更新CheckBoxListの値はGridViewの形式でデータベースに保存されます

Question

私は学生の情報を格納している学生用フォームを持っています。 Form Looks Like This

以下はコードです。どのようにここにCheckBoxListの

<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> 

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(); 
 
     }

を介して複数のチェックボックスを更新するにはStudentUpdate

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

のストアドプロシージャである。これは、私が最初の場所で、データベース内の被写体を格納していますどのように教えてください

protected void btnSave_Click(object sender, EventArgs e) 
 
     { 
 
      String gender; 
 
      if (rdBtnMale.Checked) 
 
       gender = rdBtnMale.Text; 
 
      else 
 
       gender = rdBtnFemale.Text; 
 

 
      string subject = ""; 
 
      if (cboxPhysics.Checked) 
 
      { 
 
       subject = cboxPhysics.Text; 
 
      } 
 
      if (cboxChemistry.Checked) 
 
      { 
 
       if (subject != "") 
 
       { subject = subject + ","; } 
 
       subject = subject + cboxChemistry.Text; 
 
      } 
 
      if (cboxBiology.Checked) 
 
      { 
 
       if (subject != "") 
 
       { subject = subject + ","; } 
 
       subject = subject + cboxBiology.Text; 
 
      }

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

Answer 1

あなたがループにCheckBoxListの中のすべてのListItemを持っています。あなたが今やっていることで、リストの中の最初にチェックされたアイテムだけが表示されます。すべてではありません。

//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

はこれを試してみてください：

.aspxのコード：

<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コード：

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：を追加することを忘れないでください。 OnRowDataBound GrindViewのイベント<asp:GridView ID="GridView1" runat="server" OnRowDataBound="GridView1_RowDataBound" >