将DateTimePicker值传递给存储过程C＃

Question

我有DataGridView和DateTimePicker ，我想基于DateTimePicker值在DataGridView显示数据。

这是存储过程：

create proc Get_Employers_All_Day
    @Date_Day date
as 

SELECT 
    [Employer_ID] as 'رقم الموظف'
    , Employer_Name as 'اسم الموظف'
FROM [dbo].[Come_Out]
inner join Employers 
    on Employers .Epmloyer_ID = Come_Out .Employer_ID 
where 
    Come_Out .Status = '2'
     and Come_Out .Data_Come_Out = @Date_Day 

这是C＃代码：

public void Get_Employers_All_Day(DateTime Date_Day)
{

    DAL.DataAccessLayer DAL = new DAL.DataAccessLayer();
    DAL.Open();

    SqlParameter[] param = new SqlParameter[1];
    param[0] = new SqlParameter("@Date_Day", SqlDbType.DateTime);
    param[0].Value = Date_Day;

    DAL.ExecuteCommand("Get_Employers_All_Day", param);
    DAL.Close();

}

和事件：

private void Frm_Daily_Come_Out_Load(object sender, EventArgs e)
{
    BL.Employers emp = new BL.Employers();
    dataGridView1.DataSource = emp.Get_Employers_All_Day(dateTimePicker1 .Value );
}

错误是：

无法将类型“ void”隐式转换为“ object”

Answer 1

您的Get_Employers_All_Day()方法的返回类型为void ，这意味着它没有返回类型。

对其进行修改以返回所需的数据。 例如，如果您的DAL.ExecuteCommand()返回一个DataTable ，请对其进行修改以返回它：

public DataTable Get_Employers_All_Day(DateTime Date_Day)
{
    ...
    ...

    DataTable result;
    try
    {
        result = DAL.ExecuteCommand("Get_Employers_All_Day", param);
    }
    finally
    {
        // Even if ExecuteCommand() fails, close any open connections
        DAL.Close();
    }

    return result;
}