Question

如何在文本框中输入文本时在数据网格视图中显示sql数据。例如：dBase中有wai wai和britannia。我想在product_name中显示数据网格列中数据库的所有信息或者product_id在产品名称中输入：textbox。我尝试了以下代码：但它不起作用：

private void textBox2_KeyDown(object sender, KeyEventArgs e)
{
    if(e.KeyData==Keys.Enter)
    {
        SqlConnection con = new SqlConnection("Data Source=SUMIT;Initial Catalog=Project;Integrated Security=True");
        SqlDataAdapter a = new SqlDataAdapter("select product_Name,product_Id,purchase_Price,discount,beforevat_Price,vat_Rate,actual_Cost,Margin,actual_Sp from Product", con);
        DataTable b = new DataTable();
        a.Fill(b);
        dataGridView1.DataSource = b;
        textBox3.Focus();
    }
}

它显示如下输出：

Answer 1

你实际上可以这样做

string WhrCond = "";
int n;
if(int.TryParse(textBox2.Text, out n))
{
    WhrCond = "product_Id = " + textBox2.Text.Trim() ;
}
else
{
    WhrCond = "product_Name LIKE '%" + textBox2.Text.Trim() + "%'";
}

if(string.IsNullOrEmpty(textBox2.Text))
{
    WhrCond = "1 = 1";
}
SqlConnection con = new SqlConnection("Data Source=SUMIT;Initial Catalog=Project;Integrated Security=True");
SqlDataAdapter a = new SqlDataAdapter("select product_Name as [Product Name],
                        actual_Cost as [Actual Cp], 
                        Margin, 
                        actual_Sp as [Actual SP], 
                        product_Id as [Product Id], 
                        purchase_Price as [Purchase Price], 
                        discount as [Discount], 
                        beforevat_Price as [Before Vat Price],
                        vat_Rate as [Vat%] from Product WHERE " + WhrCond , con);
DataTable b = new DataTable();
a.Fill(b);
dataGridView1.DataSource = b;
textBox3.Focus();

您将从设计时创建的DGV中删除所有数据。

Answer 2

我假设你的datagridview在这里没有设置列（因为我们使用数据源）尝试擦除它们。

 private void textBox2_TextChanged(object sender, EventArgs e)
        {
            SqlConnection conn = new SqlConnection("Data Source=SUMIT;Initial Catalog=Project;Integrated Security=True " + "connection timeout=300");
            conn.Open();

            string query = "Select * from Product where product_Name  like '%"+textBox2.Text+"%'";
            SqlDataAdapter a = new SqlDataAdapter(query,conn);
            DataTable b = new DataTable();
            a.Fill(b);
            dataGridView1.DataSource = b;

        }

PS：如果你绝对想在开始时设置列，那么不要使用DataSource 在数据表b.rows上使用foreach循环，然后将行添加到datagridview1

DtataGridView1.Rows.Add(b["Product_Name],..,...)

2-like lei说你可以使用DataPropertyNametoo

在文本框中输入文本和id时，如何在数据网格视图中显示sql数据

2 个答案: