internal string BuildCacheKey(string prefix)
{
var segments = new List <object> {
prefix
};
if (VaryBy == null)
{
return(string.Join("_", segments));
}
segments.AddRange(VaryBy.Flatten());
return(string.Join("_", segments));
}
/// <inheritdoc />
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (output == null)
{
throw new ArgumentNullException(nameof(output));
}
IHtmlContent content;
if (Enabled)
{
var cacheContext = new CacheContext(CacheId);
if (!String.IsNullOrEmpty(VaryBy))
{
cacheContext.AddContext(VaryBy.Split(SplitChars, StringSplitOptions.RemoveEmptyEntries));
}
if (!String.IsNullOrEmpty(Dependencies))
{
cacheContext.AddTag(Dependencies.Split(SplitChars, StringSplitOptions.RemoveEmptyEntries));
}
var hasEvictionCriteria = false;
if (ExpiresOn.HasValue)
{
hasEvictionCriteria = true;
cacheContext.WithExpiryOn(ExpiresOn.Value);
}
if (ExpiresAfter.HasValue)
{
hasEvictionCriteria = true;
cacheContext.WithExpiryAfter(ExpiresAfter.Value);
}
if (ExpiresSliding.HasValue)
{
hasEvictionCriteria = true;
cacheContext.WithExpirySliding(ExpiresSliding.Value);
}
if (!hasEvictionCriteria)
{
cacheContext.WithExpirySliding(DefaultExpiration);
}
_cacheScopeManager.EnterScope(cacheContext);
try
{
content = await output.GetChildContentAsync();
}
finally
{
_cacheScopeManager.ExitScope();
}
content = await ProcessContentAsync(output, cacheContext);
}
else
{
content = await output.GetChildContentAsync();
}
// Clear the contents of the "cache" element since we don't want to render it.
output.SuppressOutput();
output.Content.SetHtmlContent(content);
}
