public static string GenerateEmailContent(this XrmService xrmService, string emailTemplateResourceName, string emailTemplateTargetType, Guid emailTemplateTargetId, string crmurl = null, string appendAppIdToCrmUrl = null)
{
string activityDescription = null;
var targetTokens = new List <string>();
var staticTokens = new Dictionary <string, List <string> >();
var ifTokens = new List <string>();
var staticIdentifier = "STATIC|";
var ifIdentifier = "IF|";
var endifIdentifier = "ENDIF";
if (emailTemplateResourceName != null)
{
var resource = xrmService.GetFirst(Entities.webresource, Fields.webresource_.name, emailTemplateResourceName);
if (resource == null)
{
throw new NullReferenceException(string.Format("Could Not Find {0} With {1} '{2}'", xrmService.GetEntityLabel(Entities.webresource), xrmService.GetFieldLabel(Fields.webresource_.name, Entities.webresource), emailTemplateResourceName));
}
var encoded = resource.GetStringField(Fields.webresource_.content);
byte[] binary = Convert.FromBase64String(encoded);
activityDescription = UnicodeEncoding.UTF8.GetString(binary);
if (appendAppIdToCrmUrl != null)
{
var baseUrlPart = "crminstanceurl]/main.aspx?";
activityDescription = activityDescription.Replace(baseUrlPart, baseUrlPart + "appid=" + appendAppIdToCrmUrl + "&");
}
//parse out all tokens inside [] chars to replace in the email
var i = 0;
while (i < activityDescription.Length)
{
if (activityDescription[i] == '[')
{
var startIndex = i;
while (i < activityDescription.Length)
{
if (activityDescription[i] == ']')
{
var endIndex = i;
var token = activityDescription.Substring(startIndex + 1, endIndex - startIndex - 1);
if (token.ToUpper().StartsWith(ifIdentifier) || token.ToUpper().StartsWith(endifIdentifier))
{
ifTokens.Add(token);
}
else if (token.ToUpper().StartsWith(staticIdentifier))
{
token = token.Substring(staticIdentifier.Length);
var split = token.Split('.');
if (split.Count() != 2)
{
throw new Exception(string.Format("The static token {0} is not formatted as expected. It should be of the form type.field", token));
}
var staticType = split.First();
var staticField = split.ElementAt(1);
if (!staticTokens.ContainsKey(staticType))
{
staticTokens.Add(staticType, new List <string>());
}
staticTokens[staticType].Add(staticField);
}
else
{
targetTokens.Add(token);
}
break;
}
i++;
}
}
else
{
i++;
}
}
}
//query to get all the fields for replacing tokens
var query = xrmService.BuildSourceQuery(emailTemplateTargetType, targetTokens);
query.Criteria.AddCondition(new ConditionExpression(xrmService.GetPrimaryKeyField(emailTemplateTargetType), ConditionOperator.Equal, emailTemplateTargetId));
var targetObject = xrmService.RetrieveFirst(query);
//process all the ifs (clear where not)
while (ifTokens.Any())
{
var endIfTokenStackCount = 0;
var removeAll = false;
var token = ifTokens.First();
if (token.ToUpper() != endifIdentifier)
{
var tokenIndex = activityDescription.IndexOf(token);
var indexOf = token.IndexOf("|");
if (indexOf > -1)
{
var field = token.Substring(indexOf + 1);
var fieldValue = targetObject.GetFieldValue(field);
var endIfTokenStack = 1;
var remainingTokens = ifTokens.Skip(1).ToList();
while (true && remainingTokens.Any())
{
if (remainingTokens.First().ToUpper() == endifIdentifier)
{
endIfTokenStack--;
endIfTokenStackCount++;
}
else
{
endIfTokenStack++;
}
remainingTokens.RemoveAt(0);
if (endIfTokenStack == 0)
{
break;
}
}
//okay so starting at the current index need to find the end if
//and remove the content or the tokens
var currentStack = endIfTokenStackCount;
var currentIndex = activityDescription.IndexOf(token);
while (currentStack > 0)
{
var endIfIndex = activityDescription.IndexOf(endifIdentifier, currentIndex, StringComparison.OrdinalIgnoreCase);
if (endIfIndex > -1)
{
currentIndex = endIfIndex;
currentStack--;
}
else
{
break;
}
}
removeAll = fieldValue == null;
if (removeAll)
{
var startRemove = tokenIndex - 1;
var endRemove = currentIndex + endifIdentifier.Length + 1;
activityDescription = activityDescription.Substring(0, startRemove) + activityDescription.Substring(endRemove);
}
else
{
var startRemove = tokenIndex - 1;
var endRemove = currentIndex - 1;
activityDescription = activityDescription.Substring(0, startRemove)
+ activityDescription.Substring(startRemove + token.Length + 2, endRemove - startRemove - token.Length - 2)
+ activityDescription.Substring(endRemove + endifIdentifier.Length + 2);
}
}
}
ifTokens.RemoveRange(0, endIfTokenStackCount > 0 ? endIfTokenStackCount * 2 : 1);
}
//replace all the tokens
foreach (var token in targetTokens)
{
var sourceType = emailTemplateTargetType;
string displayString = xrmService.GetDisplayString(targetObject, token, isHtml: true);
activityDescription = activityDescription.Replace("[" + token + "]", displayString);
}
foreach (var staticTargetTokens in staticTokens)
{
var staticType = staticTargetTokens.Key;
var staticFields = staticTargetTokens.Value;
//query to get all the fields for replacing tokens
var staticQuery = xrmService.BuildSourceQuery(staticType, staticFields);
var staticTarget = xrmService.RetrieveFirst(staticQuery);
//replace all the tokens
foreach (var staticField in staticFields)
{
string staticFunc = null;
activityDescription = activityDescription.Replace("[STATIC|" + string.Format("{0}.{1}", staticType, staticField) + "]", xrmService.GetFieldAsDisplayString(staticType, staticField, staticTarget.GetFieldValue(staticField), isHtml: true, func: staticFunc));
}
}
return(activityDescription);
}