Question

我想在网页上实现一个按钮，删除gridview上显示的所有数据。有没有更简单的方法可以使用按钮一次删除所有数据？

Answer 1

这很简单。只需遍历gridview中的每一行并获取主键值，然后使用sql查询从数据库中删除记录。这里的代码可以帮助您。我正在使用NorthWind示例数据库。

void loaddata()
    {
        SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["TestDatabaseConnectionString"].ConnectionString);
        SqlCommand command = new SqlCommand();
        connection.Open();
        try
        {
            command = connection.CreateCommand();
            command.CommandText = "SELECT * FROM Employees";
            SqlDataAdapter adapter = new SqlDataAdapter(command);
            DataTable datatable = new DataTable();
            adapter.Fill(datatable);
            GridView1.DataSource = datatable;
        }
        catch (Exception)
        {
            throw;
        }
        finally
        {
            if (connection.State == ConnectionState.Open)
            {
                connection.Close();
            }
        }
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        int employee_id;

        SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["TestDatabaseConnectionString"].ConnectionString);
        SqlCommand command = new SqlCommand();
        connection.Open();
        try
        {
            command = connection.CreateCommand();
            for (int i = 0; i < GridView1.Rows.Count; i++)
            {
                employee_id = Convert.ToInt32(GridView1.Rows[i].Cells[0].Text);
                command.CommandText = "DELETE FROM Employees WHERE EmployeeID = '" + employee_id + "'";
                command.ExecuteNonQuery();
            }
        }
        catch (Exception)
        {
            throw;
        }
        finally
        {
            if (connection.State == ConnectionState.Open)
            {
                connection.Close();
            }
        }

        loaddata();
    }

Answer 2

您始终可以将DataSource设置为null。

someGridView.DataSource = null;
someGridView.DataBind();

Answer 3

我只能像问题一样模糊，我仍然不太明白为什么我不能发表评论，但我可以留下答案......

无论如何，我们不知道您使用什么来访问数据库或支持GridView的模型。

比方说，您可以使用以下类支持GridView（GridView包含的数据类型，您已将数据源设置为）：

public class MyData
{
    public int ID { get; set; }
    public string SomeData { get; set; }
}

在您的ASPX中，您将拥有以下内容：

<asp:GridView ID="GridView" runat="server"></asp:GridView>
<asp:Button ID="DeleteButton" runat="server" OnClick="DeleteButton_Click"/>

然后在你的代码隐藏中，你会做这样的事情......

protected void DeleteButton_Click(object sender, EventArgs e)
{
    var gridViewItemsToDelete = (IEnumerable<MyData>)GridView.DataSource;

    foreach (var idToDelete in gridViewItemsToDelete.Select(r=>r.ID))
    {
        // Delete the item by its ID
        // I don't know what you're using to access your database
    }

    // Save Changes if you didn't in the foreach loop...
}

从gridview

3 个答案: