Consider the use of TextWriter async methods for the HTML Helpers, for example the WriteInitializationScript methods. In certain scenarios the use of the synchronous methods causes an exception: System.InvalidOperationException: Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead.
This can be resolved by explicitly enabling synchronous operations
services.Configure<IISServerOptions>(options =>
{
options.AllowSynchronousIO = true;
});
though synchronous operations have been disabled by default at framework level as of .NET 3.0.
Currently, the Content function for Steps in a Wizard only accepts a string value (see API here).
This means that in order to add a partial view (bound to the current model and its properties), the most straightforward way I could find was to put the partial view (and any wrappers) in its own file and add an extension method "ToHtmlString()". For example:
@model MyModel
@(Html.Kendo().Wizard().Steps(step => {
step.Add().Content(Html.Partial("~/Path/To/View/Wrapper.cshtml", Model).ToHtmlString());
})
using Microsoft.AspNetCore.Html;
using System.IO;
public static class HtmlContentExtensions
{
public static string ToHtmlString(this IHtmlContent htmlContent)
{
if (htmlContent is HtmlString htmlString)
{
return htmlString.Value;
}
using StringWriter writer = new();
htmlContent.WriteTo(writer, System.Text.Encodings.Web.HtmlEncoder.Default);
return writer.ToString();
}
}
@model MyModel
@(Html.Kendo().TabStrip().Items(tabstrip => {
tabstrip.Add()
.Content(@<div id="@Model.TabContainer" class="myTabWrapperClass">
@await Html.PartialAsync("~/Path/To/View.cshtml", Model)
</div>);
})