行过滤器中的多个参数

Question

我试图在textchanged事件下将文本框作为Rowfilter放置!

下面的代码用于GRID以获取相应的Reg_Number 或 Customer_Name在文本框中输入的代码!

wat的令人惊讶的事实是,这段代码直接采用了第二个论证

(即)
((DataTable)radGridView1.DataSource).DefaultView.RowFilter = "Reg_Number like '%" + radTextBoxControl1.Text + "%'";

试图改变线路,但不管我做了什么,它都会忽略第一个并取得第二个

我试图把AND放在一条线上,但是不行,请告诉我frnzz!

private void radTextBoxControl1_TextChanged(object sender, EventArgs e)
{
    try
    {
        ((DataTable)radGridView1.DataSource).DefaultView.RowFilter =
            "Customer_Name like '%" + radTextBoxControl1.Text + "%'";
        ((DataTable)radGridView1.DataSource).DefaultView.RowFilter =
            "Reg_Number like '%" + radTextBoxControl1.Text + "%'";
    }
    catch (Exception) { }
}

Answer 1

这是因为第二个分配取代了第一个分配

myDataTable.DefaultView.RowFilter = "firstFilter";
myDataTable.DefaultView.RowFilter = "secondFilter";
// Now RowFilter is "secondFilter"

您必须将2个过滤器与逻辑OR组合以获得满足以下两个条件的结果:

myDataTable.DefaultView.RowFilter = "firstFilter OR secondFilter";

var view = ((DataTable)radGridView1.DataSource).DefaultView;
string escapedText = radTextBoxControl1.Text.Replace("'", "''");
view.RowFilter = "Customer_Name LIKE '%" + escapedText + "%' OR " +
                    "Reg_Number LIKE '%" + escapedText + "%'";

它变得更加清晰String.Format:

view.RowFilter = String.Format("Customer_Name LIKE '%{0}%' OR Reg_Number LIKE '%{0}%'",
                               escapedText);

或者,从C#7.0开始,使用字符串插值:

view.RowFilter =
    $"Customer_Name LIKE '%{escapedText}%' OR Reg_Number LIKE '%{escapedText}%'";

另外,请确保用两个单引号替换单引号.这使SQL字符串能够包含引号并防止SQL注入:

SELECT * FROM myTable WHERE Name = 'Andy''s Pub';

究其原因,你必须结合了这两个条件OR,而不是AND是,用户将进入任何一个客户名称或注册号(我们只有一个文本框).

或者,您可以检查条目是否格式化为注册号,并应用适当的过滤器.在伪代码中:

if (radTextBoxControl1.Text is formatted as reg_nr) {
    view.RowFilter = "Reg_Number LIKE '%" + escapedText + "%'";
} else {
    view.RowFilter = "Customer_Name LIKE '%" + escapedText + "%'";
}