How to debug C# code using Visual Studio Code

Question

I am a newbie to VS Code environment. I am developing a Web API in VS Code which would later be consumed from client application. Following code block does not seem to be executing so I want to check whether it is at all hitting!

//GET: pwapi/plants/10076/features
[HttpGet("{id}, {sectionArray}")]
public async Task<string> Get(int id, string sectionArray){
  var url="https://www.domain.com/search?apikey=<apikey>&sections="+sectionArray+"&plantid="+id;
			
  using(var client = new HttpClient()){
    client.BaseAddress=new Uri(url);
    client.DefaultRequestHeaders.Accept.Clear();
    var response=await client.GetAsync(url);
				
    //will throw an exception if not successful
    response.EnsureSuccessStatusCode();
				
    string content = await response.Content.ReadAsStringAsync();
				
    //return await Task.Run(() => JsonObject.Parse(content));
    return content;
  }
}

URL for the above method is http://localhost:5000/pwapi/plants/10076/features

I have the overloaded method which is working fine:

[HttpGet("{id}")]
public async Task<string> Get(int id){
  var url="https://www.domain.com/list?apikey=<apikey>";
  using(var client = new HttpClient()){
    client.BaseAddress=new Uri(url);
    client.DefaultRequestHeaders.Accept.Clear();
    var response=await client.GetAsync(url);
				
    //will throw an exception if not successful
    response.EnsureSuccessStatusCode();
				
    string content = await response.Content.ReadAsStringAsync();
				
    //return await Task.Run(() => JsonObject.Parse(content));
    return content;
  }
}

URL for the above method is http://localhost:5000/pwapi/plants/10076

Three questions: 1. How I can debug the code? 2. If debug is not possible (so far I have seen that debug is possible for client scripts only, I may be wrong), what is the alternative way to know where I am doing wrong? 3. If there is no alternative, please tell me why the method is not hitting.

which version of webapi you are using? Did you defined a route for multiple parameters? When you look for the endpoint in browser do you get a 404 response code? and also you need to append api in front of you api controllers. Please let me know. I think appending API infront of pwapi should should solve the issue. — qamar
– qamar, Commented Dec 28, 2015 at 5:38
not sure about webapi version. I am developing in asp.net 5 using dnx. there is no typical 404, but a blank screen is appearing. http://localhost:5000/pwapi/plants/10076 works fine without appending anything but http://localhost:5000/pwapi/plants/10076/features doesn't. "Did you defined a route for multiple parameters" - how can I do this? I am a newbie! :) — Subrata Sarkar
– Subrata Sarkar, Commented Dec 28, 2015 at 5:52
why there is a comma in your route prefix? [HttpGet("{id}, {sectionArray}")] Try using [HttpGet("{id}/{sectionArray}")] — qamar
– qamar, Commented Dec 28, 2015 at 5:55
solution worked perfectly! Thanks a lot! however I would still like to know about debugging c# in VS code. And here is the route [Route("pwapi/[controller]")]. — Subrata Sarkar
– Subrata Sarkar, Commented Dec 28, 2015 at 6:02

Stafford Williams · Accepted Answer · 2015-12-28 08:28:05Z

2

If you notice your route prefix for Get overload you have a comma instead of a slash, which makes the route invalid therefore your endpoint never gets hit. Please change the route prefix to this:

[HttpGet("{id}/{sectionArray}")]

As for debugging the endpoint you just need to put a break point by either pressing F9 on the line or by clicking on the left of the line of code that you want to debug.

edited Dec 28, 2015 at 8:28

Stafford Williams

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answered Dec 28, 2015 at 6:05

qamar

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7 Comments

Subrata Sarkar Over a year ago

Yes, as for debugging I already used the steps you mentioned above. This creates an empty launch.json but it needs additional configurations to set in order to initiate the debugging process. Where I can get the configurations?

qamar Over a year ago

can I see the content of launch.json file? If you need to attach to some process that will be "w3wp.exe" for asp.net hosted sites/apis

Subrata Sarkar Over a year ago

I updated VS Code. Now launch.json has something in it. However, "program" node is set to "ConsoleApplication.exe" but mine is a Web API.

qamar Over a year ago

Instead of consileapplicatikn.exe use w3wp.exe

Subrata Sarkar Over a year ago

request 'launch': program 'd:\Projects\aspnet\apiservice\w3wp.exe' does not exist. Do I have to install debugger using locally for this project? If yes how? I have asp.net 5 installed already. Won't VS Code use it from GAC?

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