C# 如何在 DataView 中使用多个 RowFilter

Question

I'd like to know how can I filter data based on multiple user's input in different textbox or combobox. It works but only the latest input. How can I link them together?

    private void text_Sname_TextChanged(object sender, EventArgs e)
    {
        DataView dv = new DataView(dt);                      
        dv.RowFilter = string.Format ("[Supplier Name] LIKE '%{0}%'", text_Sname.Text);
        dataGridView1.DataSource = dv;            
    }

    private void text_Pnumber_TextChanged(object sender, EventArgs e)
    {
        DataView dv = new DataView(dt);
        dv.RowFilter = string.Format("[Part Number] LIKE '%{0}%'", text_Pnumber.Text);
        dataGridView1.DataSource = dv;
    }

    private void text_Dwgnumber_TextChanged(object sender, EventArgs e)
    {
        DataView dv = new DataView(dt);
        dv.RowFilter = string.Format("[Drawing Number] LIKE '%{0}%'", text_Dwgnumber.Text);
        dataGridView1.DataSource = dv;
    }

Any answer will be appreciated!

Answer 1

You can save your filter in a variable like this:

string m_currentFilter=string.Empty;
string m_partNumberFilter=string.Empty;
string m_drawingNumberFilter=string.Empty;

then write a method like

 private void applyFilter()
{
    generateFilter(m_drawingNumberFilter);
    generateFilter(m_partNumberFilter);
}

private void generateFilter(string filter)
{
  if(!string.IsNullOrEmpty(filter))
  {
   if(string.IsNullOrEmpty(m_currentFilter))
    {
      m_currentFilter=filter;
    }else
    {
       m_currentFilter+= " AND " + filter;
    }
   }
 }

Then you will use it like this:

    private void text_Pnumber_TextChanged(object sender, EventArgs e)
        {
            DataView dv = new DataView(dt);
            m_partNumberFilter=string.Format("[Part Number] LIKE '%{0}%'", text_Pnumber.Text);
            applyFilter();
            dv.RowFilter = m_currentFilter;
            dataGridView1.DataSource = dv;
        }

private void text_Dwgnumber_TextChanged(object sender, EventArgs e)
    {
        DataView dv = new DataView(dt);
       m_drawingNumberFilter= string.Format("[Drawing Number] LIKE '%{0}%'", text_Dwgnumber.Text);
        applyFilter();
        dv.RowFilter = m_currentFilter;
        dataGridView1.DataSource = dv;
    }

This should only be an inspiration how you can do that, it's not porposed for using in production :-)