C# - 计算选中的复选框不起作用

Question

所以首先我从数据库中获取所有内容并为每一行新数据添加一个复选框，这一切正常：

while (reader.Read()) {
                    idtema = "";
                    nome = "";
                    filename[i] = "";

                    TableRow rows = new TableRow();
                    TableCell cell1 = new TableCell();
                    TableCell cell2 = new TableCell();
                    TableCell cell3 = new TableCell();
                    TableCell cell4 = new TableCell();
                    CheckBox ch = new CheckBox();

                    idtema = reader["IDTema"].ToString();
                    nome = reader["NomeArtista"].ToString();
                    filename[i] = reader["FileNameTrabalho"].ToString();

                    cell1.Text = idtema;
                    cell2.Text = nome;
                    cell3.Text = string.Format("<a href='/Tema" + idtema + "/" + filename[i] + "' data-lightbox='images1'><img height='100%' src = '/Tema" + idtema + "/" + filename[i] + "'>");
                    cell4.Controls.Add(ch);

                    rows.Cells.Add(cell1);
                    rows.Cells.Add(cell2);
                    rows.Cells.Add(cell3);
                    rows.Cells.Add(cell4);

                    TabelaPrincipal.Rows.Add(rows);
                    Button1.Visible = true;
                    i = i + 1;
                }
                con.Close();

在此之后，我去表格并检查所有复选框 (4)，然后按下按钮读取数据：

public void Button1_Click(object sender, EventArgs e)
    {
        int check = 0;

        foreach (Control item in this.TabelaPrincipal.Controls)
        {
            if((item is CheckBox) && ((CheckBox) item).Checked)
            {
                TabelaPrincipal.Visible = false;
                Button1.Visible = false;
                DropArtista.Visible = false;
                DropEscola.Visible = false;
                DropConcelho.Visible = false;

                check += 1;
                Response.Write(check);
            }
            else
            {

            }
        }
    }

if 不起作用，它转到“else”，仅此而已（甚至不检查它是否被选中），我该如何更改才能读取我所有的复选框和列？

Answer 1

尝试这样做：

public void Button1_Click(object sender, EventArgs e)   {
    int check = 0;

    foreach (TableRow row in this.TabelaPrincipal.Rows) {
        foreach (TableCell cell in row.Cells) {
            foreach (Control item in cell.Controls) {
                    if((item is CheckBox) && ((CheckBox) item).Checked)
                    {
                        TabelaPrincipal.Visible = false;
                        Button1.Visible = false;
                        DropArtista.Visible = false;
                        DropEscola.Visible = false;
                        DropConcelho.Visible = false;

                        check += 1;
                        //Response.Write(check);
                    }
                    else
                    {

                    }
                }
        }
    }
    Response.Write(check);
}

如果这不起作用，请尝试做这样的事情（这两种解决方案都适用于我）：

public void Button1_Click(object sender, EventArgs e)
{
     int check = 0;
     foreach (Control control in TabelaPrincipal.Controls)
     {
         check = SearchControl(control, check);
     }

     //Here Check is OK (It has the number of the checkboxes that are checked in the interface)
     Response.Write(check);
}


public int SearchControl(Control control, int check)
    {

        if (control != null && control.Controls !=null && control.Controls.Count > 0)
        {
            foreach (Control c in control.Controls)
            {
                check = SearchControl(c, check);
            }                
        }
        else
        {
            if ((control is CheckBox) && ((CheckBox)control).Checked)
            {
                check += 1;
            }
        }



        return check;

    }

还有一些其他的解决方案，但您需要使用一些 JavaScript、JQuery 和 Ajax。这可能会大大改变您的设计（特别是，我不再使用 asp.net，只使用带有 JQuery、JS、Bootstrap 和 Ajax 请求的 HTML 来调用服务器端方法）。