在ASP.NET應用程序中從gridview刪除記錄

Question

我在頁面上具有以下gridview，以顯示具有“審閱者”角色的用戶。 網格正確提取記錄。 在gridview上是一個“刪除”按鈕，用於刪除Reviewer角色。 手動運行時，被調用的存儲過程正常工作，但是我似乎在aspx或codebehind頁面上缺少某些內容，因為沒有錯誤返回，也沒有刪除任何記錄。

gridview的aspx控件：

 <asp:GridView ID="GridView1" runat="server" Caption="Current Reviewers" AllowSorting="True" PagerSettings-Mode="NumericFirstLast" OnPageIndexChanging="GridView1_PageIndexChanging"
CaptionAlign="Top" EmptyDataText="No Reviewers Configured." PageSize="10" AllowPaging="true" PagerStyle-HorizontalAlign="Center" PagerStyle-Font-Size="Large"
AutoGenerateColumns="false" AlternatingRowStyle-BackColor="#cccccc" DataKeyNames="UserId" OnRowDeleting="DeleteRecord">
<Columns>

     <asp:BoundField DataField="UserId" HeaderText="Id" ItemStyle-Width="300" />
    <asp:BoundField DataField="Name" HeaderText="Name" ItemStyle-Width="250" />
    <asp:TemplateField HeaderText="Delete?">
                    <ItemTemplate>
                        <span onclick="return confirm('Are you sure to Delete the record?')">
                            <asp:LinkButton ID="lnkB" runat="Server" Text="Delete" CommandArgument='<%# Eval("UserId") %>' CommandName="DeleteRecord"></asp:LinkButton>
                        </span>
                    </ItemTemplate>
                </asp:TemplateField>
</Columns>

</asp:GridView>

更新后帶有完整代碼：

namespace cs1.Admin
{
public partial class ReviewerMaintenance : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindDropDownList1();
        }
    }
    private void BindDropDownList1()
    {

        string connectionString = WebConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
        string selectSQL = String.Format("SELECT Id as UserId, FirstName + ' ' + LastName As Name from AspNetUsers where Id in(SELECT  UserId from AspNetUserRoles where RoleId = 1)");
        SqlConnection con = new SqlConnection(connectionString);
        SqlCommand cmd = new SqlCommand(selectSQL, con);
        SqlDataAdapter adapter = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();

        adapter.Fill(ds, "Reviewer");

        GridView1.DataSource = ds;
        GridView1.DataBind();
    }
    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        GridView1.PageIndex = e.NewPageIndex;
        BindDropDownList1(); //bindgridview will get the data source and bind it again
    }

    protected void DeleteRecord(object sender, GridViewDeleteEventArgs e)
    {
        string UserId = GridView1.DataKeys[e.RowIndex].Value.ToString();
        SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString());
        SqlCommand dCmd = new SqlCommand();
        {
            conn.Open();
            dCmd.CommandText = "Reviewer_Delete";
            dCmd.CommandType = CommandType.StoredProcedure;
            dCmd.Parameters.Add("@UserId", SqlDbType.NVarChar).Value = UserId;
            dCmd.Connection = conn;
            dCmd.ExecuteNonQuery();
            // Refresh the data

            BindDropDownList1();
            dCmd.Dispose();
            conn.Close();
            conn.Dispose();

        }

    }


}
}

Answer 1

嘗試使用GridView的OnRowCommand事件來處理此問題。

在您的Gridview標記中 ：

確保存在OnRowCommand="GridView1_RowCommand" 。

在后面的代碼中 ：

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    { /* Set a breakpoint here and make sure: 
           A.) You are hitting this method 
           B.) Get value of e.CommandName */
        if (e.CommandName == "EditRecord")
        {
            // Run your edit/update logic here if needed
        }
        if (e.CommandName == "DeleteRecord")
        {
            // Delete the record here
            string UserId = GridView1.DataKeys[e.RowIndex].Value.ToString();
            SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString());
            SqlCommand dCmd = new SqlCommand();
            {
                conn.Open();
                dCmd.CommandText = "Reviewer_Delete";
                dCmd.CommandType = CommandType.StoredProcedure;
                dCmd.Parameters.Add("@UserId", SqlDbType.NVarChar).Value = UserId;
                dCmd.Connection = conn;
                dCmd.ExecuteNonQuery();
                // Refresh the data

                BindDropDownList1();
                dCmd.Dispose();
                conn.Close();
                conn.Dispose();
        }
    }

Answer 2

最終這是一件非常簡單的事情。 在aspx頁面上，我將OnRowDeleting和CommandName元素都設置為相同的“ DeleteRecord”值。

將CommandName值更改為“ Delete”可以評估代碼並成功調用存儲過程。