SQL错误必须声明标量变量

Question

        private void FillInvoiceList()
    {
        DataTable distinctInvoice = new DataTable();
        using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["APOS_CONNECTION_STRING"].ConnectionString))
        {
            conn.Open();
            SqlCommand cmd = new SqlCommand("Select distinct svc_tag from data where rep_name = @value");
            cmd.Parameters.AddWithValue("@value", this.DropDownList1.SelectedItem.Text);
            SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmd.CommandText, conn.ConnectionString);
            sqlDataAdapter.Fill(distinctInvoice);
        }
        foreach (DataRow row in distinctInvoice.Rows)
        {
            this.ListBox1.Items.Add(row["svc_tag_dim_invoice_num"].ToString());
        }
    }

我有这个代码,当我调用Fill(DistinctInvoice)时出现此错误

必须声明标量变量"@value"

我的FillInvoiceList()方法是从DropDownList1的SelectedIndexChanged事件中调用的.DropDownList1.SelectedItem.Text的值似乎是正确的.

谢谢你的帮助.

Answer 1

错误在这里:

SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmd.CommandText, conn.ConnectionString);

您正在设置SQLDataAdapter以使用原始CommandText,而不是SQLCommand本身.将其更改为:

SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmd, conn.ConnectionString);