C# WPF:将 ComboBox 中的项目添加到 Access DB

C# WPF: Add item from ComboBox to Access DB

最近几天我一直在努力解决这个问题。我有一个带有 DO/SEE/EXPECT 的表单,带有 TextBoxes(这有效),但是当我尝试添加一个包含 3 个项目的 ComboBox 时,我总是在 cmd.ExecuteNonQuery() 上收到 OleDbException ;:

An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in System.Data.dll

Additional information: Data type mismatch in criteria expression.

我做错了什么?

using System.Windows;
using System.Data.OleDb;
using System.Configuration;

namespace WpfApplication3
{

    public partial class Records : Window
    {
        public Records()
        {
            InitializeComponent();
        }
    
        private void button_Click(object sender, RoutedEventArgs e)
        {
            OleDbConnection con = new OleDbConnection();
            con.ConnectionString = ConfigurationManager.ConnectionStrings["Connection"].ToString();
            con.Open();
            OleDbCommand cmd = new OleDbCommand();
            cmd.CommandText = "insert into [tblInboxRecords](DO, SEE, EXPECT, Segment) Values (@do,@see,@ex,@sg)";
            cmd.Parameters.AddWithValue("@do", txtdo.Text);
            cmd.Parameters.AddWithValue("@see", txtsee.Text);
            cmd.Parameters.AddWithValue("@ex", txtexpect.Text);
            cmd.Parameters.AddWithValue("@sg", boxsegment.Text); // This is the combobox
            cmd.Connection = con;
            cmd.ExecuteNonQuery();
            {
                MessageBox.Show("Item Inserted");
            }

        }
        
    }
}

这是 ComboBox 的 .xaml:

<ComboBox x:Name="boxsegment" HorizontalAlignment="Left" Height="20" Margin="72,85,0,0" VerticalAlignment="Top" Width="120">
    <ComboBoxItem Content="Type A (Operator)"/>
    <ComboBoxItem Content="Type B (Urgent)"/>
    <ComboBoxItem Content="Type C (Critical)"/>
</ComboBox>

当我寻找解决方案时,我只能找到如何使用您的数据库中的项目到 WPF,而没有找到其他方法。

找到了!

通过使用string SegmentBox = boxsegment.Text.ToString();

而不是cmd.Parameters.AddWithValue("@sg", boxsegment.Text);