private void MoveTo(ViewBuffer destination)
{
for (var i = 0; i < Pages.Count; i++)
{
var page = Pages[i];
var destinationPage = destination.Pages.Count == 0 ? null : destination.Pages[destination.Pages.Count - 1];
// If the source page is less or equal to than half full, let's copy it's content to the destination
// page if possible.
var isLessThanHalfFull = 2 * page.Count <= page.Capacity;
if (isLessThanHalfFull &&
destinationPage != null &&
destinationPage.Capacity - destinationPage.Count >= page.Count)
{
// We have room, let's copy the items.
Array.Copy(
sourceArray: page.Buffer,
sourceIndex: 0,
destinationArray: destinationPage.Buffer,
destinationIndex: destinationPage.Count,
length: page.Count);
destinationPage.Count += page.Count;
// Now we can return the source page, and it can be reused in the scope of this request.
Array.Clear(page.Buffer, 0, page.Count);
_bufferScope.ReturnSegment(page.Buffer);
}
else
{
// Otherwise, let's just add the source page to the other buffer.
destination.Pages.Add(page);
}
}
Pages.Clear();
}
private async Task <ViewBufferTextWriter> RenderPageAsync(
TemplatePage page,
PageContext context,
bool invokeViewStarts)
{
var writer = context.Writer as ViewBufferTextWriter;
if (writer == null)
{
Debug.Assert(_bufferScope != null);
// If we get here, this is likely the top-level page (not a partial) - this means
// that context.Writer is wrapping the output stream. We need to buffer, so create a buffered writer.
ViewBuffer buffer = new ViewBuffer(_bufferScope, page.Path, ViewBuffer.ViewPageSize);
writer = new ViewBufferTextWriter(buffer, context.Writer.Encoding, _htmlEncoder, context.Writer);
}
else
{
// This means we're writing something like a partial, where the output needs to be buffered.
// Create a new buffer, but without the ability to flush.
ViewBuffer buffer = new ViewBuffer(_bufferScope, page.Path, ViewBuffer.ViewPageSize);
writer = new ViewBufferTextWriter(buffer, context.Writer.Encoding);
}
// The writer for the body is passed through the ViewContext, allowing things like HtmlHelpers
// and ViewComponents to reference it.
var oldWriter = context.Writer;
var oldFilePath = context.ExecutingFilePath;
context.Writer = writer;
context.ExecutingFilePath = page.Path;
try
{
if (PreRenderCallbacks?.Count > 0)
{
foreach (var callback in PreRenderCallbacks)
{
try
{
callback(page);
}
catch (Exception)
{
//Ignore
}
}
}
if (invokeViewStarts)
{
// Execute view starts using the same context + writer as the page to render.
await RenderViewStartsAsync(context);
}
await RenderPageCoreAsync(page, context);
return(writer);
}
finally
{
context.Writer = oldWriter;
context.ExecutingFilePath = oldFilePath;
}
}
