System.Security.SecurityException: That assembly does not allow partially trusted callers while using HttpUtility.UrlEncode in CRM


We got the below error in one of our Sandboxed Plugins

“System.Security.SecurityException: That assembly does not allow partially trusted callers”.

We realised it was because of using System.Web.HttpUtility class

We replaced it with EscapeDataString method and this fixed the issue.


Helpful thread

Hope it helps..

LINQ: GroupBy, Sum and EntityCollection in CRM

Just sharing a sample code that could be used for group by and sum operation on EntityCollection.

Suppose below is the output that we want

We can use the below code for that.

// select categoryid, final forecast, final awards from SubCategory Entity
// category id is lookup in SubCategory Entity

EntityCollection result = orgProxy.RetrieveMultiple(new FetchExpression(fetch));

var details = from r in result.Entities.AsEnumerable()
group r by new
groupByCategoryID = ((EntityReference)r.Attributes["categoryId"]).Id.ToString()
into g
select new
sumFinalForecast = g.Sum(x => Convert.ToInt32(x.Attributes["finalforecast"])),
sumFinalAwards = g.Sum(x => Convert.ToInt32(x.Attributes["finalawards"])),
categoryId = g.Key.groupByCategoryID

// update the parent record
foreach(var detail in details)
Entity entityUpdate = new Entity("category");
entityUpdate.Id = new Guid(detail.categoryId);
entityUpdate.Attributes["totalfinalforecast"] = detail.sumFinalForecast;
entityUpdate.Attributes["totalfinalawards"] = detail.sumFinalAwards;

Hope it helps..

Missing Action (message) in Plugin Registration Tool

Recently we created a new created Action and it twas not showing up in Plugin Registration Tool.

Closing and restarting the Plugin Registration tool fixed it.

Hope it helps..

Using ILMerge for Plugin in CRM

If we make use of external assembly in our Plugin (sandboxed) we will get the exception of FileNotFound.

So here we can make use of ILMerge which basically merges the assembly referenced and the plugin into a single assembly.

Install the following NuGet Package.

This adds the following files in our Plugin project.

We need to set Copy Local as true for all our referenced assembly that we want to merge with our plugin.

We need to set Copy Local as false for all other assemblies that we do not want to be merged with plugin.

Just build the project and we are done.

The assembly inside Reflector: –

Hope it helps.

Using WebClient to call external service from CRM Online Sandboxed Plugin (HTTP POST and JSON)

Sharing a sample code that can be used to send JSON data using POST to an external service inside CRM Online Plugin. As plugin runs in sandbox mode we cannot reference Newtonsoft’s JSON.NET library The other option could be to use ILMerge, which isn’t that elegant.

Here, basically we are passing some information related to lead to an external service on Post Create of it.

using Microsoft.Xrm.Sdk;
using System;
using System.IO;
using System.Net;
using System.Runtime.Serialization.Json;
using System.Text;

namespace MyTestPlugin

 public class Lead
 public string Topic { get; set; }
 public string FullName { get; set; }
 public string Email { get; set; }

 public class MyPluginClass : IPlugin
 public void Execute(IServiceProvider serviceProvider)
 // Obtain the execution context from the service provider.
 IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));

 // The InputParameters collection contains all the data passed in the message request.
 if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)
 // Obtain the target entity from the input parameters.
 Entity entity = (Entity)context.InputParameters["Target"];

 using (WebClient client = new WebClient())
 var myLead = new Lead();
 myLead.Topic = entity.Attributes["subject"].ToString();
 myLead.FullName = entity.Attributes["fullname"].ToString();
 myLead.Email = entity.Attributes["emailaddress1"].ToString();

 DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(Lead));
 MemoryStream memoryStream = new MemoryStream();
 serializer.WriteObject(memoryStream, myLead);
 var jsonObject = Encoding.Default.GetString(memoryStream.ToArray());

 var webClient = new WebClient();
 webClient.Headers[HttpRequestHeader.ContentType] = "application/json";
 var code = "key";
 var serviceUrl = "" + code;

 // upload the data using Post mehtod
 string response = webClient.UploadString(serviceUrl, jsonObject);
 catch (Exception ex)
 throw new InvalidPluginExecutionException(ex.Message);

Hope it helps..

Add hyperlink (and button) in Form Notification in Dynamics 365 (CRM 2016 and earlier)

Recently we were working on a requirement wherein we wanted to add a hyperlink to the Notification that we were showing on the form.

For this we can use the following Jscript library

The JScript code:


Clicking on Details opens the page specified in the callback function.

The other option is to show hyperlink within a web resource and putting it inside the form.

Hope it helps..