Question

有一个名为cartkey的表。它有一列cartkey。我在文本框中输入cartkey，然后单击按钮，我希望整个行对着private void btncartdesign_Click(object sender, EventArgs e) { { SqlConnection sql = new SqlConnection("Data Source=75.119.176.76;Initial Catalog=virtual-11;Persist Security Info=True;User ID=sa;Password=kornit932"); sql.Open(); DataTable dt = new DataTable(); SqlDataAdapter sd = new SqlDataAdapter("select * from CartdesignSizes where cartkey=@txtcartkey", sql); SqlCommand cmd = new SqlCommand("select * from CartdesignSizes where CartKey=@txtcartkey", sql); cmd.Parameters.AddWithValue("@txtcartkey", txtcartkey.Text); cmd.ExecuteNonQuery(); sd.Fill(dt); dataGridView.DataSource = cmd.tables[0]; sql.Close(); label2.Visible = true; label2.Text = dataGridView.Rows.Count.ToString(); } }，我想在数据网格视图中显示该行。

以下是代码：

DataView DV = new DataView(dbdataset);
            DV.RowFilter=String.Format("CartKey LIKE '{0}'",txtcartkey.Text);
            dataGridView.DataSource = DV;

文本框后面的代码：

  <security-constraint>
    <web-resource-collection>
        <web-resource-name>private</web-resource-name>
        <url-pattern>/private/*</url-pattern>
        <http-method>OPTIONS</http-method>
        <http-method>DELETE</http-method>
        <http-method>GET</http-method>
        <http-method>POST</http-method>
        <http-method>PUT</http-method>
    </web-resource-collection>
    <auth-constraint>
        <role-name>
            AppAdmins
        </role-name>
        <role-name>
            AppUsers
        </role-name>
    </auth-constraint>
</security-constraint>

<security-role>
    <role-name>AppAdmins</role-name>
</security-role>
<security-role>
    <role-name>AppUsers</role-name>
</security-role>

Answer 1

您应该更改此行（我无法看到您如何编译它，因为SqlCommand没有表属性

dataGridView.DataSource = cmd.tables[0];

到

dataGridView.DataSource = dt;

但是，应该更改代码以删除一些无用的代码重复，并引入using语句以更好地处理此查询中涉及的对象的处置

private void btncartdesign_Click(object sender, EventArgs e)
{
    string sqlText = @"select * from CartdesignSizes 
                       where cartkey=@txtcartkey";
    DataTable dt = new DataTable();
    using(SqlConnection sql = new SqlConnection(.....))
    using(SqlDataAdapter sd = new SqlDataAdapter(sqlText, sql))
    {
        sd.SelectCommand.Parameters.Add("@txtcartkey", 
                      SqlDbType.NVarChar).Value = txtcartkey.Text;
        sd.Fill(dt);
        dataGridView.DataSource = dt;
        label2.Visible = true;
        label2.Text = dataGridView.Rows.Count.ToString();
    }
}

通过这种方式，所涉及的两个一次性物体（连接和适配器）被正确地设置在使用块的末端。无需创建单独的命令，因为适配器已经为SelectCommand定义了属性，您可以使用它来添加所需的参数。

另请注意，如果您以这种方式使用适配器，则无需打开/关闭连接。这是由填充调用内的适配器自动完成的。

在datagridview中显示ID与文本框值匹配的数据？

1 个答案: