无法对 System.Int32 和 System.String 执行“Like"操作.DataGridView 搜索和过滤 [英] Cannot perform 'Like' operation on System.Int32 and System.String. DataGridView search and filter

问题描述

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Reference"时，它是一个 int 数据类型，它也是身份和主键.我收到错误消息:

<块引用><块引用>

无法对 System.Int32 和 System.String 执行‘Like’操作."

我的代码是

DataTable dt;private void searchForm_Load(对象发送者，EventArgs e){SqlCeConnection con = new SqlCeConnection(@"Data Source=|DataDirectory|LWADataBase.sdf;");SqlCeDataAdapter sda = new SqlCeDataAdapter("select * from customersTBL", con);dt = 新数据表()；sda.Fill(dt);dataGridView1.DataSource = dt;comboSearch.Items.Add("[参考]");comboSearch.Items.Add("[名字]");comboSearch.Items.Add("[姓氏]");comboSearch.Items.Add("[地址行 1]");comboSearch.Items.Add("[地址行 2]");comboSearch.Items.Add("[县]");comboSearch.Items.Add("[邮政编码]");comboSearch.Items.Add("[联系电话]");comboSearch.Items.Add("[电子邮件地址]");}private void searchTxt_TextChanged(对象发送者，EventArgs e){if (comboSearch.SelectedItem == null){searchTxt.ReadOnly = true;MessageBox.Show("请选择一个搜索条件");}别的{searchTxt.ReadOnly = false;数据视图 dv = 新数据视图 (dt);dv.RowFilter = "" + comboSearch.Text.Trim() + "like '%" + searchTxt.Text.Trim() + "%'";dataGridView1.DataSource = dv;}}

解决方案

将数字转换为过滤器内的字符串:

dv.RowFilter = string.Format("CONVERT({0}, System.String) like '%{1}%'",comboSearch.Text.Trim(), searchTxt.Text.Trim());

I have a form that when I select a column name from a ComboBox, and type in a text box it filters and displays the searched criteria in the DataGridView. When I search for "Reference" which is an int data type, which is also identity, and primary key. I get the error message :

"Cannot perform 'Like' operation on System.Int32 and System.String."

My code is

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;

    }
}

解决方案

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());

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