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Asp.net check if imageURL exists

I am trying to get a user's thumbnail from another intranet site, but some of them do not match the predefined format, which means that I want to download the default thumbnail.

What is the best way to check if the image URL is valid?

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4 answers

Depending on how you get the images, this may change.

<html> <body> <img src="<dynamic handler url>" alt="My Username" onError="this.src='defaultProfile.jpg';" /> </body> </html>

Here's how you do it in ASP.NET.

Designer -

 <asp:Image ImageUrl="NonexistentImage.Jpg" ID="profileImage" Height="50" Width="50" runat=server />

Code for (C #)

 profileImage.Attributes["onerror"] = "this.src='http://www.cs.uofs.edu/~olivetoj2/blah.jpg';";

This works great for me.

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 WebRequest webRequest = WebRequest.Create(url); WebResponse webResponse; try { webResponse = webRequest.GetResponse(); } catch //If exception thrown then couldn't get response from address { return 0; } return 1;
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You can easily achieve this in jQuery.

 $("#myImage") .load(function() { alert("it loaded ok") }) .error(function() { $(this).attr("src", alternateImage) });
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From code verification

 File.Exists(Server.MapPath("file path"))

If it returns true, set the value, otherwise set the default thumbnail.

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Source: https://habr.com/ru/post/916984/

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