public override object Execute(Expression expression)
{
var methodCallExpression = expression as MethodCallExpression;
var elementType = GetElementTypeFromExpression(expression) ?? TypeSystem.GetElementType(expression.Type);
if (!typeof(crmbaseentity).IsAssignableFrom(elementType))
{
throw new NotSupportedException($"Type '{elementType.FullName}' is not supported with GenericRepository<>.");
}
var webapi = _serviceProvider.GetService(typeof(GenericRepository <>).MakeGenericType(elementType));
var genericRepositoryType = webapi.GetType();
var command = Translate(expression, elementType);
try
{
var methodCall = genericRepositoryType.GetMethod("RetrieveMultiple").Invoke(webapi, new object[] { command });
var result = methodCall.GetType().GetProperty("Result").GetGetMethod().Invoke(methodCall, null);
if (methodCallExpression == null)
{
return(result);
}
if (methodCallExpression.Method.Name == "OrderBy" || methodCallExpression.Method.Name == "OrderByDescending")
{
var mc = methodCallExpression;
while (mc != null)
{
if (mc.Arguments.Count == 0)
{
break;
}
mc = mc.Arguments[0] as MethodCallExpression;
if (mc?.Method.Name == "Select")
{
methodCallExpression = mc;
break;
}
}
}
if (methodCallExpression.Method.Name == "Select")
{
var operand = (methodCallExpression.Arguments[1] as UnaryExpression).Operand as LambdaExpression;
if (operand?.ReturnType != elementType)
{
var resultWithLambdaInvoked = (IList)Activator.CreateInstance(typeof(List <>).MakeGenericType(operand.ReturnType));
var fn = operand.Compile();
foreach (var item in (IEnumerable)result)
{
resultWithLambdaInvoked.Add(fn.DynamicInvoke(item));
}
result = resultWithLambdaInvoked;
}
}
return(result);
}
finally
{
genericRepositoryType.GetMethod("Dispose").Invoke(webapi, null);
}
}
