小编use*_*403的帖子

我有一个表单,当我从ComboBox中选择一个列名,并在文本框中键入它时,它会过滤并在DataGridView中显示搜索的条件.当我搜索"引用"时,它是一个int数据类型,也是标识和主键.我收到错误消息:

"无法在System.Int32和System.String上执行'Like'操作."

我的代码是

DataTable dt;
private void searchForm_Load(object sender, EventArgs e)
{
    SqlCeConnection con = new SqlCeConnection(@"Data Source=|DataDirectory|\LWADataBase.sdf;");
    SqlCeDataAdapter sda = new SqlCeDataAdapter("select * from customersTBL", con);
    dt = new DataTable();
    sda.Fill(dt);
    dataGridView1.DataSource = dt;
    comboSearch.Items.Add("[Reference]");
    comboSearch.Items.Add("[First Name]");
    comboSearch.Items.Add("[Surename]");
    comboSearch.Items.Add("[Address Line 1]");
    comboSearch.Items.Add("[Address Line 2]");
    comboSearch.Items.Add("[County]");
    comboSearch.Items.Add("[Post Code]");
    comboSearch.Items.Add("[Contact Number]");
    comboSearch.Items.Add("[Email Address]");


}


private void searchTxt_TextChanged(object sender, EventArgs e)
{
    if (comboSearch.SelectedItem == null)
    {
        searchTxt.ReadOnly = true;
        MessageBox.Show("Please select a search criteria");
    }



    else
    {
        searchTxt.ReadOnly = false;
        DataView …