根据来自另一个 gridview 的检查值过滤 gridview

Question

我有两个 GridView。首先称为“gvImage”，它是带有复选框的类别gridview。第二个 GridView 称为“GridView1”，第二个 GridView 根据在第一个 GridView 中选择的值填充，在这里我只能为从第一个 GridView 中选中（选择）的一个类别填充第二个 GridView 中的记录，但是当我检查时（选择）从第一个 GridView（gvImage）中的多个类别，然后它不会填充第二个 GridView（GridView1）中的多个类别记录。请帮我搞定，下面是我的代码：

 protected void btn_Submit_Click(object sender, EventArgs e)
        {
            foreach (GridViewRow row in gvImage.Rows)
            {
                if (row.RowType == DataControlRowType.DataRow)
                {
                    bool isChecked = row.Cells[0].Controls.OfType<CheckBox>().FirstOrDefault().Checked;
                    if (isChecked)
                    {
                        String strConnString = ConfigurationManager.ConnectionStrings["CONNECTION1"].ConnectionString;
                        SqlConnection con = new SqlConnection(strConnString);
                        string str = "SELECT  * FROM AllProduct WHERE PId =@PId";
                        SqlCommand cmd = new SqlCommand(str, con);
                        cmd.Parameters.AddWithValue("@PId", row.Cells[1].Controls.OfType<TextBox>().FirstOrDefault().Text);
                        //this.ExecuteQuery(cmd, "SELECT");
                        DataSet objDs = new DataSet();
                        SqlDataAdapter dAdapter = new SqlDataAdapter();
                        dAdapter.SelectCommand = cmd;
                        con.Open();
                        dAdapter.Fill(objDs);
                        con.Close();
                        if (objDs.Tables[0].Rows.Count > 0)
                        {
                            cmd.CommandType = CommandType.Text;
                            using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
                            {
                                using (DataTable dt = new DataTable())
                                {
                                    sda.Fill(dt);
                                    GridView1.DataSource = dt;
                            GridView1.DataBind();
                            GridView1.Visible = true;
                            GridView1.Enabled = true;
                                }
                            }

                        }
                        else if (objDs.Tables[0].Rows.Count == 0)
                        {
                            GridView1.DataSource = null;
                            GridView1.Visible = false;
                        }

                    }
                }
            }
        }

Answer 1

问题是您为每个选中的复选框绑定了第二个网格，这基本上总是替换已绑定的数据，因此您只能看到最后选中的复选框的结果。需要合并结果并在foreach外绑定

protected void btn_Submit_Click(object sender, EventArgs e)
{
    DataTable combinedDataTable;
    foreach (GridViewRow row in gvImage.Rows)
    {
        if (row.RowType == DataControlRowType.DataRow)
        {
            bool isChecked = row.Cells[0].Controls.OfType<CheckBox>().FirstOrDefault().Checked;
            if (isChecked)
            {
                DataTable data = //Data from database for this checkbox
                if(combinedDataTable != null)
                    combinedDataTable.Merge(data);
                else
                    combinedDataTable = data;
            }
        }
    }
    GridView1.DataSource = combinedDataTable;
    GridView1.DataBind();
}

或者更好的是，只收集先选中哪些复选框，然后在一个查询中获取结果：

protected void btn_Submit_Click(object sender, EventArgs e)
{
    List<string> selectedCheckboxes = new List<string>()
    foreach (GridViewRow row in gvImage.Rows)
    {
        if (row.RowType == DataControlRowType.DataRow)
        {   
            bool isChecked = row.Cells[0].Controls.OfType<CheckBox>().FirstOrDefault().Checked;
            if (isChecked)
            {
                selectedCheckboxes.Add(row.Cells[1].Controls.OfType<TextBox>().FirstOrDefault().Text);
            }
        }
    }

    String strConnString = ConfigurationManager.ConnectionStrings["CONNECTION1"].ConnectionString;
    SqlConnection con = new SqlConnection(strConnString);
    string str = "SELECT  * FROM AllProduct WHERE PId in ";
    SqlCommand cmd = new SqlCommand();
    cmd.Connection = con;
    List<string> parametersNames = new List<string>();
    for (int i = 0; i < selectedCheckboxes.Count; i++)
    {
        var parameterName = "@PId" + i;
        cmd.Parameters.AddWithValue(parameterName, selectedCheckboxes[i]);
        parametersNames.Add(parameterName);
    }
    str += "(" + String.Join(",", parametersNames) + ")";
    str += " AND TransactionDate BETWEEN @From AND @To";
    cmd.Parameters.AddWithValue("@From", DateTime.Parse(txtFrom.Text));
    cmd.Parameters.AddWithValue("@To", DateTime.Parse(txtTo.Text));
    cmd.CommandText = str;
    DataSet objDs = new DataSet();
    SqlDataAdapter dAdapter = new SqlDataAdapter();
    dAdapter.SelectCommand = cmd;
    con.Open();
    dAdapter.Fill(objDs);
    con.Close();
    if (objDs.Tables[0].Rows.Count > 0)
    {
        cmd.CommandType = CommandType.Text;
        using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
        {
            using (DataTable dt = new DataTable())
            {
                sda.Fill(dt);
                GridView1.DataSource = dt;
                GridView1.DataBind();
                GridView1.Visible = true;
                GridView1.Enabled = true;
            }
        }

    }
    else if (objDs.Tables[0].Rows.Count == 0)
    {
        GridView1.DataSource = null;
        GridView1.Visible = false;
    }
}