answer · 2017-09-07 16:10:57Z

6

You should have dynamic as the model of your partial view, this way, you can pass everything - like your anonymous object - and it will just work. Add:

@model dynamic

To the Form.cshtml file.

answered Sep 7, 2017 at 16:10

Ricardo Peres

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4 Comments

Miguel Moura Over a year ago

I tried that and I still get the same error: RuntimeBinderException: 'object' does not contain a definition for 'File'

Ricardo Peres Over a year ago

Then you're doing something wrong, as this is the standard way to do it. If you only need to pass the File property, why not pass that directly, e.g., @Html.Partial("Form", (object)"File.pdf") and access it directly in Model?

Neville Nazerane Over a year ago

dynamic is used in a slightly different way. The object passed in is still of type object. Dynamic simply means that it would evaluate the type of the object in run-time. In run-time, the object will still be taken as type object.

Ricardo Peres Over a year ago

That's not true. If you pass an anonymous object, it will be an anonymous object, and by wrapping it in a dynamic, you will be able to access its properties. The views created by the VS templates use dynamic just for that purpose.

Alex from Jitbit · Accepted Answer · 2022-04-17 13:57:28Z

4

For the sake of completeness: you can pass arbitrary variable via a ViewDictionary

@Html.Partial("_Partial", model, new ViewDataDictionary(ViewData) { { "MyVarName", someValue } })

And then access it like this in the partial:

ViewData["MyVarName"]

Another option, you can simply set a ViewData var before calling the partial, and it will be passed on to it

@{
    ViewData["MyVarName"] = "hello";
}
@Html.Partial("_Partial", model)

However, strongly typed models are much easier to work with.

edited Apr 17, 2022 at 13:57

answered Apr 17, 2022 at 13:49

Alex from Jitbit

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Comments

Neville Nazerane · Accepted Answer · 2017-09-07 23:01:15Z

When you do new { File = "file.pdf" }, you are passing an object that contains an attribute file. Since this is of type object, you can't access any of its variables in c# directly. There some ugly codes to access a fields from an object such as the one that can be found here: C# .NET CORE how to get the value of a custom attribute?

However in this case the most recommended way (for safety) is the create a class and pass an object of that class.

So if you create the following class:

public class MyFileInfo{
    public string File { get; set }
}

Then you can create your object by passing:

@Html.Partial("Form", new MyFileInfo{ File = "file.pdf" })

In your partial view, at the beginning, define your model class

@model MyFileInfo

Then in the same file you will now be able to access

@Model.File

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