i want to get data from controller to view can you help me-CodePudding

   public JsonResult GetItemCode(string Code)
        {
            double Category = objFatchXEntities.ItemCardUAE.Single(s => s.Code == Code).Price;
            
            return Json(Category, JsonRequestBehavior.AllowGet);
                }

Error CS0266 Cannot implicitly convert type 'double?' to 'double'. An explicit conversion exists (are you missing a cast?)

CodePudding user response：

It is because your query returns double?. You can change type for Category but better to use var

var category = objFatchXEntities.....
 return Json(category, JsonRequestBehavior.AllowGet);

but it is always better idea to check for null

var category = objFatchXEntities.ItemCardUAE.FirstOrDefault(s => s.Code == Code);

if (category == null || category.Price==null) return null;

 return Json(category.Price, JsonRequestBehavior.AllowGet);

CodePudding user response：

You declared a double variable, it expects a double not a nullable double. You could either get the value of the double? so you have matching types like this

double Category = objFatchXEntities.ItemCardUAE.Single(s => s.Code == Code).Price.Value;

But the problem with this is that you get a NullReference error if price is null at any point. You could just check if Price has a value before doing anything like this

if (objFatchXEntities.ItemCardUAE.Single(s => s.Code == Code).Price.HasValue)
{
    ... do something 
}