Develop Reference

C# and email: HREF to a file attached/embedded in the mail itself

I'm implementing some code in C# to send emails in HTML format. I need to be able to embedded images and links to a document which is attached to the mail itself.
I had no big issues with the images. I create an AlternateView, create a LinkedResource for each image, replace the image src with a CID, then add each LinkedResource to the view and that's it. It works, no big deal.
Simplified, something like this:
private void EmbedImage(AlternateView htmlView, string imageFile)
{
LinkedResource inline = new LinkedResource(imageFile, MediaTypeNames.Image.Jpeg);
_htmlView.LinkedResources.Add(inline);
_body.Replace("ImagePlaceholderTag " + imageFile, "cid:" + inline.ContentId);
}
The problem happens if I try to do something similar with a PDF.
Let's say I have a document conditions.pdf. What I need to do is to attach the document to the email and then have an href in the body of the mail that will open the document when clicked.
I can do this easily on a standard HTML page, obviously, so I've tried to apply the same logic I've used for the images with the only difference being:
I use MediaTypeNames.Application.Pdf.
Instead of using the cid: for the src of an img I use it for the href of an <a> tag.
Result: I get a link in the mail, but when I click it the browser tries to open the cid file.
What should I do to obtain the behavior I need?

Displaying images from database using c# .net

recently, I've been developing a website with .NET c# and I've been trying to display images via the imagepath in the db. It is currently working by this line of code.
return File(byte array, "image/jpeg");
The problem is that by this line of code the layout page is completely ignored as only the image with white background is shown. I need to display the image along with the return view (the image inside the layout of the website). thx

The reason you're not seeing anything is because you can only have one type of response per request; Either a response containing HTML or a response containing the image.
What you need to do in order to serve images via your application is set up a route that you can put in your <img> tags as the src attribute.
<img src="/static/images/123">
Your route would listen for requests on the /static/images/ path and then try to parse the ID number at the end. It could then take that ID number (123) and look up the relevant image in your database.
So, to be clear, you'd have at least two requests that occur; First, you serve the request for the page, then you serve subsequent requests for the image(s). These two request handlers do not share the same code.
Finally, if you really wanted to "inline" an image as part of the page response, The only way you can "inline" an image into a page is to base64 encode it and set that as as the src of an <img> tag. This process is slow and bloats your HTML, making it take longer to load.

HTML Reference to Image in RAM/Memory

I want to render a html-page with the C#-Webbrowser Form.
Normally I receive the html file from another application. For simplicity I just read the html page from the hard drive into a stream and then I set the webBrowserControl to this content.
That works in general. But now I want the html file to reference to images in the imageList.
I don't want to save the images to the hard drive.
Is there any possibilty to reference images in RAM with HTML.
The common way like
<img src="C:\\pic.png"/>
is obviously not possible.
Explanation Code
Image image = Image.FromFile(src_pathfile); //normally from another application over interface
List<Image> imageList = new List<Image>();
imageList.Add(image);
Stream source = File.OpenRead("C:\\Webpage.html"); //from another application
webBrowser.DocumentStream = source;
Thank you for your help in advance.
magicbasti

You can encode the image as base-64 and store it in the <img> tag itself. There's some information about it here.

I draw diagrams, but I see old image on the new page

I am developing a C# web project. I run it on the local web server.
I draw. I show image as follows:
bitmap.Save(Server.MapPath("diagram.jpg"), ImageFormat.Jpeg);
Image1.ImageUrl = ResolveUrl("diagram.jpg");
I don't see new image. Only old one, which I had after changing image name
(Say, I change diagram.jpg to diagram2.jpg).
Browser is Firefox.
The design page in C# is simple. Just Image and few TextBoxes on the page.
No UpdatePanel and such.
Something with caching... But how to fight with that...

But how to fight with that.
Always use a separate path / name. Pug a GUID somewhere. Simple like that. Different file can not be cached.

I'm not sure what ResolveUrl does, but try adding a querystring to the image url so that the page always gets a "fresh" file. Something like this:
Image1.ImageUrl = ResolveUrl(string.Format("diagram.jpg?v={0}", Guid.NewGuid()));

You can alternative write the image file as
diagram.jpg?ver=2
to keep the same image file, but force the browser to update it.

If Image has Same name and URL browser picks the image from the cache and displays the same for faster loading of the pages.
Even if you change the image server side the same cached image is displayed until you clear the cache of the browser. You can use query string to change image url like below.
Image1.ImageUrl = ResolveUrl("diagram.jpg?" + DateTime.Now.Ticks.ToString());

HttpWebRequest reades only homepage

Hi I tried to read a page using HttpWebRequest like this
string lcUrl = "http://www.greatandhra.com";
HttpWebRequest loHttp = (HttpWebRequest)WebRequest.Create(lcUrl);
loHttp.Timeout = 10000; // 10 secs
loHttp.UserAgent = "Code Sample Web Client";
HttpWebResponse loWebResponse = (HttpWebResponse)loHttp.GetResponse();
Encoding enc = Encoding.GetEncoding(1252); // Windows default Code Page
StreamReader loResponseStream =
new StreamReader(loWebResponse.GetResponseStream(), enc);
string lcHtml = loResponseStream.ReadToEnd();
mydiv.InnerHtml = lcHtml;
// Response.Write(lcHtml);
loWebResponse.Close();
loResponseStream.Close();
i can able to read that page and bind it to mydiv. But when i click on any one of links in that div it is not displaying any result. Because my application doesnt contain entire site. So what we will do now.
Can somebody copy my code and test it plz
Nagu

I'm fairly sure you can't insert a full page in a DIV without breaking something. In fact the whole head tag may be getting skipped altogether (and any javascript code there may not be run). Considering what you seem to want to do, I suggest you use an IFRAME with a dynamic src, which will also hopefully lift some pressure off your server (which wouldn't be in charge of fetching the html to be mirrored anymore).

If you really want a whole page of HTML embedded in another, then the IFRAME tag is probably the one to use, rather than the DIV.
Rather than having to create a web request and have all that code to retrieve the remote page, you can just set the src attribute of the IFRAME to point ot the page you want it to display.
For example, something like this in markup:
<iframe src="<%=LcUrl %>" frameborder="0"></iframe>
where LcUrl is a property on your code-behind page, that exposes your string lcUrl from your sample.
Alternatively, you could make the IFRAME runat="server" and set its src property programatically (or even inject the innerHTML in a way sismilar to your code sample if you really wanted to).

The code you are putting inside .InnerHtml of the div contains the entire page (including < html >, < body >, < /html > and < /body> ) which can cause a miriad of problems with any number of browsers.
I would either move to an iframe, or consider some sort of parsing the HTML for the remote site and displaying a transformed version (ie. strip the HTML ,BODY, META tags, replace some link URLs, etc).

But when i click on any one of links in that div it is not displaying any result
Probably because the links in the download page are relative... If you just copy the HTML into a DIV in your page, the browser considers the links relative to the current URL : it doesn't know about the origin of this content. I think the solution is to parse the downloaded HTML, and convert relative URLs in href attributes to absolute URLs

If you want to embed it, you need to strip everything but the body part. That means that you have to parse your string lcHTML for <body....> and remove everything before and includeing the body tag. You must also strip away everything from </body>. Then you need to parse the string for all occurences of <a href="....."> that do not start with http:// and include h t t p://www.greatandhra.com or set <base target="h t t p://www.greatandhra.com"> in your head section.
If you don't want to embed, simply clear the response buffer and stream the lcHTML string back to the browser.
PS: I had to write all h t t p with spaces to be able to post this.

Sounds like what you are trying to do is display a different site embedded in your site. For this to work by dropping it into a div you would have to extract the code between the body tags as it wouldn't be valid with html and head in the middle of another page.
The links won't work because you've now taken that page out of context in your site so you'd also have to rewrite any links on the page that are relative (i.e. don't start with http) to point to a page on your site which will then fetch the other sites page and display them back in your site, or you could add the url of the site you're grabbing to the beginning of all the relative links so they link back to that site.