Bootstrap for ASP.NET MVC - Second Edition

Creating a Bootstrap Alert Tag Helper

To create a Bootstrap Alert Tag Helper, which will be a little bit more advanced than the previous example, follow these steps:

1. Create a new class called BootstrapAlertTagHelper in the TagHelpers folder.
2. Change the class to inherit from TagHelper.
3. Add a Boolean property called Dismissable and a string property called Color to the class:

            public bool Dismissable { get; set; } 
           public string Color { get; set; } 
   

4. Next, override the ProcessAsync method, as illustrated here:

            public override async Task ProcessAsync(TagHelperContext context,        TagHelperOutput output)        {        output.TagName = "div";        output.Attributes.Add("class","alert alert-" + Color);        output.Attributes.Add("role", ...