Hi, I am having a custom entity as Employee. En each record of the Employee entity, I have notes as attachments.
So, I want to download all the attachments of all the entity records. While downloading, I want to rename the filename of the attachments as "Employee Record name" + "Attachment name".
Say, I have a Employee record as Surya. The employee record Surya has an attachment named submission.txt .
So, While getting downloaded in a specified path, it should be renamed as Surya - Submission.txt (as per the business requirement).
So, I have created a field named new_downloadflag (two options field). By default it is set as No.
While it is set as Yes, I have created a pre-validation plugin on Update of the Employee entity and all the Employee entity records's all attachments should be downloaded in a specified path.
So,I have written the plugin and I have used for-each loop to get all the records of the employee's attachments to fetch all those in a specified local drive folder.
My plugin code is given below:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Threading.Tasks;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Client;
using System.ServiceModel;
using Microsoft.Xrm.Sdk.Query;
using System.ComponentModel.DataAnnotations;
namespace Microsoft.Crm.Sdk.Samples
{
[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
public class DownloadAttachment : IPlugin
{
//Guid _annotationId;
//Guid empid;
//EntityReference obj = new EntityReference();
String NoteText;
String recordid;
bool downflagg;
String documentbody;
//String resultname;
public void Execute(IServiceProvider serviceprovider)
{
try
{
IPluginExecutionContext context = (IPluginExecutionContext)serviceprovider.GetService(typeof(IPluginExecutionContext)); // context is the place where all the fields and columnset is present with all the values
IOrganizationServiceFactory factory = (IOrganizationServiceFactory)serviceprovider.GetService(typeof(IOrganizationServiceFactory));
IOrganizationService service = (IOrganizationService)factory.CreateOrganizationService(context.UserId);
if (context.Depth > 1) // to avoid infinite loop
return;
if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)
{
Entity entity = (Entity)context.InputParameters["Target"];
if (entity.LogicalName != "new_employee")
return;
//download flag field
if (entity.Attributes.Contains("new_downloadflag"))
{
downflagg = (bool)entity.Attributes["new_downloadflag"];
}
var downflag = entity.GetAttributeValue<bool?>("new_downloadflag").GetValueOrDefault();
if (downflag == true) //Code will run only when this flag is true or yes
{
QueryExpression emplo = new QueryExpression(); //Getting records which have status as active
emplo.EntityName = "new_employee";
emplo.ColumnSet = new ColumnSet(true);
emplo.Criteria.AddCondition(new ConditionExpression
{
AttributeName = "statecode",
Operator = ConditionOperator.Equal,
Values = { 0 }
});
EntityCollection encol = service.RetrieveMultiple(emplo); //retrieve them and save it as entity collection
if (encol.Entities.Count > 0) //To check the Employee entity has atleast one record
{
foreach (var xy in encol.Entities) //Fetching the records one by one using foreach loop's attributes
{
if (xy.Attributes.Contains("new_name"))
{
recordid = (string)xy.Attributes["new_name"];
}
Guid emprecid = xy.Id; // record's id
QueryExpression qe = new QueryExpression();
qe.EntityName = "annotation";
qe.ColumnSet = new ColumnSet(true);
qe.Criteria.AddCondition(new ConditionExpression // to check the condition this expression has been used here
{
AttributeName = "objectid", //lookup name
Operator = ConditionOperator.Equal,
Values = { emprecid }
});
EntityCollection ec = service.RetrieveMultiple(qe);
foreach (Entity output in ec.Entities)
{
if (output.Attributes.Contains("filename"))
{
NoteText = (string)output.Attributes["filename"];
}
if (output.Attributes.Contains("documentbody"))
{
documentbody = (string)output.Attributes["documentbody"];
}
byte[] fileContent = Convert.FromBase64String(output.Attributes["documentbody"].ToString());
using (FileStream file = new FileStream(@"D:\" + recordid + NoteText + ".txt", FileMode.Create))
{
using (BinaryWriter writer = new BinaryWriter(file))
{
writer.Write(fileContent,0,fileContent.Length);
writer.Close();
}
file.Close();
}
//using (FileStream fileStream = new FileStream(@"D:\" + recordid + NoteText + ".txt", FileMode.OpenOrCreate))
//{
// byte[] fileContent = Convert.FromBase64String(output.Attributes["documentbody"].ToString());
// fileStream.Write(fileContent, 0, fileContent.Length);
// //Response.OutputStream.Write(fileContent , 0, fileContent .Length);
//}
//string outputFileName = @"C:\temp\recordid.txt";
//string noteBody = "gdgsdgdsgsdgsdgs";
//if (!string.IsNullOrEmpty(noteBody))
//{
// // Download the attachment in the current execution folder.
// byte[] fileContent = Convert.FromBase64String(noteBody);
// System.IO.File.WriteAllBytes(outputFileName, fileContent);
//}
//else
//{
// throw new InvalidPluginExecutionException("File content is empty or cannot be retrieved");
//}
//Entity notentity = (Entity)context.InputParameters["Target"];
//TextWriter tw = new StreamWriter(@"D:\" + recordid + NoteText + ".txt",true);
//tw.WriteLine("The next line!");
//tw.Close();
//System.IO.File.WriteAllText(@"D:\" + recordid + NoteText + ".txt", "");
}
}
}
}
}
}
catch (Exception ex)
{
throw ex;
}
}
}
}
Now, When i tried to debug or see the results, I have got this error as
Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
Let me know where I am wrong or what should be done.!
Need your suggestions!
Thanks!