Return DropDownList 为 NULL 时的所有数据

Return ALL data when DropDownList is NULL

我正在尝试修复我犯的一些错误和错误,但我没有及时注意。

我有两个下拉菜单(Statusbit)和(OrgUnitId int 0-9)。

所以问题是当用户 select 在这两个下拉列表中只有一个记录,而另一个下拉列表不是 select 默认情况下 return 0

但在我的示例中,我想修改它并创建如果用户 select 仅 Status = 1 它应该 return 记录状态为 1 的位置和 OrgUnit 它应该 return 所有数据未经过滤。

到目前为止,我为从数据库中捕获 StatusOrgUnitId 编写了这些代码,并在 DropDownMenu

中显示
public void FillOrgUnit()
{
    using (SqlConnection conn = new SqlConnection(@"Data Source=(LocalDb)\MSSQLLocalDB;Initial Catalog=DesignSaoOsig1;Integrated Security=True"))
    {
        string com = "SELECT DISTINCT OrgUnitID FROM tblZaposleni_AD ORDER BY OrgUnitID ASC";
        SqlDataAdapter adpt = new SqlDataAdapter(com, conn);
        DataTable dt = new DataTable();
        adpt.Fill(dt);
        ddlOrgUnit.DataSource = dt;
        ddlOrgUnit.DataTextField = "OrgUnitID";
        ddlOrgUnit.DataValueField = "OrgUnitID";
        ddlOrgUnit.DataBind();
        ddlOrgUnit.Items.Insert(0, new ListItem("-- Izaberi Org Jedinicu --", "NULL"));
    }
}

public void FillStatus()
{
    using (SqlConnection conn = new SqlConnection(@"Data Source=(LocalDb)\MSSQLLocalDB;Initial Catalog=DesignSaoOsig1;Integrated Security=True"))
    {
        string com = "SELECT DISTINCT Status FROM tblZaposleni_AD";
        SqlDataAdapter adpt = new SqlDataAdapter(com, conn);
        DataTable dt = new DataTable();
        adpt.Fill(dt);
        ddlStatus.DataSource = dt;
        ddlStatus.DataTextField = "Status";
        ddlStatus.DataValueField = "Status";
        ddlStatus.DataBind();
        ddlStatus.Items.Insert(0, new ListItem("-- Izaberi Status --", "NULL"));
    }
}

这是我过滤数据的主要功能

private void GetReports(XtraReport report)
{
    try
    {
        string connString = @"Data Source=(LocalDb)\MSSQLLocalDB;Initial Catalog=DesignSaoOsig1;Integrated Security=True";
        SqlConnection conn = new SqlConnection(connString);
        string strproc = "TestReport";

        using (SqlDataAdapter sda = new SqlDataAdapter(strproc, connString))
        {
            DataSet ds = new DataSet();

            SqlCommand cmd = new SqlCommand();
            sda.SelectCommand.CommandType = CommandType.StoredProcedure;
            sda.SelectCommand.Parameters.Add("@Status", SqlDbType.Bit).Value = ddlStatus.SelectedValue == "1" ? true : false;
            sda.SelectCommand.Parameters.Add("@OrgJed", SqlDbType.Int).Value = ddlOrgUnit.SelectedValue;
            sda.Fill(ds);

            string[] arrvalues = new string[ds.Tables[0].Rows.Count];

            for (int loopcounter = 0; loopcounter < ds.Tables[0].Rows.Count; loopcounter++)
            {
                //assign dataset values to array
                arrvalues[loopcounter] = ds.Tables[0].Rows[loopcounter]["PrezimeIme"].ToString();
                arrvalues[loopcounter] = ds.Tables[0].Rows[loopcounter]["NetworkLogin"].ToString();
                arrvalues[loopcounter] = ds.Tables[0].Rows[loopcounter]["Status"].ToString();
                arrvalues[loopcounter] = ds.Tables[0].Rows[loopcounter]["OrgUnitID"].ToString();
            }

            report.DataSource = ds;
            report.DataMember = ds.Tables[0].TableName.ToString();
        }
    }
    catch (Exception)
    {
        throw;
    }
}

为了更好地理解我想要什么以及问题出在哪里,我编写了这个存储过程:

DECLARE @Status bit = 1,
        @OrgJed int 
BEGIN
    SELECT PrezimeIme, NetworkLogin, Status, OrgUnitId, DT_Creat, DT_Modif
    FROM [DesignSaoOsig1].[dbo].[tblZaposleni_AD]
    WHERE (@Status IS NULL OR Status = @Status) 
      AND (@OrgJed IS NULL OR OrgUnitID = @OrgJed)
END

下面是这个存储过程的结果:

这是我在视图中得到的结果

It looks to me like when the ALL option is selected, that you are setting the parameter values to the string "NULL", rather than DBNull.Value.

尝试替换这个:

    sda.SelectCommand.Parameters.Add("@Status", SqlDbType.Bit).Value = ddlStatus.SelectedValue == "1" ? true : false;
    sda.SelectCommand.Parameters.Add("@OrgJed", SqlDbType.Int).Value = ddlOrgUnit.SelectedValue;

有了这个:

if (ddlStatus.SelectedValue == "NULL")
   sda.SelectCommand.Parameters.Add("@Status", SqlDbType.Bit).Value = DBNull.Value;
else
   sda.SelectCommand.Parameters.Add("@Status", SqlDbType.Bit).Value = ddlStatus.SelectedValue == "1" ? true : false;


if (ddlOrgUnit.SelectedValue == "NULL")
     sda.SelectCommand.Parameters.Add("@OrgJed", SqlDbType.Int).Value = DBNull.Value;
else
    sda.SelectCommand.Parameters.Add("@OrgJed", SqlDbType.Int).Value = ddlOrgUnit.SelectedValue;