How to return json result true when exist and false when not exist

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I working on mvc asp.net csharp i need to make function return json result when branch code exist then return true and if not exist return false so can you help me do this function return json result true or false

What I have tried:

httpget

public JsonResult CheckExist(string BranchCode)
{
 string branches = _db.Branch.Single(x => x.iBranchCode == BranchCode).iBranchCode.ToString();
// so what i write here to return true or false
}

Posted 5-Jun-23 2:17am

ahmed_sa

Updated 5-Jun-23 3:38am

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Richard Deeming · Answer 1 · 2023-06-05T03:38:00

Quote:
... when branch code exist then return true and if not exist return false ...

C#
string branches = _db.Branch.Single(x => x.iBranchCode == BranchCode).iBranchCode.ToString();

If the branch doesn't exist, the Single method will throw an InvalidOperationException:
Enumerable.Single Method (System.Linq) | Microsoft Learn[^]

Instead, use Any to test whether there is a branch that meets your condition:
Enumerable.Any Method (System.Linq) | Microsoft Learn[^]

C#

public JsonResult CheckExist(string BranchCode)
{
    bool branchExists = _db.Branch.Any(x => x.iBranchCode == BranchCode);
    return Json(branchExists);
}

OriginalGriff · Answer 2 · 2023-06-05T02:32:00

Solution 1

The JSON for true is a string containing the word "true".
I think you can guess what the JSON for false is.

If necessary, you can wrap this in a class: "value:true" that gives you a bool property:

public class Root
    {
    public bool value { get; set; }
    }

Posted 5-Jun-23 2:32am

OriginalGriff