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app_pages.cs
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app_pages.cs
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using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Routing;
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using rmp;
using System.Web;
namespace mywebsite
{
/*
==================================================
Illustrates using a instance class to render
website pages.
Note the [routemap] attributes above those methods
used to render pages. See rpm.cs for details.
==================================================
*/
public class app_pages
{
private int m_product_page_render_count;
/*
--------------------------------------------------
Constructor.
--------------------------------------------------
*/
public app_pages()
{
m_product_page_render_count = 0;
}
/*
--------------------------------------------------
Given a StringBuilder, add HTML code for the start
of a page ...
--------------------------------------------------
*/
public void page_start( StringBuilder sb, String title = "Title", Boolean link_to_home = true )
{
String s;
s = HttpUtility.HtmlEncode( title );
sb.AppendLine( $@"<html><head><title>{s}</title></head><body>" );
sb.AppendLine( @"<h1>" );
if ( link_to_home )
{
sb.AppendLine( @"<a href=""/"">Home</a> : " );
}
sb.Append( s );
sb.AppendLine( "</h1>" );
}
/*
--------------------------------------------------
Given a StringBuilder, add HTML code for the end
of a page ...
--------------------------------------------------
*/
public void page_end( StringBuilder sb )
{
sb.AppendLine( $@"<p>{System.DateTime.UtcNow:F}</p>" );
sb.AppendLine( @"</body></html>" );
}
/*
--------------------------------------------------
Render the home page ...
--------------------------------------------------
*/
[routemap( "/" )]
public async Task home_page( HttpContext http_context )
{
StringBuilder sb;
sb = new StringBuilder();
// Build response ...
page_start( sb, "Home", false );
sb.AppendLine(
@"<ul>
<li><a href=""/product/22"">/product/22</a></li>
<li><a href=""/routemaps/"">/routemaps</a></li>
<li><a href=""/static1/"">/static1/</a></li>
<li><a href=""/static2/44"">/static2/44</a></li>
</ul>"
);
page_end( sb );
// Send response ...
http_context.Response.ContentType = "text/html";
await http_context.Response.WriteAsync( sb.ToString() );
return;
}
/*
--------------------------------------------------
Render a product page for a given product ID ...
--------------------------------------------------
*/
[routemap( "/product/{id:int}" )]
public async Task product_page( HttpContext http_context )
{
const String k_product_id = "id";
int product_id;
StringBuilder sb;
sb = new StringBuilder();
// Build response ...
page_start( sb, "Product Page" );
// Show number of times this page has been rendered ...
m_product_page_render_count++;
sb.Append( $@"<p>Render count: {m_product_page_render_count}" );
// Get product ID ...
var route_data = http_context.GetRouteData();
if ( route_data is not null )
{
// Get an individual data value ...
if ( route_data.Values.ContainsKey( k_product_id ) )
{
product_id = Int32.Parse( ( String )route_data.Values[ k_product_id ] );
// Build response ...
sb.AppendLine( $@"<p>Product ID: {product_id}</p>" );
}
}
page_end( sb );
// Send response ...
http_context.Response.ContentType = "text/html";
await http_context.Response.WriteAsync( sb.ToString() );
return;
}
/*
--------------------------------------------------
Render a page that shows endpoint information, and
all defined routemaps ...
--------------------------------------------------
*/
[routemap( "/routemaps" )]
public async Task routemaps_page( HttpContext http_context )
{
String s;
StringBuilder sb;
sb = new StringBuilder();
// Build response ...
page_start( sb, "Routemaps" );
// Show endpoint info ...
var endpoint = http_context.GetEndpoint();
if ( endpoint is not null )
{
sb.AppendLine( $@"<b>This routemap endpoint properties:</b>
<ul>
<li>DisplayName: {endpoint.DisplayName}</li>
<li>RequestDelgate: {endpoint.RequestDelegate.Method.DeclaringType.FullName}.{endpoint.RequestDelegate.Method.Name}</li>
</ul>"
);
}
// Show all defined routemaps ...
var routemap_endpoints = ( routemap_endpoints )http_context.RequestServices.GetService( typeof( routemap_endpoints ) );
sb.AppendLine( $@"<b>Number of [routemap] endpoints defined: {routemap_endpoints.routemaps.Count}</b><ol>" );
foreach ( KeyValuePair<String, routemap_data> kvp in routemap_endpoints.routemaps )
{
s = String.Join( ", ", kvp.Value.routemap_attribute.allowed_http_method_list );
sb.AppendLine( $@"<li>Routemap pattern: {kvp.Value.routemap_attribute.route_pattern}
<ul>
<li>Allowed HTTP methods: {s}</li>
<li>Order: {kvp.Value.routemap_attribute.order}</li>
<li>Mapped to method: {kvp.Value.method_name}</li>
<li>Source file: {kvp.Value.routemap_attribute.file_path}, line: {kvp.Value.routemap_attribute.line_number}</li>
</ul>
<br></li>"
);
}
sb.AppendLine( "</ol>" );
page_end( sb );
// DEBUGGING - Log all routemaps to a text file
// Uncomment and change path below as needed ...
/*
String routemap_file = @"D:\temp\routmap_pages.txt";
try
{
routemap_endpoints.log_to_file( routemap_file );
sb.AppendLine( $@"<b>Routemaps written to file</b>: {routemap_file}</p>" );
}
catch ( Exception ex )
{
sb.AppendLine( $@"<p>{ex}</p>" );
}
*/
// Send response ...
http_context.Response.ContentType = "text/html";
await http_context.Response.WriteAsync( sb.ToString() );
return;
}
}
}