call Rest web service from plugin c#

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Posted on by Community Member Microsoft Employee

I have created a plugin which get activated when on create record.

And in plugin i am calling a REST api. it run very well in a simple application console

But when i am calling in plugin like below

public string MakeRequest(string parameters)
{
var request = (HttpWebRequest)WebRequest.Create(EndPoint + parameters);

request.Method = Method.ToString(); //get
request.ContentLength = 0;
request.ContentType = ContentType;

using (var response = (HttpWebResponse)request.GetResponse())//*******
{
var responseValue = string.Empty;

if (response.StatusCode != HttpStatusCode.OK)
{
var message = String.Format("Request failed. Received HTTP {0}", response.StatusCode);
throw new ApplicationException(message);
}

// grab the response
using (var responseStream = response.GetResponseStream())
{
if (responseStream != null)
using (var reader = new StreamReader(responseStream))
{
responseValue = reader.ReadToEnd();
}
}

return responseValue;
}
}

But its not running and when i am debugging it comes on //******* it getting stop and my Plugin Registration Tool also get crashed.

If it don't get crash i can get the exception but due to that i am unable to catch the cause.

some one can help me

tnx

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Community Member Microsoft Employee on at

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RE: call Rest web service from plugin c#

Open the plugin registration tool and make sure that the isolation mode in none not sandbox.
Amarsen 55 on at

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RE: call Rest web service from plugin c#

I think this is something you will have to workout with your network security team. Please see below

https://community.dynamics.com/crm/f/117/t/144242 (register plugin outside sandbox)

social.msdn.microsoft.com/.../why-request-for-the-permission-of-type-systemnetwebpermission

blogs.iis.net/.../Enabling-WebPermission-in-Medium-Trust
Community Member Microsoft Employee on at

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RE: call Rest web service from plugin c#

good morning Amarsen

i tried this code and i get yhis error:

Request for the permission of type 'System.Net.WebPermission, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

how can i resolve it !!!!
Community Member Microsoft Employee on at

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RE: call Rest web service from plugin c#

Compare the .net versions between the plugin and console app. Also make sure you aren't using any assemblies that aren't available in the crm environment (my experience is only with CRM online and we have to be careful about the assemblies we use - not sure if this is the case in on-premise).
Amarsen 55 on at

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RE: call Rest web service from plugin c#

You can enable plugin trace log and capture the actual error message thrown by the plugins. This is very useful for tracing issues within plugins and custom workflows in development env. but it effects performance so advise you to disable the tracing as you complete it.

Also, try to use plugin tracing (ITracingService) so that you can exactly see where it is failing.

Try this code

-------------

string returnValue = string.Empty;

HttpWebRequest request;

WebResponse response;

try

{

request = (HttpWebRequest)WebRequest.Create(baseUrl);

request.Timeout = 100000;

byte[] data = Encoding.UTF8.GetBytes(message);

request.Method = Method.ToString();

request.ContentType = ContentType;

Stream dataStream = request.GetRequestStream();

dataStream.Write(data, 0, data.Length);

dataStream.Close();

response = request.GetResponse();

if(response!=null)

{

returnValue = new StreamReader(response.GetResponseStream()).ReadToEnd();

}

}

catch (Exception ex)

{

returnValue = ex.Message;

if (ex is WebException)

{

var webException = new StreamReader(((WebException)ex).Response.GetResponseStream()).ReadToEnd();

returnValue = returnValue + webException;

}

}
Community Member Microsoft Employee on at

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RE: call Rest web service from plugin c#

I do it /run as different user and i set the user cridential crm but i get the some issue ...
Community Member Microsoft Employee on at

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RE: call Rest web service from plugin c#

You won't be able to step through the web service code when debugging the plugin with the PluginRegistration tool (it's a replayer, not a true debugger so it fails when it hits the web service code).

I'm using CRM Online and we've created a custom log entity to log plugin exceptions. Not familiar with onpremise, but can you log the full error information (or exception info)?

Also, what user security context does the plugin run under (double-click the step info to see the "run in user's context" account). In your console app, can you attempt to debug your console app using the same user? You can run Visual Studio as a different user by holding down the shift key and right clicking on the Visual Studio icon, then choose "run as different user".
Community Member Microsoft Employee on at

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RE: call Rest web service from plugin c#

hi Francesco

firstly i use on premise instance of crm and i try to call a external REST web service from this plugin

tnx
Suggested answer

Community Member Microsoft Employee on at

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RE: call Rest web service from plugin c#

Hi ghazi,

please refer to the following page to solve your problem:

https://github.com/jlattimer/CrmWebApiCSharp

Please let me know if you solve.

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Francesco Picchi

Microsoft Dynamics CRM Consultant, Bologna+Milano, ITALY

Independent Contractor

http://www.francescopicchi.com