A Guide to Different Ways of Passing Data to Partial Views in .NET Core
Partial views are a cornerstone feature in ASP.NET MVC, offering a powerful mechanism for encapsulating and reusing components within your web applications. One common challenge developers face is dynamically passing data to these partial views to enhance their flexibility. In this blog post, we'll delve into various methods for achieving this in ASP.NET Core.
Method 1: Using Partial Tag Helper
The Partial Tag Helper, introduced in ASP.NET Core 2.1 and later, provides a streamlined approach to passing data to partial views. In the parent view, create your data items and seamlessly pass them to the partial view as a model.
<div class="col-12 mb-3">
@{
string[] menuItems = { "Home", "About", "Services", "Contact" };
}
<partial name="~/Views/Shared/Partials/_Breadcrumb.cshtml" model="menuItems" />
</div>In the corresponding partial view "_Breadcrumb.cshtml," render the data with ease.
@model string[]
<nav aria-label="breadcrumb">
<ol class="breadcrumb">
@foreach (var item in Model)
{
<li class="breadcrumb-item">
<a href="~/@item">@item</a>
</li>
}
</ol>
</nav>Method 2: Using Asynchronous HTML Helper with ViewData
Leverage ViewData to pass data to partial views. Set the ViewData in the parent view and use Html.PartialAsync to render the partial view asynchronously.
<div class="col-12 mb-3">
@{
ViewData["PageName"] = "Services";
}
@await Html.PartialAsync("../Shared/Partials/_PageName", ViewData["PageName"])
</div>Access the ViewData object in the partial view "_PageName.cshtml."
<h3>
Page Name : @ViewData["PageName"]
</h3>Method 3: Using Asynchronous HTML Helper with ViewBag
Alternatively, employ ViewBag to pass data to partial views. Though less type-safe, ViewBag is a quick solution for simpler scenarios.
<div class="col-12 mb-3">
@{
ViewBag.Title = "Home";
}
@await Html.PartialAsync("../Shared/Partials/_PageTitle")
</div>In the partial view "_PageTitle.cshtml," access the ViewBag object.
<h3>
Page Title : @ViewBag.Title
</h3>Method 4: Using Asynchronous HTML Helper with Model
For scenarios involving multiple parameters, consider creating a model class to encapsulate the data. In the parent view, instantiate the model and populate its properties.
<div class="col-12 mb-3">
@{
var model = new UserModel
{
FirstName = "John",
LastName = "Doe",
Email = "john-doe-@email.com"
};
}
@await Html.PartialAsync("../Shared/Partials/_ModelData", model)
</div>In the partial view "_ModelData.cshtml," specify the model type and access its properties.
@model UserModel
<ul class="list-group">
<li class="list-group-item">First Name: <strong> @Model.FirstName</strong></li>
<li class="list-group-item">Last Name: <strong>@Model.LastName</strong></li>
<li class="list-group-item">Email: <strong>@Model.Email</strong></li>
</ul>Mastering the art of passing data to partial views in ASP.NET Core opens up a world of possibilities for creating dynamic and reusable components within your web applications. Whether you opt for the simplicity of Partial Tag Helper, the versatility of ViewData and ViewBag, or the structure of a dedicated model, these techniques provide you with the tools to build robust and flexible MVC applications.
Choose the method that best fits your project's requirements and elevate your development experience in ASP.NET Core.
Abdoulie Kassama
Software Engineer with 10+ years experience in full-stack development and enterprise system integration. Specializes in .NET Core, Laravel, and Vue.js, currently architecting critical ERP integrations at London School of Hygiene & Tropical Medicine. Focused on creating efficient solutions that drive digital transformation and operational excellence.
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