11

我有一个表单,当我从 ComboBox 中选择列名并在文本框中键入时,它会过滤并在 DataGridView 中显示搜索条件。当我搜索“引用”时,它是一个 int 数据类型,也是身份和主键。我收到错误消息:

“无法对 System.Int32 和 System.String 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 dv = new DataView(dt);
        dv.RowFilter = "" + comboSearch.Text.Trim() + "like '%" + searchTxt.Text.Trim() + "%'";
        dataGridView1.DataSource = dv;

    }
}
4

3 回答 3

17

Convert the number to a string inside the filter:

dv.RowFilter = string.Format("CONVERT({0}, System.String) like '%{1}%'",
                             comboSearch.Text.Trim(), searchTxt.Text.Trim());
于 2014-03-11T14:30:19.187 回答
0

也许试试这个?

dv.RowFilter = "'%" + comboSearch.Text.Trim() + "%' like '%" + searchTxt.Text.Trim() + "%'";

它可能只是缺少引用,因为查询读取为

"   123 like '%123%'   "
于 2014-03-11T14:27:51.313 回答
-1

该代码试图从gridview(devexpress)搜索..

   DataRow[] dr = dt.Select("invoiceId ='" + Convert.ToInt32(gridView1.GetRowCellValue(id, "invoiceId")) + "' AND  '%" + Convert.ToDouble(gridView1.GetRowCellValue(id, "Amount_Paid")) + "%' LIKE   '%" + Convert.ToDouble(gridView1.GetRowCellValue(id, "Amount")) + "%' ");

                    if (dr.Length > 0)
                    {
                        MessageBox.Show("already paid");
                    }
于 2016-10-15T18:25:59.033 回答