Question

我有一个学生表格，存储学生的信息。 Form Looks Like This

以下是代码。请告诉我如何通过Checkboxlist更新多个复选框

let button = UIButton(frame: CGRect(x: 0, y: 0, width: 30, height: 30))
button.setImage(UIImage(named: "ur_image.png"), for: .normal)
self.navigationItem.titleView = button

<EditItemTemplate>
    <asp:CheckBoxList ID="CheckBoxList1" runat="server" RepeatDirection="Horizontal" SelectedValue='<%# Eval("SUbjects") %>'>
        <%--OnSelectedIndexChanged="CheckBoxList1_SelectedIndexChanged--%>
        <asp:ListItem Value="Physics">Physics</asp:ListItem>
        <asp:ListItem Value="Chemistry">Chemistry</asp:ListItem>
        <asp:ListItem Value="Biology">Biology</asp:ListItem>
    </asp:CheckBoxList>
</EditItemTemplate>
<ItemTemplate>
    <asp:Label ID="Label6" runat="server" onCheckedChanged="onChackedChange" Text='<%# Eval("SUbjects") %>'></asp:Label>
</ItemTemplate>

这是StudentUpdate的存储过程

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
             
            int studentid = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value.ToString());//Get Each Row unique value from DataKeyNames
            string studentname = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("TextBox1")).Text;//get TextBox Value in EditItemTemplet that row is clicked
            string studentage = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("TextBox2")).Text;
            string studentdepartment = ((DropDownList)GridView1.Rows[e.RowIndex].FindControl("DropDownList1")).Text;
            string studentgender = ((RadioButtonList)GridView1.Rows[e.RowIndex].FindControl("RadioButtonList1")).Text;
            CheckBoxList studentsubjects = ((CheckBoxList)GridView1.Rows[e.RowIndex].FindControl("CheckBoxList1"));

  
            SqlConnection conn = new SqlConnection("Data Source=WINCTRL-0938L38; Database=dbUni; Integrated Security=true");
            conn.Open();
            SqlCommand cmd = new SqlCommand("StudentUpdate", conn);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@student_id ", studentid);
            cmd.Parameters.AddWithValue("@name ", studentname);
            cmd.Parameters.AddWithValue("@age ", int.Parse(studentage));
            cmd.Parameters.AddWithValue("@department ", studentdepartment);
            cmd.Parameters.AddWithValue("@gender ", studentgender);
            cmd.Parameters.AddWithValue("@subjects ", studentsubjects);
            }
            
           
            cmd.ExecuteNonQuery();
            GridView1.EditIndex = -1;// no row in edit mode
            FillGrid();
            conn.Close();
        }

这就是我在First Place中将主题存储在数据库中的方法

 CREATE PROCEDURE [dbo].[StudentUpdate]
    (
    @student_id int,
    @name varchar(50),
    @age int,
    @gender nvarchar(50),
    @department nvarchar(50),
    @subjects nvarchar(50)
    )
    AS UPDATE tblStudents set
    NAME=@name,
    AGE=@age,
    DEPARTMENT=@department,
    GENDER=@gender,
    SUbjects=@subjects
    where Student_ID=@student_id

In This Image I have applied changes but I am having this warning.

Answer 1

您必须在CheckBoxList中循环所有ListItem。根据您现在所做的事情，您只获得列表中的第一个已检查项目，而不是所有项目。

//create a list to store all the subjects
List<string> studentsubjects = new List<string>();

//find the control in the GridView and cast it back to a CheckBoxList
CheckBoxList subjects = GridView1.Rows[e.RowIndex].FindControl("CheckBoxList1") as CheckBoxList;

//loop all the items and see if they are checked
foreach (ListItem item in subjects.Items)
{
    if (item.Selected)
    {
        //add the checked value to the list
        studentsubjects.Add(item.Text);
    }
}

//display results
Label1.Text = string.Join(",", studentsubjects);

Answer 2

试试这个：

.Aspx代码：

<EditItemTemplate>
    <asp:Label ID="Label1" Visible="false" runat="server" Text='<%# Eval("SUbjects") %>'></asp:Label>
    <asp:CheckBoxList ID="CheckBoxList1" runat="server" SelectMethod="Multi" RepeatDirection="Horizontal" SelectedValue='<%# Eval("SUbjects") %>'>
        <%--OnSelectedIndexChanged="CheckBoxList1_SelectedIndexChanged--%>
        <asp:ListItem Value="Physics">Physics</asp:ListItem>
        <asp:ListItem Value="Chemistry">Chemistry</asp:ListItem>
        <asp:ListItem Value="Biology">Biology</asp:ListItem>
    </asp:CheckBoxList>
</EditItemTemplate>
<ItemTemplate>
    <asp:Label ID="Label6" runat="server" onCheckedChanged="onChackedChange" Text='<%# Eval("SUbjects") %>'></asp:Label>
</ItemTemplate>

.CS代码：

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow || (e.Row.RowState & DataControlRowState.Edit) > 0)
        {
            CheckBoxList chklist = ((CheckBoxList)e.Row.FindControl("CheckBoxList1"));
            string subjects = ((Label)e.Row.FindControl("Label1")).Text;

            string[] subjectslist = subjects.Split(',');

            foreach (string item in subjectslist)
            {
                if (item == "Physics")
                    chklist.Items.FindByText("Physics").Selected = true;
                else if (item == "Chemistry")
                    chklist.Items.FindByText("Chemistry").Selected = true;
                else
                    chklist.Items.FindByText("Biology").Selected = true;
            }
        }
    }

注意：不要忘记在GrindView OnRowDataBound

中添加<asp:GridView ID="GridView1" runat="server" OnRowDataBound="GridView1_RowDataBound" >事件

从GridView更新CheckBoxList值并保存到数据库中

2 个答案: