In this article I will explain with an example, how to use Static files (Images, CSS and JS files) in ASP.Net Core MVC (.Net Core 3).
Static files such as Image files, CSS files and JavaScript JS files does not work in ASP.Net Core unless it is placed at proper location with the necessary settings.
Note: For beginners in ASP.Net Core (.Net Core 3), please refer my article ASP.Net Core 3: Hello World Tutorial with Sample Program example.
 
 

Static Files Location

The Static Files are stored inside the wwwroot Folder (Directory).
.Net Core 3: Static Files (Images, CSS and JS files) in ASP.Net Core
 
 

Stylecss.css

body
{
    font-family: Arial;
    font-size: 10pt;
}
 
table
{
    border: 1px solid #ccc;
    border-collapse: collapse;
}
 
table th
{
    background-color: #F7F7F7;
    color: #333;
    font-weight: bold;
}
 
table th, table td
{
    padding: 5px;
    border: 1px solid #ccc;
}
 
#img
{
    height: 80px;
    width: 80px;
}
 

JavaScript.js

Inside the ShowName JavaScript function, the File Name entered in the TextBox is fetched as set to the src property of Image element and image is displayed.
function ShowName() {
    var name = document.getElementById("txtName").value;
    var img = document.getElementById("img");
    img.src = "/images/" + name + ".png";
    img.alt = name;
    document.getElementById("trImage").style.display = "table-row";
};
 
 

Allowing access to Static Files in ASP.Net Core

Inside the Startup.cs class, the UseStaticFiles method of IApplicationBuilder interface is called which makes Static files accessible in ASP.Net Core.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    app.UseStaticFiles();
}
 
 

Controller

The Controller consists of following Action method.

Action method for handling GET operation

Inside this Action method, simply the View is returned.
public class HomeController : Controller
{
    public IActionResult Index()
    {
        return View();
    }
}
 
 

View

HTML Markup

Inside the View first the CSS and JS files are inherited inside the HEAD tag.
The View consists of an HTML Table which consists of following elements:
TextBox – For capturing Image file name.
 
Button – For calling ShowName JavaScript function.
The Button has been assigned with an onclick JavaScript function.
When the Button is clicked, the ShowName JavaScript function (discussed later) is called.
 
Img – For displaying Image.
@{
    Layout = null;
}
 
<!DOCTYPE html>
 
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <link href="~/CSS/Stylecss.css" rel="stylesheet"/>
    <script src="~/Scripts/JavaScript.js"></script>
</head>
<body>
    <table>
        <tr>
            <td>Name</td>
            <td><input type="text" id="txtName" /></td>
        </tr>
        <tr>
            <td></td>
            <td><input type="button" id="btnSubmit" value="Submit" onclick="ShowName();" /></td>
        </tr>
        <tr id="trImage" style="display:none">
            <td colspan="2" align="center"><img id="img" alt="" /></td>
        </tr>
    </table>
</body>
</html>
 
 

Screenshot

.Net Core 3: Static Files (Images, CSS and JS files) in ASP.Net Core
 
 

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