public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
await base.ProcessAsync(context, output);
output.Attributes.RemoveAll("condition");
if (context.TagName.Equals("if", StringComparison.OrdinalIgnoreCase))
{
output.TagName = null;
}
var ctx = ConditionalContext.GetFromContext(context);
var innerContent = await output.GetChildContentAsync();
if (ctx.NeedsElseContent)
{
if (ctx.ElseContent == null)
{
output.SuppressOutput();
}
else
{
output.Content.SetHtmlContent(ctx.ElseContent);
}
}
}
public override void Init(TagHelperContext context)
{
base.Init(context);
var ctx = ConditionalContext.GetFromContext(context);
ctx.NeedsElseContent = ShouldSuppress();
}
public static ConditionalContext GetFromContext(TagHelperContext context)
{
if (!context.Items.TryGetValue(nameof(ConditionalContext), out var ctx))
{
ctx = new ConditionalContext();
context.Items.Add(nameof(ConditionalContext), ctx);
}
return((ConditionalContext)ctx);
}
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
var ctx = ConditionalContext.GetFromContext(context);
if (ctx.NeedsElseContent)
{
ctx.ElseContent = await output.GetChildContentAsync();
}
output.SuppressOutput();
}
