Passing parameter value (sometimes get null value) into stored procedure

Question

0.00/5 (No votes)

See more:

i want to pass parameter value sometimes get null value into stored procedure,my stored procuder look like this

SQL

USE [Stock]
GO
ALTER Proc [dbo].[Add_ItemQte]
@ID_Item int,
@ID_Supplier int,
@Qantity_ItemQte int,
@Date_ItemQte date,
@Lenght_ItemQte int,
@Widht_ItemQte int,
@WightT_ItemQte float,
@ID_Location int,
@ID_Project int=null
AS
INSERT INTO ItemQuantity
       ([ID_Item]
       ,[ID_Supplier]
       ,[Qantity_ItemQte]
       ,[Date_ItemQte]
       ,[Lenght_ItemQte]
       ,[Widht_ItemQte]
       ,[WightT_ItemQte]
       ,[ID_Location]
       ,[ID_Project])
 VALUES
       (@ID_Item
       ,@ID_Supplier
       ,@Qantity_ItemQte
       ,@Date_ItemQte
       ,@Lenght_ItemQte
       ,@Widht_ItemQte
       ,@WightT_ItemQte
       ,@ID_Location
       ,@ID_Project)

my c# code look like this

C#

public void Add_ItemQte(int Name, int Supplier, int Qantity, DateTime Date, int Lenght,int Widht,double WightT,int Location, Nullable<int> Project)
{
    DAL.DataAccessLayer DAL = new DAL.DataAccessLayer();
    DAL.Open();
    SqlParameter[] param = new SqlParameter[9];

    param[0] = new SqlParameter("@ID_Item", SqlDbType.Int);
    param[0].Value = Name;

    param[1] = new SqlParameter("@ID_Supplier", SqlDbType.Int);
    param[1].Value = Supplier;

    param[2] = new SqlParameter("@Qantity_ItemQte", SqlDbType.Int);
    param[2].Value = Qantity;

    param[3] = new SqlParameter("@Date_ItemQte", SqlDbType.Date);
    param[3].Value = Date;

    param[4] = new SqlParameter("@Lenght_ItemQte", SqlDbType.Int);
    param[4].Value = Lenght;

    param[5] = new SqlParameter("@Widht_ItemQte", SqlDbType.Int);
    param[5].Value = Widht;

    param[6] = new SqlParameter("@WightT_ItemQte", SqlDbType.Float);
    param[6].Value = WightT;

    param[7] = new SqlParameter("@ID_Location", SqlDbType.Int);
    param[7].Value = Location;

    param[8] = new SqlParameter("@ID_Project", SqlDbType.Int);
    param[8].Value = Project;

    DAL.ExcuteCommande("Add_ItemQte", param);
    DAL.Close();

}

and i use this code to save my data

C#

for (int i=0;i<gridView1.RowCount;i++)
            {
                prd.Add_ItemQte(Convert.ToInt32(gridView1.GetRowCellValue(i, "IDNom")), Convert.ToInt32(gridView1.GetRowCellValue(i, "IDFournisseur")),
                Convert.ToInt32(gridView1.GetRowCellValue(i, "Quantité")), Convert.ToDateTime(gridView1.GetRowCellValue(i, "Date")),
                Convert.ToInt32(gridView1.GetRowCellValue(i, "Longueur")), Convert.ToInt32(gridView1.GetRowCellValue(i, "Largeur")),
                Convert.ToDouble(gridView1.GetRowCellValue(i, "Poids Total")), Convert.ToInt32(gridView1.GetRowCellValue(i, "IDLocalisation")),
                Convert.ToInt32(gridView1.GetRowCellValue(i, "IDProjet")));

            }

when IDProjet column have a value the code run without error but when it does not contain any value i get this error:Object cannot be cast from DBNull to other types.I do not want to save 0 if the value is null because i will do some filtering depending on that column, how i can solve this problem,thanks in advance.

What I have tried:

i try to use Nullable<int> but did not work for me

Posted 3-May-18 22:57pm

Mahfoud Bouabdallah

Updated 4-May-18 0:04am

Add a Solution

Comments

GKP1992 4-May-18 5:38am

Try casting Project to object type and before assigning to the param value.
Better yet, try this

param[8].Value = (object)(Project ?? DBNull.Value);

Mahfoud Bouabdallah 4-May-18 5:42am

I tried but I got the same error:Object cannot be cast from DBNull to other types

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Mahfoud Bouabdallah · Accepted Answer · 2018-05-04T00:05:00

I get help from Steve and this is the solution

C#

for (int i=0;i<gridView1.RowCount;i++)
{
    object value = gridView1.GetRowCellValue(i, "IDProjet");
    int? prjID = null;
if(value != null && Int32.TryParse(value.ToString(), out int temp))
    prjID = temp;

    prd.Add_ItemQte(...., prjID);
}

C#

param[8] = new SqlParameter("@ID_Project", SqlDbType.Int);
param[8].Value = Project.HasValue ? Project : (object)DbNull.Value;